yaob - npm Package Compare versions

Comparing version 0.3.5 to 0.3.6

CHANGELOG.md

 # Changelog
 
+## 0.3.6 (2020-01-02)
+
+- Add TypeScript type definitions.
+- Add `ArrayBuffer` support.
+
 ## 0.3.5 (2019-11-23)
@@ -4,0 +9,0 @@

lib/yaob.cjs.js

@@ -196,2 +196,3 @@ 'use strict';
         if (data instanceof Error) return 'e';
+        if (data instanceof ArrayBuffer) return 'ab';
         if (data instanceof Uint8Array) return 'u8';
@@ -300,2 +301,5 @@
 
+    case 'ab':
+      return rfc4648.base64.stringify(new Uint8Array(data));
+
     case 'u8':
@@ -410,2 +414,9 @@ return rfc4648.base64.stringify(data);
 
+    case 'ab':
+      if (typeof raw !== 'string') {
+        throw new TypeError("Expecting a base64 string at " + path);
+      }
+
+      return rfc4648.base64.parse(raw).buffer;
+
     case 'u8':
@@ -412,0 +423,0 @@ if (typeof raw !== 'string') {

lib/yaob.cjs.js.map

@@ -1,1 +0,1 @@
-{"version":3,"file":"yaob.cjs.js","sources":["../src/magic.js","../src/data.js","../src/manage.js","../src/objects.js","../src/state.js","../src/bridge.js","../src/bridgeable.js"],"sourcesContent":["// @flow\n/**\n * @file\n * Bridgeable objects have a special \"magic\" property.\n * This file contains routines for working with these magic properties.\n */\n\nimport type { BridgeState } from './state.js'\n\n// An object is bridgeable if it has this key:\nexport const MAGIC_KEY = '_yaob'\n\n/**\n * Magic data used to mark classes as bridgeable.\n */\nexport type ClassMagic = {}\n\n/**\n * Magic data shared by all object instances.\n */\ntype ObjectMagic = {\n  // The object id on this side of the bridge:\n  +localId: number,\n\n  // The object is no longer bridgeable when set:\n  closed?: true,\n\n  // Bridges subscribed to this object:\n  bridges: Array<BridgeState>,\n\n  // Event listeners subscribed to this object:\n  listeners: { [name: string]: Array<Function> },\n\n  // Property watchers subscribed to this object:\n  watchers: { [name: string]: { data: mixed, fs: Array<Function> } }\n}\n\n/**\n * Magic data found on user-facing object instances.\n */\nexport type InstanceMagic = ObjectMagic & {\n  // This is a proxy object if set. See ProxyMagic for other properties:\n  +remoteId?: number\n}\n\n/**\n * Magic data found on proxy objects.\n */\nexport type ProxyMagic = ObjectMagic & {\n  +remoteId: number,\n\n  // True if the property getter should throw the value:\n  +errors: { [name: string]: boolean },\n\n  // Values for property getters to return:\n  +props: { [name: string]: mixed }\n}\n\n/**\n * Magic data found on shared props.\n */\nexport type SharedMagic = {\n  +shareId: string\n}\n\nlet nextLocalId = 1\nexport const sharedData: { [sharedId: string]: mixed } = {}\n\n/**\n * Adds or updates an object's magic data.\n */\nfunction addMagic(o: Object, magic: ClassMagic | ObjectMagic | SharedMagic) {\n  if (Object.prototype.hasOwnProperty.call(o, MAGIC_KEY)) {\n    Object.assign(o[MAGIC_KEY], magic)\n  } else {\n    Object.defineProperty(o, MAGIC_KEY, { value: magic })\n  }\n}\n\n/**\n * Makes a class bridgeable, including anything derived from it.\n */\nexport function bridgifyClass<Type: Function>(Class: Type): Type {\n  const o = Class.prototype\n  if (!Object.prototype.hasOwnProperty.call(o, MAGIC_KEY)) {\n    const magic: ClassMagic = {}\n    addMagic(o, magic)\n  }\n  return Class\n}\n\n/**\n * Makes an object instance bridgeable.\n */\nexport function bridgifyObject<Type: Object>(o: Type): Type {\n  if (\n    !Object.prototype.hasOwnProperty.call(o, MAGIC_KEY) ||\n    o[MAGIC_KEY].localId == null\n  ) {\n    const magic: InstanceMagic = {\n      localId: nextLocalId++,\n      bridges: [],\n      listeners: {},\n      watchers: {}\n    }\n    addMagic(o, magic)\n  }\n  return o\n}\n\n/**\n * Gets the magic data from an object instance.\n */\nexport function getInstanceMagic(o: Object): InstanceMagic {\n  // We only want to look at bridgeable objects:\n  if (o[MAGIC_KEY] == null) throw new TypeError('Not a bridgeable object')\n\n  bridgifyObject(o)\n  return o[MAGIC_KEY]\n}\n\n/**\n * Creates a new `ProxyMagic` object.\n */\nexport function makeProxyMagic(remoteId: number): ProxyMagic {\n  return {\n    // InstanceMagic:\n    localId: nextLocalId++,\n    bridges: [],\n    listeners: {},\n    watchers: {},\n    // ProxyMagic:\n    remoteId,\n    errors: {},\n    props: {}\n  }\n}\n\n/**\n * Adds items to the global shared data table.\n */\nexport function shareData(\n  table: { [name: string]: Object },\n  namespace?: string\n) {\n  if (namespace == null) namespace = ''\n  else namespace += '.'\n\n  for (const n of Object.getOwnPropertyNames(table)) {\n    const shareId = namespace + n\n    if (sharedData[shareId] != null) {\n      throw new Error(`A shared value named ${shareId} already exists`)\n    }\n    sharedData[shareId] = table[n]\n    addMagic(table[n], { shareId })\n  }\n}\n","// @flow\n/**\n * @file\n * Routines for breaking primitive values into messages,\n * and then restoring those messages into values on the other side.\n */\n\nimport { base64 } from 'rfc4648'\n\nimport { MAGIC_KEY, sharedData } from './magic.js'\n\n/**\n * The data-packing system uses this interface to turn\n * bridgeable objects into packedId's and vice-versa.\n */\nexport interface ObjectTable {\n  getPackedId(o: Object): number | null;\n  getObject(packedId: number): Object | void;\n}\n\n/**\n * The bridge tries to send values as-is, but that isn't always possible.\n * If this data structure is non-null, the strings indicate what changes\n * need to take place to the value. This data structure is recursive,\n * so it matches the \"shape\" of the value.\n */\nexport type DataMap =\n  | { +[name: string]: DataMap }\n  | Array<DataMap>\n  | '' // No change\n  | '?' // Invalid value\n  | 'd' // Date\n  | 'e' // Error\n  | 'o' // Object\n  | 's' // Shared data\n  | 'u' // Undefined\n  | 'u8' // Uint8Array\n\n/**\n * A pure JSON value type.\n */\nexport type JsonValue =\n  | { +[name: string]: JsonValue }\n  | Array<JsonValue>\n  | false\n  | null\n  | number\n  | string\n  | true\n\n/**\n * A value for sending over the wire.\n * If the `value` needs to be modified on the client side,\n * those modifications are in the `map` structure.\n * If this value was thrown, `throw` will be true.\n */\nexport type PackedData = {\n  +map?: DataMap,\n  +raw: JsonValue,\n  +throw?: true\n}\n\n/**\n * The bridge turns errors into these objects.\n */\nexport type PackedError = {\n  +base: string | null\n} & PackedData // Object properties\n\n/**\n * Prepares a value for sending over the wire.\n */\nexport function packData(table: ObjectTable, data: mixed): PackedData {\n  try {\n    const map = mapData(table, data)\n    const raw = packItem(table, map, data)\n    return map !== '' ? { map, raw } : { raw }\n  } catch (data) {\n    return packThrow(table, data)\n  }\n}\n\n/**\n * Prepares a thrown value for sending over the wire.\n */\nexport function packThrow(table: ObjectTable, data: mixed): PackedData {\n  const map = mapData(table, data)\n  const raw = packItem(table, map, data)\n  return { map, raw, throw: true }\n}\n\n/**\n * Restores a value that has been sent over the wire.\n */\nexport function unpackData(\n  table: ObjectTable,\n  data: PackedData,\n  path: string\n): any {\n  const { map, raw } = data\n  const out = map != null ? unpackItem(table, map, raw, path) : raw\n  if (data.throw) throw out\n  return out\n}\n\n/**\n * Searches through a value, looking for data we can't send directly.\n * Returns a map showing where fixes need to take place.\n */\nfunction mapData(table: ObjectTable, data: mixed): DataMap {\n  switch (typeof data) {\n    case 'boolean':\n    case 'number':\n    case 'string':\n      return ''\n\n    case 'object': {\n      if (data === null) return ''\n      if (data instanceof Date) return 'd'\n      if (data instanceof Error) return 'e'\n      if (data instanceof Uint8Array) return 'u8'\n      if (data[MAGIC_KEY] != null) {\n        return data[MAGIC_KEY].shareId != null ? 's' : 'o'\n      }\n\n      // Arrays:\n      if (Array.isArray(data)) {\n        let out: Array<DataMap> | '' = ''\n        for (let i = 0; i < data.length; ++i) {\n          const map = mapData(table, data[i])\n          if (map !== '' && out === '') {\n            out = []\n            for (let j = 0; j < i; ++j) out[j] = ''\n          }\n          if (out !== '') out[i] = map\n        }\n        return out\n      }\n\n      // Data objects:\n      let out: { [name: string]: DataMap } | '' = ''\n      for (const n in data) {\n        const map = mapData(table, data[n])\n        if (map !== '') {\n          if (out === '') out = {}\n          out[n] = map\n        }\n      }\n      return out\n    }\n\n    case 'undefined':\n      return 'u'\n\n    case 'function':\n      // $FlowFixMe - MAGIC_KEY isn't a known property here\n      return data[MAGIC_KEY] != null && data[MAGIC_KEY].shareId != null\n        ? 's'\n        : '?'\n\n    default:\n      return '?'\n  }\n}\n\n/**\n * Breaks down an error object into a JSON representation.\n */\nfunction packError(table: ObjectTable, o: Object): PackedError {\n  // Grab the properties off the object:\n  const { message, stack } = o\n  const props = { message, stack, ...o }\n\n  let base = null\n  if (o instanceof EvalError) base = 'EvalError'\n  else if (o instanceof RangeError) base = 'RangeError'\n  else if (o instanceof ReferenceError) base = 'ReferenceError'\n  else if (o instanceof SyntaxError) base = 'SyntaxError'\n  else if (o instanceof TypeError) base = 'TypeError'\n  else if (o instanceof URIError) base = 'URIError'\n\n  // Build the JSON value:\n  return { base, ...packData(table, props) }\n}\n\n/**\n * Copies a value, removing any API objects identified in the types.\n */\nfunction packItem(table: ObjectTable, map: DataMap, data: any): JsonValue {\n  switch (map) {\n    case '':\n      return data\n\n    case '?':\n      return typeof data\n\n    case 'd':\n      return data.toISOString()\n\n    case 'e':\n      return packError(table, data)\n\n    case 'o':\n      return table.getPackedId(data)\n\n    case 's':\n      return data[MAGIC_KEY].shareId\n\n    case 'u':\n      return null\n\n    case 'u8':\n      return base64.stringify(data)\n\n    default: {\n      // Arrays:\n      if (Array.isArray(map)) {\n        const out = []\n        for (let i = 0; i < map.length; ++i) {\n          out[i] = packItem(table, map[i], data[i])\n        }\n        return out\n      }\n\n      // Objects:\n      const out = {}\n      for (const n in data) {\n        out[n] = n in map ? packItem(table, map[n], data[n]) : data[n]\n      }\n      return out\n    }\n  }\n}\n\n/**\n * Restores an error object from its JSON representation.\n */\nfunction unpackError(\n  table: ObjectTable,\n  value: PackedError,\n  path: string\n): Error {\n  const bases = {\n    EvalError,\n    RangeError,\n    ReferenceError,\n    SyntaxError,\n    TypeError,\n    URIError\n  }\n\n  // Make the object:\n  const Base = value.base != null ? bases[value.base] || Error : Error\n  const out: Object = new Base()\n\n  // Restore the properties:\n  const props = unpackData(table, value, path)\n  for (const n in props) out[n] = props[n]\n\n  return out\n}\n\n/**\n * Restores a value that has been sent over the wire.\n */\nfunction unpackItem(\n  table: ObjectTable,\n  map: DataMap,\n  raw: any,\n  path: string\n): any {\n  switch (map) {\n    case '':\n      return raw\n\n    case '?': {\n      const type = typeof raw === 'string' ? raw : '?'\n      throw new TypeError(`Unsupported value of type ${type} at ${path}`)\n    }\n\n    case 'd':\n      return new Date(raw)\n\n    case 'e':\n      if (typeof raw !== 'object' || raw === null) {\n        throw new TypeError(`Expecting an error description at ${path}`)\n      }\n      return unpackError(table, raw, path)\n\n    case 'o': {\n      if (raw === null) {\n        throw new TypeError(`Closed bridge object at ${path}`)\n      }\n      if (typeof raw !== 'number') {\n        throw new TypeError(`Expecting a packedId at ${path}`)\n      }\n      const o = table.getObject(-raw)\n      if (o == null) throw new RangeError(`Invalid packedId ${raw} at ${path}`)\n      return o\n    }\n\n    case 's': {\n      if (typeof raw !== 'string') {\n        throw new TypeError(`Expecting a shareId at ${path}`)\n      }\n      const s = sharedData[raw]\n      if (s == null) throw new RangeError(`Invalid shareId '${raw}' at ${path}`)\n      return s\n    }\n\n    case 'u':\n      return undefined\n\n    case 'u8':\n      if (typeof raw !== 'string') {\n        throw new TypeError(`Expecting a base64 string at ${path}`)\n      }\n      return base64.parse(raw)\n\n    default: {\n      if (typeof map !== 'object' || map === null) {\n        throw new TypeError(`Invalid type information ${map} at ${path}`)\n      }\n      if (typeof raw !== 'object' || raw === null) {\n        throw new TypeError(`Expecting an array or object at ${path}`)\n      }\n\n      // Arrays:\n      if (Array.isArray(map)) {\n        if (!Array.isArray(raw)) {\n          throw new TypeError(`Expecting an array at ${path}`)\n        }\n        const out = []\n        for (let i = 0; i < map.length; ++i) {\n          out[i] = unpackItem(table, map[i], raw[i], `${path}[${i}]`)\n        }\n        return out\n      }\n\n      // Objects:\n      const out = {}\n      for (const n in raw) {\n        out[n] =\n          n in map ? unpackItem(table, map[n], raw[n], `${path}.${n}`) : raw[n]\n      }\n      return out\n    }\n  }\n}\n","// @flow\n/**\n * @file\n * Functions for managing updates, events, and object lifetime.\n */\n\nimport { getInstanceMagic } from './magic.js'\n\n/**\n * Undoes the effect of `on`.\n */\nexport type CallbackRemover = () => mixed\n\n/**\n * Signature of the `on` method.\n */\nexport type Subscriber<Events: {} = {}> = <Name: $Keys<Events>>(\n  name: Name,\n  f: (v: $ElementType<Events, Name>) => mixed\n) => CallbackRemover\n\n// No user-supplied value will ever be identical to this.\nexport const dirtyValue = {}\n\n/**\n * Subscribes to an event on a bridgeable object.\n */\nexport function addListener(\n  o: Object,\n  name: string,\n  f: Function\n): CallbackRemover {\n  const { closed, listeners } = getInstanceMagic(o)\n\n  if (closed) return () => {}\n  if (listeners[name] == null) listeners[name] = [f]\n  else listeners[name].push(f)\n\n  return function unsubscribe() {\n    listeners[name] = listeners[name].filter(i => i !== f)\n  }\n}\n\n/**\n * Subscribes to property changes on a bridgeable object.\n */\nexport function addWatcher(\n  o: Object,\n  name: string,\n  f: Function\n): CallbackRemover {\n  const { closed, watchers } = getInstanceMagic(o)\n\n  // Don't catch access errors, since we want the user to see them:\n  const data = o[name]\n\n  if (closed) return () => {}\n  if (watchers[name] == null) watchers[name] = { data, fs: [f] }\n  else watchers[name].fs.push(f)\n\n  return function unsubscribe() {\n    watchers[name].fs = watchers[name].fs.filter(i => i !== f)\n  }\n}\n\n/**\n * Destroys a proxy.\n * The remote client will completely forget about this object,\n * and accessing it will become an error.\n */\nexport function close(o: Object): mixed {\n  const magic = getInstanceMagic(o)\n\n  // Call local callbacks:\n  const listeners = magic.listeners.close\n  if (listeners != null) {\n    for (const f of listeners) {\n      callCallback(o, f, undefined, true)\n    }\n  }\n\n  magic.closed = true\n  for (const bridge of magic.bridges) {\n    bridge.emitClose(magic.localId)\n  }\n  magic.bridges = []\n  magic.listeners = {}\n  magic.watchers = {}\n}\n\n/**\n * Emits an event on a bridgeable object.\n */\nexport function emit(o: Object, name: string, payload: mixed): mixed {\n  const magic = getInstanceMagic(o)\n  if (magic.closed) throw new Error('Cannot emit event on closed object')\n\n  // Schedule outgoing event messages:\n  for (const bridge of magic.bridges) {\n    bridge.emitEvent(magic.localId, name, payload)\n  }\n\n  // Call local callbacks:\n  const listeners = magic.listeners[name]\n  if (listeners != null) {\n    for (const f of listeners) {\n      callCallback(o, f, payload, name !== 'error')\n    }\n  }\n}\n\n/**\n * Marks an object as having changes. The proxy server will send an update.\n */\nexport function update<T: {}>(o: T, name?: $Keys<T>): mixed {\n  const magic = getInstanceMagic(o)\n  if (magic.closed) throw new Error('Cannot update closed object')\n\n  for (const bridge of magic.bridges) {\n    bridge.markDirty(magic.localId, name)\n  }\n\n  // Blow away the cache if we have a name:\n  if (name != null && magic.watchers[name] != null) {\n    magic.watchers[name].data = dirtyValue\n  }\n\n  // Call watcher callbacks:\n  for (const n in magic.watchers) {\n    const cache = magic.watchers[n]\n    try {\n      const data = o[n]\n      if (data !== cache.data) {\n        cache.data = data\n        for (const f of cache.fs) callCallback(o, f, cache.data, true)\n      }\n    } catch (e) {}\n  }\n}\n\n/**\n * Calls a user-supplied callback function with error checking.\n */\nexport function callCallback(\n  o: Object,\n  f: Function,\n  payload: mixed,\n  emitError: boolean\n) {\n  try {\n    const out = f(payload)\n\n    // If the function returns a promise, emit an error if it rejects:\n    if (emitError && out != null && typeof out.then === 'function') {\n      out.then(undefined, e => emit(o, 'error', e))\n    }\n  } catch (e) {\n    if (emitError) emit(o, 'error', e)\n  }\n}\n","// @flow\n/**\n * @file\n * Routines for breaking bridgeable objects into messages,\n * and then restoring those messages into proxies on the other side.\n */\n\nimport { packData, packThrow, unpackData } from './data.js'\nimport {\n  type ProxyMagic,\n  getInstanceMagic,\n  MAGIC_KEY,\n  makeProxyMagic\n} from './magic.js'\nimport type { CreateMessage, PackedProps } from './protocol.js'\nimport type { BridgeState } from './state.js'\n\nexport type ValueCache = { [name: string]: mixed }\n\n// No user-supplied value will ever be identical to this.\nexport const dirtyValue = {}\n\n/**\n * Examines a bridgeable object and prepares it for sending of the wire.\n * Returns a creation method an the initial value cache.\n */\nexport function packObject(\n  state: BridgeState,\n  o: Object\n): {\n  cache: ValueCache,\n  create: CreateMessage\n} {\n  // Iterate the prototype chain, looking for property names:\n  const allNames: { [name: string]: true } = {}\n  const end = Object.prototype\n  for (let p = o; p !== end && p != null; p = Object.getPrototypeOf(p)) {\n    for (const name of Object.getOwnPropertyNames(p)) {\n      if (name !== MAGIC_KEY && !/^_/.test(name) && name !== 'constructor') {\n        allNames[name] = true\n      }\n    }\n  }\n\n  // Iterate over the object's properties and add their names to\n  // the method list or the value cache.\n  const cache: ValueCache = {}\n  const methods: Array<string> = []\n  const props: PackedProps = {}\n  for (const n in allNames) {\n    try {\n      const data = o[n]\n      if (\n        typeof data === 'function' &&\n        (data[MAGIC_KEY] == null || data[MAGIC_KEY].shareId == null)\n      ) {\n        methods.push(n)\n      } else {\n        cache[n] = data\n        props[n] = packData(state, data)\n      }\n    } catch (e) {\n      cache[n] = dirtyValue\n      props[n] = packThrow(state, e)\n    }\n  }\n\n  const { localId } = getInstanceMagic(o)\n  const create: CreateMessage = { localId, methods, props }\n  return { cache, create }\n}\n\n/**\n * Checks an object for changes.\n * Updates the cache, and returns an object with the necessary changes.\n */\nexport function diffObject(\n  state: BridgeState,\n  o: Object,\n  cache: ValueCache\n): { dirty: boolean, props: PackedProps } {\n  let dirty = false\n  const props: PackedProps = {}\n\n  for (const n in cache) {\n    try {\n      const value = o[n]\n      if (value !== cache[n]) {\n        dirty = true\n        props[n] = packData(state, value)\n        cache[n] = value\n      }\n    } catch (e) {\n      props[n] = packThrow(state, e)\n      cache[n] = dirtyValue\n    }\n  }\n\n  return { dirty, props }\n}\n\n/**\n * Creates an object proxy.\n * The object will have the same values and methods as the original,\n * but will send everything over the bridge.\n */\nexport function makeProxy(state: BridgeState, create: CreateMessage): Object {\n  const props = {}\n\n  // Make the magic property descriptor:\n  const magic = makeProxyMagic(create.localId)\n  props[MAGIC_KEY] = { value: magic }\n\n  // Add the getters:\n  for (const n in create.props) {\n    props[n] = { enumerable: true, get: makeProxyGetter(magic, n) }\n  }\n\n  // Add the methods:\n  for (const n of create.methods) {\n    props[n] = { value: makeProxyMethod(state, magic, n) }\n  }\n\n  // Make the object:\n  return Object.create(Object.prototype, props)\n}\n\n/**\n * Unpacks a proxy's properties into the magic storage area.\n */\nexport function updateObjectProps(\n  state: BridgeState,\n  o: Object,\n  props: PackedProps\n): mixed {\n  const magic: ProxyMagic = o[MAGIC_KEY]\n\n  for (const n in props) {\n    try {\n      magic.props[n] = unpackData(state, props[n], n)\n      magic.errors[n] = false\n    } catch (e) {\n      magic.props[n] = e\n      magic.errors[n] = true\n    }\n  }\n}\n\nfunction makeProxyGetter(magic: ProxyMagic, name: string) {\n  return function get() {\n    if (magic.errors[name]) throw magic.props[name]\n    return magic.props[name]\n  }\n}\n\nfunction makeProxyMethod(state: BridgeState, magic: ProxyMagic, name: string) {\n  return function method(...args) {\n    if (magic.closed) {\n      return Promise.reject(\n        new TypeError(`Cannot call method '${name}' of closed proxy`)\n      )\n    }\n    return state.emitCall(magic.remoteId, name, args)\n  }\n}\n","/* global setTimeout */\n// @flow\n\nimport type { BridgeOptions, SendMessage } from './bridge.js'\nimport { type ObjectTable, packData, packThrow, unpackData } from './data.js'\nimport { bridgifyClass, getInstanceMagic } from './magic.js'\nimport { close, emit, update } from './manage.js'\nimport {\n  type ValueCache,\n  diffObject,\n  dirtyValue,\n  makeProxy,\n  packObject,\n  updateObjectProps\n} from './objects.js'\nimport type {\n  CallMessage,\n  ChangeMessage,\n  CreateMessage,\n  EventMessage,\n  Message,\n  ReturnMessage\n} from './protocol.js'\n\nexport class BridgeState implements ObjectTable {\n  // Objects:\n  +proxies: { [objectId: number]: Object }\n  +objects: { [localId: number]: Object }\n  +caches: { [localId: number]: ValueCache }\n\n  // Outgoing method calls:\n  nextCallId: number\n  pendingCalls: {\n    [callId: number]: { name: string, resolve: Function, reject: Function }\n  }\n\n  // Pending message:\n  dirty: { [localId: number]: { cache: ValueCache, object: Object } }\n  message: Message\n\n  // Update scheduling:\n  closed: boolean\n  +throttleMs: number\n  lastUpdate: number\n  sendPending: boolean\n  +sendMessage: SendMessage\n\n  constructor(opts: BridgeOptions) {\n    const { sendMessage, throttleMs = 0 } = opts\n\n    // Objects:\n    this.proxies = {}\n    this.objects = {}\n    this.caches = {}\n\n    // Outgoing method calls:\n    this.nextCallId = 0\n    this.pendingCalls = {}\n\n    // Pending message:\n    this.dirty = {}\n    this.message = {}\n\n    // Update scheduling:\n    this.throttleMs = throttleMs\n    this.lastUpdate = 0\n    this.sendPending = false\n    this.sendMessage = sendMessage\n  }\n\n  /**\n   * Close the bridge, so it will no longer send messages.\n   * This also closes all proxies created by the bridge and rejects\n   * all pending calls.\n   */\n  close(error: Error) {\n    for (const callId in this.pendingCalls) {\n      const call = this.pendingCalls[Number(callId)]\n      call.reject(error)\n    }\n    for (const objectId in this.proxies) {\n      close(this.proxies[Number(objectId)])\n    }\n    this.closed = true\n  }\n\n  /**\n   * Grabs an object by its proxy id.\n   */\n  getObject(packedId: number): Object | void {\n    return packedId < 0 ? this.proxies[-packedId] : this.objects[packedId]\n  }\n\n  /**\n   * Returns an object's id relative to this bridge.\n   * The id is positive for objects created on this side of the bridge,\n   * and negative for proxy objects reflecting things on the other side.\n   */\n  getPackedId(o: Object): number | null {\n    const magic = getInstanceMagic(o)\n    if (magic.closed) return null\n    if (magic.remoteId != null && this.proxies[magic.remoteId] != null) {\n      return -magic.remoteId\n    }\n    if (this.objects[magic.localId] == null) {\n      // Add unknown objects to the bridge:\n      this.objects[magic.localId] = o\n\n      const { cache, create } = packObject(this, o)\n      this.caches[magic.localId] = cache\n      magic.bridges.push(this)\n      this.emitCreate(create, o)\n    }\n    return magic.localId\n  }\n\n  /**\n   * Marks an object as needing changes.\n   */\n  markDirty(localId: number, name?: string): void {\n    const cache = this.caches[localId]\n    if (name != null && name in cache) cache[name] = dirtyValue\n\n    this.dirty[localId] = { cache, object: this.objects[localId] }\n    this.wakeup()\n  }\n\n  /**\n   * Marks an object as being deleted.\n   */\n  emitClose(localId: number): void {\n    delete this.objects[localId]\n    delete this.caches[localId]\n    if (this.message.closed == null) this.message.closed = []\n    this.message.closed.push(localId)\n    this.wakeup()\n  }\n\n  /**\n   * Attaches an object to this bridge, sending a creation message.\n   */\n  emitCreate(create: CreateMessage, o: Object): void {\n    if (this.message.created == null) this.message.created = []\n    this.message.created.push(create)\n    // this.wakeup() not needed, since this is part of data packing.\n  }\n\n  /**\n   * Enqueues a proxy call message.\n   */\n  emitCall(remoteId: number, name: string, args: mixed): Promise<mixed> {\n    const callId = this.nextCallId++\n    const message: CallMessage = {\n      callId,\n      remoteId,\n      name,\n      ...packData(this, args)\n    }\n    if (this.message.calls == null) this.message.calls = []\n    this.message.calls.push(message)\n    this.wakeup()\n\n    return new Promise((resolve, reject) => {\n      this.pendingCalls[callId] = { name, resolve, reject }\n    })\n  }\n\n  /**\n   * Enqueues an event message.\n   */\n  emitEvent(localId: number, name: string, payload: mixed): void {\n    const message: EventMessage = {\n      localId,\n      name,\n      ...packData(this, payload)\n    }\n    if (this.message.events == null) this.message.events = []\n    this.message.events.push(message)\n    this.wakeup()\n  }\n\n  /**\n   * Enqueues a function return message.\n   */\n  emitReturn(callId: number, fail: boolean, value: mixed): void {\n    const message: ReturnMessage = {\n      callId,\n      ...(fail ? packThrow(this, value) : packData(this, value))\n    }\n    if (this.message.returns == null) this.message.returns = []\n    this.message.returns.push(message)\n    this.wakeup()\n  }\n\n  /**\n   * Handles an incoming message,\n   * updating state and triggering side-effects as needed.\n   */\n  handleMessage(message: Message): void {\n    // ----------------------------------------\n    // Phase 1: Get our proxies up to date.\n    // ----------------------------------------\n\n    // Handle newly-created objects:\n    if (message.created) {\n      // Pass 1: Create proxies for the new objects:\n      for (const create of message.created) {\n        this.proxies[create.localId] = makeProxy(this, create)\n      }\n\n      // Pass 2: Fill in the values:\n      for (const create of message.created) {\n        updateObjectProps(this, this.proxies[create.localId], create.props)\n      }\n    }\n\n    // Handle updated objects:\n    if (message.changed) {\n      // Pass 1: Update all the proxies:\n      for (const change of message.changed) {\n        const { localId, props } = change\n        const o = this.proxies[localId]\n        if (o == null) {\n          throw new RangeError(`Invalid localId ${localId}`)\n        }\n        updateObjectProps(this, o, props)\n      }\n\n      // Pass 2: Fire the callbacks:\n      for (const change of message.changed) {\n        update(this.proxies[change.localId])\n      }\n    }\n\n    // ----------------------------------------\n    // Phase 2: Handle events & method calls\n    // ----------------------------------------\n\n    // Handle events:\n    if (message.events) {\n      for (const event of message.events) {\n        const { localId, name } = event\n        const o = localId === 0 ? this : this.proxies[localId]\n        if (o == null) continue\n        try {\n          emit(o, name, unpackData(this, event, name))\n        } catch (e) {\n          emit(o, 'error', e) // Payload unpacking problem\n        }\n      }\n    }\n\n    // Handle method calls:\n    if (message.calls) {\n      for (const call of message.calls) {\n        const { callId, remoteId, name } = call\n\n        try {\n          const o = this.objects[remoteId]\n          if (o == null) {\n            throw new TypeError(\n              `Cannot call method '${name}' of closed proxy (remote)`\n            )\n          }\n          if (typeof o[name] !== 'function') {\n            throw new TypeError(`'${name}' is not a function`)\n          }\n          const args = unpackData(this, call, `${name}.arguments`)\n          Promise.resolve(o[name].apply(o, args)).then(\n            value => this.emitReturn(callId, false, value),\n            e => this.emitReturn(callId, true, e)\n          )\n        } catch (e) {\n          this.emitReturn(callId, true, e)\n        }\n      }\n    }\n\n    // Handle method returns:\n    if (message.returns) {\n      for (const ret of message.returns) {\n        const { callId } = ret\n        const pendingCall = this.pendingCalls[callId]\n        if (pendingCall == null) {\n          throw new RangeError(`Invalid callId ${callId}`)\n        }\n        try {\n          pendingCall.resolve(\n            unpackData(this, ret, `${pendingCall.name}.return`)\n          )\n        } catch (e) {\n          pendingCall.reject(e)\n        } finally {\n          delete this.pendingCalls[callId]\n        }\n      }\n    }\n\n    // ----------------------------------------\n    // Phase 3: Clean up closed objects\n    // ----------------------------------------\n\n    if (message.closed) {\n      for (const localId of message.closed) {\n        const o = this.proxies[localId]\n        if (o == null) return\n        delete this.proxies[localId]\n        close(o)\n      }\n    }\n  }\n\n  /**\n   * Sends the current message.\n   */\n  sendNow(): void {\n    if (this.closed) return\n\n    // Build change messages:\n    for (const id in this.dirty) {\n      const localId = Number(id)\n      const { object, cache } = this.dirty[localId]\n      const { dirty, props } = diffObject(this, object, cache)\n      if (dirty) {\n        const message: ChangeMessage = { localId, props }\n        if (this.message.changed == null) this.message.changed = []\n        this.message.changed.push(message)\n      }\n    }\n\n    const message = this.message\n    this.dirty = {}\n    this.message = {}\n    this.sendMessage(message)\n  }\n\n  /**\n   * Something has changed, so prepare to send the pending message:\n   */\n  wakeup(): void {\n    if (this.sendPending) return\n\n    this.sendPending = true\n    const task = () => {\n      this.sendPending = false\n      this.lastUpdate = Date.now()\n      this.sendNow()\n    }\n\n    // We really do want `setTimeout` here, even if the delay is 0,\n    // since promises and other micro tasks should fire first.\n    const delay = this.lastUpdate + this.throttleMs - Date.now()\n    setTimeout(task, delay < 0 ? 0 : delay)\n  }\n}\n\nbridgifyClass(BridgeState)\n","// @flow\n\nimport { packData, unpackData } from './data.js'\nimport { addListener } from './manage.js'\nimport { type Message } from './protocol.js'\nimport { BridgeState } from './state.js'\n\n/**\n * The bridge sends messages using this function.\n */\nexport type SendMessage = (message: Object) => mixed\n\n/**\n * Options used to create a new bridge.\n */\nexport type BridgeOptions = {\n  sendMessage: SendMessage,\n  throttleMs?: number\n}\n\n/**\n * Options used to create a new local bridge.\n */\nexport type LocalBridgeOptions = {\n  cloneMessage?: (x: Object) => Object,\n  throttleMs?: number\n}\n\n/**\n * An object bridge.\n */\nexport class Bridge {\n  +_state: BridgeState\n  +_rootPromise: Promise<Object>\n\n  constructor(opts: BridgeOptions) {\n    this._state = new BridgeState(opts)\n    this._rootPromise = new Promise(resolve =>\n      addListener(this._state, 'root', resolve)\n    )\n  }\n\n  handleMessage(message: Message): mixed {\n    this._state.handleMessage(message)\n  }\n\n  getRoot() {\n    return this._rootPromise\n  }\n\n  sendRoot(root: Object) {\n    this._state.emitEvent(0, 'root', root)\n  }\n\n  close(error: Error) {\n    this._state.close(error)\n  }\n}\n\n/**\n * Bridges a single object locally. This is great for unit tests,\n * where you want to verify that your API works correctly over a bridge,\n * but don't want to actually spawn a separate process.\n */\nexport function makeLocalBridge<T>(o: T, opts: LocalBridgeOptions = {}): T {\n  function nopClone(m: Object): Object {\n    return m\n  }\n  const { cloneMessage = nopClone, throttleMs } = opts\n\n  const serverState = new BridgeState({\n    sendMessage(message) {\n      clientState.handleMessage(cloneMessage(message))\n    },\n    throttleMs\n  })\n  const clientState = new BridgeState({\n    sendMessage(message) {\n      serverState.handleMessage(cloneMessage(message))\n    },\n    throttleMs\n  })\n\n  const data = cloneMessage(packData(serverState, o))\n  serverState.sendNow()\n  return unpackData(clientState, cloneMessage(data), 'root')\n}\n","// @flow\n\nimport { bridgifyClass, shareData } from './magic.js'\nimport type { Subscriber } from './manage.js'\nimport { addListener, addWatcher, close, emit, update } from './manage.js'\n\n/**\n * The `on` function,\n * but packaged as a method and ready to be placed on an object.\n */\nexport const onMethod: Function = function on(name, f) {\n  return addListener(this, name, f)\n}\n\n/**\n * The `watch` function,\n * but packaged as a method and ready to be placed on an object.\n */\nexport const watchMethod: Function = function watch(name, f) {\n  return addWatcher(this, name, f)\n}\n\nshareData({ onMethod, watchMethod })\n\n/**\n * The base class for all bridgeable API's. Provides callback capability.\n */\nexport class Bridgeable<Props: {} = {}, Events: {} = {}> {\n  +on: Subscriber<Events>\n  +watch: Subscriber<Props>\n\n  _close() {\n    close(this)\n  }\n\n  _emit<Name: $Keys<Events>>(\n    name: Name,\n    payload: $ElementType<Events, Name>\n  ): mixed {\n    return emit(this, name, payload)\n  }\n\n  _update(name?: $Keys<Props>) {\n    update(this, name)\n  }\n}\n\n// Put the shared methods onto the prototype:\nconst hack: any = Bridgeable.prototype\nhack.on = onMethod\nhack.watch = 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+{"version":3,"file":"yaob.cjs.js","sources":["../src/magic.js","../src/data.js","../src/manage.js","../src/objects.js","../src/state.js","../src/bridge.js","../src/bridgeable.js"],"sourcesContent":["// @flow\n/**\n * @file\n * Bridgeable objects have a special \"magic\" property.\n * This file contains routines for working with these magic properties.\n */\n\nimport type { BridgeState } from './state.js'\n\n// An object is bridgeable if it has this key:\nexport const MAGIC_KEY = '_yaob'\n\n/**\n * Magic data used to mark classes as bridgeable.\n */\nexport type ClassMagic = {}\n\n/**\n * Magic data shared by all object instances.\n */\ntype ObjectMagic = {\n  // The object id on this side of the bridge:\n  +localId: number,\n\n  // The object is no longer bridgeable when set:\n  closed?: true,\n\n  // Bridges subscribed to this object:\n  bridges: Array<BridgeState>,\n\n  // Event listeners subscribed to this object:\n  listeners: { [name: string]: Array<Function> },\n\n  // Property watchers subscribed to this object:\n  watchers: { [name: string]: { data: mixed, fs: Array<Function> } }\n}\n\n/**\n * Magic data found on user-facing object instances.\n */\nexport type InstanceMagic = ObjectMagic & {\n  // This is a proxy object if set. See ProxyMagic for other properties:\n  +remoteId?: number\n}\n\n/**\n * Magic data found on proxy objects.\n */\nexport type ProxyMagic = ObjectMagic & {\n  +remoteId: number,\n\n  // True if the property getter should throw the value:\n  +errors: { [name: string]: boolean },\n\n  // Values for property getters to return:\n  +props: { [name: string]: mixed }\n}\n\n/**\n * Magic data found on shared props.\n */\nexport type SharedMagic = {\n  +shareId: string\n}\n\nlet nextLocalId = 1\nexport const sharedData: { [sharedId: string]: mixed } = {}\n\n/**\n * Adds or updates an object's magic data.\n */\nfunction addMagic(o: Object, magic: ClassMagic | ObjectMagic | SharedMagic) {\n  if (Object.prototype.hasOwnProperty.call(o, MAGIC_KEY)) {\n    Object.assign(o[MAGIC_KEY], magic)\n  } else {\n    Object.defineProperty(o, MAGIC_KEY, { value: magic })\n  }\n}\n\n/**\n * Makes a class bridgeable, including anything derived from it.\n */\nexport function bridgifyClass<Type: Function>(Class: Type): Type {\n  const o = Class.prototype\n  if (!Object.prototype.hasOwnProperty.call(o, MAGIC_KEY)) {\n    const magic: ClassMagic = {}\n    addMagic(o, magic)\n  }\n  return Class\n}\n\n/**\n * Makes an object instance bridgeable.\n */\nexport function bridgifyObject<Type: Object>(o: Type): Type {\n  if (\n    !Object.prototype.hasOwnProperty.call(o, MAGIC_KEY) ||\n    o[MAGIC_KEY].localId == null\n  ) {\n    const magic: InstanceMagic = {\n      localId: nextLocalId++,\n      bridges: [],\n      listeners: {},\n      watchers: {}\n    }\n    addMagic(o, magic)\n  }\n  return o\n}\n\n/**\n * Gets the magic data from an object instance.\n */\nexport function getInstanceMagic(o: Object): InstanceMagic {\n  // We only want to look at bridgeable objects:\n  if (o[MAGIC_KEY] == null) throw new TypeError('Not a bridgeable object')\n\n  bridgifyObject(o)\n  return o[MAGIC_KEY]\n}\n\n/**\n * Creates a new `ProxyMagic` object.\n */\nexport function makeProxyMagic(remoteId: number): ProxyMagic {\n  return {\n    // InstanceMagic:\n    localId: nextLocalId++,\n    bridges: [],\n    listeners: {},\n    watchers: {},\n    // ProxyMagic:\n    remoteId,\n    errors: {},\n    props: {}\n  }\n}\n\n/**\n * Adds items to the global shared data table.\n */\nexport function shareData(\n  table: { [name: string]: Object },\n  namespace?: string\n) {\n  if (namespace == null) namespace = ''\n  else namespace += '.'\n\n  for (const n of Object.getOwnPropertyNames(table)) {\n    const shareId = namespace + n\n    if (sharedData[shareId] != null) {\n      throw new Error(`A shared value named ${shareId} already exists`)\n    }\n    sharedData[shareId] = table[n]\n    addMagic(table[n], { shareId })\n  }\n}\n","// @flow\n/**\n * @file\n * Routines for breaking primitive values into messages,\n * and then restoring those messages into values on the other side.\n */\n\nimport { base64 } from 'rfc4648'\n\nimport { MAGIC_KEY, sharedData } from './magic.js'\n\n/**\n * The data-packing system uses this interface to turn\n * bridgeable objects into packedId's and vice-versa.\n */\nexport interface ObjectTable {\n  getPackedId(o: Object): number | null;\n  getObject(packedId: number): Object | void;\n}\n\n/**\n * The bridge tries to send values as-is, but that isn't always possible.\n * If this data structure is non-null, the strings indicate what changes\n * need to take place to the value. This data structure is recursive,\n * so it matches the \"shape\" of the value.\n */\nexport type DataMap =\n  | { +[name: string]: DataMap }\n  | Array<DataMap>\n  | '' // No change\n  | '?' // Invalid value\n  | 'd' // Date\n  | 'e' // Error\n  | 'o' // Object\n  | 's' // Shared data\n  | 'u' // Undefined\n  | 'ab' // ArrayBuffer\n  | 'u8' // Uint8Array\n\n/**\n * A pure JSON value type.\n */\nexport type JsonValue =\n  | { +[name: string]: JsonValue }\n  | Array<JsonValue>\n  | false\n  | null\n  | number\n  | string\n  | true\n\n/**\n * A value for sending over the wire.\n * If the `value` needs to be modified on the client side,\n * those modifications are in the `map` structure.\n * If this value was thrown, `throw` will be true.\n */\nexport type PackedData = {\n  +map?: DataMap,\n  +raw: JsonValue,\n  +throw?: true\n}\n\n/**\n * The bridge turns errors into these objects.\n */\nexport type PackedError = {\n  +base: string | null\n} & PackedData // Object properties\n\n/**\n * Prepares a value for sending over the wire.\n */\nexport function packData(table: ObjectTable, data: mixed): PackedData {\n  try {\n    const map = mapData(table, data)\n    const raw = packItem(table, map, data)\n    return map !== '' ? { map, raw } : { raw }\n  } catch (data) {\n    return packThrow(table, data)\n  }\n}\n\n/**\n * Prepares a thrown value for sending over the wire.\n */\nexport function packThrow(table: ObjectTable, data: mixed): PackedData {\n  const map = mapData(table, data)\n  const raw = packItem(table, map, data)\n  return { map, raw, throw: true }\n}\n\n/**\n * Restores a value that has been sent over the wire.\n */\nexport function unpackData(\n  table: ObjectTable,\n  data: PackedData,\n  path: string\n): any {\n  const { map, raw } = data\n  const out = map != null ? unpackItem(table, map, raw, path) : raw\n  if (data.throw) throw out\n  return out\n}\n\n/**\n * Searches through a value, looking for data we can't send directly.\n * Returns a map showing where fixes need to take place.\n */\nfunction mapData(table: ObjectTable, data: mixed): DataMap {\n  switch (typeof data) {\n    case 'boolean':\n    case 'number':\n    case 'string':\n      return ''\n\n    case 'object': {\n      if (data === null) return ''\n      if (data instanceof Date) return 'd'\n      if (data instanceof Error) return 'e'\n      if (data instanceof ArrayBuffer) return 'ab'\n      if (data instanceof Uint8Array) return 'u8'\n      if (data[MAGIC_KEY] != null) {\n        return data[MAGIC_KEY].shareId != null ? 's' : 'o'\n      }\n\n      // Arrays:\n      if (Array.isArray(data)) {\n        let out: Array<DataMap> | '' = ''\n        for (let i = 0; i < data.length; ++i) {\n          const map = mapData(table, data[i])\n          if (map !== '' && out === '') {\n            out = []\n            for (let j = 0; j < i; ++j) out[j] = ''\n          }\n          if (out !== '') out[i] = map\n        }\n        return out\n      }\n\n      // Data objects:\n      let out: { [name: string]: DataMap } | '' = ''\n      for (const n in data) {\n        const map = mapData(table, data[n])\n        if (map !== '') {\n          if (out === '') out = {}\n          out[n] = map\n        }\n      }\n      return out\n    }\n\n    case 'undefined':\n      return 'u'\n\n    case 'function':\n      // $FlowFixMe - MAGIC_KEY isn't a known property here\n      return data[MAGIC_KEY] != null && data[MAGIC_KEY].shareId != null\n        ? 's'\n        : '?'\n\n    default:\n      return '?'\n  }\n}\n\n/**\n * Breaks down an error object into a JSON representation.\n */\nfunction packError(table: ObjectTable, o: Object): PackedError {\n  // Grab the properties off the object:\n  const { message, stack } = o\n  const props = { message, stack, ...o }\n\n  let base = null\n  if (o instanceof EvalError) base = 'EvalError'\n  else if (o instanceof RangeError) base = 'RangeError'\n  else if (o instanceof ReferenceError) base = 'ReferenceError'\n  else if (o instanceof SyntaxError) base = 'SyntaxError'\n  else if (o instanceof TypeError) base = 'TypeError'\n  else if (o instanceof URIError) base = 'URIError'\n\n  // Build the JSON value:\n  return { base, ...packData(table, props) }\n}\n\n/**\n * Copies a value, removing any API objects identified in the types.\n */\nfunction packItem(table: ObjectTable, map: DataMap, data: any): JsonValue {\n  switch (map) {\n    case '':\n      return data\n\n    case '?':\n      return typeof data\n\n    case 'd':\n      return data.toISOString()\n\n    case 'e':\n      return packError(table, data)\n\n    case 'o':\n      return table.getPackedId(data)\n\n    case 's':\n      return data[MAGIC_KEY].shareId\n\n    case 'u':\n      return null\n\n    case 'ab':\n      return base64.stringify(new Uint8Array(data))\n\n    case 'u8':\n      return base64.stringify(data)\n\n    default: {\n      // Arrays:\n      if (Array.isArray(map)) {\n        const out = []\n        for (let i = 0; i < map.length; ++i) {\n          out[i] = packItem(table, map[i], data[i])\n        }\n        return out\n      }\n\n      // Objects:\n      const out = {}\n      for (const n in data) {\n        out[n] = n in map ? packItem(table, map[n], data[n]) : data[n]\n      }\n      return out\n    }\n  }\n}\n\n/**\n * Restores an error object from its JSON representation.\n */\nfunction unpackError(\n  table: ObjectTable,\n  value: PackedError,\n  path: string\n): Error {\n  const bases = {\n    EvalError,\n    RangeError,\n    ReferenceError,\n    SyntaxError,\n    TypeError,\n    URIError\n  }\n\n  // Make the object:\n  const Base = value.base != null ? bases[value.base] || Error : Error\n  const out: Object = new Base()\n\n  // Restore the properties:\n  const props = unpackData(table, value, path)\n  for (const n in props) out[n] = props[n]\n\n  return out\n}\n\n/**\n * Restores a value that has been sent over the wire.\n */\nfunction unpackItem(\n  table: ObjectTable,\n  map: DataMap,\n  raw: any,\n  path: string\n): any {\n  switch (map) {\n    case '':\n      return raw\n\n    case '?': {\n      const type = typeof raw === 'string' ? raw : '?'\n      throw new TypeError(`Unsupported value of type ${type} at ${path}`)\n    }\n\n    case 'd':\n      return new Date(raw)\n\n    case 'e':\n      if (typeof raw !== 'object' || raw === null) {\n        throw new TypeError(`Expecting an error description at ${path}`)\n      }\n      return unpackError(table, raw, path)\n\n    case 'o': {\n      if (raw === null) {\n        throw new TypeError(`Closed bridge object at ${path}`)\n      }\n      if (typeof raw !== 'number') {\n        throw new TypeError(`Expecting a packedId at ${path}`)\n      }\n      const o = table.getObject(-raw)\n      if (o == null) throw new RangeError(`Invalid packedId ${raw} at ${path}`)\n      return o\n    }\n\n    case 's': {\n      if (typeof raw !== 'string') {\n        throw new TypeError(`Expecting a shareId at ${path}`)\n      }\n      const s = sharedData[raw]\n      if (s == null) throw new RangeError(`Invalid shareId '${raw}' at ${path}`)\n      return s\n    }\n\n    case 'u':\n      return undefined\n\n    case 'ab':\n      if (typeof raw !== 'string') {\n        throw new TypeError(`Expecting a base64 string at ${path}`)\n      }\n      return base64.parse(raw).buffer\n\n    case 'u8':\n      if (typeof raw !== 'string') {\n        throw new TypeError(`Expecting a base64 string at ${path}`)\n      }\n      return base64.parse(raw)\n\n    default: {\n      if (typeof map !== 'object' || map === null) {\n        throw new TypeError(`Invalid type information ${map} at ${path}`)\n      }\n      if (typeof raw !== 'object' || raw === null) {\n        throw new TypeError(`Expecting an array or object at ${path}`)\n      }\n\n      // Arrays:\n      if (Array.isArray(map)) {\n        if (!Array.isArray(raw)) {\n          throw new TypeError(`Expecting an array at ${path}`)\n        }\n        const out = []\n        for (let i = 0; i < map.length; ++i) {\n          out[i] = unpackItem(table, map[i], raw[i], `${path}[${i}]`)\n        }\n        return out\n      }\n\n      // Objects:\n      const out = {}\n      for (const n in raw) {\n        out[n] =\n          n in map ? unpackItem(table, map[n], raw[n], `${path}.${n}`) : raw[n]\n      }\n      return out\n    }\n  }\n}\n","// @flow\n/**\n * @file\n * Functions for managing updates, events, and object lifetime.\n */\n\nimport { getInstanceMagic } from './magic.js'\n\n/**\n * Undoes the effect of `on`.\n */\nexport type CallbackRemover = () => mixed\n\n/**\n * Signature of the `on` method.\n */\nexport type Subscriber<Events: {} = {}> = <Name: $Keys<Events>>(\n  name: Name,\n  f: (v: $ElementType<Events, Name>) => mixed\n) => CallbackRemover\n\n// No user-supplied value will ever be identical to this.\nexport const dirtyValue = {}\n\n/**\n * Subscribes to an event on a bridgeable object.\n */\nexport function addListener(\n  o: Object,\n  name: string,\n  f: Function\n): CallbackRemover {\n  const { closed, listeners } = getInstanceMagic(o)\n\n  if (closed) return () => {}\n  if (listeners[name] == null) listeners[name] = [f]\n  else listeners[name].push(f)\n\n  return function unsubscribe() {\n    listeners[name] = listeners[name].filter(i => i !== f)\n  }\n}\n\n/**\n * Subscribes to property changes on a bridgeable object.\n */\nexport function addWatcher(\n  o: Object,\n  name: string,\n  f: Function\n): CallbackRemover {\n  const { closed, watchers } = getInstanceMagic(o)\n\n  // Don't catch access errors, since we want the user to see them:\n  const data = o[name]\n\n  if (closed) return () => {}\n  if (watchers[name] == null) watchers[name] = { data, fs: [f] }\n  else watchers[name].fs.push(f)\n\n  return function unsubscribe() {\n    watchers[name].fs = watchers[name].fs.filter(i => i !== f)\n  }\n}\n\n/**\n * Destroys a proxy.\n * The remote client will completely forget about this object,\n * and accessing it will become an error.\n */\nexport function close(o: Object): mixed {\n  const magic = getInstanceMagic(o)\n\n  // Call local callbacks:\n  const listeners = magic.listeners.close\n  if (listeners != null) {\n    for (const f of listeners) {\n      callCallback(o, f, undefined, true)\n    }\n  }\n\n  magic.closed = true\n  for (const bridge of magic.bridges) {\n    bridge.emitClose(magic.localId)\n  }\n  magic.bridges = []\n  magic.listeners = {}\n  magic.watchers = {}\n}\n\n/**\n * Emits an event on a bridgeable object.\n */\nexport function emit(o: Object, name: string, payload: mixed): mixed {\n  const magic = getInstanceMagic(o)\n  if (magic.closed) throw new Error('Cannot emit event on closed object')\n\n  // Schedule outgoing event messages:\n  for (const bridge of magic.bridges) {\n    bridge.emitEvent(magic.localId, name, payload)\n  }\n\n  // Call local callbacks:\n  const listeners = magic.listeners[name]\n  if (listeners != null) {\n    for (const f of listeners) {\n      callCallback(o, f, payload, name !== 'error')\n    }\n  }\n}\n\n/**\n * Marks an object as having changes. The proxy server will send an update.\n */\nexport function update<T: {}>(o: T, name?: $Keys<T>): mixed {\n  const magic = getInstanceMagic(o)\n  if (magic.closed) throw new Error('Cannot update closed object')\n\n  for (const bridge of magic.bridges) {\n    bridge.markDirty(magic.localId, name)\n  }\n\n  // Blow away the cache if we have a name:\n  if (name != null && magic.watchers[name] != null) {\n    magic.watchers[name].data = dirtyValue\n  }\n\n  // Call watcher callbacks:\n  for (const n in magic.watchers) {\n    const cache = magic.watchers[n]\n    try {\n      const data = o[n]\n      if (data !== cache.data) {\n        cache.data = data\n        for (const f of cache.fs) callCallback(o, f, cache.data, true)\n      }\n    } catch (e) {}\n  }\n}\n\n/**\n * Calls a user-supplied callback function with error checking.\n */\nexport function callCallback(\n  o: Object,\n  f: Function,\n  payload: mixed,\n  emitError: boolean\n) {\n  try {\n    const out = f(payload)\n\n    // If the function returns a promise, emit an error if it rejects:\n    if (emitError && out != null && typeof out.then === 'function') {\n      out.then(undefined, e => emit(o, 'error', e))\n    }\n  } catch (e) {\n    if (emitError) emit(o, 'error', e)\n  }\n}\n","// @flow\n/**\n * @file\n * Routines for breaking bridgeable objects into messages,\n * and then restoring those messages into proxies on the other side.\n */\n\nimport { packData, packThrow, unpackData } from './data.js'\nimport {\n  type ProxyMagic,\n  getInstanceMagic,\n  MAGIC_KEY,\n  makeProxyMagic\n} from './magic.js'\nimport type { CreateMessage, PackedProps } from './protocol.js'\nimport type { BridgeState } from './state.js'\n\nexport type ValueCache = { [name: string]: mixed }\n\n// No user-supplied value will ever be identical to this.\nexport const dirtyValue = {}\n\n/**\n * Examines a bridgeable object and prepares it for sending of the wire.\n * Returns a creation method an the initial value cache.\n */\nexport function packObject(\n  state: BridgeState,\n  o: Object\n): {\n  cache: ValueCache,\n  create: CreateMessage\n} {\n  // Iterate the prototype chain, looking for property names:\n  const allNames: { [name: string]: true } = {}\n  const end = Object.prototype\n  for (let p = o; p !== end && p != null; p = Object.getPrototypeOf(p)) {\n    for (const name of Object.getOwnPropertyNames(p)) {\n      if (name !== MAGIC_KEY && !/^_/.test(name) && name !== 'constructor') {\n        allNames[name] = true\n      }\n    }\n  }\n\n  // Iterate over the object's properties and add their names to\n  // the method list or the value cache.\n  const cache: ValueCache = {}\n  const methods: Array<string> = []\n  const props: PackedProps = {}\n  for (const n in allNames) {\n    try {\n      const data = o[n]\n      if (\n        typeof data === 'function' &&\n        (data[MAGIC_KEY] == null || data[MAGIC_KEY].shareId == null)\n      ) {\n        methods.push(n)\n      } else {\n        cache[n] = data\n        props[n] = packData(state, data)\n      }\n    } catch (e) {\n      cache[n] = dirtyValue\n      props[n] = packThrow(state, e)\n    }\n  }\n\n  const { localId } = getInstanceMagic(o)\n  const create: CreateMessage = { localId, methods, props }\n  return { cache, create }\n}\n\n/**\n * Checks an object for changes.\n * Updates the cache, and returns an object with the necessary changes.\n */\nexport function diffObject(\n  state: BridgeState,\n  o: Object,\n  cache: ValueCache\n): { dirty: boolean, props: PackedProps } {\n  let dirty = false\n  const props: PackedProps = {}\n\n  for (const n in cache) {\n    try {\n      const value = o[n]\n      if (value !== cache[n]) {\n        dirty = true\n        props[n] = packData(state, value)\n        cache[n] = value\n      }\n    } catch (e) {\n      props[n] = packThrow(state, e)\n      cache[n] = dirtyValue\n    }\n  }\n\n  return { dirty, props }\n}\n\n/**\n * Creates an object proxy.\n * The object will have the same values and methods as the original,\n * but will send everything over the bridge.\n */\nexport function makeProxy(state: BridgeState, create: CreateMessage): Object {\n  const props = {}\n\n  // Make the magic property descriptor:\n  const magic = makeProxyMagic(create.localId)\n  props[MAGIC_KEY] = { value: magic }\n\n  // Add the getters:\n  for (const n in create.props) {\n    props[n] = { enumerable: true, get: makeProxyGetter(magic, n) }\n  }\n\n  // Add the methods:\n  for (const n of create.methods) {\n    props[n] = { value: makeProxyMethod(state, magic, n) }\n  }\n\n  // Make the object:\n  return Object.create(Object.prototype, props)\n}\n\n/**\n * Unpacks a proxy's properties into the magic storage area.\n */\nexport function updateObjectProps(\n  state: BridgeState,\n  o: Object,\n  props: PackedProps\n): mixed {\n  const magic: ProxyMagic = o[MAGIC_KEY]\n\n  for (const n in props) {\n    try {\n      magic.props[n] = unpackData(state, props[n], n)\n      magic.errors[n] = false\n    } catch (e) {\n      magic.props[n] = e\n      magic.errors[n] = true\n    }\n  }\n}\n\nfunction makeProxyGetter(magic: ProxyMagic, name: string) {\n  return function get() {\n    if (magic.errors[name]) throw magic.props[name]\n    return magic.props[name]\n  }\n}\n\nfunction makeProxyMethod(state: BridgeState, magic: ProxyMagic, name: string) {\n  return function method(...args) {\n    if (magic.closed) {\n      return Promise.reject(\n        new TypeError(`Cannot call method '${name}' of closed proxy`)\n      )\n    }\n    return state.emitCall(magic.remoteId, name, args)\n  }\n}\n","/* global setTimeout */\n// @flow\n\nimport type { BridgeOptions, SendMessage } from './bridge.js'\nimport { type ObjectTable, packData, packThrow, unpackData } from './data.js'\nimport { bridgifyClass, getInstanceMagic } from './magic.js'\nimport { close, emit, update } from './manage.js'\nimport {\n  type ValueCache,\n  diffObject,\n  dirtyValue,\n  makeProxy,\n  packObject,\n  updateObjectProps\n} from './objects.js'\nimport type {\n  CallMessage,\n  ChangeMessage,\n  CreateMessage,\n  EventMessage,\n  Message,\n  ReturnMessage\n} from './protocol.js'\n\nexport class BridgeState implements ObjectTable {\n  // Objects:\n  +proxies: { [objectId: number]: Object }\n  +objects: { [localId: number]: Object }\n  +caches: { [localId: number]: ValueCache }\n\n  // Outgoing method calls:\n  nextCallId: number\n  pendingCalls: {\n    [callId: number]: { name: string, resolve: Function, reject: Function }\n  }\n\n  // Pending message:\n  dirty: { [localId: number]: { cache: ValueCache, object: Object } }\n  message: Message\n\n  // Update scheduling:\n  closed: boolean\n  +throttleMs: number\n  lastUpdate: number\n  sendPending: boolean\n  +sendMessage: SendMessage\n\n  constructor(opts: BridgeOptions) {\n    const { sendMessage, throttleMs = 0 } = opts\n\n    // Objects:\n    this.proxies = {}\n    this.objects = {}\n    this.caches = {}\n\n    // Outgoing method calls:\n    this.nextCallId = 0\n    this.pendingCalls = {}\n\n    // Pending message:\n    this.dirty = {}\n    this.message = {}\n\n    // Update scheduling:\n    this.throttleMs = throttleMs\n    this.lastUpdate = 0\n    this.sendPending = false\n    this.sendMessage = sendMessage\n  }\n\n  /**\n   * Close the bridge, so it will no longer send messages.\n   * This also closes all proxies created by the bridge and rejects\n   * all pending calls.\n   */\n  close(error: Error) {\n    for (const callId in this.pendingCalls) {\n      const call = this.pendingCalls[Number(callId)]\n      call.reject(error)\n    }\n    for (const objectId in this.proxies) {\n      close(this.proxies[Number(objectId)])\n    }\n    this.closed = true\n  }\n\n  /**\n   * Grabs an object by its proxy id.\n   */\n  getObject(packedId: number): Object | void {\n    return packedId < 0 ? this.proxies[-packedId] : this.objects[packedId]\n  }\n\n  /**\n   * Returns an object's id relative to this bridge.\n   * The id is positive for objects created on this side of the bridge,\n   * and negative for proxy objects reflecting things on the other side.\n   */\n  getPackedId(o: Object): number | null {\n    const magic = getInstanceMagic(o)\n    if (magic.closed) return null\n    if (magic.remoteId != null && this.proxies[magic.remoteId] != null) {\n      return -magic.remoteId\n    }\n    if (this.objects[magic.localId] == null) {\n      // Add unknown objects to the bridge:\n      this.objects[magic.localId] = o\n\n      const { cache, create } = packObject(this, o)\n      this.caches[magic.localId] = cache\n      magic.bridges.push(this)\n      this.emitCreate(create, o)\n    }\n    return magic.localId\n  }\n\n  /**\n   * Marks an object as needing changes.\n   */\n  markDirty(localId: number, name?: string): void {\n    const cache = this.caches[localId]\n    if (name != null && name in cache) cache[name] = dirtyValue\n\n    this.dirty[localId] = { cache, object: this.objects[localId] }\n    this.wakeup()\n  }\n\n  /**\n   * Marks an object as being deleted.\n   */\n  emitClose(localId: number): void {\n    delete this.objects[localId]\n    delete this.caches[localId]\n    if (this.message.closed == null) this.message.closed = []\n    this.message.closed.push(localId)\n    this.wakeup()\n  }\n\n  /**\n   * Attaches an object to this bridge, sending a creation message.\n   */\n  emitCreate(create: CreateMessage, o: Object): void {\n    if (this.message.created == null) this.message.created = []\n    this.message.created.push(create)\n    // this.wakeup() not needed, since this is part of data packing.\n  }\n\n  /**\n   * Enqueues a proxy call message.\n   */\n  emitCall(remoteId: number, name: string, args: mixed): Promise<mixed> {\n    const callId = this.nextCallId++\n    const message: CallMessage = {\n      callId,\n      remoteId,\n      name,\n      ...packData(this, args)\n    }\n    if (this.message.calls == null) this.message.calls = []\n    this.message.calls.push(message)\n    this.wakeup()\n\n    return new Promise((resolve, reject) => {\n      this.pendingCalls[callId] = { name, resolve, reject }\n    })\n  }\n\n  /**\n   * Enqueues an event message.\n   */\n  emitEvent(localId: number, name: string, payload: mixed): void {\n    const message: EventMessage = {\n      localId,\n      name,\n      ...packData(this, payload)\n    }\n    if (this.message.events == null) this.message.events = []\n    this.message.events.push(message)\n    this.wakeup()\n  }\n\n  /**\n   * Enqueues a function return message.\n   */\n  emitReturn(callId: number, fail: boolean, value: mixed): void {\n    const message: ReturnMessage = {\n      callId,\n      ...(fail ? packThrow(this, value) : packData(this, value))\n    }\n    if (this.message.returns == null) this.message.returns = []\n    this.message.returns.push(message)\n    this.wakeup()\n  }\n\n  /**\n   * Handles an incoming message,\n   * updating state and triggering side-effects as needed.\n   */\n  handleMessage(message: Message): void {\n    // ----------------------------------------\n    // Phase 1: Get our proxies up to date.\n    // ----------------------------------------\n\n    // Handle newly-created objects:\n    if (message.created) {\n      // Pass 1: Create proxies for the new objects:\n      for (const create of message.created) {\n        this.proxies[create.localId] = makeProxy(this, create)\n      }\n\n      // Pass 2: Fill in the values:\n      for (const create of message.created) {\n        updateObjectProps(this, this.proxies[create.localId], create.props)\n      }\n    }\n\n    // Handle updated objects:\n    if (message.changed) {\n      // Pass 1: Update all the proxies:\n      for (const change of message.changed) {\n        const { localId, props } = change\n        const o = this.proxies[localId]\n        if (o == null) {\n          throw new RangeError(`Invalid localId ${localId}`)\n        }\n        updateObjectProps(this, o, props)\n      }\n\n      // Pass 2: Fire the callbacks:\n      for (const change of message.changed) {\n        update(this.proxies[change.localId])\n      }\n    }\n\n    // ----------------------------------------\n    // Phase 2: Handle events & method calls\n    // ----------------------------------------\n\n    // Handle events:\n    if (message.events) {\n      for (const event of message.events) {\n        const { localId, name } = event\n        const o = localId === 0 ? this : this.proxies[localId]\n        if (o == null) continue\n        try {\n          emit(o, name, unpackData(this, event, name))\n        } catch (e) {\n          emit(o, 'error', e) // Payload unpacking problem\n        }\n      }\n    }\n\n    // Handle method calls:\n    if (message.calls) {\n      for (const call of message.calls) {\n        const { callId, remoteId, name } = call\n\n        try {\n          const o = this.objects[remoteId]\n          if (o == null) {\n            throw new TypeError(\n              `Cannot call method '${name}' of closed proxy (remote)`\n            )\n          }\n          if (typeof o[name] !== 'function') {\n            throw new TypeError(`'${name}' is not a function`)\n          }\n          const args = unpackData(this, call, `${name}.arguments`)\n          Promise.resolve(o[name].apply(o, args)).then(\n            value => this.emitReturn(callId, false, value),\n            e => this.emitReturn(callId, true, e)\n          )\n        } catch (e) {\n          this.emitReturn(callId, true, e)\n        }\n      }\n    }\n\n    // Handle method returns:\n    if (message.returns) {\n      for (const ret of message.returns) {\n        const { callId } = ret\n        const pendingCall = this.pendingCalls[callId]\n        if (pendingCall == null) {\n          throw new RangeError(`Invalid callId ${callId}`)\n        }\n        try {\n          pendingCall.resolve(\n            unpackData(this, ret, `${pendingCall.name}.return`)\n          )\n        } catch (e) {\n          pendingCall.reject(e)\n        } finally {\n          delete this.pendingCalls[callId]\n        }\n      }\n    }\n\n    // ----------------------------------------\n    // Phase 3: Clean up closed objects\n    // ----------------------------------------\n\n    if (message.closed) {\n      for (const localId of message.closed) {\n        const o = this.proxies[localId]\n        if (o == null) return\n        delete this.proxies[localId]\n        close(o)\n      }\n    }\n  }\n\n  /**\n   * Sends the current message.\n   */\n  sendNow(): void {\n    if (this.closed) return\n\n    // Build change messages:\n    for (const id in this.dirty) {\n      const localId = Number(id)\n      const { object, cache } = this.dirty[localId]\n      const { dirty, props } = diffObject(this, object, cache)\n      if (dirty) {\n        const message: ChangeMessage = { localId, props }\n        if (this.message.changed == null) this.message.changed = []\n        this.message.changed.push(message)\n      }\n    }\n\n    const message = this.message\n    this.dirty = {}\n    this.message = {}\n    this.sendMessage(message)\n  }\n\n  /**\n   * Something has changed, so prepare to send the pending message:\n   */\n  wakeup(): void {\n    if (this.sendPending) return\n\n    this.sendPending = true\n    const task = () => {\n      this.sendPending = false\n      this.lastUpdate = Date.now()\n      this.sendNow()\n    }\n\n    // We really do want `setTimeout` here, even if the delay is 0,\n    // since promises and other micro tasks should fire first.\n    const delay = this.lastUpdate + this.throttleMs - Date.now()\n    setTimeout(task, delay < 0 ? 0 : delay)\n  }\n}\n\nbridgifyClass(BridgeState)\n","// @flow\n\nimport { packData, unpackData } from './data.js'\nimport { addListener } from './manage.js'\nimport { type Message } from './protocol.js'\nimport { BridgeState } from './state.js'\n\n/**\n * The bridge sends messages using this function.\n */\nexport type SendMessage = (message: Object) => mixed\n\n/**\n * Options used to create a new bridge.\n */\nexport type BridgeOptions = {\n  sendMessage: SendMessage,\n  throttleMs?: number\n}\n\n/**\n * Options used to create a new local bridge.\n */\nexport type LocalBridgeOptions = {\n  cloneMessage?: (x: Object) => Object,\n  throttleMs?: number\n}\n\n/**\n * An object bridge.\n */\nexport class Bridge {\n  +_state: BridgeState\n  +_rootPromise: Promise<Object>\n\n  constructor(opts: BridgeOptions) {\n    this._state = new BridgeState(opts)\n    this._rootPromise = new Promise(resolve =>\n      addListener(this._state, 'root', resolve)\n    )\n  }\n\n  handleMessage(message: Message): mixed {\n    this._state.handleMessage(message)\n  }\n\n  getRoot() {\n    return this._rootPromise\n  }\n\n  sendRoot(root: Object) {\n    this._state.emitEvent(0, 'root', root)\n  }\n\n  close(error: Error) {\n    this._state.close(error)\n  }\n}\n\n/**\n * Bridges a single object locally. 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lib/yaob.js

@@ -192,2 +192,3 @@ import { base64 } from 'rfc4648';
         if (data instanceof Error) return 'e';
+        if (data instanceof ArrayBuffer) return 'ab';
         if (data instanceof Uint8Array) return 'u8';
@@ -296,2 +297,5 @@
 
+    case 'ab':
+      return base64.stringify(new Uint8Array(data));
+
     case 'u8':
@@ -406,2 +410,9 @@ return base64.stringify(data);
 
+    case 'ab':
+      if (typeof raw !== 'string') {
+        throw new TypeError("Expecting a base64 string at " + path);
+      }
+
+      return base64.parse(raw).buffer;
+
     case 'u8':
@@ -408,0 +419,0 @@ if (typeof raw !== 'string') {

lib/yaob.js.map

@@ -1,1 +0,1 @@
-{"version":3,"file":"yaob.js","sources":["../src/magic.js","../src/data.js","../src/manage.js","../src/objects.js","../src/state.js","../src/bridge.js","../src/bridgeable.js"],"sourcesContent":["// @flow\n/**\n * @file\n * Bridgeable objects have a special \"magic\" property.\n * This file contains routines for working with these magic properties.\n */\n\nimport type { BridgeState } from './state.js'\n\n// An object is bridgeable if it has this key:\nexport const MAGIC_KEY = '_yaob'\n\n/**\n * Magic data used to mark classes as bridgeable.\n */\nexport type ClassMagic = {}\n\n/**\n * Magic data shared by all object instances.\n */\ntype ObjectMagic = {\n  // The object id on this side of the bridge:\n  +localId: number,\n\n  // The object is no longer bridgeable when set:\n  closed?: true,\n\n  // Bridges subscribed to this object:\n  bridges: Array<BridgeState>,\n\n  // Event listeners subscribed to this object:\n  listeners: { [name: string]: Array<Function> },\n\n  // Property watchers subscribed to this object:\n  watchers: { [name: string]: { data: mixed, fs: Array<Function> } }\n}\n\n/**\n * Magic data found on user-facing object instances.\n */\nexport type InstanceMagic = ObjectMagic & {\n  // This is a proxy object if set. See ProxyMagic for other properties:\n  +remoteId?: number\n}\n\n/**\n * Magic data found on proxy objects.\n */\nexport type ProxyMagic = ObjectMagic & {\n  +remoteId: number,\n\n  // True if the property getter should throw the value:\n  +errors: { [name: string]: boolean },\n\n  // Values for property getters to return:\n  +props: { [name: string]: mixed }\n}\n\n/**\n * Magic data found on shared props.\n */\nexport type SharedMagic = {\n  +shareId: string\n}\n\nlet nextLocalId = 1\nexport const sharedData: { [sharedId: string]: mixed } = {}\n\n/**\n * Adds or updates an object's magic data.\n */\nfunction addMagic(o: Object, magic: ClassMagic | ObjectMagic | SharedMagic) {\n  if (Object.prototype.hasOwnProperty.call(o, MAGIC_KEY)) {\n    Object.assign(o[MAGIC_KEY], magic)\n  } else {\n    Object.defineProperty(o, MAGIC_KEY, { value: magic })\n  }\n}\n\n/**\n * Makes a class bridgeable, including anything derived from it.\n */\nexport function bridgifyClass<Type: Function>(Class: Type): Type {\n  const o = Class.prototype\n  if (!Object.prototype.hasOwnProperty.call(o, MAGIC_KEY)) {\n    const magic: ClassMagic = {}\n    addMagic(o, magic)\n  }\n  return Class\n}\n\n/**\n * Makes an object instance bridgeable.\n */\nexport function bridgifyObject<Type: Object>(o: Type): Type {\n  if (\n    !Object.prototype.hasOwnProperty.call(o, MAGIC_KEY) ||\n    o[MAGIC_KEY].localId == null\n  ) {\n    const magic: InstanceMagic = {\n      localId: nextLocalId++,\n      bridges: [],\n      listeners: {},\n      watchers: {}\n    }\n    addMagic(o, magic)\n  }\n  return o\n}\n\n/**\n * Gets the magic data from an object instance.\n */\nexport function getInstanceMagic(o: Object): InstanceMagic {\n  // We only want to look at bridgeable objects:\n  if (o[MAGIC_KEY] == null) throw new TypeError('Not a bridgeable object')\n\n  bridgifyObject(o)\n  return o[MAGIC_KEY]\n}\n\n/**\n * Creates a new `ProxyMagic` object.\n */\nexport function makeProxyMagic(remoteId: number): ProxyMagic {\n  return {\n    // InstanceMagic:\n    localId: nextLocalId++,\n    bridges: [],\n    listeners: {},\n    watchers: {},\n    // ProxyMagic:\n    remoteId,\n    errors: {},\n    props: {}\n  }\n}\n\n/**\n * Adds items to the global shared data table.\n */\nexport function shareData(\n  table: { [name: string]: Object },\n  namespace?: string\n) {\n  if (namespace == null) namespace = ''\n  else namespace += '.'\n\n  for (const n of Object.getOwnPropertyNames(table)) {\n    const shareId = namespace + n\n    if (sharedData[shareId] != null) {\n      throw new Error(`A shared value named ${shareId} already exists`)\n    }\n    sharedData[shareId] = table[n]\n    addMagic(table[n], { shareId })\n  }\n}\n","// @flow\n/**\n * @file\n * Routines for breaking primitive values into messages,\n * and then restoring those messages into values on the other side.\n */\n\nimport { base64 } from 'rfc4648'\n\nimport { MAGIC_KEY, sharedData } from './magic.js'\n\n/**\n * The data-packing system uses this interface to turn\n * bridgeable objects into packedId's and vice-versa.\n */\nexport interface ObjectTable {\n  getPackedId(o: Object): number | null;\n  getObject(packedId: number): Object | void;\n}\n\n/**\n * The bridge tries to send values as-is, but that isn't always possible.\n * If this data structure is non-null, the strings indicate what changes\n * need to take place to the value. This data structure is recursive,\n * so it matches the \"shape\" of the value.\n */\nexport type DataMap =\n  | { +[name: string]: DataMap }\n  | Array<DataMap>\n  | '' // No change\n  | '?' // Invalid value\n  | 'd' // Date\n  | 'e' // Error\n  | 'o' // Object\n  | 's' // Shared data\n  | 'u' // Undefined\n  | 'u8' // Uint8Array\n\n/**\n * A pure JSON value type.\n */\nexport type JsonValue =\n  | { +[name: string]: JsonValue }\n  | Array<JsonValue>\n  | false\n  | null\n  | number\n  | string\n  | true\n\n/**\n * A value for sending over the wire.\n * If the `value` needs to be modified on the client side,\n * those modifications are in the `map` structure.\n * If this value was thrown, `throw` will be true.\n */\nexport type PackedData = {\n  +map?: DataMap,\n  +raw: JsonValue,\n  +throw?: true\n}\n\n/**\n * The bridge turns errors into these objects.\n */\nexport type PackedError = {\n  +base: string | null\n} & PackedData // Object properties\n\n/**\n * Prepares a value for sending over the wire.\n */\nexport function packData(table: ObjectTable, data: mixed): PackedData {\n  try {\n    const map = mapData(table, data)\n    const raw = packItem(table, map, data)\n    return map !== '' ? { map, raw } : { raw }\n  } catch (data) {\n    return packThrow(table, data)\n  }\n}\n\n/**\n * Prepares a thrown value for sending over the wire.\n */\nexport function packThrow(table: ObjectTable, data: mixed): PackedData {\n  const map = mapData(table, data)\n  const raw = packItem(table, map, data)\n  return { map, raw, throw: true }\n}\n\n/**\n * Restores a value that has been sent over the wire.\n */\nexport function unpackData(\n  table: ObjectTable,\n  data: PackedData,\n  path: string\n): any {\n  const { map, raw } = data\n  const out = map != null ? unpackItem(table, map, raw, path) : raw\n  if (data.throw) throw out\n  return out\n}\n\n/**\n * Searches through a value, looking for data we can't send directly.\n * Returns a map showing where fixes need to take place.\n */\nfunction mapData(table: ObjectTable, data: mixed): DataMap {\n  switch (typeof data) {\n    case 'boolean':\n    case 'number':\n    case 'string':\n      return ''\n\n    case 'object': {\n      if (data === null) return ''\n      if (data instanceof Date) return 'd'\n      if (data instanceof Error) return 'e'\n      if (data instanceof Uint8Array) return 'u8'\n      if (data[MAGIC_KEY] != null) {\n        return data[MAGIC_KEY].shareId != null ? 's' : 'o'\n      }\n\n      // Arrays:\n      if (Array.isArray(data)) {\n        let out: Array<DataMap> | '' = ''\n        for (let i = 0; i < data.length; ++i) {\n          const map = mapData(table, data[i])\n          if (map !== '' && out === '') {\n            out = []\n            for (let j = 0; j < i; ++j) out[j] = ''\n          }\n          if (out !== '') out[i] = map\n        }\n        return out\n      }\n\n      // Data objects:\n      let out: { [name: string]: DataMap } | '' = ''\n      for (const n in data) {\n        const map = mapData(table, data[n])\n        if (map !== '') {\n          if (out === '') out = {}\n          out[n] = map\n        }\n      }\n      return out\n    }\n\n    case 'undefined':\n      return 'u'\n\n    case 'function':\n      // $FlowFixMe - MAGIC_KEY isn't a known property here\n      return data[MAGIC_KEY] != null && data[MAGIC_KEY].shareId != null\n        ? 's'\n        : '?'\n\n    default:\n      return '?'\n  }\n}\n\n/**\n * Breaks down an error object into a JSON representation.\n */\nfunction packError(table: ObjectTable, o: Object): PackedError {\n  // Grab the properties off the object:\n  const { message, stack } = o\n  const props = { message, stack, ...o }\n\n  let base = null\n  if (o instanceof EvalError) base = 'EvalError'\n  else if (o instanceof RangeError) base = 'RangeError'\n  else if (o instanceof ReferenceError) base = 'ReferenceError'\n  else if (o instanceof SyntaxError) base = 'SyntaxError'\n  else if (o instanceof TypeError) base = 'TypeError'\n  else if (o instanceof URIError) base = 'URIError'\n\n  // Build the JSON value:\n  return { base, ...packData(table, props) }\n}\n\n/**\n * Copies a value, removing any API objects identified in the types.\n */\nfunction packItem(table: ObjectTable, map: DataMap, data: any): JsonValue {\n  switch (map) {\n    case '':\n      return data\n\n    case '?':\n      return typeof data\n\n    case 'd':\n      return data.toISOString()\n\n    case 'e':\n      return packError(table, data)\n\n    case 'o':\n      return table.getPackedId(data)\n\n    case 's':\n      return data[MAGIC_KEY].shareId\n\n    case 'u':\n      return null\n\n    case 'u8':\n      return base64.stringify(data)\n\n    default: {\n      // Arrays:\n      if (Array.isArray(map)) {\n        const out = []\n        for (let i = 0; i < map.length; ++i) {\n          out[i] = packItem(table, map[i], data[i])\n        }\n        return out\n      }\n\n      // Objects:\n      const out = {}\n      for (const n in data) {\n        out[n] = n in map ? packItem(table, map[n], data[n]) : data[n]\n      }\n      return out\n    }\n  }\n}\n\n/**\n * Restores an error object from its JSON representation.\n */\nfunction unpackError(\n  table: ObjectTable,\n  value: PackedError,\n  path: string\n): Error {\n  const bases = {\n    EvalError,\n    RangeError,\n    ReferenceError,\n    SyntaxError,\n    TypeError,\n    URIError\n  }\n\n  // Make the object:\n  const Base = value.base != null ? bases[value.base] || Error : Error\n  const out: Object = new Base()\n\n  // Restore the properties:\n  const props = unpackData(table, value, path)\n  for (const n in props) out[n] = props[n]\n\n  return out\n}\n\n/**\n * Restores a value that has been sent over the wire.\n */\nfunction unpackItem(\n  table: ObjectTable,\n  map: DataMap,\n  raw: any,\n  path: string\n): any {\n  switch (map) {\n    case '':\n      return raw\n\n    case '?': {\n      const type = typeof raw === 'string' ? raw : '?'\n      throw new TypeError(`Unsupported value of type ${type} at ${path}`)\n    }\n\n    case 'd':\n      return new Date(raw)\n\n    case 'e':\n      if (typeof raw !== 'object' || raw === null) {\n        throw new TypeError(`Expecting an error description at ${path}`)\n      }\n      return unpackError(table, raw, path)\n\n    case 'o': {\n      if (raw === null) {\n        throw new TypeError(`Closed bridge object at ${path}`)\n      }\n      if (typeof raw !== 'number') {\n        throw new TypeError(`Expecting a packedId at ${path}`)\n      }\n      const o = table.getObject(-raw)\n      if (o == null) throw new RangeError(`Invalid packedId ${raw} at ${path}`)\n      return o\n    }\n\n    case 's': {\n      if (typeof raw !== 'string') {\n        throw new TypeError(`Expecting a shareId at ${path}`)\n      }\n      const s = sharedData[raw]\n      if (s == null) throw new RangeError(`Invalid shareId '${raw}' at ${path}`)\n      return s\n    }\n\n    case 'u':\n      return undefined\n\n    case 'u8':\n      if (typeof raw !== 'string') {\n        throw new TypeError(`Expecting a base64 string at ${path}`)\n      }\n      return base64.parse(raw)\n\n    default: {\n      if (typeof map !== 'object' || map === null) {\n        throw new TypeError(`Invalid type information ${map} at ${path}`)\n      }\n      if (typeof raw !== 'object' || raw === null) {\n        throw new TypeError(`Expecting an array or object at ${path}`)\n      }\n\n      // Arrays:\n      if (Array.isArray(map)) {\n        if (!Array.isArray(raw)) {\n          throw new TypeError(`Expecting an array at ${path}`)\n        }\n        const out = []\n        for (let i = 0; i < map.length; ++i) {\n          out[i] = unpackItem(table, map[i], raw[i], `${path}[${i}]`)\n        }\n        return out\n      }\n\n      // Objects:\n      const out = {}\n      for (const n in raw) {\n        out[n] =\n          n in map ? unpackItem(table, map[n], raw[n], `${path}.${n}`) : raw[n]\n      }\n      return out\n    }\n  }\n}\n","// @flow\n/**\n * @file\n * Functions for managing updates, events, and object lifetime.\n */\n\nimport { getInstanceMagic } from './magic.js'\n\n/**\n * Undoes the effect of `on`.\n */\nexport type CallbackRemover = () => mixed\n\n/**\n * Signature of the `on` method.\n */\nexport type Subscriber<Events: {} = {}> = <Name: $Keys<Events>>(\n  name: Name,\n  f: (v: $ElementType<Events, Name>) => mixed\n) => CallbackRemover\n\n// No user-supplied value will ever be identical to this.\nexport const dirtyValue = {}\n\n/**\n * Subscribes to an event on a bridgeable object.\n */\nexport function addListener(\n  o: Object,\n  name: string,\n  f: Function\n): CallbackRemover {\n  const { closed, listeners } = getInstanceMagic(o)\n\n  if (closed) return () => {}\n  if (listeners[name] == null) listeners[name] = [f]\n  else listeners[name].push(f)\n\n  return function unsubscribe() {\n    listeners[name] = listeners[name].filter(i => i !== f)\n  }\n}\n\n/**\n * Subscribes to property changes on a bridgeable object.\n */\nexport function addWatcher(\n  o: Object,\n  name: string,\n  f: Function\n): CallbackRemover {\n  const { closed, watchers } = getInstanceMagic(o)\n\n  // Don't catch access errors, since we want the user to see them:\n  const data = o[name]\n\n  if (closed) return () => {}\n  if (watchers[name] == null) watchers[name] = { data, fs: [f] }\n  else watchers[name].fs.push(f)\n\n  return function unsubscribe() {\n    watchers[name].fs = watchers[name].fs.filter(i => i !== f)\n  }\n}\n\n/**\n * Destroys a proxy.\n * The remote client will completely forget about this object,\n * and accessing it will become an error.\n */\nexport function close(o: Object): mixed {\n  const magic = getInstanceMagic(o)\n\n  // Call local callbacks:\n  const listeners = magic.listeners.close\n  if (listeners != null) {\n    for (const f of listeners) {\n      callCallback(o, f, undefined, true)\n    }\n  }\n\n  magic.closed = true\n  for (const bridge of magic.bridges) {\n    bridge.emitClose(magic.localId)\n  }\n  magic.bridges = []\n  magic.listeners = {}\n  magic.watchers = {}\n}\n\n/**\n * Emits an event on a bridgeable object.\n */\nexport function emit(o: Object, name: string, payload: mixed): mixed {\n  const magic = getInstanceMagic(o)\n  if (magic.closed) throw new Error('Cannot emit event on closed object')\n\n  // Schedule outgoing event messages:\n  for (const bridge of magic.bridges) {\n    bridge.emitEvent(magic.localId, name, payload)\n  }\n\n  // Call local callbacks:\n  const listeners = magic.listeners[name]\n  if (listeners != null) {\n    for (const f of listeners) {\n      callCallback(o, f, payload, name !== 'error')\n    }\n  }\n}\n\n/**\n * Marks an object as having changes. The proxy server will send an update.\n */\nexport function update<T: {}>(o: T, name?: $Keys<T>): mixed {\n  const magic = getInstanceMagic(o)\n  if (magic.closed) throw new Error('Cannot update closed object')\n\n  for (const bridge of magic.bridges) {\n    bridge.markDirty(magic.localId, name)\n  }\n\n  // Blow away the cache if we have a name:\n  if (name != null && magic.watchers[name] != null) {\n    magic.watchers[name].data = dirtyValue\n  }\n\n  // Call watcher callbacks:\n  for (const n in magic.watchers) {\n    const cache = magic.watchers[n]\n    try {\n      const data = o[n]\n      if (data !== cache.data) {\n        cache.data = data\n        for (const f of cache.fs) callCallback(o, f, cache.data, true)\n      }\n    } catch (e) {}\n  }\n}\n\n/**\n * Calls a user-supplied callback function with error checking.\n */\nexport function callCallback(\n  o: Object,\n  f: Function,\n  payload: mixed,\n  emitError: boolean\n) {\n  try {\n    const out = f(payload)\n\n    // If the function returns a promise, emit an error if it rejects:\n    if (emitError && out != null && typeof out.then === 'function') {\n      out.then(undefined, e => emit(o, 'error', e))\n    }\n  } catch (e) {\n    if (emitError) emit(o, 'error', e)\n  }\n}\n","// @flow\n/**\n * @file\n * Routines for breaking bridgeable objects into messages,\n * and then restoring those messages into proxies on the other side.\n */\n\nimport { packData, packThrow, unpackData } from './data.js'\nimport {\n  type ProxyMagic,\n  getInstanceMagic,\n  MAGIC_KEY,\n  makeProxyMagic\n} from './magic.js'\nimport type { CreateMessage, PackedProps } from './protocol.js'\nimport type { BridgeState } from './state.js'\n\nexport type ValueCache = { [name: string]: mixed }\n\n// No user-supplied value will ever be identical to this.\nexport const dirtyValue = {}\n\n/**\n * Examines a bridgeable object and prepares it for sending of the wire.\n * Returns a creation method an the initial value cache.\n */\nexport function packObject(\n  state: BridgeState,\n  o: Object\n): {\n  cache: ValueCache,\n  create: CreateMessage\n} {\n  // Iterate the prototype chain, looking for property names:\n  const allNames: { [name: string]: true } = {}\n  const end = Object.prototype\n  for (let p = o; p !== end && p != null; p = Object.getPrototypeOf(p)) {\n    for (const name of Object.getOwnPropertyNames(p)) {\n      if (name !== MAGIC_KEY && !/^_/.test(name) && name !== 'constructor') {\n        allNames[name] = true\n      }\n    }\n  }\n\n  // Iterate over the object's properties and add their names to\n  // the method list or the value cache.\n  const cache: ValueCache = {}\n  const methods: Array<string> = []\n  const props: PackedProps = {}\n  for (const n in allNames) {\n    try {\n      const data = o[n]\n      if (\n        typeof data === 'function' &&\n        (data[MAGIC_KEY] == null || data[MAGIC_KEY].shareId == null)\n      ) {\n        methods.push(n)\n      } else {\n        cache[n] = data\n        props[n] = packData(state, data)\n      }\n    } catch (e) {\n      cache[n] = dirtyValue\n      props[n] = packThrow(state, e)\n    }\n  }\n\n  const { localId } = getInstanceMagic(o)\n  const create: CreateMessage = { localId, methods, props }\n  return { cache, create }\n}\n\n/**\n * Checks an object for changes.\n * Updates the cache, and returns an object with the necessary changes.\n */\nexport function diffObject(\n  state: BridgeState,\n  o: Object,\n  cache: ValueCache\n): { dirty: boolean, props: PackedProps } {\n  let dirty = false\n  const props: PackedProps = {}\n\n  for (const n in cache) {\n    try {\n      const value = o[n]\n      if (value !== cache[n]) {\n        dirty = true\n        props[n] = packData(state, value)\n        cache[n] = value\n      }\n    } catch (e) {\n      props[n] = packThrow(state, e)\n      cache[n] = dirtyValue\n    }\n  }\n\n  return { dirty, props }\n}\n\n/**\n * Creates an object proxy.\n * The object will have the same values and methods as the original,\n * but will send everything over the bridge.\n */\nexport function makeProxy(state: BridgeState, create: CreateMessage): Object {\n  const props = {}\n\n  // Make the magic property descriptor:\n  const magic = makeProxyMagic(create.localId)\n  props[MAGIC_KEY] = { value: magic }\n\n  // Add the getters:\n  for (const n in create.props) {\n    props[n] = { enumerable: true, get: makeProxyGetter(magic, n) }\n  }\n\n  // Add the methods:\n  for (const n of create.methods) {\n    props[n] = { value: makeProxyMethod(state, magic, n) }\n  }\n\n  // Make the object:\n  return Object.create(Object.prototype, props)\n}\n\n/**\n * Unpacks a proxy's properties into the magic storage area.\n */\nexport function updateObjectProps(\n  state: BridgeState,\n  o: Object,\n  props: PackedProps\n): mixed {\n  const magic: ProxyMagic = o[MAGIC_KEY]\n\n  for (const n in props) {\n    try {\n      magic.props[n] = unpackData(state, props[n], n)\n      magic.errors[n] = false\n    } catch (e) {\n      magic.props[n] = e\n      magic.errors[n] = true\n    }\n  }\n}\n\nfunction makeProxyGetter(magic: ProxyMagic, name: string) {\n  return function get() {\n    if (magic.errors[name]) throw magic.props[name]\n    return magic.props[name]\n  }\n}\n\nfunction makeProxyMethod(state: BridgeState, magic: ProxyMagic, name: string) {\n  return function method(...args) {\n    if (magic.closed) {\n      return Promise.reject(\n        new TypeError(`Cannot call method '${name}' of closed proxy`)\n      )\n    }\n    return state.emitCall(magic.remoteId, name, args)\n  }\n}\n","/* global setTimeout */\n// @flow\n\nimport type { BridgeOptions, SendMessage } from './bridge.js'\nimport { type ObjectTable, packData, packThrow, unpackData } from './data.js'\nimport { bridgifyClass, getInstanceMagic } from './magic.js'\nimport { close, emit, update } from './manage.js'\nimport {\n  type ValueCache,\n  diffObject,\n  dirtyValue,\n  makeProxy,\n  packObject,\n  updateObjectProps\n} from './objects.js'\nimport type {\n  CallMessage,\n  ChangeMessage,\n  CreateMessage,\n  EventMessage,\n  Message,\n  ReturnMessage\n} from './protocol.js'\n\nexport class BridgeState implements ObjectTable {\n  // Objects:\n  +proxies: { [objectId: number]: Object }\n  +objects: { [localId: number]: Object }\n  +caches: { [localId: number]: ValueCache }\n\n  // Outgoing method calls:\n  nextCallId: number\n  pendingCalls: {\n    [callId: number]: { name: string, resolve: Function, reject: Function }\n  }\n\n  // Pending message:\n  dirty: { [localId: number]: { cache: ValueCache, object: Object } }\n  message: Message\n\n  // Update scheduling:\n  closed: boolean\n  +throttleMs: number\n  lastUpdate: number\n  sendPending: boolean\n  +sendMessage: SendMessage\n\n  constructor(opts: BridgeOptions) {\n    const { sendMessage, throttleMs = 0 } = opts\n\n    // Objects:\n    this.proxies = {}\n    this.objects = {}\n    this.caches = {}\n\n    // Outgoing method calls:\n    this.nextCallId = 0\n    this.pendingCalls = {}\n\n    // Pending message:\n    this.dirty = {}\n    this.message = {}\n\n    // Update scheduling:\n    this.throttleMs = throttleMs\n    this.lastUpdate = 0\n    this.sendPending = false\n    this.sendMessage = sendMessage\n  }\n\n  /**\n   * Close the bridge, so it will no longer send messages.\n   * This also closes all proxies created by the bridge and rejects\n   * all pending calls.\n   */\n  close(error: Error) {\n    for (const callId in this.pendingCalls) {\n      const call = this.pendingCalls[Number(callId)]\n      call.reject(error)\n    }\n    for (const objectId in this.proxies) {\n      close(this.proxies[Number(objectId)])\n    }\n    this.closed = true\n  }\n\n  /**\n   * Grabs an object by its proxy id.\n   */\n  getObject(packedId: number): Object | void {\n    return packedId < 0 ? this.proxies[-packedId] : this.objects[packedId]\n  }\n\n  /**\n   * Returns an object's id relative to this bridge.\n   * The id is positive for objects created on this side of the bridge,\n   * and negative for proxy objects reflecting things on the other side.\n   */\n  getPackedId(o: Object): number | null {\n    const magic = getInstanceMagic(o)\n    if (magic.closed) return null\n    if (magic.remoteId != null && this.proxies[magic.remoteId] != null) {\n      return -magic.remoteId\n    }\n    if (this.objects[magic.localId] == null) {\n      // Add unknown objects to the bridge:\n      this.objects[magic.localId] = o\n\n      const { cache, create } = packObject(this, o)\n      this.caches[magic.localId] = cache\n      magic.bridges.push(this)\n      this.emitCreate(create, o)\n    }\n    return magic.localId\n  }\n\n  /**\n   * Marks an object as needing changes.\n   */\n  markDirty(localId: number, name?: string): void {\n    const cache = this.caches[localId]\n    if (name != null && name in cache) cache[name] = dirtyValue\n\n    this.dirty[localId] = { cache, object: this.objects[localId] }\n    this.wakeup()\n  }\n\n  /**\n   * Marks an object as being deleted.\n   */\n  emitClose(localId: number): void {\n    delete this.objects[localId]\n    delete this.caches[localId]\n    if (this.message.closed == null) this.message.closed = []\n    this.message.closed.push(localId)\n    this.wakeup()\n  }\n\n  /**\n   * Attaches an object to this bridge, sending a creation message.\n   */\n  emitCreate(create: CreateMessage, o: Object): void {\n    if (this.message.created == null) this.message.created = []\n    this.message.created.push(create)\n    // this.wakeup() not needed, since this is part of data packing.\n  }\n\n  /**\n   * Enqueues a proxy call message.\n   */\n  emitCall(remoteId: number, name: string, args: mixed): Promise<mixed> {\n    const callId = this.nextCallId++\n    const message: CallMessage = {\n      callId,\n      remoteId,\n      name,\n      ...packData(this, args)\n    }\n    if (this.message.calls == null) this.message.calls = []\n    this.message.calls.push(message)\n    this.wakeup()\n\n    return new Promise((resolve, reject) => {\n      this.pendingCalls[callId] = { name, resolve, reject }\n    })\n  }\n\n  /**\n   * Enqueues an event message.\n   */\n  emitEvent(localId: number, name: string, payload: mixed): void {\n    const message: EventMessage = {\n      localId,\n      name,\n      ...packData(this, payload)\n    }\n    if (this.message.events == null) this.message.events = []\n    this.message.events.push(message)\n    this.wakeup()\n  }\n\n  /**\n   * Enqueues a function return message.\n   */\n  emitReturn(callId: number, fail: boolean, value: mixed): void {\n    const message: ReturnMessage = {\n      callId,\n      ...(fail ? packThrow(this, value) : packData(this, value))\n    }\n    if (this.message.returns == null) this.message.returns = []\n    this.message.returns.push(message)\n    this.wakeup()\n  }\n\n  /**\n   * Handles an incoming message,\n   * updating state and triggering side-effects as needed.\n   */\n  handleMessage(message: Message): void {\n    // ----------------------------------------\n    // Phase 1: Get our proxies up to date.\n    // ----------------------------------------\n\n    // Handle newly-created objects:\n    if (message.created) {\n      // Pass 1: Create proxies for the new objects:\n      for (const create of message.created) {\n        this.proxies[create.localId] = makeProxy(this, create)\n      }\n\n      // Pass 2: Fill in the values:\n      for (const create of message.created) {\n        updateObjectProps(this, this.proxies[create.localId], create.props)\n      }\n    }\n\n    // Handle updated objects:\n    if (message.changed) {\n      // Pass 1: Update all the proxies:\n      for (const change of message.changed) {\n        const { localId, props } = change\n        const o = this.proxies[localId]\n        if (o == null) {\n          throw new RangeError(`Invalid localId ${localId}`)\n        }\n        updateObjectProps(this, o, props)\n      }\n\n      // Pass 2: Fire the callbacks:\n      for (const change of message.changed) {\n        update(this.proxies[change.localId])\n      }\n    }\n\n    // ----------------------------------------\n    // Phase 2: Handle events & method calls\n    // ----------------------------------------\n\n    // Handle events:\n    if (message.events) {\n      for (const event of message.events) {\n        const { localId, name } = event\n        const o = localId === 0 ? this : this.proxies[localId]\n        if (o == null) continue\n        try {\n          emit(o, name, unpackData(this, event, name))\n        } catch (e) {\n          emit(o, 'error', e) // Payload unpacking problem\n        }\n      }\n    }\n\n    // Handle method calls:\n    if (message.calls) {\n      for (const call of message.calls) {\n        const { callId, remoteId, name } = call\n\n        try {\n          const o = this.objects[remoteId]\n          if (o == null) {\n            throw new TypeError(\n              `Cannot call method '${name}' of closed proxy (remote)`\n            )\n          }\n          if (typeof o[name] !== 'function') {\n            throw new TypeError(`'${name}' is not a function`)\n          }\n          const args = unpackData(this, call, `${name}.arguments`)\n          Promise.resolve(o[name].apply(o, args)).then(\n            value => this.emitReturn(callId, false, value),\n            e => this.emitReturn(callId, true, e)\n          )\n        } catch (e) {\n          this.emitReturn(callId, true, e)\n        }\n      }\n    }\n\n    // Handle method returns:\n    if (message.returns) {\n      for (const ret of message.returns) {\n        const { callId } = ret\n        const pendingCall = this.pendingCalls[callId]\n        if (pendingCall == null) {\n          throw new RangeError(`Invalid callId ${callId}`)\n        }\n        try {\n          pendingCall.resolve(\n            unpackData(this, ret, `${pendingCall.name}.return`)\n          )\n        } catch (e) {\n          pendingCall.reject(e)\n        } finally {\n          delete this.pendingCalls[callId]\n        }\n      }\n    }\n\n    // ----------------------------------------\n    // Phase 3: Clean up closed objects\n    // ----------------------------------------\n\n    if (message.closed) {\n      for (const localId of message.closed) {\n        const o = this.proxies[localId]\n        if (o == null) return\n        delete this.proxies[localId]\n        close(o)\n      }\n    }\n  }\n\n  /**\n   * Sends the current message.\n   */\n  sendNow(): void {\n    if (this.closed) return\n\n    // Build change messages:\n    for (const id in this.dirty) {\n      const localId = Number(id)\n      const { object, cache } = this.dirty[localId]\n      const { dirty, props } = diffObject(this, object, cache)\n      if (dirty) {\n        const message: ChangeMessage = { localId, props }\n        if (this.message.changed == null) this.message.changed = []\n        this.message.changed.push(message)\n      }\n    }\n\n    const message = this.message\n    this.dirty = {}\n    this.message = {}\n    this.sendMessage(message)\n  }\n\n  /**\n   * Something has changed, so prepare to send the pending message:\n   */\n  wakeup(): void {\n    if (this.sendPending) return\n\n    this.sendPending = true\n    const task = () => {\n      this.sendPending = false\n      this.lastUpdate = Date.now()\n      this.sendNow()\n    }\n\n    // We really do want `setTimeout` here, even if the delay is 0,\n    // since promises and other micro tasks should fire first.\n    const delay = this.lastUpdate + this.throttleMs - Date.now()\n    setTimeout(task, delay < 0 ? 0 : delay)\n  }\n}\n\nbridgifyClass(BridgeState)\n","// @flow\n\nimport { packData, unpackData } from './data.js'\nimport { addListener } from './manage.js'\nimport { type Message } from './protocol.js'\nimport { BridgeState } from './state.js'\n\n/**\n * The bridge sends messages using this function.\n */\nexport type SendMessage = (message: Object) => mixed\n\n/**\n * Options used to create a new bridge.\n */\nexport type BridgeOptions = {\n  sendMessage: SendMessage,\n  throttleMs?: number\n}\n\n/**\n * Options used to create a new local bridge.\n */\nexport type LocalBridgeOptions = {\n  cloneMessage?: (x: Object) => Object,\n  throttleMs?: number\n}\n\n/**\n * An object bridge.\n */\nexport class Bridge {\n  +_state: BridgeState\n  +_rootPromise: Promise<Object>\n\n  constructor(opts: BridgeOptions) {\n    this._state = new BridgeState(opts)\n    this._rootPromise = new Promise(resolve =>\n      addListener(this._state, 'root', resolve)\n    )\n  }\n\n  handleMessage(message: Message): mixed {\n    this._state.handleMessage(message)\n  }\n\n  getRoot() {\n    return this._rootPromise\n  }\n\n  sendRoot(root: Object) {\n    this._state.emitEvent(0, 'root', root)\n  }\n\n  close(error: Error) {\n    this._state.close(error)\n  }\n}\n\n/**\n * Bridges a single object locally. 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+{"version":3,"file":"yaob.js","sources":["../src/magic.js","../src/data.js","../src/manage.js","../src/objects.js","../src/state.js","../src/bridge.js","../src/bridgeable.js"],"sourcesContent":["// @flow\n/**\n * @file\n * Bridgeable objects have a special \"magic\" property.\n * This file contains routines for working with these magic properties.\n */\n\nimport type { BridgeState } from './state.js'\n\n// An object is bridgeable if it has this key:\nexport const MAGIC_KEY = '_yaob'\n\n/**\n * Magic data used to mark classes as bridgeable.\n */\nexport type ClassMagic = {}\n\n/**\n * Magic data shared by all object instances.\n */\ntype ObjectMagic = {\n  // The object id on this side of the bridge:\n  +localId: number,\n\n  // The object is no longer bridgeable when set:\n  closed?: true,\n\n  // Bridges subscribed to this object:\n  bridges: Array<BridgeState>,\n\n  // Event listeners subscribed to this object:\n  listeners: { [name: string]: Array<Function> },\n\n  // Property watchers subscribed to this object:\n  watchers: { [name: string]: { data: mixed, fs: Array<Function> } }\n}\n\n/**\n * Magic data found on user-facing object instances.\n */\nexport type InstanceMagic = ObjectMagic & {\n  // This is a proxy object if set. See ProxyMagic for other properties:\n  +remoteId?: number\n}\n\n/**\n * Magic data found on proxy objects.\n */\nexport type ProxyMagic = ObjectMagic & {\n  +remoteId: number,\n\n  // True if the property getter should throw the value:\n  +errors: { [name: string]: boolean },\n\n  // Values for property getters to return:\n  +props: { [name: string]: mixed }\n}\n\n/**\n * Magic data found on shared props.\n */\nexport type SharedMagic = {\n  +shareId: string\n}\n\nlet nextLocalId = 1\nexport const sharedData: { [sharedId: string]: mixed } = {}\n\n/**\n * Adds or updates an object's magic data.\n */\nfunction addMagic(o: Object, magic: ClassMagic | ObjectMagic | SharedMagic) {\n  if (Object.prototype.hasOwnProperty.call(o, MAGIC_KEY)) {\n    Object.assign(o[MAGIC_KEY], magic)\n  } else {\n    Object.defineProperty(o, MAGIC_KEY, { value: magic })\n  }\n}\n\n/**\n * Makes a class bridgeable, including anything derived from it.\n */\nexport function bridgifyClass<Type: Function>(Class: Type): Type {\n  const o = Class.prototype\n  if (!Object.prototype.hasOwnProperty.call(o, MAGIC_KEY)) {\n    const magic: ClassMagic = {}\n    addMagic(o, magic)\n  }\n  return Class\n}\n\n/**\n * Makes an object instance bridgeable.\n */\nexport function bridgifyObject<Type: Object>(o: Type): Type {\n  if (\n    !Object.prototype.hasOwnProperty.call(o, MAGIC_KEY) ||\n    o[MAGIC_KEY].localId == null\n  ) {\n    const magic: InstanceMagic = {\n      localId: nextLocalId++,\n      bridges: [],\n      listeners: {},\n      watchers: {}\n    }\n    addMagic(o, magic)\n  }\n  return o\n}\n\n/**\n * Gets the magic data from an object instance.\n */\nexport function getInstanceMagic(o: Object): InstanceMagic {\n  // We only want to look at bridgeable objects:\n  if (o[MAGIC_KEY] == null) throw new TypeError('Not a bridgeable object')\n\n  bridgifyObject(o)\n  return o[MAGIC_KEY]\n}\n\n/**\n * Creates a new `ProxyMagic` object.\n */\nexport function makeProxyMagic(remoteId: number): ProxyMagic {\n  return {\n    // InstanceMagic:\n    localId: nextLocalId++,\n    bridges: [],\n    listeners: {},\n    watchers: {},\n    // ProxyMagic:\n    remoteId,\n    errors: {},\n    props: {}\n  }\n}\n\n/**\n * Adds items to the global shared data table.\n */\nexport function shareData(\n  table: { [name: string]: Object },\n  namespace?: string\n) {\n  if (namespace == null) namespace = ''\n  else namespace += '.'\n\n  for (const n of Object.getOwnPropertyNames(table)) {\n    const shareId = namespace + n\n    if (sharedData[shareId] != null) {\n      throw new Error(`A shared value named ${shareId} already exists`)\n    }\n    sharedData[shareId] = table[n]\n    addMagic(table[n], { shareId })\n  }\n}\n","// @flow\n/**\n * @file\n * Routines for breaking primitive values into messages,\n * and then restoring those messages into values on the other side.\n */\n\nimport { base64 } from 'rfc4648'\n\nimport { MAGIC_KEY, sharedData } from './magic.js'\n\n/**\n * The data-packing system uses this interface to turn\n * bridgeable objects into packedId's and vice-versa.\n */\nexport interface ObjectTable {\n  getPackedId(o: Object): number | null;\n  getObject(packedId: number): Object | void;\n}\n\n/**\n * The bridge tries to send values as-is, but that isn't always possible.\n * If this data structure is non-null, the strings indicate what changes\n * need to take place to the value. This data structure is recursive,\n * so it matches the \"shape\" of the value.\n */\nexport type DataMap =\n  | { +[name: string]: DataMap }\n  | Array<DataMap>\n  | '' // No change\n  | '?' // Invalid value\n  | 'd' // Date\n  | 'e' // Error\n  | 'o' // Object\n  | 's' // Shared data\n  | 'u' // Undefined\n  | 'ab' // ArrayBuffer\n  | 'u8' // Uint8Array\n\n/**\n * A pure JSON value type.\n */\nexport type JsonValue =\n  | { +[name: string]: JsonValue }\n  | Array<JsonValue>\n  | false\n  | null\n  | number\n  | string\n  | true\n\n/**\n * A value for sending over the wire.\n * If the `value` needs to be modified on the client side,\n * those modifications are in the `map` structure.\n * If this value was thrown, `throw` will be true.\n */\nexport type PackedData = {\n  +map?: DataMap,\n  +raw: JsonValue,\n  +throw?: true\n}\n\n/**\n * The bridge turns errors into these objects.\n */\nexport type PackedError = {\n  +base: string | null\n} & PackedData // Object properties\n\n/**\n * Prepares a value for sending over the wire.\n */\nexport function packData(table: ObjectTable, data: mixed): PackedData {\n  try {\n    const map = mapData(table, data)\n    const raw = packItem(table, map, data)\n    return map !== '' ? { map, raw } : { raw }\n  } catch (data) {\n    return packThrow(table, data)\n  }\n}\n\n/**\n * Prepares a thrown value for sending over the wire.\n */\nexport function packThrow(table: ObjectTable, data: mixed): PackedData {\n  const map = mapData(table, data)\n  const raw = packItem(table, map, data)\n  return { map, raw, throw: true }\n}\n\n/**\n * Restores a value that has been sent over the wire.\n */\nexport function unpackData(\n  table: ObjectTable,\n  data: PackedData,\n  path: string\n): any {\n  const { map, raw } = data\n  const out = map != null ? unpackItem(table, map, raw, path) : raw\n  if (data.throw) throw out\n  return out\n}\n\n/**\n * Searches through a value, looking for data we can't send directly.\n * Returns a map showing where fixes need to take place.\n */\nfunction mapData(table: ObjectTable, data: mixed): DataMap {\n  switch (typeof data) {\n    case 'boolean':\n    case 'number':\n    case 'string':\n      return ''\n\n    case 'object': {\n      if (data === null) return ''\n      if (data instanceof Date) return 'd'\n      if (data instanceof Error) return 'e'\n      if (data instanceof ArrayBuffer) return 'ab'\n      if (data instanceof Uint8Array) return 'u8'\n      if (data[MAGIC_KEY] != null) {\n        return data[MAGIC_KEY].shareId != null ? 's' : 'o'\n      }\n\n      // Arrays:\n      if (Array.isArray(data)) {\n        let out: Array<DataMap> | '' = ''\n        for (let i = 0; i < data.length; ++i) {\n          const map = mapData(table, data[i])\n          if (map !== '' && out === '') {\n            out = []\n            for (let j = 0; j < i; ++j) out[j] = ''\n          }\n          if (out !== '') out[i] = map\n        }\n        return out\n      }\n\n      // Data objects:\n      let out: { [name: string]: DataMap } | '' = ''\n      for (const n in data) {\n        const map = mapData(table, data[n])\n        if (map !== '') {\n          if (out === '') out = {}\n          out[n] = map\n        }\n      }\n      return out\n    }\n\n    case 'undefined':\n      return 'u'\n\n    case 'function':\n      // $FlowFixMe - MAGIC_KEY isn't a known property here\n      return data[MAGIC_KEY] != null && data[MAGIC_KEY].shareId != null\n        ? 's'\n        : '?'\n\n    default:\n      return '?'\n  }\n}\n\n/**\n * Breaks down an error object into a JSON representation.\n */\nfunction packError(table: ObjectTable, o: Object): PackedError {\n  // Grab the properties off the object:\n  const { message, stack } = o\n  const props = { message, stack, ...o }\n\n  let base = null\n  if (o instanceof EvalError) base = 'EvalError'\n  else if (o instanceof RangeError) base = 'RangeError'\n  else if (o instanceof ReferenceError) base = 'ReferenceError'\n  else if (o instanceof SyntaxError) base = 'SyntaxError'\n  else if (o instanceof TypeError) base = 'TypeError'\n  else if (o instanceof URIError) base = 'URIError'\n\n  // Build the JSON value:\n  return { base, ...packData(table, props) }\n}\n\n/**\n * Copies a value, removing any API objects identified in the types.\n */\nfunction packItem(table: ObjectTable, map: DataMap, data: any): JsonValue {\n  switch (map) {\n    case '':\n      return data\n\n    case '?':\n      return typeof data\n\n    case 'd':\n      return data.toISOString()\n\n    case 'e':\n      return packError(table, data)\n\n    case 'o':\n      return table.getPackedId(data)\n\n    case 's':\n      return data[MAGIC_KEY].shareId\n\n    case 'u':\n      return null\n\n    case 'ab':\n      return base64.stringify(new Uint8Array(data))\n\n    case 'u8':\n      return base64.stringify(data)\n\n    default: {\n      // Arrays:\n      if (Array.isArray(map)) {\n        const out = []\n        for (let i = 0; i < map.length; ++i) {\n          out[i] = packItem(table, map[i], data[i])\n        }\n        return out\n      }\n\n      // Objects:\n      const out = {}\n      for (const n in data) {\n        out[n] = n in map ? packItem(table, map[n], data[n]) : data[n]\n      }\n      return out\n    }\n  }\n}\n\n/**\n * Restores an error object from its JSON representation.\n */\nfunction unpackError(\n  table: ObjectTable,\n  value: PackedError,\n  path: string\n): Error {\n  const bases = {\n    EvalError,\n    RangeError,\n    ReferenceError,\n    SyntaxError,\n    TypeError,\n    URIError\n  }\n\n  // Make the object:\n  const Base = value.base != null ? bases[value.base] || Error : Error\n  const out: Object = new Base()\n\n  // Restore the properties:\n  const props = unpackData(table, value, path)\n  for (const n in props) out[n] = props[n]\n\n  return out\n}\n\n/**\n * Restores a value that has been sent over the wire.\n */\nfunction unpackItem(\n  table: ObjectTable,\n  map: DataMap,\n  raw: any,\n  path: string\n): any {\n  switch (map) {\n    case '':\n      return raw\n\n    case '?': {\n      const type = typeof raw === 'string' ? raw : '?'\n      throw new TypeError(`Unsupported value of type ${type} at ${path}`)\n    }\n\n    case 'd':\n      return new Date(raw)\n\n    case 'e':\n      if (typeof raw !== 'object' || raw === null) {\n        throw new TypeError(`Expecting an error description at ${path}`)\n      }\n      return unpackError(table, raw, path)\n\n    case 'o': {\n      if (raw === null) {\n        throw new TypeError(`Closed bridge object at ${path}`)\n      }\n      if (typeof raw !== 'number') {\n        throw new TypeError(`Expecting a packedId at ${path}`)\n      }\n      const o = table.getObject(-raw)\n      if (o == null) throw new RangeError(`Invalid packedId ${raw} at ${path}`)\n      return o\n    }\n\n    case 's': {\n      if (typeof raw !== 'string') {\n        throw new TypeError(`Expecting a shareId at ${path}`)\n      }\n      const s = sharedData[raw]\n      if (s == null) throw new RangeError(`Invalid shareId '${raw}' at ${path}`)\n      return s\n    }\n\n    case 'u':\n      return undefined\n\n    case 'ab':\n      if (typeof raw !== 'string') {\n        throw new TypeError(`Expecting a base64 string at ${path}`)\n      }\n      return base64.parse(raw).buffer\n\n    case 'u8':\n      if (typeof raw !== 'string') {\n        throw new TypeError(`Expecting a base64 string at ${path}`)\n      }\n      return base64.parse(raw)\n\n    default: {\n      if (typeof map !== 'object' || map === null) {\n        throw new TypeError(`Invalid type information ${map} at ${path}`)\n      }\n      if (typeof raw !== 'object' || raw === null) {\n        throw new TypeError(`Expecting an array or object at ${path}`)\n      }\n\n      // Arrays:\n      if (Array.isArray(map)) {\n        if (!Array.isArray(raw)) {\n          throw new TypeError(`Expecting an array at ${path}`)\n        }\n        const out = []\n        for (let i = 0; i < map.length; ++i) {\n          out[i] = unpackItem(table, map[i], raw[i], `${path}[${i}]`)\n        }\n        return out\n      }\n\n      // Objects:\n      const out = {}\n      for (const n in raw) {\n        out[n] =\n          n in map ? unpackItem(table, map[n], raw[n], `${path}.${n}`) : raw[n]\n      }\n      return out\n    }\n  }\n}\n","// @flow\n/**\n * @file\n * Functions for managing updates, events, and object lifetime.\n */\n\nimport { getInstanceMagic } from './magic.js'\n\n/**\n * Undoes the effect of `on`.\n */\nexport type CallbackRemover = () => mixed\n\n/**\n * Signature of the `on` method.\n */\nexport type Subscriber<Events: {} = {}> = <Name: $Keys<Events>>(\n  name: Name,\n  f: (v: $ElementType<Events, Name>) => mixed\n) => CallbackRemover\n\n// No user-supplied value will ever be identical to this.\nexport const dirtyValue = {}\n\n/**\n * Subscribes to an event on a bridgeable object.\n */\nexport function addListener(\n  o: Object,\n  name: string,\n  f: Function\n): CallbackRemover {\n  const { closed, listeners } = getInstanceMagic(o)\n\n  if (closed) return () => {}\n  if (listeners[name] == null) listeners[name] = [f]\n  else listeners[name].push(f)\n\n  return function unsubscribe() {\n    listeners[name] = listeners[name].filter(i => i !== f)\n  }\n}\n\n/**\n * Subscribes to property changes on a bridgeable object.\n */\nexport function addWatcher(\n  o: Object,\n  name: string,\n  f: Function\n): CallbackRemover {\n  const { closed, watchers } = getInstanceMagic(o)\n\n  // Don't catch access errors, since we want the user to see them:\n  const data = o[name]\n\n  if (closed) return () => {}\n  if (watchers[name] == null) watchers[name] = { data, fs: [f] }\n  else watchers[name].fs.push(f)\n\n  return function unsubscribe() {\n    watchers[name].fs = watchers[name].fs.filter(i => i !== f)\n  }\n}\n\n/**\n * Destroys a proxy.\n * The remote client will completely forget about this object,\n * and accessing it will become an error.\n */\nexport function close(o: Object): mixed {\n  const magic = getInstanceMagic(o)\n\n  // Call local callbacks:\n  const listeners = magic.listeners.close\n  if (listeners != null) {\n    for (const f of listeners) {\n      callCallback(o, f, undefined, true)\n    }\n  }\n\n  magic.closed = true\n  for (const bridge of magic.bridges) {\n    bridge.emitClose(magic.localId)\n  }\n  magic.bridges = []\n  magic.listeners = {}\n  magic.watchers = {}\n}\n\n/**\n * Emits an event on a bridgeable object.\n */\nexport function emit(o: Object, name: string, payload: mixed): mixed {\n  const magic = getInstanceMagic(o)\n  if (magic.closed) throw new Error('Cannot emit event on closed object')\n\n  // Schedule outgoing event messages:\n  for (const bridge of magic.bridges) {\n    bridge.emitEvent(magic.localId, name, payload)\n  }\n\n  // Call local callbacks:\n  const listeners = magic.listeners[name]\n  if (listeners != null) {\n    for (const f of listeners) {\n      callCallback(o, f, payload, name !== 'error')\n    }\n  }\n}\n\n/**\n * Marks an object as having changes. The proxy server will send an update.\n */\nexport function update<T: {}>(o: T, name?: $Keys<T>): mixed {\n  const magic = getInstanceMagic(o)\n  if (magic.closed) throw new Error('Cannot update closed object')\n\n  for (const bridge of magic.bridges) {\n    bridge.markDirty(magic.localId, name)\n  }\n\n  // Blow away the cache if we have a name:\n  if (name != null && magic.watchers[name] != null) {\n    magic.watchers[name].data = dirtyValue\n  }\n\n  // Call watcher callbacks:\n  for (const n in magic.watchers) {\n    const cache = magic.watchers[n]\n    try {\n      const data = o[n]\n      if (data !== cache.data) {\n        cache.data = data\n        for (const f of cache.fs) callCallback(o, f, cache.data, true)\n      }\n    } catch (e) {}\n  }\n}\n\n/**\n * Calls a user-supplied callback function with error checking.\n */\nexport function callCallback(\n  o: Object,\n  f: Function,\n  payload: mixed,\n  emitError: boolean\n) {\n  try {\n    const out = f(payload)\n\n    // If the function returns a promise, emit an error if it rejects:\n    if (emitError && out != null && typeof out.then === 'function') {\n      out.then(undefined, e => emit(o, 'error', e))\n    }\n  } catch (e) {\n    if (emitError) emit(o, 'error', e)\n  }\n}\n","// @flow\n/**\n * @file\n * Routines for breaking bridgeable objects into messages,\n * and then restoring those messages into proxies on the other side.\n */\n\nimport { packData, packThrow, unpackData } from './data.js'\nimport {\n  type ProxyMagic,\n  getInstanceMagic,\n  MAGIC_KEY,\n  makeProxyMagic\n} from './magic.js'\nimport type { CreateMessage, PackedProps } from './protocol.js'\nimport type { BridgeState } from './state.js'\n\nexport type ValueCache = { [name: string]: mixed }\n\n// No user-supplied value will ever be identical to this.\nexport const dirtyValue = {}\n\n/**\n * Examines a bridgeable object and prepares it for sending of the wire.\n * Returns a creation method an the initial value cache.\n */\nexport function packObject(\n  state: BridgeState,\n  o: Object\n): {\n  cache: ValueCache,\n  create: CreateMessage\n} {\n  // Iterate the prototype chain, looking for property names:\n  const allNames: { [name: string]: true } = {}\n  const end = Object.prototype\n  for (let p = o; p !== end && p != null; p = Object.getPrototypeOf(p)) {\n    for (const name of Object.getOwnPropertyNames(p)) {\n      if (name !== MAGIC_KEY && !/^_/.test(name) && name !== 'constructor') {\n        allNames[name] = true\n      }\n    }\n  }\n\n  // Iterate over the object's properties and add their names to\n  // the method list or the value cache.\n  const cache: ValueCache = {}\n  const methods: Array<string> = []\n  const props: PackedProps = {}\n  for (const n in allNames) {\n    try {\n      const data = o[n]\n      if (\n        typeof data === 'function' &&\n        (data[MAGIC_KEY] == null || data[MAGIC_KEY].shareId == null)\n      ) {\n        methods.push(n)\n      } else {\n        cache[n] = data\n        props[n] = packData(state, data)\n      }\n    } catch (e) {\n      cache[n] = dirtyValue\n      props[n] = packThrow(state, e)\n    }\n  }\n\n  const { localId } = getInstanceMagic(o)\n  const create: CreateMessage = { localId, methods, props }\n  return { cache, create }\n}\n\n/**\n * Checks an object for changes.\n * Updates the cache, and returns an object with the necessary changes.\n */\nexport function diffObject(\n  state: BridgeState,\n  o: Object,\n  cache: ValueCache\n): { dirty: boolean, props: PackedProps } {\n  let dirty = false\n  const props: PackedProps = {}\n\n  for (const n in cache) {\n    try {\n      const value = o[n]\n      if (value !== cache[n]) {\n        dirty = true\n        props[n] = packData(state, value)\n        cache[n] = value\n      }\n    } catch (e) {\n      props[n] = packThrow(state, e)\n      cache[n] = dirtyValue\n    }\n  }\n\n  return { dirty, props }\n}\n\n/**\n * Creates an object proxy.\n * The object will have the same values and methods as the original,\n * but will send everything over the bridge.\n */\nexport function makeProxy(state: BridgeState, create: CreateMessage): Object {\n  const props = {}\n\n  // Make the magic property descriptor:\n  const magic = makeProxyMagic(create.localId)\n  props[MAGIC_KEY] = { value: magic }\n\n  // Add the getters:\n  for (const n in create.props) {\n    props[n] = { enumerable: true, get: makeProxyGetter(magic, n) }\n  }\n\n  // Add the methods:\n  for (const n of create.methods) {\n    props[n] = { value: makeProxyMethod(state, magic, n) }\n  }\n\n  // Make the object:\n  return Object.create(Object.prototype, props)\n}\n\n/**\n * Unpacks a proxy's properties into the magic storage area.\n */\nexport function updateObjectProps(\n  state: BridgeState,\n  o: Object,\n  props: PackedProps\n): mixed {\n  const magic: ProxyMagic = o[MAGIC_KEY]\n\n  for (const n in props) {\n    try {\n      magic.props[n] = unpackData(state, props[n], n)\n      magic.errors[n] = false\n    } catch (e) {\n      magic.props[n] = e\n      magic.errors[n] = true\n    }\n  }\n}\n\nfunction makeProxyGetter(magic: ProxyMagic, name: string) {\n  return function get() {\n    if (magic.errors[name]) throw magic.props[name]\n    return magic.props[name]\n  }\n}\n\nfunction makeProxyMethod(state: BridgeState, magic: ProxyMagic, name: string) {\n  return function method(...args) {\n    if (magic.closed) {\n      return Promise.reject(\n        new TypeError(`Cannot call method '${name}' of closed proxy`)\n      )\n    }\n    return state.emitCall(magic.remoteId, name, args)\n  }\n}\n","/* global setTimeout */\n// @flow\n\nimport type { BridgeOptions, SendMessage } from './bridge.js'\nimport { type ObjectTable, packData, packThrow, unpackData } from './data.js'\nimport { bridgifyClass, getInstanceMagic } from './magic.js'\nimport { close, emit, update } from './manage.js'\nimport {\n  type ValueCache,\n  diffObject,\n  dirtyValue,\n  makeProxy,\n  packObject,\n  updateObjectProps\n} from './objects.js'\nimport type {\n  CallMessage,\n  ChangeMessage,\n  CreateMessage,\n  EventMessage,\n  Message,\n  ReturnMessage\n} from './protocol.js'\n\nexport class BridgeState implements ObjectTable {\n  // Objects:\n  +proxies: { [objectId: number]: Object }\n  +objects: { [localId: number]: Object }\n  +caches: { [localId: number]: ValueCache }\n\n  // Outgoing method calls:\n  nextCallId: number\n  pendingCalls: {\n    [callId: number]: { name: string, resolve: Function, reject: Function }\n  }\n\n  // Pending message:\n  dirty: { [localId: number]: { cache: ValueCache, object: Object } }\n  message: Message\n\n  // Update scheduling:\n  closed: boolean\n  +throttleMs: number\n  lastUpdate: number\n  sendPending: boolean\n  +sendMessage: SendMessage\n\n  constructor(opts: BridgeOptions) {\n    const { sendMessage, throttleMs = 0 } = opts\n\n    // Objects:\n    this.proxies = {}\n    this.objects = {}\n    this.caches = {}\n\n    // Outgoing method calls:\n    this.nextCallId = 0\n    this.pendingCalls = {}\n\n    // Pending message:\n    this.dirty = {}\n    this.message = {}\n\n    // Update scheduling:\n    this.throttleMs = throttleMs\n    this.lastUpdate = 0\n    this.sendPending = false\n    this.sendMessage = sendMessage\n  }\n\n  /**\n   * Close the bridge, so it will no longer send messages.\n   * This also closes all proxies created by the bridge and rejects\n   * all pending calls.\n   */\n  close(error: Error) {\n    for (const callId in this.pendingCalls) {\n      const call = this.pendingCalls[Number(callId)]\n      call.reject(error)\n    }\n    for (const objectId in this.proxies) {\n      close(this.proxies[Number(objectId)])\n    }\n    this.closed = true\n  }\n\n  /**\n   * Grabs an object by its proxy id.\n   */\n  getObject(packedId: number): Object | void {\n    return packedId < 0 ? this.proxies[-packedId] : this.objects[packedId]\n  }\n\n  /**\n   * Returns an object's id relative to this bridge.\n   * The id is positive for objects created on this side of the bridge,\n   * and negative for proxy objects reflecting things on the other side.\n   */\n  getPackedId(o: Object): number | null {\n    const magic = getInstanceMagic(o)\n    if (magic.closed) return null\n    if (magic.remoteId != null && this.proxies[magic.remoteId] != null) {\n      return -magic.remoteId\n    }\n    if (this.objects[magic.localId] == null) {\n      // Add unknown objects to the bridge:\n      this.objects[magic.localId] = o\n\n      const { cache, create } = packObject(this, o)\n      this.caches[magic.localId] = cache\n      magic.bridges.push(this)\n      this.emitCreate(create, o)\n    }\n    return magic.localId\n  }\n\n  /**\n   * Marks an object as needing changes.\n   */\n  markDirty(localId: number, name?: string): void {\n    const cache = this.caches[localId]\n    if (name != null && name in cache) cache[name] = dirtyValue\n\n    this.dirty[localId] = { cache, object: this.objects[localId] }\n    this.wakeup()\n  }\n\n  /**\n   * Marks an object as being deleted.\n   */\n  emitClose(localId: number): void {\n    delete this.objects[localId]\n    delete this.caches[localId]\n    if (this.message.closed == null) this.message.closed = []\n    this.message.closed.push(localId)\n    this.wakeup()\n  }\n\n  /**\n   * Attaches an object to this bridge, sending a creation message.\n   */\n  emitCreate(create: CreateMessage, o: Object): void {\n    if (this.message.created == null) this.message.created = []\n    this.message.created.push(create)\n    // this.wakeup() not needed, since this is part of data packing.\n  }\n\n  /**\n   * Enqueues a proxy call message.\n   */\n  emitCall(remoteId: number, name: string, args: mixed): Promise<mixed> {\n    const callId = this.nextCallId++\n    const message: CallMessage = {\n      callId,\n      remoteId,\n      name,\n      ...packData(this, args)\n    }\n    if (this.message.calls == null) this.message.calls = []\n    this.message.calls.push(message)\n    this.wakeup()\n\n    return new Promise((resolve, reject) => {\n      this.pendingCalls[callId] = { name, resolve, reject }\n    })\n  }\n\n  /**\n   * Enqueues an event message.\n   */\n  emitEvent(localId: number, name: string, payload: mixed): void {\n    const message: EventMessage = {\n      localId,\n      name,\n      ...packData(this, payload)\n    }\n    if (this.message.events == null) this.message.events = []\n    this.message.events.push(message)\n    this.wakeup()\n  }\n\n  /**\n   * Enqueues a function return message.\n   */\n  emitReturn(callId: number, fail: boolean, value: mixed): void {\n    const message: ReturnMessage = {\n      callId,\n      ...(fail ? packThrow(this, value) : packData(this, value))\n    }\n    if (this.message.returns == null) this.message.returns = []\n    this.message.returns.push(message)\n    this.wakeup()\n  }\n\n  /**\n   * Handles an incoming message,\n   * updating state and triggering side-effects as needed.\n   */\n  handleMessage(message: Message): void {\n    // ----------------------------------------\n    // Phase 1: Get our proxies up to date.\n    // ----------------------------------------\n\n    // Handle newly-created objects:\n    if (message.created) {\n      // Pass 1: Create proxies for the new objects:\n      for (const create of message.created) {\n        this.proxies[create.localId] = makeProxy(this, create)\n      }\n\n      // Pass 2: Fill in the values:\n      for (const create of message.created) {\n        updateObjectProps(this, this.proxies[create.localId], create.props)\n      }\n    }\n\n    // Handle updated objects:\n    if (message.changed) {\n      // Pass 1: Update all the proxies:\n      for (const change of message.changed) {\n        const { localId, props } = change\n        const o = this.proxies[localId]\n        if (o == null) {\n          throw new RangeError(`Invalid localId ${localId}`)\n        }\n        updateObjectProps(this, o, props)\n      }\n\n      // Pass 2: Fire the callbacks:\n      for (const change of message.changed) {\n        update(this.proxies[change.localId])\n      }\n    }\n\n    // ----------------------------------------\n    // Phase 2: Handle events & method calls\n    // ----------------------------------------\n\n    // Handle events:\n    if (message.events) {\n      for (const event of message.events) {\n        const { localId, name } = event\n        const o = localId === 0 ? this : this.proxies[localId]\n        if (o == null) continue\n        try {\n          emit(o, name, unpackData(this, event, name))\n        } catch (e) {\n          emit(o, 'error', e) // Payload unpacking problem\n        }\n      }\n    }\n\n    // Handle method calls:\n    if (message.calls) {\n      for (const call of message.calls) {\n        const { callId, remoteId, name } = call\n\n        try {\n          const o = this.objects[remoteId]\n          if (o == null) {\n            throw new TypeError(\n              `Cannot call method '${name}' of closed proxy (remote)`\n            )\n          }\n          if (typeof o[name] !== 'function') {\n            throw new TypeError(`'${name}' is not a function`)\n          }\n          const args = unpackData(this, call, `${name}.arguments`)\n          Promise.resolve(o[name].apply(o, args)).then(\n            value => this.emitReturn(callId, false, value),\n            e => this.emitReturn(callId, true, e)\n          )\n        } catch (e) {\n          this.emitReturn(callId, true, e)\n        }\n      }\n    }\n\n    // Handle method returns:\n    if (message.returns) {\n      for (const ret of message.returns) {\n        const { callId } = ret\n        const pendingCall = this.pendingCalls[callId]\n        if (pendingCall == null) {\n          throw new RangeError(`Invalid callId ${callId}`)\n        }\n        try {\n          pendingCall.resolve(\n            unpackData(this, ret, `${pendingCall.name}.return`)\n          )\n        } catch (e) {\n          pendingCall.reject(e)\n        } finally {\n          delete this.pendingCalls[callId]\n        }\n      }\n    }\n\n    // ----------------------------------------\n    // Phase 3: Clean up closed objects\n    // ----------------------------------------\n\n    if (message.closed) {\n      for (const localId of message.closed) {\n        const o = this.proxies[localId]\n        if (o == null) return\n        delete this.proxies[localId]\n        close(o)\n      }\n    }\n  }\n\n  /**\n   * Sends the current message.\n   */\n  sendNow(): void {\n    if (this.closed) return\n\n    // Build change messages:\n    for (const id in this.dirty) {\n      const localId = Number(id)\n      const { object, cache } = this.dirty[localId]\n      const { dirty, props } = diffObject(this, object, cache)\n      if (dirty) {\n        const message: ChangeMessage = { localId, props }\n        if (this.message.changed == null) this.message.changed = []\n        this.message.changed.push(message)\n      }\n    }\n\n    const message = this.message\n    this.dirty = {}\n    this.message = {}\n    this.sendMessage(message)\n  }\n\n  /**\n   * Something has changed, so prepare to send the pending message:\n   */\n  wakeup(): void {\n    if (this.sendPending) return\n\n    this.sendPending = true\n    const task = () => {\n      this.sendPending = false\n      this.lastUpdate = Date.now()\n      this.sendNow()\n    }\n\n    // We really do want `setTimeout` here, even if the delay is 0,\n    // since promises and other micro tasks should fire first.\n    const delay = this.lastUpdate + this.throttleMs - Date.now()\n    setTimeout(task, delay < 0 ? 0 : delay)\n  }\n}\n\nbridgifyClass(BridgeState)\n","// @flow\n\nimport { packData, unpackData } from './data.js'\nimport { addListener } from './manage.js'\nimport { type Message } from './protocol.js'\nimport { BridgeState } from './state.js'\n\n/**\n * The bridge sends messages using this function.\n */\nexport type SendMessage = (message: Object) => mixed\n\n/**\n * Options used to create a new bridge.\n */\nexport type BridgeOptions = {\n  sendMessage: SendMessage,\n  throttleMs?: number\n}\n\n/**\n * Options used to create a new local bridge.\n */\nexport type LocalBridgeOptions = {\n  cloneMessage?: (x: Object) => Object,\n  throttleMs?: number\n}\n\n/**\n * An object bridge.\n */\nexport class Bridge {\n  +_state: BridgeState\n  +_rootPromise: Promise<Object>\n\n  constructor(opts: BridgeOptions) {\n    this._state = new BridgeState(opts)\n    this._rootPromise = new Promise(resolve =>\n      addListener(this._state, 'root', resolve)\n    )\n  }\n\n  handleMessage(message: Message): mixed {\n    this._state.handleMessage(message)\n  }\n\n  getRoot() {\n    return this._rootPromise\n  }\n\n  sendRoot(root: Object) {\n    this._state.emitEvent(0, 'root', root)\n  }\n\n  close(error: Error) {\n    this._state.close(error)\n  }\n}\n\n/**\n * Bridges a single object locally. 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package.json

 {
   "name": "yaob",
-  "version": "0.3.5",
+  "version": "0.3.6",
   "description": "Bridges an object-oriented API across a messaging layer",
@@ -26,3 +26,3 @@ "repository": {
     "flow": "flow",
-    "lint": "eslint --ignore-path .gitignore .",
+    "lint": "eslint --ext .js,.ts .",
     "precommit": "lint-staged && flow && npm test && npm run build",
@@ -39,3 +39,3 @@ "prepare": "npm run build",
   "lint-staged": {
-    "*.js": "eslint"
+    "*.{js,ts}": "eslint"
   },
@@ -52,2 +52,3 @@ "dependencies": {
     "@typescript-eslint/parser": "^2.0.0",
+    "assert-log": "^0.2.1",
     "babel-eslint": ">=10.0.0",
@@ -54,0 +55,0 @@ "chai": "^4.1.2",

src/data.js

@@ -37,2 +37,3 @@ // @flow
   | 'u' // Undefined
+  | 'ab' // ArrayBuffer
   | 'u8' // Uint8Array
@@ -122,2 +123,3 @@
       if (data instanceof Error) return 'e'
+      if (data instanceof ArrayBuffer) return 'ab'
       if (data instanceof Uint8Array) return 'u8'
@@ -214,2 +216,5 @@ if (data[MAGIC_KEY] != null) {
 
+    case 'ab':
+      return base64.stringify(new Uint8Array(data))
+
     case 'u8':
@@ -317,2 +322,8 @@ return base64.stringify(data)
 
+    case 'ab':
+      if (typeof raw !== 'string') {
+        throw new TypeError(`Expecting a base64 string at ${path}`)
+      }
+      return base64.parse(raw).buffer
+
     case 'u8':
@@ -319,0 +330,0 @@ if (typeof raw !== 'string') {

src/index.d.ts

@@ -52,3 +52,3 @@ /**
  */
-export declare const onMethod: Function
+export declare function onMethod(name: string, f: Function): CallbackRemover
 
@@ -59,3 +59,3 @@ /**
  */
-export declare const watchMethod: Function
+export declare function watchMethod(name: string, f: Function): CallbackRemover
 
@@ -76,6 +76,3 @@ /**
 export declare function bridgifyObject<Type extends object>(o: Type): Type
-export declare function shareData(
-  table: { [name: string]: object },
-  namespace?: string
-): void
+export declare function shareData(table: object, namespace?: string): void
 
@@ -82,0 +79,0 @@ export declare function close(o: object): unknown

src/events/events.js

-// @flow
-
-// No user-supplied value will ever be identical to this.
-export const dirtyValue = {}
-
-// idea: `on`, `watch`, `emit`, `update` &c. all add the object to a table.
-// The table contains subscribers and a value snapshot.
-// Emit grabs subscribers from the table and calls them (if any).
-// `on` and `watch` add the item to the table and then hook up the subscriber.
-
-// `close` removes the object from the table. It can be re-added trivially
-// So closing isn't really death, in this case.
-// The bridge might have a different eviction strategy for this
-// Actually, the bridge would have two tables, object -> id and id > object.
-// closing would remove the second table, but the first could be a `WeakMap`
-// that stays around forever. So, really, we don't need `close`
-// at this level of the game - the fact that we use a `WeakMap` is
-// enough to avoid all memory problems.
-
-// Update adds to the table, then runs a diff.
-// This happens synchronously, including the callbacks.
-// If the callbacks throw, that flows back through the `update` call.
-// This would include the JSON-ification in the case of the bridge.
-
-// There are four cases where a user can put an object into YAOB:
-// - top-level `sendMessage` calls
-// - method calls / return values
-// - event payloads
-// - property updates
-
-// In each of these cases, the user is calling some method to make this happen,
-// so this is where the errors should kick out from. Basically, yaob will be free
-// of try/catch statements, letting errors happen where they happen (but method
-// calls are `async`, so they reject).
-
-// Object packing is historically the most difficult - we need to
-// recurse down the new object to check for errors, but we don't
-// want to assign ID's in case there is an error & we need to back out.
-// On the flip side, we don't want to recurse twice if we don't have to,
-// so we *should* assign ID's, knowing they may be disposed of.
-// This is probably fine if packing messages is an atomic, synchronous operation.
-// Our `catch/finally` block can clean up newly-allocated ID's if anything fails,
-// since we aren't going forward with this send. One solution is to return new
-// id's in an array, and then only commit that array on success. Packing will
-// either succeed, returning a new list, or it will fail, throwing an exception
-// with no other side effects
-
-// The three major subsystems are events (this one), JSON-based structured clone,
-// and the YAOB state machine. The YAOB state machine hooks the structured clone
-// algorithm in some way to add arbitrary object packing, which is the heart of
-// its business. The rest of the structured clone can stay the same. The YAOB
-// state machine also hooks the event system to listen to object lifetimes.
-// The only other thing it handles are method calls on its proxies (proxies are
-// part of the structured clone hooking).

src/events/types.js

-// @flow
-
-/**
- * Undoes the effect of `on` or `watch`.
- */
-export type CallbackRemover = () => mixed
-
-/**
- * Signature of the `on` and `watch` methods.
- */
-export type Subscriber<Events: {} = {}> = <Name: $Keys<Events>>(
-  name: Name,
-  f: (v: $ElementType<Events, Name>) => mixed
-) => CallbackRemover

No alert changes

Worsened metrics

Total package byte prevSize

242340

-0.38%

Dev dependency count

29

3.57%

Number of package files

20

-9.09%

Lines of code

3400

-1.05%

No dependency changes