@loaders.gl/core - npm Package Compare versions

Comparing version 1.3.3 to 2.0.0-alpha.1

dist/dist.min.js

@@ -1,1 +0,1 @@
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e)yield"string"==typeof r?r:n.decode(r,{stream:!0})}async function*Pe(e){let r="";for await(const n of e){let e;for(r+=n;(e=r.indexOf("\n"))>=0;){const n=r.slice(0,e+1);r=r.slice(e+1),yield n}}r.length>0&&(yield r)}async function*De(e){let r=1;for await(const n of e)yield{counter:r,line:n},r++}async function Le(e,r,n=(()=>{}),t=(()=>{})){if(!(e=await e).ok)return e;if(!e.body)return e;const o=e.headers.get("content-length"),s=o&&parseInt(o,10);if(!(o>0))return e;if("undefined"==typeof ReadableStream)return e;const i=new ReadableStream({start(o){!async function e(r,n,t,o,s,i,u){try{const{done:c,value:a}=await n.read();if(c)return i(),void r.close();t+=a.byteLength;const f=Math.round(t/o*100);s(f,{loadedBytes:t,totalBytes:o}),r.enqueue(a),await e(r,n,t,o,s,i,u)}catch(e){r.error(e),u(e)}}(o,e.body.getReader(),0,s,r,n,t)}});return new Response(i)}n.d(r,"TextEncoder",(function(){return Me})),n.d(r,"TextDecoder",(function(){return Ce})),n.d(r,"createReadStream",(function(){return Re})),n.d(r,"parseFile",(function(){return We})),n.d(r,"parseFileSync",(function(){return $e})),n.d(r,"loadFile",(function(){return Qe})),n.d(r,"path",(function(){return t})),n.d(r,"setPathPrefix",(function(){return se})),n.d(r,"getPathPrefix",(function(){return ie})),n.d(r,"resolvePath",(function(){return ue})),n.d(r,"fetchFile",(function(){return ce})),n.d(r,"readFileSync",(function(){return pe})),n.d(r,"writeFile",(function(){return be})),n.d(r,"writeFileSync",(function(){return ge})),n.d(r,"_getErrorMessageFromResponseSync",(function(){return me})),n.d(r,"_getErrorMessageFromResponse",(function(){return xe})),n.d(r,"registerLoaders",(function(){return H})),n.d(r,"parse",(function(){return re})),n.d(r,"parseSync",(function(){return ne})),n.d(r,"parseInBatches",(function(){return Ae})),n.d(r,"parseInBatchesSync",(function(){return Se})),n.d(r,"load",(function(){return ae})),n.d(r,"loadInBatches",(function(){return ve})),n.d(r,"encode",(function(){return Be})),n.d(r,"encodeSync",(function(){return Te})),n.d(r,"encodeInBatches",(function(){return ke})),n.d(r,"save",(function(){return je})),n.d(r,"saveSync",(function(){return _e})),n.d(r,"isPromise",(function(){return h})),n.d(r,"isIterable",(function(){return p})),n.d(r,"isAsyncIterable",(function(){return w})),n.d(r,"isIterator",(function(){return b})),n.d(r,"isFetchResponse",(function(){return g})),n.d(r,"isReadableStream",(function(){return x})),n.d(r,"isWritableStream",(function(){return A})),n.d(r,"toArrayBuffer",(function(){return L})),n.d(r,"getStreamIterator",(function(){return v})),n.d(r,"forEach",(function(){return Ie})),n.d(r,"concatenateAsyncIterator",(function(){return Ee})),n.d(r,"lineAsyncIterator",(function(){return Pe})),n.d(r,"textDecoderAsyncIterator",(function(){return Oe})),n.d(r,"numberedLineAsyncIterator",(function(){return De})),n.d(r,"isBrowser",(function(){return S.c})),n.d(r,"self",(function(){return S.e})),n.d(r,"window",(function(){return S.f})),n.d(r,"global",(function(){return S.b})),n.d(r,"document",(function(){return S.a})),n.d(r,"assert",(function(){return o})),n.d(r,"_selectLoader",(function(){return X})),n.d(r,"_WorkerThread",(function(){return $})),n.d(r,"_WorkerFarm",(function(){return N})),n.d(r,"_WorkerPool",(function(){return Q})),n.d(r,"_fetchProgress",(function(){return Le})),n.d(r,"_unregisterLoaders",(function(){return G}));const Me=S.b.TextEncoder,Ce=S.b.TextDecoder;async function Re(e,r){return console.warn("createReadStream() deprecated, use fetch().then(resp => resp.body)"),e=ue(e),(await ce(e,r)).body}function We(...e){return console.warn("parse() deprecated, use parse()"),re(...e)}function $e(...e){return console.warn("parseSync() deprecated, use parseSync()"),ne(...e)}function Qe(...e){return console.warn("loadFile() deprecated, use load()"),ae(...e)}}])}));

dist/es5/index.js

@@ -38,8 +38,2 @@ "use strict";
 });
-Object.defineProperty(exports, "loadInBatches", {
-  enumerable: true,
-  get: function get() {
-    return _load.loadInBatches;
-  }
-});
 Object.defineProperty(exports, "isBrowser", {
@@ -147,2 +141,8 @@ enumerable: true,
 });
+Object.defineProperty(exports, "loadInBatches", {
+  enumerable: true,
+  get: function get() {
+    return _loadInBatches.loadInBatches;
+  }
+});
 Object.defineProperty(exports, "encode", {
@@ -334,2 +334,4 @@ enumerable: true,
 
+var _loadInBatches = require("./lib/load-in-batches");
+
 var _encode = require("./lib/encode");
@@ -336,0 +338,0 @@

dist/es5/lib/fetch/fetch-file.browser.js

@@ -28,7 +28,2 @@ "use strict";
   (0, _createClass2["default"])(FileReadableResponse, [{
-    key: "url",
-    value: function url() {
-      return this._fileOrBlob.name || '';
-    }
-  }, {
     key: "arrayBuffer",
@@ -167,2 +162,7 @@ value: function () {
     }
+  }, {
+    key: "url",
+    get: function get() {
+      return this._fileOrBlob.name || '';
+    }
   }]);
@@ -169,0 +169,0 @@ return FileReadableResponse;

dist/es5/lib/load.js

@@ -8,3 +8,2 @@ "use strict";
 });
-exports.loadInBatches = loadInBatches;
 exports.load = load;
@@ -22,17 +21,11 @@
 
-var _normalizeOptions = require("./loader-utils/normalize-options");
-
-var _selectLoader = require("./select-loader");
-
 var _parse = require("./parse");
 
-var _parseInBatches = require("./parse-in-batches");
-
-function loadInBatches(_x, _x2, _x3) {
-  return _loadInBatches.apply(this, arguments);
+function load(_x, _x2, _x3) {
+  return _load.apply(this, arguments);
 }
 
-function _loadInBatches() {
-  _loadInBatches = (0, _asyncToGenerator2["default"])(_regenerator["default"].mark(function _callee(url, loaders, options) {
-    var response;
+function _load() {
+  _load = (0, _asyncToGenerator2["default"])(_regenerator["default"].mark(function _callee(url, loaders, options) {
+    var data;
     return _regenerator["default"].wrap(function _callee$(_context) {
@@ -42,30 +35,2 @@ while (1) {
           case 0:
-            _context.next = 2;
-            return (0, _fetchFile.fetchFile)(url, options);
-
-          case 2:
-            response = _context.sent;
-            return _context.abrupt("return", (0, _parseInBatches.parseInBatches)(response, loaders, options, url));
-
-          case 4:
-          case "end":
-            return _context.stop();
-        }
-      }
-    }, _callee);
-  }));
-  return _loadInBatches.apply(this, arguments);
-}
-
-function load(_x4, _x5, _x6) {
-  return _load.apply(this, arguments);
-}
-
-function _load() {
-  _load = (0, _asyncToGenerator2["default"])(_regenerator["default"].mark(function _callee2(url, loaders, options) {
-    var autoUrl, loader, loaderOptions, data;
-    return _regenerator["default"].wrap(function _callee2$(_context2) {
-      while (1) {
-        switch (_context2.prev = _context2.next) {
-          case 0:
             if (!Array.isArray(loaders) && !(0, _normalizeLoader.isLoaderObject)(loaders)) {
@@ -76,47 +41,41 @@ options = loaders;
 
-            autoUrl = (0, _isType.isFileReadable)(url) ? url.name : url;
-            loader = (0, _selectLoader.selectLoader)(loaders, autoUrl, null, {
-              nothrow: true
-            });
+            data = url;
 
-            if (!loader) {
-              _context2.next = 9;
+            if (!(typeof url === 'string')) {
+              _context.next = 6;
               break;
             }
 
-            if (!loader.loadAndParse) {
-              _context2.next = 9;
+            _context.next = 5;
+            return (0, _fetchFile.fetchFile)(url, options);
+
+          case 5:
+            data = _context.sent;
+
+          case 6:
+            if (!(0, _isType.isFileReadable)(url)) {
+              _context.next = 11;
               break;
             }
 
-            loaderOptions = (0, _normalizeOptions.mergeLoaderAndUserOptions)(options, loader);
-            _context2.next = 8;
-            return loader.loadAndParse(url, loaderOptions);
+            _context.next = 9;
+            return (0, _fetchFile.fetchFile)(url, options);
 
-          case 8:
-            return _context2.abrupt("return", _context2.sent);
-
           case 9:
-            data = url;
+            data = _context.sent;
+            url = null;
 
-            if (!((0, _isType.isFileReadable)(data) || typeof data === 'string')) {
-              _context2.next = 14;
-              break;
-            }
+          case 11:
+            _context.next = 13;
+            return (0, _parse.parse)(data, loaders, options, url);
 
-            _context2.next = 13;
-            return (0, _fetchFile.fetchFile)(url, options);
-
           case 13:
-            data = _context2.sent;
+            return _context.abrupt("return", _context.sent);
 
           case 14:
-            return _context2.abrupt("return", (0, _parse.parse)(data, loaders, options, url));
-
-          case 15:
           case "end":
-            return _context2.stop();
+            return _context.stop();
         }
       }
-    }, _callee2);
+    }, _callee);
   }));
@@ -123,0 +82,0 @@ return _load.apply(this, arguments);

dist/es5/lib/loader-utils/get-loader-context.js

@@ -9,3 +9,6 @@ "use strict";
 exports.getLoaderContext = getLoaderContext;
+exports.getLoaders = getLoaders;
 
+var _toConsumableArray2 = _interopRequireDefault(require("@babel/runtime/helpers/toConsumableArray"));
+
 var _defineProperty2 = _interopRequireDefault(require("@babel/runtime/helpers/defineProperty"));
@@ -17,7 +20,36 @@
 
-function getLoaderContext(context, options) {
-  return _objectSpread({
-    fetch: typeof window !== 'undefined' && window.fetch
+function getLoaderContext(context, options, previousContext) {
+  if (previousContext) {
+    return previousContext;
+  }
+
+  context = _objectSpread({
+    fetch: context.fetch || typeof window !== 'undefined' && window.fetch
   }, context);
+
+  if (!Array.isArray(context.loaders)) {
+    context.loaders = null;
+  }
+
+  return context;
 }
+
+function getLoaders(loaders, context) {
+  if (!context && !Array.isArray(loaders)) {
+    return loaders;
+  }
+
+  var candidateLoaders;
+
+  if (loaders) {
+    candidateLoaders = Array.isArray(loaders) ? loaders : [loaders];
+  }
+
+  if (context && context.loaders) {
+    var contextLoaders = Array.isArray(context.loaders) ? context.loaders : [context.loaders];
+    candidateLoaders = candidateLoaders ? [].concat((0, _toConsumableArray2["default"])(candidateLoaders), (0, _toConsumableArray2["default"])(contextLoaders)) : contextLoaders;
+  }
+
+  return candidateLoaders && candidateLoaders.length ? candidateLoaders : null;
+}
 //# sourceMappingURL=get-loader-context.js.map

dist/es5/lib/loader-utils/normalize-loader.js

@@ -28,3 +28,3 @@ "use strict";
 
-  var hasParser = loader.parseTextSync || loader.parseSync || loader.parse || loader.loadAndParse || loader.parseStream || loader.parseInBatches || loader.worker;
+  var hasParser = loader.parseTextSync || loader.parseSync || loader.parse || loader.parseStream || loader.parseInBatches || loader.worker;
   return hasParser;
@@ -34,3 +34,3 @@ }
 function normalizeLoader(loader) {
-  (0, _assert["default"])(isLoaderObject(loader));
+  (0, _assert["default"])(isLoaderObject(loader), 'invalid loader');
   var options;
@@ -37,0 +37,0 @@

dist/es5/lib/parse-in-batches-sync.js

@@ -16,3 +16,3 @@ "use strict";
 
-var _normalizeOptions = require("./loader-utils/normalize-options");
+var _mergeOptions = require("./loader-utils/merge-options");
 
@@ -43,5 +43,6 @@ var _getData = require("./loader-utils/get-data");
             loader = (0, _selectLoader.selectLoader)(loaders, url, null);
-            options = (0, _normalizeOptions.mergeLoaderAndUserOptions)(options, loader);
+            options = (0, _mergeOptions.mergeOptions)(loader, options);
             context = (0, _getLoaderContext.getLoaderContext)({
-              url: url
+              url: url,
+              loaders: loaders
             }, options);
@@ -48,0 +49,0 @@ return _context.abrupt("return", parseWithLoaderInBatchesSync(loader, data, options, context));

dist/es5/lib/parse-in-batches.js

@@ -16,3 +16,3 @@ "use strict";
 
-var _normalizeOptions = require("./loader-utils/normalize-options");
+var _mergeOptions = require("./loader-utils/merge-options");
 
@@ -43,5 +43,6 @@ var _getData = require("./loader-utils/get-data");
             loader = (0, _selectLoader.selectLoader)(loaders, url, null);
-            options = (0, _normalizeOptions.mergeLoaderAndUserOptions)(options, loader);
+            options = (0, _mergeOptions.mergeOptions)(loader, options);
             context = (0, _getLoaderContext.getLoaderContext)({
-              url: url
+              url: url,
+              loaders: loaders
             }, options);
@@ -48,0 +49,0 @@ return _context.abrupt("return", parseWithLoaderInBatches(loader, data, options, context));

dist/es5/lib/parse-sync.js

@@ -12,3 +12,3 @@ "use strict";
 
-var _normalizeOptions = require("./loader-utils/normalize-options");
+var _mergeOptions = require("./loader-utils/merge-options");
 
@@ -19,5 +19,5 @@ var _getData = require("./loader-utils/get-data");
 
-function parseSync(data, loaders, options, url) {
+function parseSync(data, loaders, options, context) {
   if (!Array.isArray(loaders) && !(0, _normalizeLoader.isLoaderObject)(loaders)) {
-    url = options;
+    context = options;
     options = loaders;
@@ -27,4 +27,13 @@ loaders = null;
 
-  var loader = (0, _selectLoader.selectLoader)(loaders, url, data);
+  var url = '';
 
+  if (typeof context === 'string') {
+    url = context;
+    context = null;
+  }
+
+  options = options || {};
+  var candidateLoaders = (0, _getLoaderContext.getLoaders)(loaders, context);
+  var loader = (0, _selectLoader.selectLoader)(candidateLoaders, url, data);
+
   if (!loader) {
@@ -34,6 +43,7 @@ return null;
 
-  options = (0, _normalizeOptions.mergeLoaderAndUserOptions)(options, loader);
-  var context = (0, _getLoaderContext.getLoaderContext)({
+  options = (0, _mergeOptions.mergeOptions)(loader, options);
+  context = (0, _getLoaderContext.getLoaderContext)({
     url: url,
-    parseSync: parseSync
+    parseSync: parseSync,
+    loaders: loaders
   }, options);
@@ -54,4 +64,4 @@ return parseWithLoaderSync(loader, data, options, context);
 
-  throw new Error("Could not parse ".concat(context.url || 'data', " using ").concat(loader.name, " loader"));
+  throw new Error("".concat(loader.name, ": Loader does not support 'parseSync' (").concat(context.url || 'data', ")"));
 }
 //# sourceMappingURL=parse-sync.js.map

dist/es5/lib/parse.js

@@ -18,3 +18,3 @@ "use strict";
 
-var _normalizeOptions = require("./loader-utils/normalize-options");
+var _mergeOptions = require("./loader-utils/merge-options");
 
@@ -34,4 +34,4 @@ var _getData = require("./loader-utils/get-data");
 function _parse() {
-  _parse = (0, _asyncToGenerator2["default"])(_regenerator["default"].mark(function _callee(data, loaders, options, url) {
-    var autoUrl, loader, context;
+  _parse = (0, _asyncToGenerator2["default"])(_regenerator["default"].mark(function _callee(data, loaders, options, context) {
+    var url, autoUrl, candidateLoaders, loader;
     return _regenerator["default"].wrap(function _callee$(_context) {
@@ -41,4 +41,4 @@ while (1) {
           case 0:
-            if (loaders && !Array.isArray(loaders) && !(0, _normalizeLoader.isLoaderObject)(loaders)) {
-              url = options;
+            if (!Array.isArray(loaders) && !(0, _normalizeLoader.isLoaderObject)(loaders)) {
+              context = options;
               options = loaders;
@@ -48,17 +48,35 @@ loaders = null;
 
+            url = '';
+
+            if (typeof context === 'string') {
+              url = context;
+              context = null;
+            }
+
             options = options || {};
             autoUrl = (0, _getData.getUrlFromData)(data, url);
-            loader = (0, _selectLoader.selectLoader)(loaders, autoUrl, data);
-            options = (0, _normalizeOptions.mergeLoaderAndUserOptions)(options, loader);
+            candidateLoaders = (0, _getLoaderContext.getLoaders)(loaders, context);
+            loader = (0, _selectLoader.selectLoader)(candidateLoaders, autoUrl, data);
+
+            if (loader) {
+              _context.next = 9;
+              break;
+            }
+
+            return _context.abrupt("return", null);
+
+          case 9:
+            options = (0, _mergeOptions.mergeOptions)(loader, options);
             context = (0, _getLoaderContext.getLoaderContext)({
               url: autoUrl,
-              parse: parse
-            }, options);
-            _context.next = 8;
+              parse: parse,
+              loaders: candidateLoaders
+            }, options, context);
+            _context.next = 13;
             return parseWithLoader(loader, data, options, context);
 
-          case 8:
+          case 13:
             return _context.abrupt("return", _context.sent);
 
-          case 9:
+          case 14:
           case "end":
@@ -65,0 +83,0 @@ return _context.stop();

dist/es5/lib/select-loader.js

@@ -12,2 +12,4 @@ "use strict";
 
+var _toConsumableArray2 = _interopRequireDefault(require("@babel/runtime/helpers/toConsumableArray"));
+
 var _registerLoaders = require("./register-loaders");
@@ -35,3 +37,3 @@
 
-  loaders = loaders || (0, _registerLoaders.getRegisteredLoaders)();
+  loaders = [].concat((0, _toConsumableArray2["default"])(loaders || []), (0, _toConsumableArray2["default"])((0, _registerLoaders.getRegisteredLoaders)()));
   normalizeLoaders(loaders);
@@ -48,3 +50,13 @@ url = url.replace(/\?.*/, '');
 
-    throw new Error("No valid loader found for ".concat(url));
+    var message = 'No valid loader found';
+
+    if (data) {
+      message += " for data starting with \"".concat(getFirstCharacters(data), "\"");
+    }
+
+    if (url) {
+      message += " for ".concat(url);
+    }
+
+    throw new Error(message);
   }
@@ -213,2 +225,17 @@
 
+function getFirstCharacters(data) {
+  var length = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 5;
+
+  if (typeof data === 'string') {
+    return data.slice(0, length);
+  } else if (ArrayBuffer.isView(data)) {
+    return getMagicString(data.buffer, data.byteOffset, length);
+  } else if (data instanceof ArrayBuffer) {
+    var byteOffset = 0;
+    return getMagicString(data, byteOffset, length);
+  }
+
+  return '';
+}
+
 function getMagicString(arrayBuffer, byteOffset, length) {
@@ -215,0 +242,0 @@ if (arrayBuffer.byteLength <= byteOffset + length) {

dist/es6/index.js

@@ -19,3 +19,4 @@ import { parse } from './lib/parse';
 export { parseInBatchesSync } from './lib/parse-in-batches-sync';
-export { load, loadInBatches } from './lib/load';
+export { load } from './lib/load';
+export { loadInBatches } from './lib/load-in-batches';
 export { encode, encodeSync, encodeInBatches } from './lib/encode';
@@ -22,0 +23,0 @@ export { save, saveSync } from './lib/save';

dist/es6/lib/fetch/fetch-file.browser.js

@@ -24,3 +24,3 @@ import assert from '../../utils/assert';
 
-  url() {
+  get url() {
     return this._fileOrBlob.name || '';
@@ -27,0 +27,0 @@ }

dist/es6/lib/load.js

 import { isFileReadable } from '../javascript-utils/is-type';
 import { fetchFile } from './fetch/fetch-file';
 import { isLoaderObject } from './loader-utils/normalize-loader';
-import { mergeLoaderAndUserOptions } from './loader-utils/normalize-options';
-import { selectLoader } from './select-loader';
 import { parse } from './parse';
-import { parseInBatches } from './parse-in-batches';
-export async function loadInBatches(url, loaders, options) {
-  const response = await fetchFile(url, options);
-  return parseInBatches(response, loaders, options, url);
-}
 export async function load(url, loaders, options) {
@@ -18,22 +11,15 @@ if (!Array.isArray(loaders) && !isLoaderObject(loaders)) {
 
-  const autoUrl = isFileReadable(url) ? url.name : url;
-  const loader = selectLoader(loaders, autoUrl, null, {
-    nothrow: true
-  });
+  let data = url;
 
-  if (loader) {
-    if (loader.loadAndParse) {
-      const loaderOptions = mergeLoaderAndUserOptions(options, loader);
-      return await loader.loadAndParse(url, loaderOptions);
-    }
+  if (typeof url === 'string') {
+    data = await fetchFile(url, options);
   }
 
-  let data = url;
-
-  if (isFileReadable(data) || typeof data === 'string') {
+  if (isFileReadable(url)) {
     data = await fetchFile(url, options);
+    url = null;
   }
 
-  return parse(data, loaders, options, url);
+  return await parse(data, loaders, options, url);
 }
 //# sourceMappingURL=load.js.map

dist/es6/lib/loader-utils/get-loader-context.js

@@ -7,7 +7,35 @@ import _defineProperty from "@babel/runtime/helpers/esm/defineProperty";
 
-export function getLoaderContext(context, options) {
-  return _objectSpread({
-    fetch: typeof window !== 'undefined' && window.fetch
+export function getLoaderContext(context, options, previousContext) {
+  if (previousContext) {
+    return previousContext;
+  }
+
+  context = _objectSpread({
+    fetch: context.fetch || typeof window !== 'undefined' && window.fetch
   }, context);
+
+  if (!Array.isArray(context.loaders)) {
+    context.loaders = null;
+  }
+
+  return context;
 }
+export function getLoaders(loaders, context) {
+  if (!context && !Array.isArray(loaders)) {
+    return loaders;
+  }
+
+  let candidateLoaders;
+
+  if (loaders) {
+    candidateLoaders = Array.isArray(loaders) ? loaders : [loaders];
+  }
+
+  if (context && context.loaders) {
+    const contextLoaders = Array.isArray(context.loaders) ? context.loaders : [context.loaders];
+    candidateLoaders = candidateLoaders ? [...candidateLoaders, ...contextLoaders] : contextLoaders;
+  }
+
+  return candidateLoaders && candidateLoaders.length ? candidateLoaders : null;
+}
 //# sourceMappingURL=get-loader-context.js.map

dist/es6/lib/loader-utils/normalize-loader.js

@@ -17,7 +17,7 @@ import _defineProperty from "@babel/runtime/helpers/esm/defineProperty";
 
-  const hasParser = loader.parseTextSync || loader.parseSync || loader.parse || loader.loadAndParse || loader.parseStream || loader.parseInBatches || loader.worker;
+  const hasParser = loader.parseTextSync || loader.parseSync || loader.parse || loader.parseStream || loader.parseInBatches || loader.worker;
   return hasParser;
 }
 export function normalizeLoader(loader) {
-  assert(isLoaderObject(loader));
+  assert(isLoaderObject(loader), 'invalid loader');
   let options;
@@ -24,0 +24,0 @@

dist/es6/lib/parse-in-batches-sync.js

 import { isLoaderObject } from './loader-utils/normalize-loader';
-import { mergeLoaderAndUserOptions } from './loader-utils/normalize-options';
+import { mergeOptions } from './loader-utils/merge-options';
 import { getIteratorFromData } from './loader-utils/get-data';
@@ -14,5 +14,6 @@ import { getLoaderContext } from './loader-utils/get-loader-context';
   const loader = selectLoader(loaders, url, null);
-  options = mergeLoaderAndUserOptions(options, loader);
+  options = mergeOptions(loader, options);
   const context = getLoaderContext({
-    url
+    url,
+    loaders
   }, options);
@@ -19,0 +20,0 @@ return parseWithLoaderInBatchesSync(loader, data, options, context);

dist/es6/lib/parse-in-batches.js

 import { isLoaderObject } from './loader-utils/normalize-loader';
-import { mergeLoaderAndUserOptions } from './loader-utils/normalize-options';
+import { mergeOptions } from './loader-utils/merge-options';
 import { getAsyncIteratorFromData } from './loader-utils/get-data';
@@ -14,5 +14,6 @@ import { getLoaderContext } from './loader-utils/get-loader-context';
   const loader = selectLoader(loaders, url, null);
-  options = mergeLoaderAndUserOptions(options, loader);
+  options = mergeOptions(loader, options);
   const context = getLoaderContext({
-    url
+    url,
+    loaders
   }, options);
@@ -19,0 +20,0 @@ return parseWithLoaderInBatches(loader, data, options, context);

dist/es6/lib/parse-sync.js

 import { selectLoader } from './select-loader';
 import { isLoaderObject } from './loader-utils/normalize-loader';
-import { mergeLoaderAndUserOptions } from './loader-utils/normalize-options';
+import { mergeOptions } from './loader-utils/merge-options';
 import { getArrayBufferOrStringFromDataSync } from './loader-utils/get-data';
-import { getLoaderContext } from './loader-utils/get-loader-context';
-export function parseSync(data, loaders, options, url) {
+import { getLoaders, getLoaderContext } from './loader-utils/get-loader-context';
+export function parseSync(data, loaders, options, context) {
   if (!Array.isArray(loaders) && !isLoaderObject(loaders)) {
-    url = options;
+    context = options;
     options = loaders;
@@ -13,4 +13,13 @@ loaders = null;
 
-  const loader = selectLoader(loaders, url, data);
+  let url = '';
 
+  if (typeof context === 'string') {
+    url = context;
+    context = null;
+  }
+
+  options = options || {};
+  const candidateLoaders = getLoaders(loaders, context);
+  const loader = selectLoader(candidateLoaders, url, data);
+
   if (!loader) {
@@ -20,6 +29,7 @@ return null;
 
-  options = mergeLoaderAndUserOptions(options, loader);
-  const context = getLoaderContext({
+  options = mergeOptions(loader, options);
+  context = getLoaderContext({
     url,
-    parseSync
+    parseSync,
+    loaders
   }, options);
@@ -40,4 +50,4 @@ return parseWithLoaderSync(loader, data, options, context);
 
-  throw new Error("Could not parse ".concat(context.url || 'data', " using ").concat(loader.name, " loader"));
+  throw new Error("".concat(loader.name, ": Loader does not support 'parseSync' (").concat(context.url || 'data', ")"));
 }
 //# sourceMappingURL=parse-sync.js.map

dist/es6/lib/parse.js

 import assert from '../utils/assert';
 import { isLoaderObject } from './loader-utils/normalize-loader';
-import { mergeLoaderAndUserOptions } from './loader-utils/normalize-options';
+import { mergeOptions } from './loader-utils/merge-options';
 import { getUrlFromData } from './loader-utils/get-data';
 import { getArrayBufferOrStringFromData } from './loader-utils/get-data';
-import { getLoaderContext } from './loader-utils/get-loader-context';
+import { getLoaders, getLoaderContext } from './loader-utils/get-loader-context';
 import parseWithWorker from './loader-utils/parse-with-worker';
 import { selectLoader } from './select-loader';
-export async function parse(data, loaders, options, url) {
-  if (loaders && !Array.isArray(loaders) && !isLoaderObject(loaders)) {
-    url = options;
+export async function parse(data, loaders, options, context) {
+  if (!Array.isArray(loaders) && !isLoaderObject(loaders)) {
+    context = options;
     options = loaders;
@@ -16,10 +16,24 @@ loaders = null;
 
+  let url = '';
+
+  if (typeof context === 'string') {
+    url = context;
+    context = null;
+  }
+
   options = options || {};
   const autoUrl = getUrlFromData(data, url);
-  const loader = selectLoader(loaders, autoUrl, data);
-  options = mergeLoaderAndUserOptions(options, loader);
-  const context = getLoaderContext({
+  const candidateLoaders = getLoaders(loaders, context);
+  const loader = selectLoader(candidateLoaders, autoUrl, data);
+
+  if (!loader) {
+    return null;
+  }
+
+  options = mergeOptions(loader, options);
+  context = getLoaderContext({
     url: autoUrl,
-    parse
-  }, options);
+    parse,
+    loaders: candidateLoaders
+  }, options, context);
   return await parseWithLoader(loader, data, options, context);
@@ -26,0 +40,0 @@ }

dist/es6/lib/select-loader.js

@@ -15,3 +15,3 @@ import { getRegisteredLoaders } from './register-loaders';
 
-  loaders = loaders || getRegisteredLoaders();
+  loaders = [...(loaders || []), ...getRegisteredLoaders()];
   normalizeLoaders(loaders);
@@ -28,3 +28,13 @@ url = url.replace(/\?.*/, '');
 
-    throw new Error("No valid loader found for ".concat(url));
+    let message = 'No valid loader found';
+
+    if (data) {
+      message += " for data starting with \"".concat(getFirstCharacters(data), "\"");
+    }
+
+    if (url) {
+      message += " for ".concat(url);
+    }
+
+    throw new Error(message);
   }
@@ -112,2 +122,15 @@
 
+function getFirstCharacters(data, length = 5) {
+  if (typeof data === 'string') {
+    return data.slice(0, length);
+  } else if (ArrayBuffer.isView(data)) {
+    return getMagicString(data.buffer, data.byteOffset, length);
+  } else if (data instanceof ArrayBuffer) {
+    const byteOffset = 0;
+    return getMagicString(data, byteOffset, length);
+  }
+
+  return '';
+}
+
 function getMagicString(arrayBuffer, byteOffset, length) {
@@ -114,0 +137,0 @@ if (arrayBuffer.byteLength <= byteOffset + length) {

dist/esm/index.js

@@ -21,3 +21,4 @@ import _regeneratorRuntime from "@babel/runtime/regenerator";
 export { parseInBatchesSync } from './lib/parse-in-batches-sync';
-export { load, loadInBatches } from './lib/load';
+export { load } from './lib/load';
+export { loadInBatches } from './lib/load-in-batches';
 export { encode, encodeSync, encodeInBatches } from './lib/encode';
@@ -24,0 +25,0 @@ export { save, saveSync } from './lib/save';

dist/esm/lib/fetch/fetch-file.browser.js

@@ -16,7 +16,2 @@ import _regeneratorRuntime from "@babel/runtime/regenerator";
   _createClass(FileReadableResponse, [{
-    key: "url",
-    value: function url() {
-      return this._fileOrBlob.name || '';
-    }
-  }, {
     key: "arrayBuffer",
@@ -155,2 +150,7 @@ value: function () {
     }
+  }, {
+    key: "url",
+    get: function get() {
+      return this._fileOrBlob.name || '';
+    }
   }]);
@@ -157,0 +157,0 @@

dist/esm/lib/load.js

@@ -6,13 +6,10 @@ import _regeneratorRuntime from "@babel/runtime/regenerator";
 import { isLoaderObject } from './loader-utils/normalize-loader';
-import { mergeLoaderAndUserOptions } from './loader-utils/normalize-options';
-import { selectLoader } from './select-loader';
 import { parse } from './parse';
-import { parseInBatches } from './parse-in-batches';
-export function loadInBatches(_x, _x2, _x3) {
-  return _loadInBatches.apply(this, arguments);
+export function load(_x, _x2, _x3) {
+  return _load.apply(this, arguments);
 }
 
-function _loadInBatches() {
-  _loadInBatches = _asyncToGenerator(_regeneratorRuntime.mark(function _callee(url, loaders, options) {
-    var response;
+function _load() {
+  _load = _asyncToGenerator(_regeneratorRuntime.mark(function _callee(url, loaders, options) {
+    var data;
     return _regeneratorRuntime.wrap(function _callee$(_context) {
@@ -22,30 +19,2 @@ while (1) {
           case 0:
-            _context.next = 2;
-            return fetchFile(url, options);
-
-          case 2:
-            response = _context.sent;
-            return _context.abrupt("return", parseInBatches(response, loaders, options, url));
-
-          case 4:
-          case "end":
-            return _context.stop();
-        }
-      }
-    }, _callee);
-  }));
-  return _loadInBatches.apply(this, arguments);
-}
-
-export function load(_x4, _x5, _x6) {
-  return _load.apply(this, arguments);
-}
-
-function _load() {
-  _load = _asyncToGenerator(_regeneratorRuntime.mark(function _callee2(url, loaders, options) {
-    var autoUrl, loader, loaderOptions, data;
-    return _regeneratorRuntime.wrap(function _callee2$(_context2) {
-      while (1) {
-        switch (_context2.prev = _context2.next) {
-          case 0:
             if (!Array.isArray(loaders) && !isLoaderObject(loaders)) {
@@ -56,47 +25,41 @@ options = loaders;
 
-            autoUrl = isFileReadable(url) ? url.name : url;
-            loader = selectLoader(loaders, autoUrl, null, {
-              nothrow: true
-            });
+            data = url;
 
-            if (!loader) {
-              _context2.next = 9;
+            if (!(typeof url === 'string')) {
+              _context.next = 6;
               break;
             }
 
-            if (!loader.loadAndParse) {
-              _context2.next = 9;
+            _context.next = 5;
+            return fetchFile(url, options);
+
+          case 5:
+            data = _context.sent;
+
+          case 6:
+            if (!isFileReadable(url)) {
+              _context.next = 11;
               break;
             }
 
-            loaderOptions = mergeLoaderAndUserOptions(options, loader);
-            _context2.next = 8;
-            return loader.loadAndParse(url, loaderOptions);
+            _context.next = 9;
+            return fetchFile(url, options);
 
-          case 8:
-            return _context2.abrupt("return", _context2.sent);
-
           case 9:
-            data = url;
+            data = _context.sent;
+            url = null;
 
-            if (!(isFileReadable(data) || typeof data === 'string')) {
-              _context2.next = 14;
-              break;
-            }
+          case 11:
+            _context.next = 13;
+            return parse(data, loaders, options, url);
 
-            _context2.next = 13;
-            return fetchFile(url, options);
-
           case 13:
-            data = _context2.sent;
+            return _context.abrupt("return", _context.sent);
 
           case 14:
-            return _context2.abrupt("return", parse(data, loaders, options, url));
-
-          case 15:
           case "end":
-            return _context2.stop();
+            return _context.stop();
         }
       }
-    }, _callee2);
+    }, _callee);
   }));
@@ -103,0 +66,0 @@ return _load.apply(this, arguments);

dist/esm/lib/loader-utils/get-loader-context.js

@@ -0,1 +1,2 @@
+import _toConsumableArray from "@babel/runtime/helpers/esm/toConsumableArray";
 import _defineProperty from "@babel/runtime/helpers/esm/defineProperty";
@@ -7,7 +8,35 @@
 
-export function getLoaderContext(context, options) {
-  return _objectSpread({
-    fetch: typeof window !== 'undefined' && window.fetch
+export function getLoaderContext(context, options, previousContext) {
+  if (previousContext) {
+    return previousContext;
+  }
+
+  context = _objectSpread({
+    fetch: context.fetch || typeof window !== 'undefined' && window.fetch
   }, context);
+
+  if (!Array.isArray(context.loaders)) {
+    context.loaders = null;
+  }
+
+  return context;
 }
+export function getLoaders(loaders, context) {
+  if (!context && !Array.isArray(loaders)) {
+    return loaders;
+  }
+
+  var candidateLoaders;
+
+  if (loaders) {
+    candidateLoaders = Array.isArray(loaders) ? loaders : [loaders];
+  }
+
+  if (context && context.loaders) {
+    var contextLoaders = Array.isArray(context.loaders) ? context.loaders : [context.loaders];
+    candidateLoaders = candidateLoaders ? [].concat(_toConsumableArray(candidateLoaders), _toConsumableArray(contextLoaders)) : contextLoaders;
+  }
+
+  return candidateLoaders && candidateLoaders.length ? candidateLoaders : null;
+}
 //# sourceMappingURL=get-loader-context.js.map

dist/esm/lib/loader-utils/normalize-loader.js

@@ -17,7 +17,7 @@ import _defineProperty from "@babel/runtime/helpers/esm/defineProperty";
 
-  var hasParser = loader.parseTextSync || loader.parseSync || loader.parse || loader.loadAndParse || loader.parseStream || loader.parseInBatches || loader.worker;
+  var hasParser = loader.parseTextSync || loader.parseSync || loader.parse || loader.parseStream || loader.parseInBatches || loader.worker;
   return hasParser;
 }
 export function normalizeLoader(loader) {
-  assert(isLoaderObject(loader));
+  assert(isLoaderObject(loader), 'invalid loader');
   var options;
@@ -24,0 +24,0 @@

dist/esm/lib/parse-in-batches-sync.js

 import _regeneratorRuntime from "@babel/runtime/regenerator";
 import _asyncToGenerator from "@babel/runtime/helpers/esm/asyncToGenerator";
 import { isLoaderObject } from './loader-utils/normalize-loader';
-import { mergeLoaderAndUserOptions } from './loader-utils/normalize-options';
+import { mergeOptions } from './loader-utils/merge-options';
 import { getIteratorFromData } from './loader-utils/get-data';
@@ -26,5 +26,6 @@ import { getLoaderContext } from './loader-utils/get-loader-context';
             loader = selectLoader(loaders, url, null);
-            options = mergeLoaderAndUserOptions(options, loader);
+            options = mergeOptions(loader, options);
             context = getLoaderContext({
-              url: url
+              url: url,
+              loaders: loaders
             }, options);
@@ -31,0 +32,0 @@ return _context.abrupt("return", parseWithLoaderInBatchesSync(loader, data, options, context));

dist/esm/lib/parse-in-batches.js

 import _regeneratorRuntime from "@babel/runtime/regenerator";
 import _asyncToGenerator from "@babel/runtime/helpers/esm/asyncToGenerator";
 import { isLoaderObject } from './loader-utils/normalize-loader';
-import { mergeLoaderAndUserOptions } from './loader-utils/normalize-options';
+import { mergeOptions } from './loader-utils/merge-options';
 import { getAsyncIteratorFromData } from './loader-utils/get-data';
@@ -26,5 +26,6 @@ import { getLoaderContext } from './loader-utils/get-loader-context';
             loader = selectLoader(loaders, url, null);
-            options = mergeLoaderAndUserOptions(options, loader);
+            options = mergeOptions(loader, options);
             context = getLoaderContext({
-              url: url
+              url: url,
+              loaders: loaders
             }, options);
@@ -31,0 +32,0 @@ return _context.abrupt("return", parseWithLoaderInBatches(loader, data, options, context));

dist/esm/lib/parse-sync.js

 import { selectLoader } from './select-loader';
 import { isLoaderObject } from './loader-utils/normalize-loader';
-import { mergeLoaderAndUserOptions } from './loader-utils/normalize-options';
+import { mergeOptions } from './loader-utils/merge-options';
 import { getArrayBufferOrStringFromDataSync } from './loader-utils/get-data';
-import { getLoaderContext } from './loader-utils/get-loader-context';
-export function parseSync(data, loaders, options, url) {
+import { getLoaders, getLoaderContext } from './loader-utils/get-loader-context';
+export function parseSync(data, loaders, options, context) {
   if (!Array.isArray(loaders) && !isLoaderObject(loaders)) {
-    url = options;
+    context = options;
     options = loaders;
@@ -13,4 +13,13 @@ loaders = null;
 
-  var loader = selectLoader(loaders, url, data);
+  var url = '';
 
+  if (typeof context === 'string') {
+    url = context;
+    context = null;
+  }
+
+  options = options || {};
+  var candidateLoaders = getLoaders(loaders, context);
+  var loader = selectLoader(candidateLoaders, url, data);
+
   if (!loader) {
@@ -20,6 +29,7 @@ return null;
 
-  options = mergeLoaderAndUserOptions(options, loader);
-  var context = getLoaderContext({
+  options = mergeOptions(loader, options);
+  context = getLoaderContext({
     url: url,
-    parseSync: parseSync
+    parseSync: parseSync,
+    loaders: loaders
   }, options);
@@ -40,4 +50,4 @@ return parseWithLoaderSync(loader, data, options, context);
 
-  throw new Error("Could not parse ".concat(context.url || 'data', " using ").concat(loader.name, " loader"));
+  throw new Error("".concat(loader.name, ": Loader does not support 'parseSync' (").concat(context.url || 'data', ")"));
 }
 //# sourceMappingURL=parse-sync.js.map

dist/esm/lib/parse.js

@@ -5,6 +5,6 @@ import _regeneratorRuntime from "@babel/runtime/regenerator";
 import { isLoaderObject } from './loader-utils/normalize-loader';
-import { mergeLoaderAndUserOptions } from './loader-utils/normalize-options';
+import { mergeOptions } from './loader-utils/merge-options';
 import { getUrlFromData } from './loader-utils/get-data';
 import { getArrayBufferOrStringFromData } from './loader-utils/get-data';
-import { getLoaderContext } from './loader-utils/get-loader-context';
+import { getLoaders, getLoaderContext } from './loader-utils/get-loader-context';
 import parseWithWorker from './loader-utils/parse-with-worker';
@@ -17,4 +17,4 @@ import { selectLoader } from './select-loader';
 function _parse() {
-  _parse = _asyncToGenerator(_regeneratorRuntime.mark(function _callee(data, loaders, options, url) {
-    var autoUrl, loader, context;
+  _parse = _asyncToGenerator(_regeneratorRuntime.mark(function _callee(data, loaders, options, context) {
+    var url, autoUrl, candidateLoaders, loader;
     return _regeneratorRuntime.wrap(function _callee$(_context) {
@@ -24,4 +24,4 @@ while (1) {
           case 0:
-            if (loaders && !Array.isArray(loaders) && !isLoaderObject(loaders)) {
-              url = options;
+            if (!Array.isArray(loaders) && !isLoaderObject(loaders)) {
+              context = options;
               options = loaders;
@@ -31,17 +31,35 @@ loaders = null;
 
+            url = '';
+
+            if (typeof context === 'string') {
+              url = context;
+              context = null;
+            }
+
             options = options || {};
             autoUrl = getUrlFromData(data, url);
-            loader = selectLoader(loaders, autoUrl, data);
-            options = mergeLoaderAndUserOptions(options, loader);
+            candidateLoaders = getLoaders(loaders, context);
+            loader = selectLoader(candidateLoaders, autoUrl, data);
+
+            if (loader) {
+              _context.next = 9;
+              break;
+            }
+
+            return _context.abrupt("return", null);
+
+          case 9:
+            options = mergeOptions(loader, options);
             context = getLoaderContext({
               url: autoUrl,
-              parse: parse
-            }, options);
-            _context.next = 8;
+              parse: parse,
+              loaders: candidateLoaders
+            }, options, context);
+            _context.next = 13;
             return parseWithLoader(loader, data, options, context);
 
-          case 8:
+          case 13:
             return _context.abrupt("return", _context.sent);
 
-          case 9:
+          case 14:
           case "end":
@@ -48,0 +66,0 @@ return _context.stop();

dist/esm/lib/select-loader.js

 import _typeof from "@babel/runtime/helpers/esm/typeof";
+import _toConsumableArray from "@babel/runtime/helpers/esm/toConsumableArray";
 import { getRegisteredLoaders } from './register-loaders';
@@ -21,3 +22,3 @@ import { normalizeLoader } from './loader-utils/normalize-loader';
 
-  loaders = loaders || getRegisteredLoaders();
+  loaders = [].concat(_toConsumableArray(loaders || []), _toConsumableArray(getRegisteredLoaders()));
   normalizeLoaders(loaders);
@@ -34,3 +35,13 @@ url = url.replace(/\?.*/, '');
 
-    throw new Error("No valid loader found for ".concat(url));
+    var message = 'No valid loader found';
+
+    if (data) {
+      message += " for data starting with \"".concat(getFirstCharacters(data), "\"");
+    }
+
+    if (url) {
+      message += " for ".concat(url);
+    }
+
+    throw new Error(message);
   }
@@ -199,2 +210,17 @@
 
+function getFirstCharacters(data) {
+  var length = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 5;
+
+  if (typeof data === 'string') {
+    return data.slice(0, length);
+  } else if (ArrayBuffer.isView(data)) {
+    return getMagicString(data.buffer, data.byteOffset, length);
+  } else if (data instanceof ArrayBuffer) {
+    var byteOffset = 0;
+    return getMagicString(data, byteOffset, length);
+  }
+
+  return '';
+}
+
 function getMagicString(arrayBuffer, byteOffset, length) {
@@ -201,0 +227,0 @@ if (arrayBuffer.byteLength <= byteOffset + length) {

package.json

 {
   "name": "@loaders.gl/core",
-  "version": "1.3.3",
+  "version": "2.0.0-alpha.1",
   "description": "Framework-independent loaders for 3D graphics formats",
@@ -55,3 +55,3 @@ "license": "MIT",
   },
-  "gitHead": "6a8d559e11613dc1dd94a12e4ea5df05c0184ae6"
+  "gitHead": "cff57d05c0495fa661119005cffd886ed6ed1025"
 }

src/index.js

@@ -31,4 +31,6 @@ import {parse} from './lib/parse';
 export {parseInBatchesSync} from './lib/parse-in-batches-sync';
-export {load, loadInBatches} from './lib/load';
 
+export {load} from './lib/load';
+export {loadInBatches} from './lib/load-in-batches';
+
 // ENCODING AND SAVING
@@ -35,0 +37,0 @@ export {encode, encodeSync, encodeInBatches} from './lib/encode';

src/lib/fetch/fetch-file.browser.js

@@ -26,3 +26,3 @@ /* global FileReader, Headers */
 
-  url() {
+  get url() {
     // Note: This is just the file name without path information
@@ -29,0 +29,0 @@ // Note: File has `name` field but the Blob baseclass does not

src/lib/load.js

 import {isFileReadable} from '../javascript-utils/is-type';
 import {fetchFile} from './fetch/fetch-file';
 import {isLoaderObject} from './loader-utils/normalize-loader';
-import {mergeLoaderAndUserOptions} from './loader-utils/normalize-options';
-import {selectLoader} from './select-loader';
 
 import {parse} from './parse';
-import {parseInBatches} from './parse-in-batches';
 
-export async function loadInBatches(url, loaders, options) {
-  const response = await fetchFile(url, options);
-  return parseInBatches(response, loaders, options, url);
-}
-
 // Note: Load does duplicate a lot of parse.
-// Works like parse but can call `loadAndParse` for parsers that need to do their own loading
 // it can also call fetchFile on string urls, which `parse` won't do.
@@ -25,29 +16,19 @@ export async function load(url, loaders, options) {
 
-  // Extract a url for auto detection
-  const autoUrl = isFileReadable(url) ? url.name : url;
+  // at this point, `url` could be already loaded binary data
+  let data = url;
 
-  // Initial loader autodection (Use registered loaders if none provided)
-  // This only uses URL extensions to detect loaders.
-  const loader = selectLoader(loaders, autoUrl, null, {nothrow: true});
-
-  if (loader) {
-    // Some loaders do not separate reading and parsing of data (e.g ImageLoader)
-    // These can only be handled by `load`, not `parse`
-    // TODO - ImageLoaders can be rewritten to separate load and parse, phase out this variant?
-    if (loader.loadAndParse) {
-      const loaderOptions = mergeLoaderAndUserOptions(options, loader);
-      return await loader.loadAndParse(url, loaderOptions);
-    }
+  // url is a string, fetch the url
+  if (typeof url === 'string') {
+    data = await fetchFile(url, options);
   }
 
-  // at this point, data can be binary or text
-  let data = url;
-  if (isFileReadable(data) || typeof data === 'string') {
+  // URL is Blob or File, fetchFile handles it (alt: we could generate ObjectURL here)
+  if (isFileReadable(url)) {
+    // The fetch response object will contain blob.name
     data = await fetchFile(url, options);
+    url = null;
   }
 
-  // Fall back to parse
-  // Note: An improved round of autodetection is possible now that data has been loaded
-  // This means that another loader might be selected
-  return parse(data, loaders, options, url);
+  // Data is loaded (at least we have a `Response` object) so time to hand over to `parse`
+  return await parse(data, loaders, options, url);
 }

src/lib/loader-utils/get-loader-context.js

@@ -1,6 +0,42 @@
-export function getLoaderContext(context, options) {
-  return {
-    fetch: typeof window !== 'undefined' && window.fetch,
+// "sub" loaders invoked by other loaders get a "context" injected on `this`
+// The context will inject core methods like `parse` and contain information
+// about loaders and options passed in to the top-level `parse` call.
+
+export function getLoaderContext(context, options, previousContext) {
+  // For recursive calls, we already have a context
+  // TODO - add any additional loaders to context?
+  if (previousContext) {
+    return previousContext;
+  }
+  context = {
+    // TODO - determine how to inject fetch, fetch in options etc
+    fetch: context.fetch || (typeof window !== 'undefined' && window.fetch),
     ...context
   };
+
+  // Recursive loading does not use single loader
+  if (!Array.isArray(context.loaders)) {
+    context.loaders = null;
+  }
+
+  return context;
 }
+
+export function getLoaders(loaders, context) {
+  // A single non-array loader is force selected, but only on top-level (context === null)
+  if (!context && !Array.isArray(loaders)) {
+    return loaders;
+  }
+
+  // Create a merged list
+  let candidateLoaders;
+  if (loaders) {
+    candidateLoaders = Array.isArray(loaders) ? loaders : [loaders];
+  }
+  if (context && context.loaders) {
+    const contextLoaders = Array.isArray(context.loaders) ? context.loaders : [context.loaders];
+    candidateLoaders = candidateLoaders ? [...candidateLoaders, ...contextLoaders] : contextLoaders;
+  }
+  // If no loaders, return null to look in globally registered loaders
+  return candidateLoaders && candidateLoaders.length ? candidateLoaders : null;
+}

src/lib/loader-utils/normalize-loader.js

@@ -16,3 +16,2 @@ import assert from '../../utils/assert';
     loader.parse ||
-    loader.loadAndParse ||
     loader.parseStream || // TODO Replace with parseInBatches
@@ -27,3 +26,6 @@ loader.parseInBatches ||
 export function normalizeLoader(loader) {
-  assert(isLoaderObject(loader));
+  // This error is fairly easy to trigger by mixing up import statments etc
+  // So we make an exception and add a developer error message for this case
+  // To help new users from getting stuck here
+  assert(isLoaderObject(loader), 'invalid loader');
 
@@ -30,0 +32,0 @@ // NORMALIZE [LOADER, OPTIONS] => LOADER

src/lib/parse-in-batches-sync.js

 import {isLoaderObject} from './loader-utils/normalize-loader';
-import {mergeLoaderAndUserOptions} from './loader-utils/normalize-options';
+import {mergeOptions} from './loader-utils/merge-options';
 import {getIteratorFromData} from './loader-utils/get-data';
@@ -22,5 +22,5 @@ import {getLoaderContext} from './loader-utils/get-loader-context';
   // Normalize options
-  options = mergeLoaderAndUserOptions(options, loader);
+  options = mergeOptions(loader, options);
 
-  const context = getLoaderContext({url}, options);
+  const context = getLoaderContext({url, loaders}, options);
 
@@ -27,0 +27,0 @@ return parseWithLoaderInBatchesSync(loader, data, options, context);

src/lib/parse-in-batches.js

 import {isLoaderObject} from './loader-utils/normalize-loader';
-import {mergeLoaderAndUserOptions} from './loader-utils/normalize-options';
+import {mergeOptions} from './loader-utils/merge-options';
 import {getAsyncIteratorFromData} from './loader-utils/get-data';
@@ -21,5 +21,5 @@ import {getLoaderContext} from './loader-utils/get-loader-context';
   // Normalize options
-  options = mergeLoaderAndUserOptions(options, loader);
+  options = mergeOptions(loader, options);
 
-  const context = getLoaderContext({url}, options);
+  const context = getLoaderContext({url, loaders}, options);
 
@@ -26,0 +26,0 @@ return parseWithLoaderInBatches(loader, data, options, context);

src/lib/parse-sync.js

 import {selectLoader} from './select-loader';
 import {isLoaderObject} from './loader-utils/normalize-loader';
-import {mergeLoaderAndUserOptions} from './loader-utils/normalize-options';
+import {mergeOptions} from './loader-utils/merge-options';
 import {getArrayBufferOrStringFromDataSync} from './loader-utils/get-data';
-import {getLoaderContext} from './loader-utils/get-loader-context';
+import {getLoaders, getLoaderContext} from './loader-utils/get-loader-context';
 
-export function parseSync(data, loaders, options, url) {
+export function parseSync(data, loaders, options, context) {
   // Signature: parseSync(data, options, url)
   // Uses registered loaders
   if (!Array.isArray(loaders) && !isLoaderObject(loaders)) {
-    url = options;
+    context = options;
     options = loaders;
@@ -16,4 +16,15 @@ loaders = null;
 
-  // Chooses a loader and normalize it
-  const loader = selectLoader(loaders, url, data);
+  // DEPRECATED - backwards compatibility, last param can be URL...
+  let url = '';
+  if (typeof context === 'string') {
+    url = context;
+    context = null;
+  }
+
+  options = options || {};
+
+  // Chooses a loader (and normalizes it)
+  // Also use any loaders in the context, new loaders take priority
+  const candidateLoaders = getLoaders(loaders, context);
+  const loader = selectLoader(candidateLoaders, url, data);
   // Note: if nothrow option was set, it is possible that no loader was found, if so just return null
@@ -25,5 +36,5 @@ if (!loader) {
   // Normalize options
-  options = mergeLoaderAndUserOptions(options, loader);
+  options = mergeOptions(loader, options);
 
-  const context = getLoaderContext({url, parseSync}, options);
+  context = getLoaderContext({url, parseSync, loaders}, options);
 
@@ -46,3 +57,3 @@ return parseWithLoaderSync(loader, data, options, context);
   // TBD - If synchronous parser not available, return null
-  throw new Error(`Could not parse ${context.url || 'data'} using ${loader.name} loader`);
+  throw new Error(`${loader.name}: Loader does not support 'parseSync' (${context.url || 'data'})`);
 }

src/lib/parse.js

 import assert from '../utils/assert';
 import {isLoaderObject} from './loader-utils/normalize-loader';
-import {mergeLoaderAndUserOptions} from './loader-utils/normalize-options';
+import {mergeOptions} from './loader-utils/merge-options';
 import {getUrlFromData} from './loader-utils/get-data';
 import {getArrayBufferOrStringFromData} from './loader-utils/get-data';
-import {getLoaderContext} from './loader-utils/get-loader-context';
+import {getLoaders, getLoaderContext} from './loader-utils/get-loader-context';
 import parseWithWorker from './loader-utils/parse-with-worker';
 import {selectLoader} from './select-loader';
 
-export async function parse(data, loaders, options, url) {
-  // Signature: parse(data, options, url)
+export async function parse(data, loaders, options, context) {
+  // Signature: parse(data, options, context | url)
   // Uses registered loaders
-  if (loaders && !Array.isArray(loaders) && !isLoaderObject(loaders)) {
-    url = options;
+  if (!Array.isArray(loaders) && !isLoaderObject(loaders)) {
+    context = options;
     options = loaders;
@@ -19,2 +19,9 @@ loaders = null;
 
+  // DEPRECATED - backwards compatibility, last param can be URL...
+  let url = '';
+  if (typeof context === 'string') {
+    url = context;
+    context = null;
+  }
+
   options = options || {};
@@ -25,9 +32,16 @@
 
-  // Chooses a loader and normalize it
-  const loader = selectLoader(loaders, autoUrl, data);
+  // Chooses a loader (and normalizes it)
+  // Also use any loaders in the context, new loaders take priority
+  const candidateLoaders = getLoaders(loaders, context);
+  const loader = selectLoader(candidateLoaders, autoUrl, data);
+  // Note: if nothrow option was set, it is possible that no loader was found, if so just return null
+  if (!loader) {
+    return null;
+  }
 
   // Normalize options
-  options = mergeLoaderAndUserOptions(options, loader);
+  options = mergeOptions(loader, options);
 
-  const context = getLoaderContext({url: autoUrl, parse}, options);
+  // Get a context (if already present, will be unchanged)
+  context = getLoaderContext({url: autoUrl, parse, loaders: candidateLoaders}, options, context);
 
@@ -64,4 +78,3 @@ return await parseWithLoader(loader, data, options, context);
   // TBD - If asynchronous parser not available, return null
-  // => This loader does not work on loaded data and only supports `loadAndParseAsync`
   return assert(false);
 }

src/lib/select-loader.js

@@ -14,2 +14,3 @@ import {getRegisteredLoaders} from './register-loaders';
 
+// eslint-disable-next-line complexity
 export function selectLoader(loaders, url = '', data = null, {nothrow = false} = {}) {
@@ -27,3 +28,3 @@ url = url || '';
   // If no loaders provided, get the registered loaders
-  loaders = loaders || getRegisteredLoaders();
+  loaders = [...(loaders || []), ...getRegisteredLoaders()];
   normalizeLoaders(loaders);
@@ -41,3 +42,10 @@
     }
-    throw new Error(`No valid loader found for ${url}`);
+    let message = 'No valid loader found';
+    if (data) {
+      message += ` for data starting with "${getFirstCharacters(data)}"`;
+    }
+    if (url) {
+      message += ` for ${url}`;
+    }
+    throw new Error(message);
   }
@@ -128,2 +136,15 @@
 
+function getFirstCharacters(data, length = 5) {
+  if (typeof data === 'string') {
+    return data.slice(0, length);
+  } else if (ArrayBuffer.isView(data)) {
+    // Typed Arrays can have offsets into underlying buffer
+    return getMagicString(data.buffer, data.byteOffset, length);
+  } else if (data instanceof ArrayBuffer) {
+    const byteOffset = 0;
+    return getMagicString(data, byteOffset, length);
+  }
+  return '';
+}
+
 function getMagicString(arrayBuffer, byteOffset, length) {
@@ -130,0 +151,0 @@ if (arrayBuffer.byteLength <= byteOffset + length) {

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