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@babel/core - npm Package Compare versions

Comparing version 7.0.0-beta.40 to 7.0.0-beta.41

lib/config/full.js
lib/config/helpers/config-api.js
lib/config/item.js
lib/config/partial.js
lib/config/util.js

16

lib/config/config-chain.js

@@ -69,2 +69,3 @@ "use strict";

if (!programmaticChain) return null;
var ignore, babelrc;
var fileChain = emptyChain();

@@ -75,6 +76,7 @@

var _findRelativeConfig = (0, _files.findRelativeConfig)(_filename, context.envName),
ignore = _findRelativeConfig.ignore,
config = _findRelativeConfig.config;
var _findRelativeConfig = (0, _files.findRelativeConfig)(_filename, context.envName);
ignore = _findRelativeConfig.ignore;
babelrc = _findRelativeConfig.config;
if (ignore && shouldIgnore(context, ignore.ignore, null, ignore.dirname)) {

@@ -84,4 +86,4 @@ return null;

if (config) {
var result = loadFileChain(config, context);
if (babelrc) {
var result = loadFileChain(babelrc, context);
if (!result) return null;

@@ -98,3 +100,5 @@ mergeChain(fileChain, result);

return normalizeOptions(o);
})
}),
ignore: ignore || undefined,
babelrc: babelrc || undefined
};

@@ -101,0 +105,0 @@ }

38

lib/config/config-descriptors.js

@@ -6,5 +6,8 @@ "use strict";

exports.createUncachedDescriptors = createUncachedDescriptors;
exports.createDescriptor = createDescriptor;
var _files = require("./files");
var _item2 = require("./item");
var _caching = require("./caching");

@@ -102,5 +105,5 @@

var descriptors = items.map(function (item, index) {
return createDescriptor(item, type === "plugin" ? _files.loadPlugin : _files.loadPreset, dirname, {
index: index,
alias: alias,
return createDescriptor(item, dirname, {
type: type,
alias: alias + "$" + index,
ownPass: !!ownPass

@@ -113,6 +116,12 @@ });

function createDescriptor(pair, resolver, dirname, _ref) {
var index = _ref.index,
function createDescriptor(pair, dirname, _ref) {
var type = _ref.type,
alias = _ref.alias,
ownPass = _ref.ownPass;
var desc = (0, _item2.getItemDescriptor)(pair);
if (desc) {
return desc;
}
var name;

@@ -135,5 +144,13 @@ var options;

var file = undefined;
var filepath = null;
if (typeof value === "string") {
if (typeof type !== "string") {
throw new Error("To resolve a string-based item, the type of item must be given");
}
var resolver = type === "plugin" ? _files.loadPlugin : _files.loadPreset;
var _request = value;
var _resolver = resolver(value, dirname);

@@ -143,2 +160,6 @@

value = _resolver.value;
file = {
request: _request,
resolved: filepath
};
}

@@ -163,3 +184,3 @@

if (filepath !== null && typeof value === "object" && value) {
throw new Error("Plugin/Preset files are not allowed to export objects, only functions.");
throw new Error("Plugin/Preset files are not allowed to export objects, only functions. In " + filepath);
}

@@ -169,7 +190,8 @@

name: name,
alias: filepath || alias + "$" + index,
alias: filepath || alias,
value: value,
options: options,
dirname: dirname,
ownPass: ownPass
ownPass: ownPass,
file: file
};

@@ -176,0 +198,0 @@ }

14

lib/config/files/configuration.js

@@ -19,2 +19,4 @@ "use strict";

var _configApi = _interopRequireDefault(require("../helpers/config-api"));
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

@@ -131,13 +133,3 @@

if (typeof options === "function") {
options = options({
cache: cache.simple(),
env: function env() {
return cache.using(function (data) {
return data.envName;
});
},
async: function async() {
return false;
}
});
options = options((0, _configApi.default)(cache));
if (!cache.configured()) throwConfigError();

@@ -144,0 +136,0 @@ }

277

lib/config/index.js
"use strict";
exports.__esModule = true;
exports.default = loadConfig;
exports.loadOptions = loadOptions;
exports.OptionManager = exports.loadPartialConfig = void 0;
var _path = _interopRequireDefault(require("path"));
var _full = _interopRequireDefault(require("./full"));
var context = _interopRequireWildcard(require("../index"));
exports.default = _full.default;
var _plugin = _interopRequireDefault(require("./plugin"));
var _partial = require("./partial");
var _merge = _interopRequireDefault(require("lodash/merge"));
exports.loadPartialConfig = _partial.loadPartialConfig;
var _configChain = require("./config-chain");
var _traverse = _interopRequireDefault(require("@babel/traverse"));
var _clone = _interopRequireDefault(require("lodash/clone"));
var _caching = require("./caching");
var _environment = require("./helpers/environment");
var _options = require("./validation/options");
var _plugins = require("./validation/plugins");
function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = Object.defineProperty && Object.getOwnPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : {}; if (desc.get || desc.set) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } } newObj.default = obj; return newObj; } }
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
function loadConfig(inputOpts) {
if (inputOpts != null && (typeof inputOpts !== "object" || Array.isArray(inputOpts))) {
throw new Error("Babel options must be an object, null, or undefined");
}
var args = inputOpts ? (0, _options.validate)("arguments", inputOpts) : {};
var _args$envName = args.envName,
envName = _args$envName === void 0 ? (0, _environment.getEnv)() : _args$envName,
_args$cwd = args.cwd,
cwd = _args$cwd === void 0 ? "." : _args$cwd;
var absoluteCwd = _path.default.resolve(cwd);
var context = {
filename: args.filename ? _path.default.resolve(cwd, args.filename) : null,
cwd: absoluteCwd,
envName: envName
};
var configChain = (0, _configChain.buildRootChain)(args, context);
if (!configChain) return null;
var optionDefaults = {};
var options = {};
var passes = [[]];
try {
var ignored = function recurseDescriptors(config, pass) {
var plugins = config.plugins.map(function (descriptor) {
return loadPluginDescriptor(descriptor, context);
});
var presets = config.presets.map(function (descriptor) {
return {
preset: loadPresetDescriptor(descriptor, context),
pass: descriptor.ownPass ? [] : pass
};
});
if (presets.length > 0) {
passes.splice.apply(passes, [1, 0].concat(presets.map(function (o) {
return o.pass;
}).filter(function (p) {
return p !== pass;
})));
for (var _iterator = presets, _isArray = Array.isArray(_iterator), _i = 0, _iterator = _isArray ? _iterator : _iterator[Symbol.iterator]();;) {
var _ref2;
if (_isArray) {
if (_i >= _iterator.length) break;
_ref2 = _iterator[_i++];
} else {
_i = _iterator.next();
if (_i.done) break;
_ref2 = _i.value;
}
var _ref3 = _ref2;
var _preset = _ref3.preset,
_pass2 = _ref3.pass;
if (!_preset) return true;
var _ignored2 = recurseDescriptors({
plugins: _preset.plugins,
presets: _preset.presets
}, _pass2);
if (_ignored2) return true;
_preset.options.forEach(function (opts) {
(0, _merge.default)(optionDefaults, opts);
});
}
}
if (plugins.length > 0) {
pass.unshift.apply(pass, plugins);
}
}({
plugins: configChain.plugins,
presets: configChain.presets
}, passes[0]);
if (ignored) return null;
configChain.options.forEach(function (opts) {
(0, _merge.default)(options, opts);
});
} catch (e) {
if (!/^\[BABEL\]/.test(e.message)) {
e.message = "[BABEL] " + (args.filename || "unknown") + ": " + e.message;
}
throw e;
}
var opts = (0, _merge.default)(optionDefaults, options);
opts.babelrc = false;
opts.plugins = passes[0];
opts.presets = passes.slice(1).filter(function (plugins) {
return plugins.length > 0;
}).map(function (plugins) {
return {
plugins: plugins
};
});
opts.passPerPreset = opts.presets.length > 0;
opts.envName = envName;
opts.cwd = absoluteCwd;
return {
options: opts,
passes: passes
};
function loadOptions(opts) {
var config = (0, _full.default)(opts);
return config ? config.options : null;
}
var loadDescriptor = (0, _caching.makeWeakCache)(function (_ref4, cache) {
var value = _ref4.value,
options = _ref4.options,
dirname = _ref4.dirname,
alias = _ref4.alias;
if (options === false) throw new Error("Assertion failure");
options = options || {};
var item = value;
var OptionManager = function () {
function OptionManager() {}
if (typeof value === "function") {
var api = Object.assign(Object.create(context), {
cache: cache.simple(),
env: function env() {
return cache.using(function (data) {
return data.envName;
});
},
async: function async() {
return false;
}
});
var _proto = OptionManager.prototype;
try {
item = value(api, options, dirname);
} catch (e) {
if (alias) {
e.message += " (While processing: " + JSON.stringify(alias) + ")";
}
throw e;
}
}
if (!item || typeof item !== "object") {
throw new Error("Plugin/Preset did not return an object.");
}
if (typeof item.then === "function") {
throw new Error("You appear to be using an async plugin, " + "which your current version of Babel does not support." + "If you're using a published plugin, " + "you may need to upgrade your @babel/core version.");
}
return {
value: item,
options: options,
dirname: dirname,
alias: alias
_proto.init = function init(opts) {
return loadOptions(opts);
};
});
function loadPluginDescriptor(descriptor, context) {
if (descriptor.value instanceof _plugin.default) {
if (descriptor.options) {
throw new Error("Passed options to an existing Plugin instance will not work.");
}
return OptionManager;
}();
return descriptor.value;
}
return instantiatePlugin(loadDescriptor(descriptor, context), context);
}
var instantiatePlugin = (0, _caching.makeWeakCache)(function (_ref5, cache) {
var value = _ref5.value,
options = _ref5.options,
dirname = _ref5.dirname,
alias = _ref5.alias;
var pluginObj = (0, _plugins.validatePluginObject)(value);
var plugin = Object.assign({}, pluginObj);
if (plugin.visitor) {
plugin.visitor = _traverse.default.explode((0, _clone.default)(plugin.visitor));
}
if (plugin.inherits) {
var inheritsDescriptor = {
name: undefined,
alias: alias + "$inherits",
value: plugin.inherits,
options: options,
dirname: dirname
};
var inherits = cache.invalidate(function (data) {
return loadPluginDescriptor(inheritsDescriptor, data);
});
plugin.pre = chain(inherits.pre, plugin.pre);
plugin.post = chain(inherits.post, plugin.post);
plugin.manipulateOptions = chain(inherits.manipulateOptions, plugin.manipulateOptions);
plugin.visitor = _traverse.default.visitors.merge([inherits.visitor || {}, plugin.visitor || {}]);
}
return new _plugin.default(plugin, options, alias);
});
var loadPresetDescriptor = function loadPresetDescriptor(descriptor, context) {
return (0, _configChain.buildPresetChain)(instantiatePreset(loadDescriptor(descriptor, context)), context);
};
var instantiatePreset = (0, _caching.makeWeakCache)(function (_ref6) {
var value = _ref6.value,
dirname = _ref6.dirname,
alias = _ref6.alias;
return {
options: (0, _options.validate)("preset", value),
alias: alias,
dirname: dirname
};
});
function chain(a, b) {
var fns = [a, b].filter(Boolean);
if (fns.length <= 1) return fns[0];
return function () {
for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {
args[_key] = arguments[_key];
}
for (var _iterator2 = fns, _isArray2 = Array.isArray(_iterator2), _i2 = 0, _iterator2 = _isArray2 ? _iterator2 : _iterator2[Symbol.iterator]();;) {
var _ref7;
if (_isArray2) {
if (_i2 >= _iterator2.length) break;
_ref7 = _iterator2[_i2++];
} else {
_i2 = _iterator2.next();
if (_i2.done) break;
_ref7 = _i2.value;
}
var _fn = _ref7;
_fn.apply(this, args);
}
};
}
exports.OptionManager = OptionManager;

3

lib/config/validation/options.js

@@ -6,2 +6,4 @@ "use strict";

var _plugin = _interopRequireDefault(require("../plugin"));
var _removed = _interopRequireDefault(require("./removed"));

@@ -49,3 +51,2 @@

sourceMap: _optionAssertions.assertSourceMaps,
sourceMapTarget: _optionAssertions.assertString,
sourceFileName: _optionAssertions.assertString,

@@ -52,0 +53,0 @@ sourceRoot: _optionAssertions.assertString,

6

lib/config/validation/removed.js

@@ -43,3 +43,3 @@ "use strict";

sourceMapName: {
message: "Use the `sourceMapTarget` option"
message: "The `sourceMapName` option has been removed because it makes more sense for the tooling that calls Babel to assign `map.file` themselves."
},

@@ -59,4 +59,8 @@ stage: {

message: "Generated plugin metadata is always included in the output result"
},
sourceMapTarget: {
version: 6,
message: "The `sourceMapTarget` option has been removed because it makes more sense for the tooling that calls Babel to assign `map.file` themselves."
}
};
exports.default = _default;

32

lib/index.js
"use strict";
exports.__esModule = true;
exports.loadOptions = loadOptions;
exports.Plugin = Plugin;
exports.types = exports.DEFAULT_EXTENSIONS = exports.OptionManager = exports.getEnv = exports.version = exports.resolvePreset = exports.resolvePlugin = exports.parse = exports.transformFromAstSync = exports.transformFromAst = exports.transformFileSync = exports.transformFile = exports.transformSync = exports.transform = exports.template = exports.traverse = exports.buildExternalHelpers = exports.File = void 0;
exports.types = exports.DEFAULT_EXTENSIONS = exports.createConfigItem = exports.OptionManager = exports.loadOptions = exports.loadPartialConfig = exports.getEnv = exports.version = exports.resolvePreset = exports.resolvePlugin = exports.parse = exports.transformFromAstSync = exports.transformFromAst = exports.transformFileSync = exports.transformFile = exports.transformSync = exports.transform = exports.template = exports.traverse = exports.buildExternalHelpers = exports.File = void 0;

@@ -41,4 +40,12 @@ var _file = _interopRequireDefault(require("./transformation/file/file"));

var _config = _interopRequireDefault(require("./config"));
var _config = require("./config");
exports.loadPartialConfig = _config.loadPartialConfig;
exports.loadOptions = _config.loadOptions;
exports.OptionManager = _config.OptionManager;
var _item = require("./config/item");
exports.createConfigItem = _item.createConfigItem;
var _transform = _interopRequireDefault(require("./transform"));

@@ -76,21 +83,2 @@

function loadOptions(opts) {
var config = (0, _config.default)(opts);
return config ? config.options : null;
}
var OptionManager = function () {
function OptionManager() {}
var _proto = OptionManager.prototype;
_proto.init = function init(opts) {
return loadOptions(opts);
};
return OptionManager;
}();
exports.OptionManager = OptionManager;
function Plugin(alias) {

@@ -97,0 +85,0 @@ throw new Error("The (" + alias + ") Babel 5 plugin is being run with an unsupported Babel version.");

8

lib/tools/build-external-helpers.js

@@ -14,2 +14,4 @@ "use strict";

var _templateObject = _taggedTemplateLiteralLoose(["\n (function (root, factory) {\n if (typeof define === \"function\" && define.amd) {\n define(AMD_ARGUMENTS, factory);\n } else if (typeof exports === \"object\") {\n factory(COMMON_ARGUMENTS);\n } else {\n factory(BROWSER_ARGUMENTS);\n }\n })(UMD_ROOT, function (FACTORY_PARAMETERS) {\n FACTORY_BODY\n });\n "], ["\n (function (root, factory) {\n if (typeof define === \"function\" && define.amd) {\n define(AMD_ARGUMENTS, factory);\n } else if (typeof exports === \"object\") {\n factory(COMMON_ARGUMENTS);\n } else {\n factory(BROWSER_ARGUMENTS);\n }\n })(UMD_ROOT, function (FACTORY_PARAMETERS) {\n FACTORY_BODY\n });\n "]);
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

@@ -19,4 +21,8 @@

var buildUmdWrapper = (0, _template.default)("\n (function (root, factory) {\n if (typeof define === \"function\" && define.amd) {\n define(AMD_ARGUMENTS, factory);\n } else if (typeof exports === \"object\") {\n factory(COMMON_ARGUMENTS);\n } else {\n factory(BROWSER_ARGUMENTS);\n }\n })(UMD_ROOT, function (FACTORY_PARAMETERS) {\n FACTORY_BODY\n });\n");
function _taggedTemplateLiteralLoose(strings, raw) { strings.raw = raw; return strings; }
var buildUmdWrapper = function buildUmdWrapper(replacements) {
return (0, _template.default)(_templateObject)(replacements);
};
function buildGlobal(whitelist) {

@@ -23,0 +29,0 @@ var namespace = t.identifier("babelHelpers");

5

lib/transformation/index.js

@@ -45,5 +45,6 @@ "use strict";

options: opts,
ast: opts.ast !== false ? file.ast : null,
ast: opts.ast === true ? file.ast : null,
code: outputCode === undefined ? null : outputCode,
map: outputMap === undefined ? null : outputMap
map: outputMap === undefined ? null : outputMap,
sourceType: file.ast.program.sourceType
};

@@ -50,0 +51,0 @@ }

4

lib/transformation/normalize-file.js

@@ -117,2 +117,6 @@ "use strict";

} catch (err) {
if (err.code === "BABEL_PARSER_SOURCETYPE_MODULE_REQUIRED") {
err.message += "\nConsider renaming the file to '.mjs', or setting sourceType:module " + "or sourceType:unambiguous in your Babel config for this file.";
}
var loc = err.loc,

@@ -119,0 +123,0 @@ missingPlugin = err.missingPlugin;

3

lib/transformation/normalize-opts.js

@@ -25,4 +25,2 @@ "use strict";

sourceFileName = _config$options$sourc4 === void 0 ? filenameRelative : _config$options$sourc4,
_config$options$sourc5 = _config$options.sourceMapTarget,
sourceMapTarget = _config$options$sourc5 === void 0 ? filenameRelative : _config$options$sourc5,
_config$options$comme = _config$options.comments,

@@ -49,3 +47,2 @@ comments = _config$options$comme === void 0 ? true : _config$options$comme,

sourceMaps: sourceMaps,
sourceMapTarget: sourceMapTarget,
sourceRoot: sourceRoot,

@@ -52,0 +49,0 @@ sourceFileName: sourceFileName

10

lib/transformation/util/missing-plugin-helper.js

@@ -118,2 +118,12 @@ "use strict";

},
logicalAssignment: {
syntax: {
name: "@babel/plugin-syntax-logical-assignment-operators",
url: "https://git.io/vAlBp"
},
transform: {
name: "@babel/plugin-proposal-logical-assignment-operators",
url: "https://git.io/vAlRe"
}
},
nullishCoalescingOperator: {

@@ -120,0 +130,0 @@ syntax: {

23

package.json
{
"name": "@babel/core",
"version": "7.0.0-beta.40",
"version": "7.0.0-beta.41",
"description": "Babel compiler core.",

@@ -31,11 +31,11 @@ "main": "./lib/index.js",

"dependencies": {
"@babel/code-frame": "7.0.0-beta.40",
"@babel/generator": "7.0.0-beta.40",
"@babel/helpers": "7.0.0-beta.40",
"@babel/template": "7.0.0-beta.40",
"@babel/traverse": "7.0.0-beta.40",
"@babel/types": "7.0.0-beta.40",
"babylon": "7.0.0-beta.40",
"@babel/code-frame": "7.0.0-beta.41",
"@babel/generator": "7.0.0-beta.41",
"@babel/helpers": "7.0.0-beta.41",
"@babel/template": "7.0.0-beta.41",
"@babel/traverse": "7.0.0-beta.41",
"@babel/types": "7.0.0-beta.41",
"babylon": "7.0.0-beta.41",
"convert-source-map": "^1.1.0",
"debug": "^3.0.1",
"debug": "^3.1.0",
"json5": "^0.5.0",

@@ -45,8 +45,9 @@ "lodash": "^4.2.0",

"resolve": "^1.3.2",
"semver": "^5.4.1",
"source-map": "^0.5.0"
},
"devDependencies": {
"@babel/helper-transform-fixture-test-runner": "7.0.0-beta.40",
"@babel/register": "7.0.0-beta.40"
"@babel/helper-transform-fixture-test-runner": "7.0.0-beta.41",
"@babel/register": "7.0.0-beta.41"
}
}

76

README.md

@@ -96,3 +96,3 @@ # @babel/core

## babel.transformFromAst(ast: Object, code?: string, [options?](#options): Object, callback: Function)
## babel.transformFromAst(ast: Object, code?: string, [options?](#options): Object, callback: Function): FileNode | null

@@ -127,3 +127,76 @@ Given an [AST](https://astexplorer.net/), transform it.

## babel.parse(code: string, [options?](#options): Object)
Given some code, parse it using Babel's standard behavior. Referenced presets and
plugins will be loaded such that optional syntax plugins are automatically
enabled.
## Advanced APIs
Many systems that wrap Babel like to automatically inject plugins and presets,
or override options. To accomplish this goal, Babel exposes several functions
that aid in loading the configuration part-way without transforming.
### babel.loadOptions([options?](#options): Object)
Resolve Babel's options fully, resulting in an options object where:
* `opts.plugins` is a full list of `Plugin` instances.
* `opts.presets` is empty and all presets are flattened into `opts`.
* It can be safely passed back to Babel. Fields like `babelrc` have been set to
false so that later calls to Babel will not make a second attempt to load
config files.
`Plugin` instances aren't meant to be manipulated directly, but often
callers will serialize this `opts` to JSON to use it as a cache key representing
the options Babel has received. Caching on this isn't 100% guaranteed to
invalidate properly, but it is the best we have at the moment.
### babel.loadPartialConfig([options?](#options): Object): PartialConfig
To allow systems to easily manipulate and validate a user's config, this function
resolves the plugins and presets and proceeds no further. The expectation is
that callers will take the config's `.options`, manipulate it as then see fit
and pass it back to Babel again.
* `babelrc: string | void` - The path of the `.babelrc` file, if there was one.
* `babelignore: string | void` - The path of the `.babelignore` file, if there was one.
* `options: ValidatedOptions` - The partially resolved options, which can be manipulated and passed back to Babel again.
* `plugins: Array<ConfigItem>` - See below.
* `presets: Array<ConfigItem>` - See below.
* It can be safely passed back to Babel. Fields like `babelrc` have been set
to false so that later calls to Babel will not make a second attempt to
load config files.
* `hasFilesystemConfig(): boolean` - Check if the resolved config loaded any settings from the filesystem.
[`ConfigItem`](#configitem-type) instances expose properties to introspect the values, but each
item should be treated as immutable. If changes are desired, the item should be
removed from the list and replaced with either a normal Babel config value, or
with a replacement item created by `babel.createConfigItem`. See that
function for information about `ConfigItem` fields.
### babel.createConfigItem(value: string | {} | Function | [string | {} | Function, {} | void], { dirname?: string, type?: "preset" | "plugin" }): ConfigItem
Allows build tooling to create and cache config items up front. If this function
is called multiple times for a given plugin, Babel will call the plugin's function itself
multiple times. If you have a clear set of expected plugins and presets to
inject, pre-constructing the config items would be recommended.
### `ConfigItem` type
Each `ConfigItem` exposes all of the information Babel knows. The fields are:
* `value: {} | Function` - The resolved value of the plugin.
* `options: {} | void` - The options object passed to the plugin.
* `dirname: string` - The path that the options are relative to.
* `name: string | void` - The name that the user gave the plugin instance, e.g. `plugins: [ ['env', {}, 'my-env'] ]`
* `file: Object | void` - Information about the plugin's file, if Babel knows it.
* `request: string` - The file that the user requested, e.g. `"@babel/env"`
* `resolved: string` - The full path of the resolved file, e.g. `"/tmp/node_modules/@babel/preset-env/lib/index.js"`
## Options

@@ -174,5 +247,4 @@

| `sourceMaps` | `false` | If truthy, adds a `map` property to returned output. If set to `"inline"`, a comment with a sourceMappingURL directive is added to the bottom of the returned code. If set to `"both"` then a `map` property is returned as well as a source map comment appended. **This does not emit sourcemap files by itself!** To have sourcemaps emitted using the CLI, you must pass it the `--source-maps` option |
| `sourceMapTarget` | `(filenameRelative)` | Set `file` on returned source map |
| `sourceRoot` | `(moduleRoot)` | The root from which all sources are relative |
| `sourceType` | `"module"` | Indicate the mode the code should be parsed in. Can be one of "script", "module", or "unambiguous". `"unambiguous"` will make Babel attempt to _guess_, based on the presence of ES6 `import` or `export` statements. Files with ES6 `import`s and `export`s are considered `"module"` and are otherwise `"script"`. |
| `wrapPluginVisitorMethod`| `null` | An optional callback that can be used to wrap visitor methods. **NOTE:** This is useful for things like introspection, and not really needed for implementing anything. Called as `wrapPluginVisitorMethod(pluginAlias, visitorType, callback)`.
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