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index.js
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index.js
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let babel;
try {
babel = require("@babel/core");
} catch (err) {
if (err.code === "MODULE_NOT_FOUND") {
err.message +=
"\n babel-loader@9 requires Babel 7.12+ (the package '@babel/core'). " +
"If you'd like to use Babel 6.x ('babel-core'), you should install 'babel-loader@7'.";
}
throw err;
}
// Since we've got the reverse bridge package at @babel/core@6.x, give
// people useful feedback if they try to use it alongside babel-loader.
if (/^6\./.test(babel.version)) {
throw new Error(
"\n babel-loader@9 will not work with the '@babel/core@6' bridge package. " +
"If you want to use Babel 6.x, install 'babel-loader@7'.",
);
}
const { version } = require("../package.json");
const cache = require("./cache");
const transform = require("./transform");
const injectCaller = require("./injectCaller");
const schema = require("./schema");
const { isAbsolute } = require("path");
const { promisify } = require("util");
function subscribe(subscriber, metadata, context) {
if (context[subscriber]) {
context[subscriber](metadata);
}
}
module.exports = makeLoader();
module.exports.custom = makeLoader;
function makeLoader(callback) {
const overrides = callback ? callback(babel) : undefined;
return function (source, inputSourceMap) {
// Make the loader async
const callback = this.async();
loader.call(this, source, inputSourceMap, overrides).then(
args => callback(null, ...args),
err => callback(err),
);
};
}
async function loader(source, inputSourceMap, overrides) {
const filename = this.resourcePath;
const logger = this.getLogger("babel-loader");
let loaderOptions = this.getOptions(schema);
if (loaderOptions.customize != null) {
if (!isAbsolute(loaderOptions.customize)) {
throw new Error(
"Customized loaders must be passed as absolute paths, since " +
"babel-loader has no way to know what they would be relative to.",
);
}
if (overrides) {
throw new Error(
"babel-loader's 'customize' option is not available when already " +
"using a customized babel-loader wrapper.",
);
}
logger.debug(`loading customize override: '${loaderOptions.customize}'`);
let override = require(loaderOptions.customize);
if (override.__esModule) override = override.default;
if (typeof override !== "function") {
throw new Error("Custom overrides must be functions.");
}
logger.debug("applying customize override to @babel/core");
overrides = override(babel);
}
let customOptions;
if (overrides && overrides.customOptions) {
logger.debug("applying overrides customOptions() to loader options");
const result = await overrides.customOptions.call(this, loaderOptions, {
source,
map: inputSourceMap,
});
customOptions = result.custom;
loaderOptions = result.loader;
}
// Deprecation handling
if ("forceEnv" in loaderOptions) {
this.emitWarning(
new Error(
"The option `forceEnv` has been removed in favor of `envName` in Babel 7.",
),
);
}
if (typeof loaderOptions.babelrc === "string") {
this.emitWarning(
new Error(
"The option `babelrc` should not be set to a string anymore in the babel-loader config. " +
"Please update your configuration and set `babelrc` to true or false.\n" +
"If you want to specify a specific babel config file to inherit config from " +
"please use the `extends` option.\nFor more information about this options see " +
"https://babeljs.io/docs/#options",
),
);
}
logger.debug("normalizing loader options");
// Standardize on 'sourceMaps' as the key passed through to Webpack, so that
// users may safely use either one alongside our default use of
// 'this.sourceMap' below without getting error about conflicting aliases.
if (
Object.prototype.hasOwnProperty.call(loaderOptions, "sourceMap") &&
!Object.prototype.hasOwnProperty.call(loaderOptions, "sourceMaps")
) {
loaderOptions = Object.assign({}, loaderOptions, {
sourceMaps: loaderOptions.sourceMap,
});
delete loaderOptions.sourceMap;
}
const programmaticOptions = Object.assign({}, loaderOptions, {
filename,
inputSourceMap: inputSourceMap || loaderOptions.inputSourceMap,
// Set the default sourcemap behavior based on Webpack's mapping flag,
// but allow users to override if they want.
sourceMaps:
loaderOptions.sourceMaps === undefined
? this.sourceMap
: loaderOptions.sourceMaps,
// Ensure that Webpack will get a full absolute path in the sourcemap
// so that it can properly map the module back to its internal cached
// modules.
sourceFileName: filename,
});
// Remove loader related options
delete programmaticOptions.customize;
delete programmaticOptions.cacheDirectory;
delete programmaticOptions.cacheIdentifier;
delete programmaticOptions.cacheCompression;
delete programmaticOptions.metadataSubscribers;
logger.debug("resolving Babel configs");
const config = await babel.loadPartialConfigAsync(
injectCaller(programmaticOptions, this.target),
);
if (config) {
let options = config.options;
if (overrides && overrides.config) {
logger.debug("applying overrides config() to Babel config");
options = await overrides.config.call(this, config, {
source,
map: inputSourceMap,
customOptions,
});
}
if (options.sourceMaps === "inline") {
// Babel has this weird behavior where if you set "inline", we
// inline the sourcemap, and set 'result.map = null'. This results
// in bad behavior from Babel since the maps get put into the code,
// which Webpack does not expect, and because the map we return to
// Webpack is null, which is also bad. To avoid that, we override the
// behavior here so "inline" just behaves like 'true'.
options.sourceMaps = true;
}
const {
cacheDirectory = null,
cacheIdentifier = "core" + transform.version + "," + "loader" + version,
cacheCompression = true,
metadataSubscribers = [],
} = loaderOptions;
let result;
if (cacheDirectory) {
logger.debug("cache is enabled");
const getFileTimestamp = promisify((path, cb) => {
this._compilation.fileSystemInfo.getFileTimestamp(path, cb);
});
const hash = this.utils.createHash(
this._compilation.outputOptions.hashFunction,
);
result = await cache({
source,
options,
transform,
cacheDirectory,
cacheIdentifier,
cacheCompression,
hash,
getFileTimestamp,
logger,
});
} else {
logger.debug("cache is disabled, applying Babel transform");
result = await transform(source, options);
}
config.files.forEach(configFile => {
this.addDependency(configFile);
logger.debug(`added '${configFile}' to webpack dependencies`);
});
if (result) {
if (overrides && overrides.result) {
logger.debug("applying overrides result() to Babel transform results");
result = await overrides.result.call(this, result, {
source,
map: inputSourceMap,
customOptions,
config,
options,
});
}
const { code, map, metadata, externalDependencies } = result;
externalDependencies?.forEach(([dep]) => {
this.addDependency(dep);
logger.debug(`added '${dep}' to webpack dependencies`);
});
metadataSubscribers.forEach(subscriber => {
subscribe(subscriber, metadata, this);
logger.debug(`invoked metadata subscriber '${String(subscriber)}'`);
});
return [code, map];
}
}
// If the file was ignored, pass through the original content.
return [source, inputSourceMap];
}