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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const util = require("util");
const ExternalModule = require("./ExternalModule");
const { resolveByProperty, cachedSetProperty } = require("./util/cleverMerge");
/** @typedef {import("../declarations/WebpackOptions").Externals} Externals */
/** @typedef {import("./NormalModuleFactory")} NormalModuleFactory */
const UNSPECIFIED_EXTERNAL_TYPE_REGEXP = /^[a-z0-9-]+ /;
const EMPTY_RESOLVE_OPTIONS = {};
// TODO webpack 6 remove this
const callDeprecatedExternals = util.deprecate(
(externalsFunction, context, request, cb) => {
externalsFunction.call(null, context, request, cb);
},
"The externals-function should be defined like ({context, request}, cb) => { ... }",
"DEP_WEBPACK_EXTERNALS_FUNCTION_PARAMETERS"
);
const cache = new WeakMap();
const resolveLayer = (obj, layer) => {
let map = cache.get(obj);
if (map === undefined) {
map = new Map();
cache.set(obj, map);
} else {
const cacheEntry = map.get(layer);
if (cacheEntry !== undefined) return cacheEntry;
}
const result = resolveByProperty(obj, "byLayer", layer);
map.set(layer, result);
return result;
};
class ExternalModuleFactoryPlugin {
/**
* @param {string | undefined} type default external type
* @param {Externals} externals externals config
*/
constructor(type, externals) {
this.type = type;
this.externals = externals;
}
/**
* @param {NormalModuleFactory} normalModuleFactory the normal module factory
* @returns {void}
*/
apply(normalModuleFactory) {
const globalType = this.type;
normalModuleFactory.hooks.factorize.tapAsync(
"ExternalModuleFactoryPlugin",
(data, callback) => {
const context = data.context;
const contextInfo = data.contextInfo;
const dependency = data.dependencies[0];
const dependencyType = data.dependencyType;
/**
* @param {string|string[]|boolean|Record<string, string|string[]>} value the external config
* @param {string|undefined} type type of external
* @param {function(Error=, ExternalModule=): void} callback callback
* @returns {void}
*/
const handleExternal = (value, type, callback) => {
if (value === false) {
// Not externals, fallback to original factory
return callback();
}
/** @type {string | string[] | Record<string, string|string[]>} */
let externalConfig;
if (value === true) {
externalConfig = dependency.request;
} else {
externalConfig = value;
}
// When no explicit type is specified, extract it from the externalConfig
if (type === undefined) {
if (
typeof externalConfig === "string" &&
UNSPECIFIED_EXTERNAL_TYPE_REGEXP.test(externalConfig)
) {
const idx = externalConfig.indexOf(" ");
type = externalConfig.substr(0, idx);
externalConfig = externalConfig.substr(idx + 1);
} else if (
Array.isArray(externalConfig) &&
externalConfig.length > 0 &&
UNSPECIFIED_EXTERNAL_TYPE_REGEXP.test(externalConfig[0])
) {
const firstItem = externalConfig[0];
const idx = firstItem.indexOf(" ");
type = firstItem.substr(0, idx);
externalConfig = [
firstItem.substr(idx + 1),
...externalConfig.slice(1)
];
}
}
callback(
null,
new ExternalModule(
externalConfig,
type || globalType,
dependency.request
)
);
};
/**
* @param {Externals} externals externals config
* @param {function(Error=, ExternalModule=): void} callback callback
* @returns {void}
*/
const handleExternals = (externals, callback) => {
if (typeof externals === "string") {
if (externals === dependency.request) {
return handleExternal(dependency.request, undefined, callback);
}
} else if (Array.isArray(externals)) {
let i = 0;
const next = () => {
let asyncFlag;
const handleExternalsAndCallback = (err, module) => {
if (err) return callback(err);
if (!module) {
if (asyncFlag) {
asyncFlag = false;
return;
}
return next();
}
callback(null, module);
};
do {
asyncFlag = true;
if (i >= externals.length) return callback();
handleExternals(externals[i++], handleExternalsAndCallback);
} while (!asyncFlag);
asyncFlag = false;
};
next();
return;
} else if (externals instanceof RegExp) {
if (externals.test(dependency.request)) {
return handleExternal(dependency.request, undefined, callback);
}
} else if (typeof externals === "function") {
const cb = (err, value, type) => {
if (err) return callback(err);
if (value !== undefined) {
handleExternal(value, type, callback);
} else {
callback();
}
};
if (externals.length === 3) {
// TODO webpack 6 remove this
callDeprecatedExternals(
externals,
context,
dependency.request,
cb
);
} else {
const promise = externals(
{
context,
request: dependency.request,
dependencyType,
contextInfo,
getResolve: options => (context, request, callback) => {
const resolveContext = {
fileDependencies: data.fileDependencies,
missingDependencies: data.missingDependencies,
contextDependencies: data.contextDependencies
};
let resolver = normalModuleFactory.getResolver(
"normal",
dependencyType
? cachedSetProperty(
data.resolveOptions || EMPTY_RESOLVE_OPTIONS,
"dependencyType",
dependencyType
)
: data.resolveOptions
);
if (options) resolver = resolver.withOptions(options);
if (callback) {
resolver.resolve(
{},
context,
request,
resolveContext,
callback
);
} else {
return new Promise((resolve, reject) => {
resolver.resolve(
{},
context,
request,
resolveContext,
(err, result) => {
if (err) reject(err);
else resolve(result);
}
);
});
}
}
},
cb
);
if (promise && promise.then) promise.then(r => cb(null, r), cb);
}
return;
} else if (typeof externals === "object") {
const resolvedExternals = resolveLayer(
externals,
contextInfo.issuerLayer
);
if (
Object.prototype.hasOwnProperty.call(
resolvedExternals,
dependency.request
)
) {
return handleExternal(
resolvedExternals[dependency.request],
undefined,
callback
);
}
}
callback();
};
handleExternals(this.externals, callback);
}
);
}
}
module.exports = ExternalModuleFactoryPlugin;