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ProvideSharedPlugin.js
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Thu, Feb 13, 13:56

ProvideSharedPlugin.js
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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra and Zackary Jackson @ScriptedAlchemy
*/
"use strict";
const { validate } = require("schema-utils");
const schema = require("../../schemas/plugins/sharing/ProvideSharedPlugin.json");
const WebpackError = require("../WebpackError");
const { parseOptions } = require("../container/options");
const ProvideForSharedDependency = require("./ProvideForSharedDependency");
const ProvideSharedDependency = require("./ProvideSharedDependency");
const ProvideSharedModuleFactory = require("./ProvideSharedModuleFactory");
/** @typedef {import("../../declarations/plugins/sharing/ProvideSharedPlugin").ProvideSharedPluginOptions} ProvideSharedPluginOptions */
/** @typedef {import("../Compilation")} Compilation */
/** @typedef {import("../Compiler")} Compiler */
/**
* @typedef {Object} ProvideOptions
* @property {string} shareKey
* @property {string} shareScope
* @property {string | undefined | false} version
* @property {boolean} eager
*/
/** @typedef {Map<string, { config: ProvideOptions, version: string | undefined | false }>} ResolvedProvideMap */
class ProvideSharedPlugin {
/**
* @param {ProvideSharedPluginOptions} options options
*/
constructor(options) {
validate(schema, options, { name: "Provide Shared Plugin" });
/** @type {[string, ProvideOptions][]} */
this._provides = parseOptions(
options.provides,
item => {
if (Array.isArray(item))
throw new Error("Unexpected array of provides");
/** @type {ProvideOptions} */
const result = {
shareKey: item,
version: undefined,
shareScope: options.shareScope || "default",
eager: false
};
return result;
},
item => ({
shareKey: item.shareKey,
version: item.version,
shareScope: item.shareScope || options.shareScope || "default",
eager: !!item.eager
})
);
this._provides.sort(([a], [b]) => {
if (a < b) return -1;
if (b < a) return 1;
return 0;
});
}
/**
* Apply the plugin
* @param {Compiler} compiler the compiler instance
* @returns {void}
*/
apply(compiler) {
/** @type {WeakMap<Compilation, ResolvedProvideMap>} */
const compilationData = new WeakMap();
compiler.hooks.compilation.tap(
"ProvideSharedPlugin",
(compilation, { normalModuleFactory }) => {
/** @type {ResolvedProvideMap} */
const resolvedProvideMap = new Map();
/** @type {Map<string, ProvideOptions>} */
const matchProvides = new Map();
/** @type {Map<string, ProvideOptions>} */
const prefixMatchProvides = new Map();
for (const [request, config] of this._provides) {
if (/^(\/|[A-Za-z]:\\|\\\\|\.\.?(\/|$))/.test(request)) {
// relative request
resolvedProvideMap.set(request, {
config,
version: config.version
});
} else if (/^(\/|[A-Za-z]:\\|\\\\)/.test(request)) {
// absolute path
resolvedProvideMap.set(request, {
config,
version: config.version
});
} else if (request.endsWith("/")) {
// module request prefix
prefixMatchProvides.set(request, config);
} else {
// module request
matchProvides.set(request, config);
}
}
compilationData.set(compilation, resolvedProvideMap);
const provideSharedModule = (
key,
config,
resource,
resourceResolveData
) => {
let version = config.version;
if (version === undefined) {
let details = "";
if (!resourceResolveData) {
details = `No resolve data provided from resolver.`;
} else {
const descriptionFileData =
resourceResolveData.descriptionFileData;
if (!descriptionFileData) {
details =
"No description file (usually package.json) found. Add description file with name and version, or manually specify version in shared config.";
} else if (!descriptionFileData.version) {
details =
"No version in description file (usually package.json). Add version to description file, or manually specify version in shared config.";
} else {
version = descriptionFileData.version;
}
}
if (!version) {
const error = new WebpackError(
`No version specified and unable to automatically determine one. ${details}`
);
error.file = `shared module ${key} -> ${resource}`;
compilation.warnings.push(error);
}
}
resolvedProvideMap.set(resource, {
config,
version
});
};
normalModuleFactory.hooks.module.tap(
"ProvideSharedPlugin",
(module, { resource, resourceResolveData }, resolveData) => {
if (resolvedProvideMap.has(resource)) {
return module;
}
const { request } = resolveData;
{
const config = matchProvides.get(request);
if (config !== undefined) {
provideSharedModule(
request,
config,
resource,
resourceResolveData
);
resolveData.cacheable = false;
}
}
for (const [prefix, config] of prefixMatchProvides) {
if (request.startsWith(prefix)) {
const remainder = request.slice(prefix.length);
provideSharedModule(
resource,
{
...config,
shareKey: config.shareKey + remainder
},
resource,
resourceResolveData
);
resolveData.cacheable = false;
}
}
return module;
}
);
}
);
compiler.hooks.finishMake.tapPromise("ProvideSharedPlugin", compilation => {
const resolvedProvideMap = compilationData.get(compilation);
if (!resolvedProvideMap) return Promise.resolve();
return Promise.all(
Array.from(
resolvedProvideMap,
([resource, { config, version }]) =>
new Promise((resolve, reject) => {
compilation.addInclude(
compiler.context,
new ProvideSharedDependency(
config.shareScope,
config.shareKey,
version || false,
resource,
config.eager
),
{
name: undefined
},
err => {
if (err) return reject(err);
resolve();
}
);
})
)
).then(() => {});
});
compiler.hooks.compilation.tap(
"ProvideSharedPlugin",
(compilation, { normalModuleFactory }) => {
compilation.dependencyFactories.set(
ProvideForSharedDependency,
normalModuleFactory
);
compilation.dependencyFactories.set(
ProvideSharedDependency,
new ProvideSharedModuleFactory()
);
}
);
}
}
module.exports = ProvideSharedPlugin;

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