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dedupe-module-resolve-plugin.ts
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dedupe-module-resolve-plugin.ts
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/**
* @license
* Copyright Google Inc. All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import { Compiler } from 'webpack';
import { addWarning } from '../../utils/webpack-diagnostics';
interface AfterResolveResult {
request: string;
resource: string;
context: {
issuer: string;
};
resourceResolveData: {
relativePath: string;
descriptionFileRoot: string;
descriptionFilePath: string;
descriptionFileData: {
name?: string;
version?: string;
};
};
}
export interface DedupeModuleResolvePluginOptions {
verbose?: boolean;
}
/**
* DedupeModuleResolvePlugin is a webpack plugin which dedupes modules with the same name and versions
* that are laid out in different parts of the node_modules tree.
*
* This is needed because Webpack relies on package managers to hoist modules and doesn't have any deduping logic.
*
* This is similar to how Webpack's 'NormalModuleReplacementPlugin' works
* @see https://github.com/webpack/webpack/blob/4a1f068828c2ab47537d8be30d542cd3a1076db4/lib/NormalModuleReplacementPlugin.js#L9
*/
export class DedupeModuleResolvePlugin {
modules = new Map<string, { request: string, resource: string }>();
constructor(private options?: DedupeModuleResolvePluginOptions) { }
apply(compiler: Compiler) {
compiler.hooks.compilation.tap('DedupeModuleResolvePlugin', (compilation, { normalModuleFactory }) => {
normalModuleFactory.hooks.afterResolve.tap('DedupeModuleResolvePlugin', (result: AfterResolveResult | undefined) => {
if (!result) {
return;
}
const { resource, request, resourceResolveData } = result;
const { descriptionFileData, relativePath } = resourceResolveData;
// Empty name or versions are no valid primary entrypoints of a library
if (!descriptionFileData?.name || !descriptionFileData?.version) {
return;
}
const moduleId = descriptionFileData.name + '@' + descriptionFileData.version + ':' + relativePath;
const prevResolvedModule = this.modules.get(moduleId);
if (!prevResolvedModule) {
// This is the first time we visit this module.
this.modules.set(moduleId, {
resource,
request,
});
return;
}
const { resource: prevResource, request: prevRequest } = prevResolvedModule;
if (result.resource === prevResource) {
// No deduping needed.
// Current path and previously resolved path are the same.
return;
}
if (this.options?.verbose) {
addWarning(compilation, `[DedupeModuleResolvePlugin]: ${result.resource} -> ${prevResource}`);
}
// Alter current request with previously resolved module.
result.request = prevRequest;
});
});
}
}