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73 lines
2.2 KiB
Text
73 lines
2.2 KiB
Text
/*
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Copyright 2019 Google LLC
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Use of this source code is governed by an MIT-style
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license that can be found in the LICENSE file or at
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https://opensource.org/licenses/MIT.
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*/
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import {oneLine as ol} from 'common-tags';
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import upath from 'upath';
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/**
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* Class for keeping track of which Workbox modules are used by the generated
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* service worker script.
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*
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* @private
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*/
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export class ModuleRegistry {
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private readonly _modulesUsed: Map<string, {moduleName: string; pkg: string}>;
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/**
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* @private
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*/
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constructor() {
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this._modulesUsed = new Map();
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}
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/**
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* @return {Array<string>} A list of all of the import statements that are
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* needed for the modules being used.
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* @private
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*/
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getImportStatements(): Array<string> {
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const workboxModuleImports: Array<string> = [];
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for (const [localName, {moduleName, pkg}] of this._modulesUsed) {
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// By default require.resolve returns the resolved path of the 'main'
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// field, which might be deeper than the package root. To work around
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// this, we can find the package's root by resolving its package.json and
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// strip the '/package.json' from the resolved path.
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const pkgJsonPath = require.resolve(`${pkg}/package.json`);
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const pkgRoot = upath.dirname(pkgJsonPath);
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const importStatement = ol`import {${moduleName} as ${localName}} from
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'${pkgRoot}/${moduleName}.mjs';`;
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workboxModuleImports.push(importStatement);
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}
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return workboxModuleImports;
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}
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/**
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* @param {string} pkg The workbox package that the module belongs to.
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* @param {string} moduleName The name of the module to import.
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* @return {string} The local variable name that corresponds to that module.
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* @private
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*/
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getLocalName(pkg: string, moduleName: string): string {
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return `${pkg.replace(/-/g, '_')}_${moduleName}`;
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}
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/**
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* @param {string} pkg The workbox package that the module belongs to.
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* @param {string} moduleName The name of the module to import.
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* @return {string} The local variable name that corresponds to that module.
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* @private
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*/
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use(pkg: string, moduleName: string): string {
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const localName = this.getLocalName(pkg, moduleName);
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this._modulesUsed.set(localName, {moduleName, pkg});
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return localName;
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}
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}
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