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webpack-loader.ts
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webpack-loader.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 { needsLinking } from '@angular/compiler-cli/linker';
import { custom } from 'babel-loader';
import { ScriptTarget } from 'typescript';
import { ApplicationPresetOptions } from './presets/application';
interface AngularCustomOptions {
forceAsyncTransformation: boolean;
forceES5: boolean;
shouldLink: boolean;
i18n: ApplicationPresetOptions['i18n'];
}
function requiresLinking(
path: string,
source: string,
): boolean {
// @angular/core and @angular/compiler will cause false positives
// Also, TypeScript files do not require linking
if (/[\\\/]@angular[\\\/](?:compiler|core)|\.tsx?$/.test(path)) {
return false;
}
return needsLinking(path, source);
}
export default custom<AngularCustomOptions>(() => {
const baseOptions = Object.freeze({
babelrc: false,
configFile: false,
compact: false,
cacheCompression: false,
sourceType: 'unambiguous',
inputSourceMap: false,
});
return {
async customOptions({ i18n, scriptTarget, ...rawOptions }, { source }) {
// Must process file if plugins are added
let shouldProcess = Array.isArray(rawOptions.plugins) && rawOptions.plugins.length > 0;
const customOptions: AngularCustomOptions = {
forceAsyncTransformation: false,
forceES5: false,
shouldLink: false,
i18n: undefined,
};
// Analyze file for linking
customOptions.shouldLink = await requiresLinking(this.resourcePath, source);
shouldProcess ||= customOptions.shouldLink;
// Analyze for ES target processing
const esTarget = scriptTarget as ScriptTarget | undefined;
if (esTarget !== undefined) {
if (esTarget < ScriptTarget.ES2015) {
// TypeScript files will have already been downlevelled
customOptions.forceES5 = !/\.tsx?$/.test(this.resourcePath);
} else if (esTarget >= ScriptTarget.ES2017) {
customOptions.forceAsyncTransformation = !/[\\\/]fesm2015[\\\/]/.test(this.resourcePath) && source.includes('async');
}
shouldProcess ||= customOptions.forceAsyncTransformation || customOptions.forceES5;
}
// Analyze for i18n inlining
if (
i18n &&
!/[\\\/]@angular[\\\/](?:compiler|localize)/.test(this.resourcePath) &&
source.includes('$localize')
) {
customOptions.i18n = i18n as ApplicationPresetOptions['i18n'];
shouldProcess = true;
}
// Add provided loader options to default base options
const loaderOptions: Record<string, unknown> = {
...baseOptions,
...rawOptions,
cacheIdentifier: JSON.stringify({
buildAngular: require('../../package.json').version,
customOptions,
baseOptions,
rawOptions,
}),
};
// Skip babel processing if no actions are needed
if (!shouldProcess) {
// Force the current file to be ignored
loaderOptions.ignore = [() => true];
}
return { custom: customOptions, loader: loaderOptions };
},
config(configuration, { customOptions }) {
return {
...configuration.options,
presets: [
...(configuration.options.presets || []),
[
require('./presets/application').default,
{
angularLinker: customOptions.shouldLink,
forceES5: customOptions.forceES5,
forceAsyncTransformation: customOptions.forceAsyncTransformation,
i18n: customOptions.i18n,
diagnosticReporter: (type, message) => {
switch (type) {
case 'error':
this.emitError(message);
break;
case 'info':
// Webpack does not currently have an informational diagnostic
case 'warning':
this.emitWarning(message);
break;
}
},
} as ApplicationPresetOptions,
],
],
};
},
};
});