@angular-devkit/build-optimizer/src/build-optimizer/build-optimizer.js

"use strict";
/**
 * @license
 * Copyright Google LLC 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
 */
Object.defineProperty(exports, "__esModule", { value: true });
exports.buildOptimizer = void 0;
const fs_1 = require("fs");
const transform_javascript_1 = require("../helpers/transform-javascript");
const prefix_classes_1 = require("../transforms/prefix-classes");
const prefix_functions_1 = require("../transforms/prefix-functions");
const scrub_file_1 = require("../transforms/scrub-file");
const wrap_enums_1 = require("../transforms/wrap-enums");
// Angular packages are known to have no side effects.
const knownSideEffectFreeAngularModules = [
    /[\\/]node_modules[\\/]@angular[\\/]animations[\\/]/,
    /[\\/]node_modules[\\/]@angular[\\/]common[\\/]/,
    /[\\/]node_modules[\\/]@angular[\\/]compiler[\\/]/,
    /[\\/]node_modules[\\/]@angular[\\/]core[\\/]/,
    /[\\/]node_modules[\\/]@angular[\\/]forms[\\/]/,
    /[\\/]node_modules[\\/]@angular[\\/]http[\\/]/,
    /[\\/]node_modules[\\/]@angular[\\/]platform-browser-dynamic[\\/]/,
    /[\\/]node_modules[\\/]@angular[\\/]platform-browser[\\/]/,
    /[\\/]node_modules[\\/]@angular[\\/]platform-webworker-dynamic[\\/]/,
    /[\\/]node_modules[\\/]@angular[\\/]platform-webworker[\\/]/,
    /[\\/]node_modules[\\/]@angular[\\/]router[\\/]/,
    /[\\/]node_modules[\\/]@angular[\\/]upgrade[\\/]/,
    /[\\/]node_modules[\\/]@angular[\\/]material[\\/]/,
    /[\\/]node_modules[\\/]@angular[\\/]cdk[\\/]/,
    /[\\/]node_modules[\\/]rxjs[\\/]/,
];
// Known locations for the source files of @angular/core.
const coreFilesRegex = /[\\/]node_modules[\\/]@angular[\\/]core[\\/][f]?esm2015[\\/]/;
function isKnownCoreFile(filePath) {
    return coreFilesRegex.test(filePath);
}
function isKnownSideEffectFree(filePath) {
    // rxjs add imports contain intentional side effects
    if (/[\\/]node_modules[\\/]rxjs[\\/]add[\\/]/.test(filePath)) {
        return false;
    }
    return knownSideEffectFreeAngularModules.some((re) => re.test(filePath));
}
function buildOptimizer(options) {
    const { inputFilePath } = options;
    let { originalFilePath, content, isAngularCoreFile } = options;
    if (!originalFilePath && inputFilePath) {
        originalFilePath = inputFilePath;
    }
    if (!inputFilePath && content === undefined) {
        throw new Error('Either filePath or content must be specified in options.');
    }
    if (content === undefined) {
        content = fs_1.readFileSync(inputFilePath, 'UTF-8');
    }
    if (!content) {
        return {
            content: null,
            sourceMap: null,
            emitSkipped: true,
        };
    }
    if (isAngularCoreFile === undefined) {
        isAngularCoreFile = !!originalFilePath && isKnownCoreFile(originalFilePath);
    }
    const hasSafeSideEffects = originalFilePath && isKnownSideEffectFree(originalFilePath);
    // Determine which transforms to apply.
    const getTransforms = [];
    let typeCheck = false;
    if (hasSafeSideEffects) {
        // Angular modules have known safe side effects
        getTransforms.push(
        // getPrefixFunctionsTransformer is rather dangerous, apply only to known pure es5 modules.
        // It will mark both `require()` calls and `console.log(stuff)` as pure.
        // We only apply it to modules known to be side effect free, since we know they are safe.
        prefix_functions_1.getPrefixFunctionsTransformer);
        typeCheck = true;
    }
    else if (prefix_classes_1.testPrefixClasses(content)) {
        // This is only relevant if prefix functions is not used since prefix functions will prefix IIFE wrapped classes.
        getTransforms.unshift(prefix_classes_1.getPrefixClassesTransformer);
    }
    if (scrub_file_1.testScrubFile(content)) {
        // Always test as these require the type checker
        getTransforms.push(scrub_file_1.createScrubFileTransformerFactory(isAngularCoreFile));
        typeCheck = true;
    }
    getTransforms.push(wrap_enums_1.getWrapEnumsTransformer);
    const transformJavascriptOpts = {
        content: content,
        inputFilePath: options.inputFilePath,
        outputFilePath: options.outputFilePath,
        emitSourceMap: options.emitSourceMap,
        strict: options.strict,
        getTransforms,
        typeCheck,
    };
    return transform_javascript_1.transformJavascript(transformJavascriptOpts);
}
exports.buildOptimizer = buildOptimizer;