@angular-devkit/build-optimizer
Version:
Angular Build Optimizer
104 lines (103 loc) • 4.55 kB
JavaScript
;
/**
* @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 = (0, 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 ((0, 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 ((0, scrub_file_1.testScrubFile)(content)) {
// Always test as these require the type checker
getTransforms.push((0, 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 (0, transform_javascript_1.transformJavascript)(transformJavascriptOpts);
}
exports.buildOptimizer = buildOptimizer;