@ngtools/webpack/src/resource_loader.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
 */
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Object.defineProperty(exports, "__esModule", { value: true });
exports.WebpackResourceLoader = void 0;
const path = __importStar(require("path"));
const vm = __importStar(require("vm"));
const paths_1 = require("./ivy/paths");
const inline_resource_1 = require("./loaders/inline-resource");
const replace_resources_1 = require("./transformers/replace_resources");
class WebpackResourceLoader {
    constructor(shouldCache) {
        this._fileDependencies = new Map();
        this._reverseDependencies = new Map();
        this.modifiedResources = new Set();
        this.outputPathCounter = 1;
        this.inlineDataLoaderPath = inline_resource_1.InlineAngularResourceLoaderPath;
        if (shouldCache) {
            this.fileCache = new Map();
            this.assetCache = new Map();
        }
    }
    update(parentCompilation, changedFiles) {
        var _a, _b, _c, _d, _e;
        this._parentCompilation = parentCompilation;
        // Update resource cache and modified resources
        this.modifiedResources.clear();
        if (changedFiles) {
            for (const changedFile of changedFiles) {
                const changedFileNormalized = (0, paths_1.normalizePath)(changedFile);
                (_a = this.assetCache) === null || _a === void 0 ? void 0 : _a.delete(changedFileNormalized);
                for (const affectedResource of this.getAffectedResources(changedFile)) {
                    const affectedResourceNormalized = (0, paths_1.normalizePath)(affectedResource);
                    (_b = this.fileCache) === null || _b === void 0 ? void 0 : _b.delete(affectedResourceNormalized);
                    this.modifiedResources.add(affectedResource);
                    for (const effectedDependencies of this.getResourceDependencies(affectedResourceNormalized)) {
                        (_c = this.assetCache) === null || _c === void 0 ? void 0 : _c.delete((0, paths_1.normalizePath)(effectedDependencies));
                    }
                }
            }
        }
        else {
            (_d = this.fileCache) === null || _d === void 0 ? void 0 : _d.clear();
            (_e = this.assetCache) === null || _e === void 0 ? void 0 : _e.clear();
        }
        // Re-emit all assets for un-effected files
        if (this.assetCache) {
            for (const [, { name, source, info }] of this.assetCache) {
                this._parentCompilation.emitAsset(name, source, info);
            }
        }
    }
    clearParentCompilation() {
        this._parentCompilation = undefined;
    }
    getModifiedResourceFiles() {
        return this.modifiedResources;
    }
    getResourceDependencies(filePath) {
        return this._fileDependencies.get(filePath) || [];
    }
    getAffectedResources(file) {
        return this._reverseDependencies.get(file) || [];
    }
    setAffectedResources(file, resources) {
        this._reverseDependencies.set(file, new Set(resources));
    }
    // eslint-disable-next-line max-lines-per-function
    async _compile(filePath, data, fileExtension, resourceType, containingFile) {
        if (!this._parentCompilation) {
            throw new Error('WebpackResourceLoader cannot be used without parentCompilation');
        }
        const { context, webpack } = this._parentCompilation.compiler;
        const { EntryPlugin, NormalModule, library, node, sources, util: { createHash }, } = webpack;
        const getEntry = () => {
            if (filePath) {
                return `${filePath}?${replace_resources_1.NG_COMPONENT_RESOURCE_QUERY}`;
            }
            else if (resourceType) {
                return (
                // app.component.ts-2.css?ngResource!=!@ngtools/webpack/src/loaders/inline-resource.js!app.component.ts
                `${containingFile}-${this.outputPathCounter}.${fileExtension}` +
                    `?${replace_resources_1.NG_COMPONENT_RESOURCE_QUERY}!=!${this.inlineDataLoaderPath}!${containingFile}`);
            }
            else if (data) {
                // Create a special URL for reading the resource from memory
                return `angular-resource:${resourceType},${createHash('xxhash64')
                    .update(data)
                    .digest('hex')}`;
            }
            throw new Error(`"filePath", "resourceType" or "data" must be specified.`);
        };
        const entry = getEntry();
        // Simple sanity check.
        if (filePath === null || filePath === void 0 ? void 0 : filePath.match(/\.[jt]s$/)) {
            throw new Error(`Cannot use a JavaScript or TypeScript file (${filePath}) in a component's styleUrls or templateUrl.`);
        }
        const outputFilePath = filePath ||
            `${containingFile}-angular-inline--${this.outputPathCounter++}.${resourceType === 'template' ? 'html' : 'css'}`;
        const outputOptions = {
            filename: outputFilePath,
            library: {
                type: 'var',
                name: 'resource',
            },
        };
        const childCompiler = this._parentCompilation.createChildCompiler('angular-compiler:resource', outputOptions, [
            new node.NodeTemplatePlugin(outputOptions),
            new node.NodeTargetPlugin(),
            new EntryPlugin(context, entry, { name: 'resource' }),
            new library.EnableLibraryPlugin('var'),
        ]);
        childCompiler.hooks.thisCompilation.tap('angular-compiler', (compilation, { normalModuleFactory }) => {
            // If no data is provided, the resource will be read from the filesystem
            if (data !== undefined) {
                normalModuleFactory.hooks.resolveForScheme
                    .for('angular-resource')
                    .tap('angular-compiler', (resourceData) => {
                    if (filePath) {
                        resourceData.path = filePath;
                        resourceData.resource = filePath;
                    }
                    return true;
                });
                NormalModule.getCompilationHooks(compilation)
                    .readResourceForScheme.for('angular-resource')
                    .tap('angular-compiler', () => data);
                compilation[inline_resource_1.InlineAngularResourceSymbol] = data;
            }
            compilation.hooks.additionalAssets.tap('angular-compiler', () => {
                const asset = compilation.assets[outputFilePath];
                if (!asset) {
                    return;
                }
                try {
                    const output = this._evaluate(outputFilePath, asset.source().toString());
                    if (typeof output === 'string') {
                        compilation.assets[outputFilePath] = new sources.RawSource(output);
                    }
                }
                catch (error) {
                    // Use compilation errors, as otherwise webpack will choke
                    compilation.errors.push(error);
                }
            });
        });
        let finalContent;
        childCompiler.hooks.compilation.tap('angular-compiler', (childCompilation) => {
            childCompilation.hooks.processAssets.tap({ name: 'angular-compiler', stage: webpack.Compilation.PROCESS_ASSETS_STAGE_REPORT }, () => {
                var _a;
                finalContent = (_a = childCompilation.assets[outputFilePath]) === null || _a === void 0 ? void 0 : _a.source().toString();
                for (const { files } of childCompilation.chunks) {
                    for (const file of files) {
                        childCompilation.deleteAsset(file);
                    }
                }
            });
        });
        return new Promise((resolve, reject) => {
            childCompiler.runAsChild((error, _, childCompilation) => {
                var _a, _b;
                if (error) {
                    reject(error);
                    return;
                }
                else if (!childCompilation) {
                    reject(new Error('Unknown child compilation error'));
                    return;
                }
                // Workaround to attempt to reduce memory usage of child compilations.
                // This removes the child compilation from the main compilation and manually propagates
                // all dependencies, warnings, and errors.
                const parent = childCompiler.parentCompilation;
                if (parent) {
                    parent.children = parent.children.filter((child) => child !== childCompilation);
                    let fileDependencies;
                    for (const dependency of childCompilation.fileDependencies) {
                        // Skip paths that do not appear to be files (have no extension).
                        // `fileDependencies` can contain directories and not just files which can
                        // cause incorrect cache invalidation on rebuilds.
                        if (!path.extname(dependency)) {
                            continue;
                        }
                        if (data && containingFile && dependency.endsWith(entry)) {
                            // use containing file if the resource was inline
                            parent.fileDependencies.add(containingFile);
                        }
                        else {
                            parent.fileDependencies.add(dependency);
                        }
                        // Save the dependencies for this resource.
                        if (filePath) {
                            const resolvedFile = (0, paths_1.normalizePath)(dependency);
                            const entry = this._reverseDependencies.get(resolvedFile);
                            if (entry) {
                                entry.add(filePath);
                            }
                            else {
                                this._reverseDependencies.set(resolvedFile, new Set([filePath]));
                            }
                            if (fileDependencies) {
                                fileDependencies.add(dependency);
                            }
                            else {
                                fileDependencies = new Set([dependency]);
                                this._fileDependencies.set(filePath, fileDependencies);
                            }
                        }
                    }
                    parent.contextDependencies.addAll(childCompilation.contextDependencies);
                    parent.missingDependencies.addAll(childCompilation.missingDependencies);
                    parent.buildDependencies.addAll(childCompilation.buildDependencies);
                    parent.warnings.push(...childCompilation.warnings);
                    parent.errors.push(...childCompilation.errors);
                    if (this.assetCache) {
                        for (const { info, name, source } of childCompilation.getAssets()) {
                            // Use the originating file as the cache key if present
                            // Otherwise, generate a cache key based on the generated name
                            const cacheKey = (_a = info.sourceFilename) !== null && _a !== void 0 ? _a : `!![GENERATED]:${name}`;
                            this.assetCache.set(cacheKey, { info, name, source });
                        }
                    }
                }
                resolve({
                    content: finalContent !== null && finalContent !== void 0 ? finalContent : '',
                    success: ((_b = childCompilation.errors) === null || _b === void 0 ? void 0 : _b.length) === 0,
                });
            });
        });
    }
    _evaluate(filename, source) {
        var _a;
        // Evaluate code
        const context = {};
        try {
            vm.runInNewContext(source, context, { filename });
        }
        catch {
            // Error are propagated through the child compilation.
            return null;
        }
        if (typeof context.resource === 'string') {
            return context.resource;
        }
        else if (typeof ((_a = context.resource) === null || _a === void 0 ? void 0 : _a.default) === 'string') {
            return context.resource.default;
        }
        throw new Error(`The loader "${filename}" didn't return a string.`);
    }
    async get(filePath) {
        var _a;
        const normalizedFile = (0, paths_1.normalizePath)(filePath);
        let compilationResult = (_a = this.fileCache) === null || _a === void 0 ? void 0 : _a.get(normalizedFile);
        if (compilationResult === undefined) {
            // cache miss so compile resource
            compilationResult = await this._compile(filePath);
            // Only cache if compilation was successful
            if (this.fileCache && compilationResult.success) {
                this.fileCache.set(normalizedFile, compilationResult);
            }
        }
        return compilationResult.content;
    }
    async process(data, fileExtension, resourceType, containingFile) {
        if (data.trim().length === 0) {
            return '';
        }
        const compilationResult = await this._compile(undefined, data, fileExtension, resourceType, containingFile);
        return compilationResult.content;
    }
}
exports.WebpackResourceLoader = WebpackResourceLoader;