Method generate

lib/css/CssLoadingRuntimeModule.js:46–572

* Generates runtime code for this runtime module. * @returns {string | null} runtime code

()

	 * @returns {string | null} runtime code
	 */
	generate() {
		const { _runtimeRequirements } = this;
		const compilation = /** @type {Compilation} */ (this.compilation);
		const chunk = /** @type {Chunk} */ (this.chunk);
		const {
			chunkGraph,
			runtimeTemplate,
			outputOptions: {
				crossOriginLoading,
				uniqueName,
				chunkLoadTimeout: loadTimeout,
				charset,
				importMetaName
			}
		} = compilation;
		const fn = RuntimeGlobals.ensureChunkHandlers;
		const conditionMap = chunkGraph.getChunkConditionMap(
			chunk,
			/**
			 * @param {Chunk} chunk the chunk
			 * @param {ChunkGraph} chunkGraph the chunk graph
			 * @returns {boolean} true, if the chunk has css
			 */
			(chunk, chunkGraph) =>
				Boolean(chunkGraph.getChunkModulesIterableBySourceType(chunk, CSS_TYPE))
		);
		const hasCssMatcher = compileBooleanMatcher(conditionMap);

		const withLoading =
			_runtimeRequirements.has(RuntimeGlobals.ensureChunkHandlers) &&
			hasCssMatcher !== false;
		/** @type {boolean} */
		const withHmr = _runtimeRequirements.has(
			RuntimeGlobals.hmrDownloadUpdateHandlers
		);
		/** @type {Set<ChunkId>} */
		const initialChunkIds = new Set();
		for (const c of chunk.getAllInitialChunks()) {
			if (chunkHasCss(c, chunkGraph)) {
				initialChunkIds.add(/** @type {ChunkId} */ (c.id));
			}
		}

		if (!withLoading && !withHmr) {
			return null;
		}

		const environment = compilation.outputOptions.environment;
		const isNeutralPlatform = runtimeTemplate.isNeutralPlatform();
		const withPrefetch =
			this._runtimeRequirements.has(RuntimeGlobals.prefetchChunkHandlers) &&
			(environment.document || isNeutralPlatform) &&
			chunk.hasChildByOrder(chunkGraph, "prefetch", true, chunkHasCss);
		const withPreload =
			this._runtimeRequirements.has(RuntimeGlobals.preloadChunkHandlers) &&
			(environment.document || isNeutralPlatform) &&
			chunk.hasChildByOrder(chunkGraph, "preload", true, chunkHasCss);