Method blockPromise

lib/RuntimeTemplate.js:1451–1508

* Returns expression. * @param {object} options options * @param {AsyncDependenciesBlock | undefined} options.block the async block * @param {string} options.message the message * @param {ChunkGraph} options.chunkGraph the chunk graph * @param {RuntimeRequirements} options.runtimeRequireme

({ block, message, chunkGraph, runtimeRequirements })

	 * @returns {string} expression
	 */
	blockPromise({ block, message, chunkGraph, runtimeRequirements }) {
		if (!block) {
			const comment = this.comment({
				message
			});
			return `Promise.resolve(${comment.trim()})`;
		}
		const chunkGroup = chunkGraph.getBlockChunkGroup(block);
		if (!chunkGroup || chunkGroup.chunks.length === 0) {
			const comment = this.comment({
				message
			});
			return `Promise.resolve(${comment.trim()})`;
		}
		const chunks = chunkGroup.chunks.filter(
			(chunk) => !chunk.hasRuntime() && chunk.id !== null
		);
		const comment = this.comment({
			message,
			chunkName: block.chunkName
		});
		if (chunks.length === 1) {
			const chunkId = JSON.stringify(chunks[0].id);
			runtimeRequirements.add(RuntimeGlobals.ensureChunk);

			const fetchPriority = chunkGroup.options.fetchPriority;

			if (fetchPriority) {
				runtimeRequirements.add(RuntimeGlobals.hasFetchPriority);
			}

			return `${RuntimeGlobals.ensureChunk}(${comment}${chunkId}${
				fetchPriority ? `, ${JSON.stringify(fetchPriority)}` : ""
			})`;
		} else if (chunks.length > 0) {
			runtimeRequirements.add(RuntimeGlobals.ensureChunk);

			const fetchPriority = chunkGroup.options.fetchPriority;

			if (fetchPriority) {
				runtimeRequirements.add(RuntimeGlobals.hasFetchPriority);
			}

			/**
			 * Returns require chunk id code.
			 * @param {Chunk} chunk chunk
			 * @returns {string} require chunk id code
			 */
			const requireChunkId = (chunk) =>
				`${RuntimeGlobals.ensureChunk}(${JSON.stringify(chunk.id)}${
					fetchPriority ? `, ${JSON.stringify(fetchPriority)}` : ""
				})`;
			return `Promise.all(${comment.trim()}[${chunks
				.map(requireChunkId)
				.join(", ")}])`;
		}
		return `Promise.resolve(${comment.trim()})`;
	}