Alex Hochheiden
d0470670a1
`third_party/node/node_modules` is generated by `./mach vendor node`. Differential Revision: https://phabricator.services.mozilla.com/D320322
59 lines
2.1 KiB
JavaScript
59 lines
2.1 KiB
JavaScript
/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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*/
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"use strict";
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const RuntimeGlobals = require("../RuntimeGlobals");
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const RuntimeModule = require("../RuntimeModule");
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const Template = require("../Template");
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/** @typedef {import("../Compilation")} Compilation */
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/** @typedef {import("../Chunk").ChunkChildIdsByOrdersMap} ChunkChildIdsByOrdersMap */
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class ChunkPreloadTriggerRuntimeModule extends RuntimeModule {
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/**
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* @param {ChunkChildIdsByOrdersMap} chunkMap map from chunk to chunks
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* @param {string=} handlerKey the `ensureChunkHandlers` key to install under (default `"preload"`); `"cssPreload"` preloads only the CSS handler so it stays CSS-only even when the build also registers a JS preload handler
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*/
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constructor(chunkMap, handlerKey = "preload") {
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super(`chunk ${handlerKey} trigger`, RuntimeModule.STAGE_TRIGGER);
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/** @type {ChunkChildIdsByOrdersMap} */
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this.chunkMap = chunkMap;
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/** @type {string} */
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this.handlerKey = handlerKey;
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}
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/**
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* Generates runtime code for this runtime module.
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* @returns {string | null} runtime code
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*/
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generate() {
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const { chunkMap, handlerKey } = this;
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const compilation = /** @type {Compilation} */ (this.compilation);
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const { runtimeTemplate } = compilation;
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// `cssPreload` calls only the CSS preload handler (`preloadChunkHandlers.s`)
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// so it stays CSS-only regardless of a JS preload handler registered
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// elsewhere; plain `preload` fans out to every handler via `preloadChunk`.
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const body =
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handlerKey === "cssPreload"
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? [
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`var handler = ${RuntimeGlobals.preloadChunkHandlers}.s;`,
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"var chunks = chunkToChildrenMap[chunkId];",
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"if (handler && Array.isArray(chunks)) chunks.forEach(handler);"
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]
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: [
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"var chunks = chunkToChildrenMap[chunkId];",
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`Array.isArray(chunks) && chunks.map(${RuntimeGlobals.preloadChunk});`
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];
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return Template.asString([
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`var chunkToChildrenMap = ${JSON.stringify(chunkMap, null, "\t")};`,
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`${
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RuntimeGlobals.ensureChunkHandlers
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}.${handlerKey} = ${runtimeTemplate.basicFunction("chunkId", body)};`
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]);
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}
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}
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module.exports = ChunkPreloadTriggerRuntimeModule;
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