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ChunkPrefetchTriggerRuntimeModule.js
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Wed, Feb 5, 19:01

ChunkPrefetchTriggerRuntimeModule.js
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/*
MIT License http://www.opensource.org/licenses/mit-license.php
*/
"use strict";
const RuntimeGlobals = require("../RuntimeGlobals");
const RuntimeModule = require("../RuntimeModule");
const Template = require("../Template");
/** @typedef {import("../RuntimeTemplate")} RuntimeTemplate */
class ChunkPrefetchTriggerRuntimeModule extends RuntimeModule {
/**
* @param {string} childType TODO
* @param {string} runtimeFunction TODO
* @param {Object} chunkMap map from chunk to
* @param {boolean} afterChunkLoad true: start after chunk has been loaded, false: start after chunk loading has started
*/
constructor(childType, runtimeFunction, chunkMap, afterChunkLoad) {
super(`chunk ${childType} trigger`, RuntimeModule.STAGE_TRIGGER);
this.childType = childType;
this.runtimeFunction = runtimeFunction;
this.chunkMap = chunkMap;
this.afterChunkLoad = afterChunkLoad;
}
/**
* @returns {string} runtime code
*/
generate() {
const { childType, runtimeFunction, chunkMap, afterChunkLoad } = this;
const { runtimeTemplate } = this.compilation;
const body = [
"var chunks = chunkToChildrenMap[chunkId];",
"for (var i = 0; Array.isArray(chunks) && i < chunks.length; i++) {",
Template.indent(`${runtimeFunction}(chunks[i]);`),
"}"
];
return Template.asString([
chunkMap
? Template.asString([
`var chunkToChildrenMap = ${JSON.stringify(chunkMap, null, "\t")};`,
`${RuntimeGlobals.ensureChunkHandlers}.${childType} = ${
afterChunkLoad
? runtimeTemplate.basicFunction("chunkId, promises", [
`Promise.all(promises).then(${runtimeTemplate.basicFunction(
"",
body
)});`
])
: runtimeTemplate.basicFunction("chunkId", body)
};`
])
: `// no chunks to automatically ${childType} specified in graph`
]);
}
}
module.exports = ChunkPrefetchTriggerRuntimeModule;

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