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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("../Chunk")} Chunk */
/** @typedef {import("../Compilation")} Compilation */
/** @typedef {import("../RuntimeTemplate")} RuntimeTemplate */
class ChunkPrefetchStartupRuntimeModule extends RuntimeModule {
/**
* @param {{ onChunks: Chunk[], chunks: Set<Chunk> }[]} startupChunks chunk ids to trigger when chunks are loaded
*/
constructor(startupChunks) {
super("startup prefetch", RuntimeModule.STAGE_TRIGGER);
this.startupChunks = startupChunks;
}
/**
* @returns {string | null} runtime code
*/
generate() {
const { startupChunks } = this;
const compilation = /** @type {Compilation} */ (this.compilation);
const chunk = /** @type {Chunk} */ (this.chunk);
const { runtimeTemplate } = compilation;
return Template.asString(
startupChunks.map(
({ onChunks, chunks }) =>
`${RuntimeGlobals.onChunksLoaded}(0, ${JSON.stringify(
// This need to include itself to delay execution after this chunk has been fully loaded
onChunks.filter(c => c === chunk).map(c => c.id)
)}, ${runtimeTemplate.basicFunction(
"",
chunks.size < 3
? Array.from(
chunks,
c =>
`${RuntimeGlobals.prefetchChunk}(${JSON.stringify(c.id)});`
)
: `${JSON.stringify(Array.from(chunks, c => c.id))}.map(${
RuntimeGlobals.prefetchChunk
});`
)}, 5);`
)
);
}
}
module.exports = ChunkPrefetchStartupRuntimeModule;
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