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GetChunkFilenameRuntimeModule.js
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Mon, Feb 10, 10:27

GetChunkFilenameRuntimeModule.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("../Chunk")} Chunk */
/** @typedef {import("../Compilation")} Compilation */
/** @typedef {import("../Compilation").AssetInfo} AssetInfo */
/** @typedef {import("../Compilation").PathData} PathData */
/** @typedef {function(PathData, AssetInfo=): string} FilenameFunction */
class GetChunkFilenameRuntimeModule extends RuntimeModule {
/**
* @param {string} contentType the contentType to use the content hash for
* @param {string} name kind of filename
* @param {string} global function name to be assigned
* @param {function(Chunk): string | FilenameFunction} getFilenameForChunk functor to get the filename or function
* @param {boolean} allChunks when false, only async chunks are included
*/
constructor(contentType, name, global, getFilenameForChunk, allChunks) {
super(`get ${name} chunk filename`);
this.contentType = contentType;
this.global = global;
this.getFilenameForChunk = getFilenameForChunk;
this.allChunks = allChunks;
}
/**
* @returns {string} runtime code
*/
generate() {
const {
global,
chunk,
contentType,
getFilenameForChunk,
allChunks,
compilation
} = this;
const { runtimeTemplate } = compilation;
/** @type {Map<string | FilenameFunction, Set<Chunk>>} */
const chunkFilenames = new Map();
let maxChunks = 0;
/** @type {string} */
let dynamicFilename;
/**
* @param {Chunk} c the chunk
* @returns {void}
*/
const addChunk = c => {
const chunkFilename = getFilenameForChunk(c);
if (chunkFilename) {
let set = chunkFilenames.get(chunkFilename);
if (set === undefined) {
chunkFilenames.set(chunkFilename, (set = new Set()));
}
set.add(c);
if (typeof chunkFilename === "string") {
if (set.size < maxChunks) return;
if (set.size === maxChunks) {
if (chunkFilename.length < dynamicFilename.length) return;
if (chunkFilename.length === dynamicFilename.length) {
if (chunkFilename < dynamicFilename) return;
}
}
maxChunks = set.size;
dynamicFilename = chunkFilename;
}
}
};
/** @type {string[]} */
const includedChunksMessages = [];
if (allChunks) {
includedChunksMessages.push("all chunks");
for (const c of chunk.getAllReferencedChunks()) {
addChunk(c);
}
} else {
includedChunksMessages.push("async chunks");
for (const c of chunk.getAllAsyncChunks()) {
addChunk(c);
}
const includeEntries = compilation.chunkGraph
.getTreeRuntimeRequirements(chunk)
.has(RuntimeGlobals.ensureChunkIncludeEntries);
if (includeEntries) {
includedChunksMessages.push("sibling chunks for the entrypoint");
for (const c of compilation.chunkGraph.getChunkEntryDependentChunksIterable(
chunk
)) {
addChunk(c);
}
}
}
for (const entrypoint of chunk.getAllReferencedAsyncEntrypoints()) {
addChunk(entrypoint.chunks[entrypoint.chunks.length - 1]);
}
/** @type {Map<string, Set<string | number>>} */
const staticUrls = new Map();
/** @type {Set<Chunk>} */
const dynamicUrlChunks = new Set();
/**
* @param {Chunk} c the chunk
* @param {string | FilenameFunction} chunkFilename the filename template for the chunk
* @returns {void}
*/
const addStaticUrl = (c, chunkFilename) => {
/**
* @param {string | number} value a value
* @returns {string} string to put in quotes
*/
const unquotedStringify = value => {
const str = `${value}`;
if (str.length >= 5 && str === `${c.id}`) {
// This is shorter and generates the same result
return '" + chunkId + "';
}
const s = JSON.stringify(str);
return s.slice(1, s.length - 1);
};
const unquotedStringifyWithLength = value => length =>
unquotedStringify(`${value}`.slice(0, length));
const chunkFilenameValue =
typeof chunkFilename === "function"
? JSON.stringify(
chunkFilename({
chunk: c,
contentHashType: contentType
})
)
: JSON.stringify(chunkFilename);
const staticChunkFilename = compilation.getPath(chunkFilenameValue, {
hash: `" + ${RuntimeGlobals.getFullHash}() + "`,
hashWithLength: length =>
`" + ${RuntimeGlobals.getFullHash}().slice(0, ${length}) + "`,
chunk: {
id: unquotedStringify(c.id),
hash: unquotedStringify(c.renderedHash),
hashWithLength: unquotedStringifyWithLength(c.renderedHash),
name: unquotedStringify(c.name || c.id),
contentHash: {
[contentType]: unquotedStringify(c.contentHash[contentType])
},
contentHashWithLength: {
[contentType]: unquotedStringifyWithLength(
c.contentHash[contentType]
)
}
},
contentHashType: contentType
});
let set = staticUrls.get(staticChunkFilename);
if (set === undefined) {
staticUrls.set(staticChunkFilename, (set = new Set()));
}
set.add(c.id);
};
for (const [filename, chunks] of chunkFilenames) {
if (filename !== dynamicFilename) {
for (const c of chunks) addStaticUrl(c, filename);
} else {
for (const c of chunks) dynamicUrlChunks.add(c);
}
}
/**
* @param {function(Chunk): string | number} fn function from chunk to value
* @returns {string} code with static mapping of results of fn
*/
const createMap = fn => {
const obj = {};
let useId = false;
let lastKey;
let entries = 0;
for (const c of dynamicUrlChunks) {
const value = fn(c);
if (value === c.id) {
useId = true;
} else {
obj[c.id] = value;
lastKey = c.id;
entries++;
}
}
if (entries === 0) return "chunkId";
if (entries === 1) {
return useId
? `(chunkId === ${JSON.stringify(lastKey)} ? ${JSON.stringify(
obj[lastKey]
)} : chunkId)`
: JSON.stringify(obj[lastKey]);
}
return useId
? `(${JSON.stringify(obj)}[chunkId] || chunkId)`
: `${JSON.stringify(obj)}[chunkId]`;
};
/**
* @param {function(Chunk): string | number} fn function from chunk to value
* @returns {string} code with static mapping of results of fn for including in quoted string
*/
const mapExpr = fn => {
return `" + ${createMap(fn)} + "`;
};
/**
* @param {function(Chunk): string | number} fn function from chunk to value
* @returns {function(number): string} function which generates code with static mapping of results of fn for including in quoted string for specific length
*/
const mapExprWithLength = fn => length => {
return `" + ${createMap(c => `${fn(c)}`.slice(0, length))} + "`;
};
const url =
dynamicFilename &&
compilation.getPath(JSON.stringify(dynamicFilename), {
hash: `" + ${RuntimeGlobals.getFullHash}() + "`,
hashWithLength: length =>
`" + ${RuntimeGlobals.getFullHash}().slice(0, ${length}) + "`,
chunk: {
id: `" + chunkId + "`,
hash: mapExpr(c => c.renderedHash),
hashWithLength: mapExprWithLength(c => c.renderedHash),
name: mapExpr(c => c.name || c.id),
contentHash: {
[contentType]: mapExpr(c => c.contentHash[contentType])
},
contentHashWithLength: {
[contentType]: mapExprWithLength(c => c.contentHash[contentType])
}
},
contentHashType: contentType
});
return Template.asString([
`// This function allow to reference ${includedChunksMessages.join(
" and "
)}`,
`${global} = ${runtimeTemplate.basicFunction(
"chunkId",
staticUrls.size > 0
? [
"// return url for filenames not based on template",
// it minimizes to `x===1?"...":x===2?"...":"..."`
Template.asString(
Array.from(staticUrls, ([url, ids]) => {
const condition =
ids.size === 1
? `chunkId === ${JSON.stringify(
ids.values().next().value
)}`
: `{${Array.from(
ids,
id => `${JSON.stringify(id)}:1`
).join(",")}}[chunkId]`;
return `if (${condition}) return ${url};`;
})
),
"// return url for filenames based on template",
`return ${url};`
]
: ["// return url for filenames based on template", `return ${url};`]
)};`
]);
}
}
module.exports = GetChunkFilenameRuntimeModule;

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