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AssetGenerator.js
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Tue, Jul 8, 16:17

AssetGenerator.js
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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Sergey Melyukov @smelukov
*/
"use strict";
const mimeTypes = require("mime-types");
const path = require("path");
const { RawSource } = require("webpack-sources");
const Generator = require("../Generator");
const RuntimeGlobals = require("../RuntimeGlobals");
const createHash = require("../util/createHash");
const { makePathsRelative } = require("../util/identifier");
/** @typedef {import("webpack-sources").Source} Source */
/** @typedef {import("../../declarations/plugins/AssetModulesPluginGenerator").AssetModulesPluginGeneratorOptions} AssetModulesPluginGeneratorOptions */
/** @typedef {import("../Compilation")} Compilation */
/** @typedef {import("../Compiler")} Compiler */
/** @typedef {import("../Generator").GenerateContext} GenerateContext */
/** @typedef {import("../Generator").UpdateHashContext} UpdateHashContext */
/** @typedef {import("../Module")} Module */
/** @typedef {import("../NormalModule")} NormalModule */
/** @typedef {import("../RuntimeTemplate")} RuntimeTemplate */
/** @typedef {import("../util/Hash")} Hash */
const JS_TYPES = new Set(["javascript"]);
const JS_AND_ASSET_TYPES = new Set(["javascript", "asset"]);
class AssetGenerator extends Generator {
/**
* @param {Compilation} compilation the compilation
* @param {AssetModulesPluginGeneratorOptions["dataUrl"]=} dataUrlOptions the options for the data url
* @param {string=} filename override for output.assetModuleFilename
*/
constructor(compilation, dataUrlOptions, filename) {
super();
this.compilation = compilation;
this.dataUrlOptions = dataUrlOptions;
this.filename = filename;
}
/**
* @param {NormalModule} module module for which the code should be generated
* @param {GenerateContext} generateContext context for generate
* @returns {Source} generated code
*/
generate(
module,
{ runtime, chunkGraph, runtimeTemplate, runtimeRequirements, type }
) {
switch (type) {
case "asset":
return module.originalSource();
default: {
runtimeRequirements.add(RuntimeGlobals.module);
const originalSource = module.originalSource();
if (module.buildInfo.dataUrl) {
let encodedSource;
if (typeof this.dataUrlOptions === "function") {
encodedSource = this.dataUrlOptions.call(
null,
originalSource.source(),
{
filename: module.matchResource || module.resource,
module
}
);
} else {
const encoding = this.dataUrlOptions.encoding;
const ext = path.extname(module.nameForCondition());
const mimeType =
this.dataUrlOptions.mimetype || mimeTypes.lookup(ext);
if (!mimeType) {
throw new Error(
"DataUrl can't be generated automatically, " +
`because there is no mimetype for "${ext}" in mimetype database. ` +
'Either pass a mimetype via "generator.mimetype" or ' +
'use type: "asset/resource" to create a resource file instead of a DataUrl'
);
}
let encodedContent;
switch (encoding) {
case "base64": {
encodedContent = originalSource.buffer().toString("base64");
break;
}
case false: {
const content = originalSource.source();
if (typeof content === "string") {
encodedContent = encodeURI(content);
} else {
encodedContent = encodeURI(content.toString("utf-8"));
}
break;
}
default:
throw new Error(`Unsupported encoding '${encoding}'`);
}
encodedSource = `data:${mimeType}${
encoding ? `;${encoding}` : ""
},${encodedContent}`;
}
return new RawSource(
`${RuntimeGlobals.module}.exports = ${JSON.stringify(
encodedSource
)};`
);
} else {
const assetModuleFilename =
this.filename || runtimeTemplate.outputOptions.assetModuleFilename;
const hash = createHash(runtimeTemplate.outputOptions.hashFunction);
if (runtimeTemplate.outputOptions.hashSalt) {
hash.update(runtimeTemplate.outputOptions.hashSalt);
}
hash.update(originalSource.buffer());
const fullHash = /** @type {string} */ (hash.digest(
runtimeTemplate.outputOptions.hashDigest
));
const contentHash = fullHash.slice(
0,
runtimeTemplate.outputOptions.hashDigestLength
);
module.buildInfo.fullContentHash = fullHash;
const sourceFilename = makePathsRelative(
this.compilation.compiler.context,
module.matchResource || module.resource,
this.compilation.compiler.root
).replace(/^\.\//, "");
const {
path: filename,
info
} = this.compilation.getAssetPathWithInfo(assetModuleFilename, {
module,
runtime,
filename: sourceFilename,
chunkGraph,
contentHash
});
module.buildInfo.filename = filename;
module.buildInfo.assetInfo = {
sourceFilename,
...info
};
runtimeRequirements.add(RuntimeGlobals.publicPath); // add __webpack_require__.p
return new RawSource(
`${RuntimeGlobals.module}.exports = ${
RuntimeGlobals.publicPath
} + ${JSON.stringify(filename)};`
);
}
}
}
}
/**
* @param {NormalModule} module fresh module
* @returns {Set<string>} available types (do not mutate)
*/
getTypes(module) {
if (module.buildInfo.dataUrl) {
return JS_TYPES;
} else {
return JS_AND_ASSET_TYPES;
}
}
/**
* @param {NormalModule} module the module
* @param {string=} type source type
* @returns {number} estimate size of the module
*/
getSize(module, type) {
switch (type) {
case "asset": {
const originalSource = module.originalSource();
if (!originalSource) {
return 0;
}
return originalSource.size();
}
default:
if (module.buildInfo.dataUrl) {
const originalSource = module.originalSource();
if (!originalSource) {
return 0;
}
// roughly for data url
// Example: m.exports="data:image/png;base64,ag82/f+2=="
// 4/3 = base64 encoding
// 34 = ~ data url header + footer + rounding
return originalSource.size() * 1.34 + 36;
} else {
// it's only estimated so this number is probably fine
// Example: m.exports=r.p+"0123456789012345678901.ext"
return 42;
}
}
}
/**
* @param {Hash} hash hash that will be modified
* @param {UpdateHashContext} updateHashContext context for updating hash
*/
updateHash(hash, { module }) {
hash.update(module.buildInfo.dataUrl ? "data-url" : "resource");
}
}
module.exports = AssetGenerator;

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