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AssetScript.js
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AssetScript.js
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const path = require('path');
const Asset = require('./Asset');
const AssetEntry = require('./AssetEntry');
const { scriptStore } = require('./Modules');
const { isWin, pathToPosix } = require('./Utils');
class AssetScript {
static index = {};
/**
* Clear cache.
* This method is called only once, when the plugin is applied.
*/
static clear() {
this.index = {};
scriptStore.clear();
}
/**
* Reset settings.
* This method is called before each compilation after changes by `webpack serv/watch`.
*/
static reset() {
this.index = {};
}
/**
* @param {{__isScript?:boolean|undefined, resource:string}} module The Webpack chunk module.
* Properties:<br>
* __isScript is cached state whether the Webpack module was resolved as JavaScript;<br>
* resource is source file of Webpack module.
*
* @return {boolean}
*/
static isScript(module) {
if (module.__isScript == null) {
let [scriptFile] = module.resource.split('?', 1);
if (isWin) scriptFile = pathToPosix(scriptFile);
module.__isScript = scriptStore.has(scriptFile);
}
return module.__isScript;
}
/**
* @param {string} file The source file of script.
* @return {string } Return unique assetFile
*/
static getUniqueName(file) {
const { name } = path.parse(file);
let uniqueName = name;
// the entrypoint name must be unique, if already exists then add an index: `main` => `main.1`, etc.
if (!AssetEntry.isUnique(name, file)) {
if (!this.index[name]) {
this.index[name] = 1;
}
uniqueName = name + '.' + this.index[name]++;
}
return uniqueName;
}
/**
* @param {string} issuer The source file of issuer of the required file.
* @param {string} filename The asset filename of issuer.
*/
static setIssuerFilename(issuer, filename) {
scriptStore.setIssuerFilename(issuer, filename);
}
/**
* Resolve script file from request.
*
* @param {string} request The asset request.
* @return {string|null} Return null if the request is not a script required in the template.
*/
static resolveFile(request) {
const [resource] = request.split('?', 1);
return scriptStore.has(resource) ? resource : null;
}
/**
* Replace all required source filenames with generating asset filenames.
* Note: this method must be called in the afterProcessAssets compilation hook.
*
* @param {Compilation} compilation The instance of the webpack compilation.
*/
static replaceSourceFilesInCompilation(compilation) {
const {
assets,
assetsInfo,
chunks,
namedChunkGroups,
compiler: {
webpack: {
sources: { RawSource },
},
},
} = compilation;
const usedScripts = new Map();
const realSplitFiles = new Set();
const allSplitFiles = new Set();
const trashFiles = new Set();
for (let chunk of chunks) {
if (chunk.chunkReason && chunk.chunkReason.startsWith('split chunk')) {
allSplitFiles.add(...chunk.files);
}
}
// in the content, replace the source script file with the output filename
for (let asset of scriptStore.getAll()) {
const issuerFile = asset.issuer.filename;
if (!assets.hasOwnProperty(issuerFile)) {
// let's show an original error
continue;
}
// init script cache by current issuer
if (!usedScripts.has(issuerFile)) {
usedScripts.set(issuerFile, new Set());
}
const { name, file: sourceFile } = asset;
const chunkGroup = namedChunkGroups.get(name);
if (!chunkGroup) {
// prevent error when in HMR mode after removing a script in the template
continue;
}
const chunkFiles = chunkGroup.getFiles().filter((file) => assetsInfo.get(file).hotModuleReplacement !== true);
const content = assets[issuerFile].source();
let newContent = content;
let scriptTags = '';
// replace source filename with asset filename
if (chunkFiles.length === 1) {
const chunkFile = chunkFiles.values().next().value;
const assetFile = Asset.getOutputFile(chunkFile, issuerFile);
if (asset.inline === true) {
const source = assets[assetFile].source();
newContent = content.replace(sourceFile, source);
trashFiles.add(assetFile);
} else {
newContent = content.replace(sourceFile, assetFile);
realSplitFiles.add(chunkFile);
}
// add verbose info
asset.chunkFiles = assetFile;
} else {
// extract original script tag with all attributes for usage it as template for chunks
let srcStartPos = content.indexOf(sourceFile);
let srcEndPos = srcStartPos + sourceFile.length;
let tagStartPos = srcStartPos;
let tagEndPos = srcEndPos;
while (tagStartPos >= 0 && content.charAt(--tagStartPos) !== '<') {}
tagEndPos = content.indexOf('</script>', tagEndPos) + 9;
const tmplScriptStart = content.slice(tagStartPos, srcStartPos);
const tmplScriptEnd = content.slice(srcEndPos, tagEndPos);
// generate additional scripts of chunks
const chunkScripts = usedScripts.get(issuerFile);
for (let chunkFile of chunkFiles) {
// avoid generate a script of the same split chunk used in different js files required in one template file,
// happens when used optimisation.splitChunks
if (!chunkScripts.has(chunkFile)) {
const assetFile = Asset.getOutputFile(chunkFile, issuerFile);
scriptTags += tmplScriptStart + assetFile + tmplScriptEnd;
chunkScripts.add(chunkFile);
realSplitFiles.add(chunkFile);
}
}
// inject generated chunks <script> and replace source file with output filename
if (scriptTags) {
newContent = content.slice(0, tagStartPos) + scriptTags + content.slice(tagEndPos);
}
// add verbose info
asset.chunkFiles = chunkFiles;
}
// update compilation asset content
assets[issuerFile] = new RawSource(newContent);
}
// remove generated unused split files
for (let file of allSplitFiles) {
if (!realSplitFiles.has(file)) {
compilation.deleteAsset(file);
}
}
// remove trash files
for (let file of trashFiles) {
compilation.deleteAsset(file);
}
}
}
module.exports = AssetScript;