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SourceMapDevToolPlugin.js
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Wed, Feb 5, 16:03

SourceMapDevToolPlugin.js
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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const asyncLib = require("neo-async");
const { validate } = require("schema-utils");
const { ConcatSource, RawSource } = require("webpack-sources");
const Compilation = require("./Compilation");
const ModuleFilenameHelpers = require("./ModuleFilenameHelpers");
const ProgressPlugin = require("./ProgressPlugin");
const SourceMapDevToolModuleOptionsPlugin = require("./SourceMapDevToolModuleOptionsPlugin");
const createHash = require("./util/createHash");
const { relative, dirname } = require("./util/fs");
const { absolutify } = require("./util/identifier");
const schema = require("../schemas/plugins/SourceMapDevToolPlugin.json");
/** @typedef {import("source-map").RawSourceMap} SourceMap */
/** @typedef {import("webpack-sources").MapOptions} MapOptions */
/** @typedef {import("webpack-sources").Source} Source */
/** @typedef {import("../declarations/plugins/SourceMapDevToolPlugin").SourceMapDevToolPluginOptions} SourceMapDevToolPluginOptions */
/** @typedef {import("./Cache").Etag} Etag */
/** @typedef {import("./CacheFacade").ItemCacheFacade} ItemCacheFacade */
/** @typedef {import("./Chunk")} Chunk */
/** @typedef {import("./Compilation").AssetInfo} AssetInfo */
/** @typedef {import("./Compiler")} Compiler */
/** @typedef {import("./Module")} Module */
/** @typedef {import("./util/Hash")} Hash */
/**
* @typedef {object} SourceMapTask
* @property {Source} asset
* @property {AssetInfo} assetInfo
* @property {(string | Module)[]} modules
* @property {string} source
* @property {string} file
* @property {SourceMap} sourceMap
* @property {ItemCacheFacade} cacheItem cache item
*/
/**
* Escapes regular expression metacharacters
* @param {string} str String to quote
* @returns {string} Escaped string
*/
const quoteMeta = str => {
return str.replace(/[-[\]\\/{}()*+?.^$|]/g, "\\$&");
};
/**
* Creating {@link SourceMapTask} for given file
* @param {string} file current compiled file
* @param {Source} asset the asset
* @param {AssetInfo} assetInfo the asset info
* @param {MapOptions} options source map options
* @param {Compilation} compilation compilation instance
* @param {ItemCacheFacade} cacheItem cache item
* @returns {SourceMapTask | undefined} created task instance or `undefined`
*/
const getTaskForFile = (
file,
asset,
assetInfo,
options,
compilation,
cacheItem
) => {
let source;
/** @type {SourceMap} */
let sourceMap;
/**
* Check if asset can build source map
*/
if (asset.sourceAndMap) {
const sourceAndMap = asset.sourceAndMap(options);
sourceMap = /** @type {SourceMap} */ (sourceAndMap.map);
source = sourceAndMap.source;
} else {
sourceMap = /** @type {SourceMap} */ (asset.map(options));
source = asset.source();
}
if (!sourceMap || typeof source !== "string") return;
const context = compilation.options.context;
const root = compilation.compiler.root;
const cachedAbsolutify = absolutify.bindContextCache(context, root);
const modules = sourceMap.sources.map(source => {
if (!source.startsWith("webpack://")) return source;
source = cachedAbsolutify(source.slice(10));
const module = compilation.findModule(source);
return module || source;
});
return {
file,
asset,
source,
assetInfo,
sourceMap,
modules,
cacheItem
};
};
class SourceMapDevToolPlugin {
/**
* @param {SourceMapDevToolPluginOptions} [options] options object
* @throws {Error} throws error, if got more than 1 arguments
*/
constructor(options = {}) {
validate(schema, options, {
name: "SourceMap DevTool Plugin",
baseDataPath: "options"
});
/** @type {string | false} */
this.sourceMapFilename = options.filename;
/** @type {string | false} */
this.sourceMappingURLComment =
options.append === false
? false
: options.append || "\n//# source" + "MappingURL=[url]";
/** @type {string | Function} */
this.moduleFilenameTemplate =
options.moduleFilenameTemplate || "webpack://[namespace]/[resourcePath]";
/** @type {string | Function} */
this.fallbackModuleFilenameTemplate =
options.fallbackModuleFilenameTemplate ||
"webpack://[namespace]/[resourcePath]?[hash]";
/** @type {string} */
this.namespace = options.namespace || "";
/** @type {SourceMapDevToolPluginOptions} */
this.options = options;
}
/**
* Apply the plugin
* @param {Compiler} compiler compiler instance
* @returns {void}
*/
apply(compiler) {
const outputFs = compiler.outputFileSystem;
const sourceMapFilename = this.sourceMapFilename;
const sourceMappingURLComment = this.sourceMappingURLComment;
const moduleFilenameTemplate = this.moduleFilenameTemplate;
const namespace = this.namespace;
const fallbackModuleFilenameTemplate = this.fallbackModuleFilenameTemplate;
const requestShortener = compiler.requestShortener;
const options = this.options;
options.test = options.test || /\.(m?js|css)($|\?)/i;
const matchObject = ModuleFilenameHelpers.matchObject.bind(
undefined,
options
);
compiler.hooks.compilation.tap("SourceMapDevToolPlugin", compilation => {
new SourceMapDevToolModuleOptionsPlugin(options).apply(compilation);
compilation.hooks.processAssets.tapAsync(
{
name: "SourceMapDevToolPlugin",
stage: Compilation.PROCESS_ASSETS_STAGE_DEV_TOOLING,
additionalAssets: true
},
(assets, callback) => {
const chunkGraph = compilation.chunkGraph;
const cache = compilation.getCache("SourceMapDevToolPlugin");
/** @type {Map<string | Module, string>} */
const moduleToSourceNameMapping = new Map();
/**
* @type {Function}
* @returns {void}
*/
const reportProgress =
ProgressPlugin.getReporter(compilation.compiler) || (() => {});
/** @type {Map<string, Chunk>} */
const fileToChunk = new Map();
for (const chunk of compilation.chunks) {
for (const file of chunk.files) {
fileToChunk.set(file, chunk);
}
for (const file of chunk.auxiliaryFiles) {
fileToChunk.set(file, chunk);
}
}
/** @type {string[]} */
const files = [];
for (const file of Object.keys(assets)) {
if (matchObject(file)) {
files.push(file);
}
}
reportProgress(0.0);
/** @type {SourceMapTask[]} */
const tasks = [];
let fileIndex = 0;
asyncLib.each(
files,
(file, callback) => {
const asset = compilation.getAsset(file);
if (asset.info.related && asset.info.related.sourceMap) {
fileIndex++;
return callback();
}
const cacheItem = cache.getItemCache(
file,
cache.getLazyHashedEtag(asset.source)
);
cacheItem.get((err, cacheEntry) => {
if (err) {
return callback(err);
}
/**
* If presented in cache, reassigns assets. Cache assets already have source maps.
*/
if (cacheEntry) {
const { assets, assetsInfo } = cacheEntry;
for (const cachedFile of Object.keys(assets)) {
if (cachedFile === file) {
compilation.updateAsset(
cachedFile,
assets[cachedFile],
assetsInfo[cachedFile]
);
} else {
compilation.emitAsset(
cachedFile,
assets[cachedFile],
assetsInfo[cachedFile]
);
}
/**
* Add file to chunk, if not presented there
*/
if (cachedFile !== file) {
const chunk = fileToChunk.get(file);
if (chunk !== undefined)
chunk.auxiliaryFiles.add(cachedFile);
}
}
reportProgress(
(0.5 * ++fileIndex) / files.length,
file,
"restored cached SourceMap"
);
return callback();
}
reportProgress(
(0.5 * fileIndex) / files.length,
file,
"generate SourceMap"
);
/** @type {SourceMapTask | undefined} */
const task = getTaskForFile(
file,
asset.source,
asset.info,
{
module: options.module,
columns: options.columns
},
compilation,
cacheItem
);
if (task) {
const modules = task.modules;
for (let idx = 0; idx < modules.length; idx++) {
const module = modules[idx];
if (!moduleToSourceNameMapping.get(module)) {
moduleToSourceNameMapping.set(
module,
ModuleFilenameHelpers.createFilename(
module,
{
moduleFilenameTemplate: moduleFilenameTemplate,
namespace: namespace
},
{
requestShortener,
chunkGraph
}
)
);
}
}
tasks.push(task);
}
reportProgress(
(0.5 * ++fileIndex) / files.length,
file,
"generated SourceMap"
);
callback();
});
},
err => {
if (err) {
return callback(err);
}
reportProgress(0.5, "resolve sources");
/** @type {Set<string>} */
const usedNamesSet = new Set(moduleToSourceNameMapping.values());
/** @type {Set<string>} */
const conflictDetectionSet = new Set();
/**
* all modules in defined order (longest identifier first)
* @type {Array<string | Module>}
*/
const allModules = Array.from(
moduleToSourceNameMapping.keys()
).sort((a, b) => {
const ai = typeof a === "string" ? a : a.identifier();
const bi = typeof b === "string" ? b : b.identifier();
return ai.length - bi.length;
});
// find modules with conflicting source names
for (let idx = 0; idx < allModules.length; idx++) {
const module = allModules[idx];
let sourceName = moduleToSourceNameMapping.get(module);
let hasName = conflictDetectionSet.has(sourceName);
if (!hasName) {
conflictDetectionSet.add(sourceName);
continue;
}
// try the fallback name first
sourceName = ModuleFilenameHelpers.createFilename(
module,
{
moduleFilenameTemplate: fallbackModuleFilenameTemplate,
namespace: namespace
},
{
requestShortener,
chunkGraph
}
);
hasName = usedNamesSet.has(sourceName);
if (!hasName) {
moduleToSourceNameMapping.set(module, sourceName);
usedNamesSet.add(sourceName);
continue;
}
// otherwise just append stars until we have a valid name
while (hasName) {
sourceName += "*";
hasName = usedNamesSet.has(sourceName);
}
moduleToSourceNameMapping.set(module, sourceName);
usedNamesSet.add(sourceName);
}
let taskIndex = 0;
asyncLib.each(
tasks,
(task, callback) => {
const assets = Object.create(null);
const assetsInfo = Object.create(null);
const file = task.file;
const chunk = fileToChunk.get(file);
const sourceMap = task.sourceMap;
const source = task.source;
const modules = task.modules;
reportProgress(
0.5 + (0.5 * taskIndex) / tasks.length,
file,
"attach SourceMap"
);
const moduleFilenames = modules.map(m =>
moduleToSourceNameMapping.get(m)
);
sourceMap.sources = moduleFilenames;
if (options.noSources) {
sourceMap.sourcesContent = undefined;
}
sourceMap.sourceRoot = options.sourceRoot || "";
sourceMap.file = file;
const usesContentHash =
sourceMapFilename &&
/\[contenthash(:\w+)?\]/.test(sourceMapFilename);
// If SourceMap and asset uses contenthash, avoid a circular dependency by hiding hash in `file`
if (usesContentHash && task.assetInfo.contenthash) {
const contenthash = task.assetInfo.contenthash;
let pattern;
if (Array.isArray(contenthash)) {
pattern = contenthash.map(quoteMeta).join("|");
} else {
pattern = quoteMeta(contenthash);
}
sourceMap.file = sourceMap.file.replace(
new RegExp(pattern, "g"),
m => "x".repeat(m.length)
);
}
/** @type {string | false} */
let currentSourceMappingURLComment = sourceMappingURLComment;
if (
currentSourceMappingURLComment !== false &&
/\.css($|\?)/i.test(file)
) {
currentSourceMappingURLComment = currentSourceMappingURLComment.replace(
/^\n\/\/(.*)$/,
"\n/*$1*/"
);
}
const sourceMapString = JSON.stringify(sourceMap);
if (sourceMapFilename) {
let filename = file;
const sourceMapContentHash =
usesContentHash &&
/** @type {string} */ (createHash("md4")
.update(sourceMapString)
.digest("hex"));
const pathParams = {
chunk,
filename: options.fileContext
? relative(
outputFs,
`/${options.fileContext}`,
`/${filename}`
)
: filename,
contentHash: sourceMapContentHash
};
const {
path: sourceMapFile,
info: sourceMapInfo
} = compilation.getPathWithInfo(
sourceMapFilename,
pathParams
);
const sourceMapUrl = options.publicPath
? options.publicPath + sourceMapFile
: relative(
outputFs,
dirname(outputFs, `/${file}`),
`/${sourceMapFile}`
);
/** @type {Source} */
let asset = new RawSource(source);
if (currentSourceMappingURLComment !== false) {
// Add source map url to compilation asset, if currentSourceMappingURLComment is set
asset = new ConcatSource(
asset,
compilation.getPath(
currentSourceMappingURLComment,
Object.assign({ url: sourceMapUrl }, pathParams)
)
);
}
const assetInfo = {
related: { sourceMap: sourceMapFile }
};
assets[file] = asset;
assetsInfo[file] = assetInfo;
compilation.updateAsset(file, asset, assetInfo);
// Add source map file to compilation assets and chunk files
const sourceMapAsset = new RawSource(sourceMapString);
const sourceMapAssetInfo = {
...sourceMapInfo,
development: true
};
assets[sourceMapFile] = sourceMapAsset;
assetsInfo[sourceMapFile] = sourceMapAssetInfo;
compilation.emitAsset(
sourceMapFile,
sourceMapAsset,
sourceMapAssetInfo
);
if (chunk !== undefined)
chunk.auxiliaryFiles.add(sourceMapFile);
} else {
if (currentSourceMappingURLComment === false) {
throw new Error(
"SourceMapDevToolPlugin: append can't be false when no filename is provided"
);
}
/**
* Add source map as data url to asset
*/
const asset = new ConcatSource(
new RawSource(source),
currentSourceMappingURLComment
.replace(/\[map\]/g, () => sourceMapString)
.replace(
/\[url\]/g,
() =>
`data:application/json;charset=utf-8;base64,${Buffer.from(
sourceMapString,
"utf-8"
).toString("base64")}`
)
);
assets[file] = asset;
assetsInfo[file] = undefined;
compilation.updateAsset(file, asset);
}
task.cacheItem.store({ assets, assetsInfo }, err => {
reportProgress(
0.5 + (0.5 * ++taskIndex) / tasks.length,
task.file,
"attached SourceMap"
);
if (err) {
return callback(err);
}
callback();
});
},
err => {
reportProgress(1.0);
callback(err);
}
);
}
);
}
);
});
}
}
module.exports = SourceMapDevToolPlugin;

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