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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const { ConcatSource, RawSource, CachedSource } = require("webpack-sources");
const { UsageState } = require("./ExportsInfo");
const Template = require("./Template");
const JavascriptModulesPlugin = require("./javascript/JavascriptModulesPlugin");
/** @typedef {import("webpack-sources").Source} Source */
/** @typedef {import("./Compiler")} Compiler */
/** @typedef {import("./ExportsInfo")} ExportsInfo */
/** @typedef {import("./ExportsInfo").ExportInfo} ExportInfo */
/** @typedef {import("./Module")} Module */
/** @typedef {import("./ModuleGraph")} ModuleGraph */
/** @typedef {import("./ModuleTemplate")} ModuleTemplate */
/** @typedef {import("./RequestShortener")} RequestShortener */
const joinIterableWithComma = iterable => {
// This is more performant than Array.from().join(", ")
// as it doesn't create an array
let str = "";
let first = true;
for (const item of iterable) {
if (first) {
first = false;
} else {
str += ", ";
}
str += item;
}
return str;
};
/**
* @param {ConcatSource} source output
* @param {string} indent spacing
* @param {ExportsInfo} exportsInfo data
* @param {ModuleGraph} moduleGraph moduleGraph
* @param {RequestShortener} requestShortener requestShortener
* @param {Set<ExportInfo>} alreadyPrinted deduplication set
* @returns {void}
*/
const printExportsInfoToSource = (
source,
indent,
exportsInfo,
moduleGraph,
requestShortener,
alreadyPrinted = new Set()
) => {
const otherExportsInfo = exportsInfo.otherExportsInfo;
let alreadyPrintedExports = 0;
// determine exports to print
const printedExports = [];
for (const exportInfo of exportsInfo.orderedExports) {
if (!alreadyPrinted.has(exportInfo)) {
alreadyPrinted.add(exportInfo);
printedExports.push(exportInfo);
} else {
alreadyPrintedExports++;
}
}
let showOtherExports = false;
if (!alreadyPrinted.has(otherExportsInfo)) {
alreadyPrinted.add(otherExportsInfo);
showOtherExports = true;
} else {
alreadyPrintedExports++;
}
// print the exports
for (const exportInfo of printedExports) {
const target = exportInfo.getTarget(moduleGraph);
source.add(
Template.toComment(
`${indent}export ${JSON.stringify(exportInfo.name).slice(
1,
-1
)} [${exportInfo.getProvidedInfo()}] [${exportInfo.getUsedInfo()}] [${exportInfo.getRenameInfo()}]${
target
? ` -> ${target.module.readableIdentifier(requestShortener)}${
target.export
? ` .${target.export
.map(e => JSON.stringify(e).slice(1, -1))
.join(".")}`
: ""
}`
: ""
}`
) + "\n"
);
if (exportInfo.exportsInfo) {
printExportsInfoToSource(
source,
indent + " ",
exportInfo.exportsInfo,
moduleGraph,
requestShortener,
alreadyPrinted
);
}
}
if (alreadyPrintedExports) {
source.add(
Template.toComment(
`${indent}... (${alreadyPrintedExports} already listed exports)`
) + "\n"
);
}
if (showOtherExports) {
const target = otherExportsInfo.getTarget(moduleGraph);
if (
target ||
otherExportsInfo.provided !== false ||
otherExportsInfo.getUsed(undefined) !== UsageState.Unused
) {
const title =
printedExports.length > 0 || alreadyPrintedExports > 0
? "other exports"
: "exports";
source.add(
Template.toComment(
`${indent}${title} [${otherExportsInfo.getProvidedInfo()}] [${otherExportsInfo.getUsedInfo()}]${
target
? ` -> ${target.module.readableIdentifier(requestShortener)}`
: ""
}`
) + "\n"
);
}
}
};
/** @type {WeakMap<RequestShortener, WeakMap<Module, { header: RawSource, full: WeakMap<Source, CachedSource> }>>} */
const caches = new WeakMap();
class ModuleInfoHeaderPlugin {
/**
* @param {boolean=} verbose add more information like exports, runtime requirements and bailouts
*/
constructor(verbose = true) {
this._verbose = verbose;
}
/**
* @param {Compiler} compiler the compiler
* @returns {void}
*/
apply(compiler) {
const { _verbose: verbose } = this;
compiler.hooks.compilation.tap("ModuleInfoHeaderPlugin", compilation => {
const hooks = JavascriptModulesPlugin.getCompilationHooks(compilation);
hooks.renderModulePackage.tap(
"ModuleInfoHeaderPlugin",
(
moduleSource,
module,
{ chunk, chunkGraph, moduleGraph, runtimeTemplate }
) => {
const { requestShortener } = runtimeTemplate;
let cacheEntry;
let cache = caches.get(requestShortener);
if (cache === undefined) {
caches.set(requestShortener, (cache = new WeakMap()));
cache.set(
module,
(cacheEntry = { header: undefined, full: new WeakMap() })
);
} else {
cacheEntry = cache.get(module);
if (cacheEntry === undefined) {
cache.set(
module,
(cacheEntry = { header: undefined, full: new WeakMap() })
);
} else if (!verbose) {
const cachedSource = cacheEntry.full.get(moduleSource);
if (cachedSource !== undefined) return cachedSource;
}
}
const source = new ConcatSource();
let header = cacheEntry.header;
if (header === undefined) {
const req = module.readableIdentifier(requestShortener);
const reqStr = req.replace(/\*\//g, "*_/");
const reqStrStar = "*".repeat(reqStr.length);
const headerStr = `/*!****${reqStrStar}****!*\\\n !*** ${reqStr} ***!\n \\****${reqStrStar}****/\n`;
header = new RawSource(headerStr);
cacheEntry.header = header;
}
source.add(header);
if (verbose) {
const exportsType = module.buildMeta.exportsType;
source.add(
Template.toComment(
exportsType
? `${exportsType} exports`
: "unknown exports (runtime-defined)"
) + "\n"
);
if (exportsType) {
const exportsInfo = moduleGraph.getExportsInfo(module);
printExportsInfoToSource(
source,
"",
exportsInfo,
moduleGraph,
requestShortener
);
}
source.add(
Template.toComment(
`runtime requirements: ${joinIterableWithComma(
chunkGraph.getModuleRuntimeRequirements(module, chunk.runtime)
)}`
) + "\n"
);
const optimizationBailout =
moduleGraph.getOptimizationBailout(module);
if (optimizationBailout) {
for (const text of optimizationBailout) {
let code;
if (typeof text === "function") {
code = text(requestShortener);
} else {
code = text;
}
source.add(Template.toComment(`${code}`) + "\n");
}
}
source.add(moduleSource);
return source;
} else {
source.add(moduleSource);
const cachedSource = new CachedSource(source);
cacheEntry.full.set(moduleSource, cachedSource);
return cachedSource;
}
}
);
hooks.chunkHash.tap("ModuleInfoHeaderPlugin", (chunk, hash) => {
hash.update("ModuleInfoHeaderPlugin");
hash.update("1");
});
});
}
}
module.exports = ModuleInfoHeaderPlugin;