vue hello world项目
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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const { WebpackError } = require("..");
const { getUsedModuleIdsAndModules } = require("./IdHelpers");
/** @typedef {import("../Compiler")} Compiler */
/** @typedef {import("../Module")} Module */
const plugin = "SyncModuleIdsPlugin";
class SyncModuleIdsPlugin {
/**
* @param {Object} options options
* @param {string} options.path path to file
* @param {string=} options.context context for module names
* @param {function(Module): boolean} options.test selector for modules
* @param {"read" | "create" | "merge" | "update"=} options.mode operation mode (defaults to merge)
*/
constructor({ path, context, test, mode }) {
this._path = path;
this._context = context;
this._test = test || (() => true);
const readAndWrite = !mode || mode === "merge" || mode === "update";
this._read = readAndWrite || mode === "read";
this._write = readAndWrite || mode === "create";
this._prune = mode === "update";
}
/**
* Apply the plugin
* @param {Compiler} compiler the compiler instance
* @returns {void}
*/
apply(compiler) {
/** @type {Map<string, string | number>} */
let data;
let dataChanged = false;
if (this._read) {
compiler.hooks.readRecords.tapAsync(plugin, callback => {
const fs = compiler.intermediateFileSystem;
fs.readFile(this._path, (err, buffer) => {
if (err) {
if (err.code !== "ENOENT") {
return callback(err);
}
return callback();
}
const json = JSON.parse(buffer.toString());
data = new Map();
for (const key of Object.keys(json)) {
data.set(key, json[key]);
}
dataChanged = false;
return callback();
});
});
}
if (this._write) {
compiler.hooks.emitRecords.tapAsync(plugin, callback => {
if (!data || !dataChanged) return callback();
const json = {};
const sorted = Array.from(data).sort(([a], [b]) => (a < b ? -1 : 1));
for (const [key, value] of sorted) {
json[key] = value;
}
const fs = compiler.intermediateFileSystem;
fs.writeFile(this._path, JSON.stringify(json), callback);
});
}
compiler.hooks.thisCompilation.tap(plugin, compilation => {
const associatedObjectForCache = compiler.root;
const context = this._context || compiler.context;
if (this._read) {
compilation.hooks.reviveModules.tap(plugin, (_1, _2) => {
if (!data) return;
const { chunkGraph } = compilation;
const [usedIds, modules] = getUsedModuleIdsAndModules(
compilation,
this._test
);
for (const module of modules) {
const name = module.libIdent({
context,
associatedObjectForCache
});
if (!name) continue;
const id = data.get(name);
const idAsString = `${id}`;
if (usedIds.has(idAsString)) {
const err = new WebpackError(
`SyncModuleIdsPlugin: Unable to restore id '${id}' from '${this._path}' as it's already used.`
);
err.module = module;
compilation.errors.push(err);
}
chunkGraph.setModuleId(module, id);
usedIds.add(idAsString);
}
});
}
if (this._write) {
compilation.hooks.recordModules.tap(plugin, modules => {
const { chunkGraph } = compilation;
let oldData = data;
if (!oldData) {
oldData = data = new Map();
} else if (this._prune) {
data = new Map();
}
for (const module of modules) {
if (this._test(module)) {
const name = module.libIdent({
context,
associatedObjectForCache
});
if (!name) continue;
const id = chunkGraph.getModuleId(module);
if (id === null) continue;
const oldId = oldData.get(name);
if (oldId !== id) {
dataChanged = true;
} else if (data === oldData) {
continue;
}
data.set(name, id);
}
}
if (data.size !== oldData.size) dataChanged = true;
});
}
});
}
}
module.exports = SyncModuleIdsPlugin;