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 { ConcatSource } = require("webpack-sources");
const { UsageState } = require("../ExportsInfo");
const Template = require("../Template");
const propertyAccess = require("../util/propertyAccess");
const { getEntryRuntime } = require("../util/runtime");
const AbstractLibraryPlugin = require("./AbstractLibraryPlugin");
/** @typedef {import("webpack-sources").Source} Source */
/** @typedef {import("../../declarations/WebpackOptions").LibraryOptions} LibraryOptions */
/** @typedef {import("../../declarations/WebpackOptions").LibraryType} LibraryType */
/** @typedef {import("../Chunk")} Chunk */
/** @typedef {import("../Compilation").ChunkHashContext} ChunkHashContext */
/** @typedef {import("../Compiler")} Compiler */
/** @typedef {import("../Module")} Module */
/** @typedef {import("../javascript/JavascriptModulesPlugin").RenderContext} RenderContext */
/** @typedef {import("../javascript/JavascriptModulesPlugin").StartupRenderContext} StartupRenderContext */
/** @typedef {import("../util/Hash")} Hash */
/** @template T @typedef {import("./AbstractLibraryPlugin").LibraryContext<T>} LibraryContext<T> */
const KEYWORD_REGEX =
/^(await|break|case|catch|class|const|continue|debugger|default|delete|do|else|enum|export|extends|false|finally|for|function|if|implements|import|in|instanceof|interface|let|new|null|package|private|protected|public|return|super|switch|static|this|throw|try|true|typeof|var|void|while|with|yield)$/;
const IDENTIFIER_REGEX =
/^[\p{L}\p{Nl}$_][\p{L}\p{Nl}$\p{Mn}\p{Mc}\p{Nd}\p{Pc}]*$/iu;
/**
* Validates the library name by checking for keywords and valid characters
* @param {string} name name to be validated
* @returns {boolean} true, when valid
*/
const isNameValid = name => {
return !KEYWORD_REGEX.test(name) && IDENTIFIER_REGEX.test(name);
};
/**
* @param {string[]} accessor variable plus properties
* @param {number} existingLength items of accessor that are existing already
* @param {boolean=} initLast if the last property should also be initialized to an object
* @returns {string} code to access the accessor while initializing
*/
const accessWithInit = (accessor, existingLength, initLast = false) => {
// This generates for [a, b, c, d]:
// (((a = typeof a === "undefined" ? {} : a).b = a.b || {}).c = a.b.c || {}).d
const base = accessor[0];
if (accessor.length === 1 && !initLast) return base;
let current =
existingLength > 0
? base
: `(${base} = typeof ${base} === "undefined" ? {} : ${base})`;
// i is the current position in accessor that has been printed
let i = 1;
// all properties printed so far (excluding base)
let propsSoFar;
// if there is existingLength, print all properties until this position as property access
if (existingLength > i) {
propsSoFar = accessor.slice(1, existingLength);
i = existingLength;
current += propertyAccess(propsSoFar);
} else {
propsSoFar = [];
}
// all remaining properties (except the last one when initLast is not set)
// should be printed as initializer
const initUntil = initLast ? accessor.length : accessor.length - 1;
for (; i < initUntil; i++) {
const prop = accessor[i];
propsSoFar.push(prop);
current = `(${current}${propertyAccess([prop])} = ${base}${propertyAccess(
propsSoFar
)} || {})`;
}
// print the last property as property access if not yet printed
if (i < accessor.length)
current = `${current}${propertyAccess([accessor[accessor.length - 1]])}`;
return current;
};
/**
* @typedef {Object} AssignLibraryPluginOptions
* @property {LibraryType} type
* @property {string[] | "global"} prefix name prefix
* @property {string | false} declare declare name as variable
* @property {"error"|"static"|"copy"|"assign"} unnamed behavior for unnamed library name
* @property {"copy"|"assign"=} named behavior for named library name
*/
/**
* @typedef {Object} AssignLibraryPluginParsed
* @property {string | string[]} name
* @property {string | string[] | undefined} export
*/
/**
* @typedef {AssignLibraryPluginParsed} T
* @extends {AbstractLibraryPlugin<AssignLibraryPluginParsed>}
*/
class AssignLibraryPlugin extends AbstractLibraryPlugin {
/**
* @param {AssignLibraryPluginOptions} options the plugin options
*/
constructor(options) {
super({
pluginName: "AssignLibraryPlugin",
type: options.type
});
this.prefix = options.prefix;
this.declare = options.declare;
this.unnamed = options.unnamed;
this.named = options.named || "assign";
}
/**
* @param {LibraryOptions} library normalized library option
* @returns {T | false} preprocess as needed by overriding
*/
parseOptions(library) {
const { name } = library;
if (this.unnamed === "error") {
if (typeof name !== "string" && !Array.isArray(name)) {
throw new Error(
`Library name must be a string or string array. ${AbstractLibraryPlugin.COMMON_LIBRARY_NAME_MESSAGE}`
);
}
} else {
if (name && typeof name !== "string" && !Array.isArray(name)) {
throw new Error(
`Library name must be a string, string array or unset. ${AbstractLibraryPlugin.COMMON_LIBRARY_NAME_MESSAGE}`
);
}
}
return {
name: /** @type {string|string[]=} */ (name),
export: library.export
};
}
/**
* @param {Module} module the exporting entry module
* @param {string} entryName the name of the entrypoint
* @param {LibraryContext<T>} libraryContext context
* @returns {void}
*/
finishEntryModule(
module,
entryName,
{ options, compilation, compilation: { moduleGraph } }
) {
const runtime = getEntryRuntime(compilation, entryName);
if (options.export) {
const exportsInfo = moduleGraph.getExportInfo(
module,
Array.isArray(options.export) ? options.export[0] : options.export
);
exportsInfo.setUsed(UsageState.Used, runtime);
exportsInfo.canMangleUse = false;
} else {
const exportsInfo = moduleGraph.getExportsInfo(module);
exportsInfo.setUsedInUnknownWay(runtime);
}
moduleGraph.addExtraReason(module, "used as library export");
}
_getPrefix(compilation) {
return this.prefix === "global"
? [compilation.runtimeTemplate.globalObject]
: this.prefix;
}
_getResolvedFullName(options, chunk, compilation) {
const prefix = this._getPrefix(compilation);
const fullName = options.name ? prefix.concat(options.name) : prefix;
return fullName.map(n =>
compilation.getPath(n, {
chunk
})
);
}
/**
* @param {Source} source source
* @param {RenderContext} renderContext render context
* @param {LibraryContext<T>} libraryContext context
* @returns {Source} source with library export
*/
render(source, { chunk }, { options, compilation }) {
const fullNameResolved = this._getResolvedFullName(
options,
chunk,
compilation
);
if (this.declare) {
const base = fullNameResolved[0];
if (!isNameValid(base)) {
throw new Error(
`Library name base (${base}) must be a valid identifier when using a var declaring library type. Either use a valid identifier (e. g. ${Template.toIdentifier(
base
)}) or use a different library type (e. g. 'type: "global"', which assign a property on the global scope instead of declaring a variable). ${
AbstractLibraryPlugin.COMMON_LIBRARY_NAME_MESSAGE
}`
);
}
source = new ConcatSource(`${this.declare} ${base};\n`, source);
}
return source;
}
/**
* @param {Module} module the exporting entry module
* @param {RenderContext} renderContext render context
* @param {LibraryContext<T>} libraryContext context
* @returns {string | undefined} bailout reason
*/
embedInRuntimeBailout(
module,
{ chunk, codeGenerationResults },
{ options, compilation }
) {
const { data } = codeGenerationResults.get(module, chunk.runtime);
const topLevelDeclarations =
(data && data.get("topLevelDeclarations")) ||
(module.buildInfo && module.buildInfo.topLevelDeclarations);
if (!topLevelDeclarations)
return "it doesn't tell about top level declarations.";
const fullNameResolved = this._getResolvedFullName(
options,
chunk,
compilation
);
const base = fullNameResolved[0];
if (topLevelDeclarations.has(base))
return `it declares '${base}' on top-level, which conflicts with the current library output.`;
}
/**
* @param {RenderContext} renderContext render context
* @param {LibraryContext<T>} libraryContext context
* @returns {string | undefined} bailout reason
*/
strictRuntimeBailout({ chunk }, { options, compilation }) {
if (
this.declare ||
this.prefix === "global" ||
this.prefix.length > 0 ||
!options.name
) {
return;
}
return "a global variable is assign and maybe created";
}
/**
* @param {Source} source source
* @param {Module} module module
* @param {StartupRenderContext} renderContext render context
* @param {LibraryContext<T>} libraryContext context
* @returns {Source} source with library export
*/
renderStartup(
source,
module,
{ moduleGraph, chunk },
{ options, compilation }
) {
const fullNameResolved = this._getResolvedFullName(
options,
chunk,
compilation
);
const staticExports = this.unnamed === "static";
const exportAccess = options.export
? propertyAccess(
Array.isArray(options.export) ? options.export : [options.export]
)
: "";
const result = new ConcatSource(source);
if (staticExports) {
const exportsInfo = moduleGraph.getExportsInfo(module);
const exportTarget = accessWithInit(
fullNameResolved,
this._getPrefix(compilation).length,
true
);
for (const exportInfo of exportsInfo.orderedExports) {
if (!exportInfo.provided) continue;
const nameAccess = propertyAccess([exportInfo.name]);
result.add(
`${exportTarget}${nameAccess} = __webpack_exports__${exportAccess}${nameAccess};\n`
);
}
result.add(
`Object.defineProperty(${exportTarget}, "__esModule", { value: true });\n`
);
} else if (options.name ? this.named === "copy" : this.unnamed === "copy") {
result.add(
`var __webpack_export_target__ = ${accessWithInit(
fullNameResolved,
this._getPrefix(compilation).length,
true
)};\n`
);
let exports = "__webpack_exports__";
if (exportAccess) {
result.add(
`var __webpack_exports_export__ = __webpack_exports__${exportAccess};\n`
);
exports = "__webpack_exports_export__";
}
result.add(
`for(var i in ${exports}) __webpack_export_target__[i] = ${exports}[i];\n`
);
result.add(
`if(${exports}.__esModule) Object.defineProperty(__webpack_export_target__, "__esModule", { value: true });\n`
);
} else {
result.add(
`${accessWithInit(
fullNameResolved,
this._getPrefix(compilation).length,
false
)} = __webpack_exports__${exportAccess};\n`
);
}
return result;
}
/**
* @param {Chunk} chunk the chunk
* @param {Set<string>} set runtime requirements
* @param {LibraryContext<T>} libraryContext context
* @returns {void}
*/
runtimeRequirements(chunk, set, libraryContext) {
// we don't need to return exports from runtime
}
/**
* @param {Chunk} chunk the chunk
* @param {Hash} hash hash
* @param {ChunkHashContext} chunkHashContext chunk hash context
* @param {LibraryContext<T>} libraryContext context
* @returns {void}
*/
chunkHash(chunk, hash, chunkHashContext, { options, compilation }) {
hash.update("AssignLibraryPlugin");
const fullNameResolved = this._getResolvedFullName(
options,
chunk,
compilation
);
if (options.name ? this.named === "copy" : this.unnamed === "copy") {
hash.update("copy");
}
if (this.declare) {
hash.update(this.declare);
}
hash.update(fullNameResolved.join("."));
if (options.export) {
hash.update(`${options.export}`);
}
}
}
module.exports = AssignLibraryPlugin;