vue hello world项目
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/*
MIT License http://www.opensource.org/licenses/mit-license.php
*/
"use strict";
const { SyncWaterfallHook } = require("tapable");
const Compilation = require("../Compilation");
const RuntimeGlobals = require("../RuntimeGlobals");
const RuntimeModule = require("../RuntimeModule");
const Template = require("../Template");
const {
getChunkFilenameTemplate,
chunkHasJs
} = require("../javascript/JavascriptModulesPlugin");
const { getInitialChunkIds } = require("../javascript/StartupHelpers");
const compileBooleanMatcher = require("../util/compileBooleanMatcher");
const { getUndoPath } = require("../util/identifier");
/** @typedef {import("../Chunk")} Chunk */
/**
* @typedef {Object} JsonpCompilationPluginHooks
* @property {SyncWaterfallHook<[string, Chunk]>} linkPreload
* @property {SyncWaterfallHook<[string, Chunk]>} linkPrefetch
*/
/** @type {WeakMap<Compilation, JsonpCompilationPluginHooks>} */
const compilationHooksMap = new WeakMap();
class ModuleChunkLoadingRuntimeModule extends RuntimeModule {
/**
* @param {Compilation} compilation the compilation
* @returns {JsonpCompilationPluginHooks} hooks
*/
static getCompilationHooks(compilation) {
if (!(compilation instanceof Compilation)) {
throw new TypeError(
"The 'compilation' argument must be an instance of Compilation"
);
}
let hooks = compilationHooksMap.get(compilation);
if (hooks === undefined) {
hooks = {
linkPreload: new SyncWaterfallHook(["source", "chunk"]),
linkPrefetch: new SyncWaterfallHook(["source", "chunk"])
};
compilationHooksMap.set(compilation, hooks);
}
return hooks;
}
constructor(runtimeRequirements) {
super("import chunk loading", RuntimeModule.STAGE_ATTACH);
this._runtimeRequirements = runtimeRequirements;
}
/**
* @private
* @param {Chunk} chunk chunk
* @param {string} rootOutputDir root output directory
* @returns {string} generated code
*/
_generateBaseUri(chunk, rootOutputDir) {
const options = chunk.getEntryOptions();
if (options && options.baseUri) {
return `${RuntimeGlobals.baseURI} = ${JSON.stringify(options.baseUri)};`;
}
const {
compilation: {
outputOptions: { importMetaName }
}
} = this;
return `${RuntimeGlobals.baseURI} = new URL(${JSON.stringify(
rootOutputDir
)}, ${importMetaName}.url);`;
}
/**
* @returns {string} runtime code
*/
generate() {
const { compilation, chunk, chunkGraph } = this;
const {
runtimeTemplate,
outputOptions: { importFunctionName }
} = compilation;
const fn = RuntimeGlobals.ensureChunkHandlers;
const withBaseURI = this._runtimeRequirements.has(RuntimeGlobals.baseURI);
const withExternalInstallChunk = this._runtimeRequirements.has(
RuntimeGlobals.externalInstallChunk
);
const withLoading = this._runtimeRequirements.has(
RuntimeGlobals.ensureChunkHandlers
);
const withOnChunkLoad = this._runtimeRequirements.has(
RuntimeGlobals.onChunksLoaded
);
const withHmr = this._runtimeRequirements.has(
RuntimeGlobals.hmrDownloadUpdateHandlers
);
const conditionMap = chunkGraph.getChunkConditionMap(chunk, chunkHasJs);
const hasJsMatcher = compileBooleanMatcher(conditionMap);
const initialChunkIds = getInitialChunkIds(chunk, chunkGraph, chunkHasJs);
const outputName = this.compilation.getPath(
getChunkFilenameTemplate(chunk, this.compilation.outputOptions),
{
chunk,
contentHashType: "javascript"
}
);
const rootOutputDir = getUndoPath(
outputName,
this.compilation.outputOptions.path,
true
);
const stateExpression = withHmr
? `${RuntimeGlobals.hmrRuntimeStatePrefix}_module`
: undefined;
return Template.asString([
withBaseURI
? this._generateBaseUri(chunk, rootOutputDir)
: "// no baseURI",
"",
"// object to store loaded and loading chunks",
"// undefined = chunk not loaded, null = chunk preloaded/prefetched",
"// [resolve, reject, Promise] = chunk loading, 0 = chunk loaded",
`var installedChunks = ${
stateExpression ? `${stateExpression} = ${stateExpression} || ` : ""
}{`,
Template.indent(
Array.from(initialChunkIds, id => `${JSON.stringify(id)}: 0`).join(
",\n"
)
),
"};",
"",
withLoading || withExternalInstallChunk
? `var installChunk = ${runtimeTemplate.basicFunction("data", [
runtimeTemplate.destructureObject(
["ids", "modules", "runtime"],
"data"
),
'// add "modules" to the modules object,',
'// then flag all "ids" as loaded and fire callback',
"var moduleId, chunkId, i = 0;",
"for(moduleId in modules) {",
Template.indent([
`if(${RuntimeGlobals.hasOwnProperty}(modules, moduleId)) {`,
Template.indent(
`${RuntimeGlobals.moduleFactories}[moduleId] = modules[moduleId];`
),
"}"
]),
"}",
"if(runtime) runtime(__webpack_require__);",
"for(;i < ids.length; i++) {",
Template.indent([
"chunkId = ids[i];",
`if(${RuntimeGlobals.hasOwnProperty}(installedChunks, chunkId) && installedChunks[chunkId]) {`,
Template.indent("installedChunks[chunkId][0]();"),
"}",
"installedChunks[ids[i]] = 0;"
]),
"}",
withOnChunkLoad ? `${RuntimeGlobals.onChunksLoaded}();` : ""
])}`
: "// no install chunk",
"",
withLoading
? Template.asString([
`${fn}.j = ${runtimeTemplate.basicFunction(
"chunkId, promises",
hasJsMatcher !== false
? Template.indent([
"// import() chunk loading for javascript",
`var installedChunkData = ${RuntimeGlobals.hasOwnProperty}(installedChunks, chunkId) ? installedChunks[chunkId] : undefined;`,
'if(installedChunkData !== 0) { // 0 means "already installed".',
Template.indent([
"",
'// a Promise means "currently loading".',
"if(installedChunkData) {",
Template.indent([
"promises.push(installedChunkData[1]);"
]),
"} else {",
Template.indent([
hasJsMatcher === true
? "if(true) { // all chunks have JS"
: `if(${hasJsMatcher("chunkId")}) {`,
Template.indent([
"// setup Promise in chunk cache",
`var promise = ${importFunctionName}(${JSON.stringify(
rootOutputDir
)} + ${
RuntimeGlobals.getChunkScriptFilename
}(chunkId)).then(installChunk, ${runtimeTemplate.basicFunction(
"e",
[
"if(installedChunks[chunkId] !== 0) installedChunks[chunkId] = undefined;",
"throw e;"
]
)});`,
`var promise = Promise.race([promise, new Promise(${runtimeTemplate.expressionFunction(
`installedChunkData = installedChunks[chunkId] = [resolve]`,
"resolve"
)})])`,
`promises.push(installedChunkData[1] = promise);`
]),
"} else installedChunks[chunkId] = 0;"
]),
"}"
]),
"}"
])
: Template.indent(["installedChunks[chunkId] = 0;"])
)};`
])
: "// no chunk on demand loading",
"",
withExternalInstallChunk
? Template.asString([
`${RuntimeGlobals.externalInstallChunk} = installChunk;`
])
: "// no external install chunk",
"",
withOnChunkLoad
? `${
RuntimeGlobals.onChunksLoaded
}.j = ${runtimeTemplate.returningFunction(
"installedChunks[chunkId] === 0",
"chunkId"
)};`
: "// no on chunks loaded"
]);
}
}
module.exports = ModuleChunkLoadingRuntimeModule;