webpack
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Packs CommonJs/AMD modules for the browser. Allows to split your codebase into multiple bundles, which can be loaded on demand. Support loaders to preprocess files, i.e. json, jsx, es7, css, less, ... and your custom stuff.
277 lines (268 loc) • 9.38 kB
JavaScript
/*
MIT License http://www.opensource.org/licenses/mit-license.php
*/
;
const RuntimeGlobals = require("../RuntimeGlobals");
const RuntimeModule = require("../RuntimeModule");
const Template = require("../Template");
const {
chunkHasJs,
getChunkFilenameTemplate
} = require("../javascript/JavascriptModulesPlugin");
const { getInitialChunkIds } = require("../javascript/StartupHelpers");
const compileBooleanMatcher = require("../util/compileBooleanMatcher");
const { getUndoPath } = require("../util/identifier");
class ReadFileChunkLoadingRuntimeModule extends RuntimeModule {
constructor(runtimeRequirements) {
super("readFile chunk loading", RuntimeModule.STAGE_ATTACH);
this.runtimeRequirements = runtimeRequirements;
}
/**
* @returns {string} runtime code
*/
generate() {
const { chunkGraph, chunk } = this;
const { runtimeTemplate } = this.compilation;
const fn = RuntimeGlobals.ensureChunkHandlers;
const withBaseURI = this.runtimeRequirements.has(RuntimeGlobals.baseURI);
const withExternalInstallChunk = this.runtimeRequirements.has(
RuntimeGlobals.externalInstallChunk
);
const withOnChunkLoad = this.runtimeRequirements.has(
RuntimeGlobals.onChunksLoaded
);
const withLoading = this.runtimeRequirements.has(
RuntimeGlobals.ensureChunkHandlers
);
const withHmr = this.runtimeRequirements.has(
RuntimeGlobals.hmrDownloadUpdateHandlers
);
const withHmrManifest = this.runtimeRequirements.has(
RuntimeGlobals.hmrDownloadManifest
);
const conditionMap = chunkGraph.getChunkConditionMap(chunk, chunkHasJs);
const hasJsMatcher = compileBooleanMatcher(conditionMap);
const initialChunkIds = getInitialChunkIds(chunk, chunkGraph);
const outputName = this.compilation.getPath(
getChunkFilenameTemplate(chunk, this.compilation.outputOptions),
{
chunk,
contentHashType: "javascript"
}
);
const rootOutputDir = getUndoPath(
outputName,
this.compilation.outputOptions.path,
false
);
const stateExpression = withHmr
? `${RuntimeGlobals.hmrRuntimeStatePrefix}_readFileVm`
: undefined;
return Template.asString([
withBaseURI
? Template.asString([
`${RuntimeGlobals.baseURI} = require("url").pathToFileURL(${
rootOutputDir
? `__dirname + ${JSON.stringify("/" + rootOutputDir)}`
: "__filename"
});`
])
: "// no baseURI",
"",
"// object to store loaded chunks",
'// "0" means "already loaded", Promise means loading',
`var installedChunks = ${
stateExpression ? `${stateExpression} = ${stateExpression} || ` : ""
}{`,
Template.indent(
Array.from(initialChunkIds, id => `${JSON.stringify(id)}: 0`).join(
",\n"
)
),
"};",
"",
withOnChunkLoad
? `${
RuntimeGlobals.onChunksLoaded
}.readFileVm = ${runtimeTemplate.returningFunction(
"installedChunks[chunkId] === 0",
"chunkId"
)};`
: "// no on chunks loaded",
"",
withLoading || withExternalInstallChunk
? `var installChunk = ${runtimeTemplate.basicFunction("chunk", [
"var moreModules = chunk.modules, chunkIds = chunk.ids, runtime = chunk.runtime;",
"for(var moduleId in moreModules) {",
Template.indent([
`if(${RuntimeGlobals.hasOwnProperty}(moreModules, moduleId)) {`,
Template.indent([
`${RuntimeGlobals.moduleFactories}[moduleId] = moreModules[moduleId];`
]),
"}"
]),
"}",
`if(runtime) runtime(__webpack_require__);`,
"for(var i = 0; i < chunkIds.length; i++) {",
Template.indent([
"if(installedChunks[chunkIds[i]]) {",
Template.indent(["installedChunks[chunkIds[i]][0]();"]),
"}",
"installedChunks[chunkIds[i]] = 0;"
]),
"}",
withOnChunkLoad ? `${RuntimeGlobals.onChunksLoaded}();` : ""
])};`
: "// no chunk install function needed",
"",
withLoading
? Template.asString([
"// ReadFile + VM.run chunk loading for javascript",
`${fn}.readFileVm = function(chunkId, promises) {`,
hasJsMatcher !== false
? Template.indent([
"",
"var installedChunkData = installedChunks[chunkId];",
'if(installedChunkData !== 0) { // 0 means "already installed".',
Template.indent([
'// array of [resolve, reject, promise] means "currently loading"',
"if(installedChunkData) {",
Template.indent(["promises.push(installedChunkData[2]);"]),
"} else {",
Template.indent([
hasJsMatcher === true
? "if(true) { // all chunks have JS"
: `if(${hasJsMatcher("chunkId")}) {`,
Template.indent([
"// load the chunk and return promise to it",
"var promise = new Promise(function(resolve, reject) {",
Template.indent([
"installedChunkData = installedChunks[chunkId] = [resolve, reject];",
`var filename = require('path').join(__dirname, ${JSON.stringify(
rootOutputDir
)} + ${
RuntimeGlobals.getChunkScriptFilename
}(chunkId));`,
"require('fs').readFile(filename, 'utf-8', function(err, content) {",
Template.indent([
"if(err) return reject(err);",
"var chunk = {};",
"require('vm').runInThisContext('(function(exports, require, __dirname, __filename) {' + content + '\\n})', filename)" +
"(chunk, require, require('path').dirname(filename), filename);",
"installChunk(chunk);"
]),
"});"
]),
"});",
"promises.push(installedChunkData[2] = promise);"
]),
"} else installedChunks[chunkId] = 0;"
]),
"}"
]),
"}"
])
: Template.indent(["installedChunks[chunkId] = 0;"]),
"};"
])
: "// no chunk loading",
"",
withExternalInstallChunk
? Template.asString([
"module.exports = __webpack_require__;",
`${RuntimeGlobals.externalInstallChunk} = installChunk;`
])
: "// no external install chunk",
"",
withHmr
? Template.asString([
"function loadUpdateChunk(chunkId, updatedModulesList) {",
Template.indent([
"return new Promise(function(resolve, reject) {",
Template.indent([
`var filename = require('path').join(__dirname, ${JSON.stringify(
rootOutputDir
)} + ${RuntimeGlobals.getChunkUpdateScriptFilename}(chunkId));`,
"require('fs').readFile(filename, 'utf-8', function(err, content) {",
Template.indent([
"if(err) return reject(err);",
"var update = {};",
"require('vm').runInThisContext('(function(exports, require, __dirname, __filename) {' + content + '\\n})', filename)" +
"(update, require, require('path').dirname(filename), filename);",
"var updatedModules = update.modules;",
"var runtime = update.runtime;",
"for(var moduleId in updatedModules) {",
Template.indent([
`if(${RuntimeGlobals.hasOwnProperty}(updatedModules, moduleId)) {`,
Template.indent([
`currentUpdate[moduleId] = updatedModules[moduleId];`,
"if(updatedModulesList) updatedModulesList.push(moduleId);"
]),
"}"
]),
"}",
"if(runtime) currentUpdateRuntime.push(runtime);",
"resolve();"
]),
"});"
]),
"});"
]),
"}",
"",
Template.getFunctionContent(
require("../hmr/JavascriptHotModuleReplacement.runtime.js")
)
.replace(/\$key\$/g, "readFileVm")
.replace(/\$installedChunks\$/g, "installedChunks")
.replace(/\$loadUpdateChunk\$/g, "loadUpdateChunk")
.replace(/\$moduleCache\$/g, RuntimeGlobals.moduleCache)
.replace(/\$moduleFactories\$/g, RuntimeGlobals.moduleFactories)
.replace(
/\$ensureChunkHandlers\$/g,
RuntimeGlobals.ensureChunkHandlers
)
.replace(/\$hasOwnProperty\$/g, RuntimeGlobals.hasOwnProperty)
.replace(/\$hmrModuleData\$/g, RuntimeGlobals.hmrModuleData)
.replace(
/\$hmrDownloadUpdateHandlers\$/g,
RuntimeGlobals.hmrDownloadUpdateHandlers
)
.replace(
/\$hmrInvalidateModuleHandlers\$/g,
RuntimeGlobals.hmrInvalidateModuleHandlers
)
])
: "// no HMR",
"",
withHmrManifest
? Template.asString([
`${RuntimeGlobals.hmrDownloadManifest} = function() {`,
Template.indent([
"return new Promise(function(resolve, reject) {",
Template.indent([
`var filename = require('path').join(__dirname, ${JSON.stringify(
rootOutputDir
)} + ${RuntimeGlobals.getUpdateManifestFilename}());`,
"require('fs').readFile(filename, 'utf-8', function(err, content) {",
Template.indent([
"if(err) {",
Template.indent([
'if(err.code === "ENOENT") return resolve();',
"return reject(err);"
]),
"}",
"try { resolve(JSON.parse(content)); }",
"catch(e) { reject(e); }"
]),
"});"
]),
"});"
]),
"}"
])
: "// no HMR manifest"
]);
}
}
module.exports = ReadFileChunkLoadingRuntimeModule;