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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const RuntimeGlobals = require("../RuntimeGlobals");
const RuntimeModule = require("../RuntimeModule");
const Template = require("../Template");
const {
compareModulesByIdentifier,
compareStrings
} = require("../util/comparators");
class ShareRuntimeModule extends RuntimeModule {
constructor() {
super("sharing");
}
/**
* @returns {string} runtime code
*/
generate() {
const { compilation, chunkGraph } = this;
const {
runtimeTemplate,
codeGenerationResults,
outputOptions: { uniqueName }
} = compilation;
/** @type {Map<string, Map<number, Set<string>>>} */
const initCodePerScope = new Map();
for (const chunk of this.chunk.getAllReferencedChunks()) {
const modules = chunkGraph.getOrderedChunkModulesIterableBySourceType(
chunk,
"share-init",
compareModulesByIdentifier
);
if (!modules) continue;
for (const m of modules) {
const data = codeGenerationResults.getData(
m,
chunk.runtime,
"share-init"
);
if (!data) continue;
for (const item of data) {
const { shareScope, initStage, init } = item;
let stages = initCodePerScope.get(shareScope);
if (stages === undefined) {
initCodePerScope.set(shareScope, (stages = new Map()));
}
let list = stages.get(initStage || 0);
if (list === undefined) {
stages.set(initStage || 0, (list = new Set()));
}
list.add(init);
}
}
}
return Template.asString([
`${RuntimeGlobals.shareScopeMap} = {};`,
"var initPromises = {};",
"var initTokens = {};",
`${RuntimeGlobals.initializeSharing} = ${runtimeTemplate.basicFunction(
"name, initScope",
[
"if(!initScope) initScope = [];",
"// handling circular init calls",
"var initToken = initTokens[name];",
"if(!initToken) initToken = initTokens[name] = {};",
"if(initScope.indexOf(initToken) >= 0) return;",
"initScope.push(initToken);",
"// only runs once",
"if(initPromises[name]) return initPromises[name];",
"// creates a new share scope if needed",
`if(!${RuntimeGlobals.hasOwnProperty}(${RuntimeGlobals.shareScopeMap}, name)) ${RuntimeGlobals.shareScopeMap}[name] = {};`,
"// runs all init snippets from all modules reachable",
`var scope = ${RuntimeGlobals.shareScopeMap}[name];`,
`var warn = ${runtimeTemplate.returningFunction(
'typeof console !== "undefined" && console.warn && console.warn(msg)',
"msg"
)};`,
`var uniqueName = ${JSON.stringify(uniqueName || undefined)};`,
`var register = ${runtimeTemplate.basicFunction(
"name, version, factory, eager",
[
"var versions = scope[name] = scope[name] || {};",
"var activeVersion = versions[version];",
"if(!activeVersion || (!activeVersion.loaded && (!eager != !activeVersion.eager ? eager : uniqueName > activeVersion.from))) versions[version] = { get: factory, from: uniqueName, eager: !!eager };"
]
)};`,
`var initExternal = ${runtimeTemplate.basicFunction("id", [
`var handleError = ${runtimeTemplate.expressionFunction(
'warn("Initialization of sharing external failed: " + err)',
"err"
)};`,
"try {",
Template.indent([
"var module = __webpack_require__(id);",
"if(!module) return;",
`var initFn = ${runtimeTemplate.returningFunction(
`module && module.init && module.init(${RuntimeGlobals.shareScopeMap}[name], initScope)`,
"module"
)}`,
"if(module.then) return promises.push(module.then(initFn, handleError));",
"var initResult = initFn(module);",
"if(initResult && initResult.then) return promises.push(initResult.catch(handleError));"
]),
"} catch(err) { handleError(err); }"
])}`,
"var promises = [];",
"switch(name) {",
...Array.from(initCodePerScope)
.sort(([a], [b]) => compareStrings(a, b))
.map(([name, stages]) =>
Template.indent([
`case ${JSON.stringify(name)}: {`,
Template.indent(
Array.from(stages)
.sort(([a], [b]) => a - b)
.map(([, initCode]) =>
Template.asString(Array.from(initCode))
)
),
"}",
"break;"
])
),
"}",
"if(!promises.length) return initPromises[name] = 1;",
`return initPromises[name] = Promise.all(promises).then(${runtimeTemplate.returningFunction(
"initPromises[name] = 1"
)});`
]
)};`
]);
}
}
module.exports = ShareRuntimeModule;