vue hello world项目
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/*
MIT License http://www.opensource.org/licenses/mit-license.php
*/
"use strict";
const RuntimeGlobals = require("../RuntimeGlobals");
const Template = require("../Template");
const HelperRuntimeModule = require("./HelperRuntimeModule");
class AsyncModuleRuntimeModule extends HelperRuntimeModule {
constructor() {
super("async module");
}
/**
* @returns {string} runtime code
*/
generate() {
const { runtimeTemplate } = this.compilation;
const fn = RuntimeGlobals.asyncModule;
return Template.asString([
'var webpackThen = typeof Symbol === "function" ? Symbol("webpack then") : "__webpack_then__";',
'var webpackExports = typeof Symbol === "function" ? Symbol("webpack exports") : "__webpack_exports__";',
'var webpackError = typeof Symbol === "function" ? Symbol("webpack error") : "__webpack_error__";',
`var completeQueue = ${runtimeTemplate.basicFunction("queue", [
"if(queue) {",
Template.indent([
`queue.forEach(${runtimeTemplate.expressionFunction(
"fn.r--",
"fn"
)});`,
`queue.forEach(${runtimeTemplate.expressionFunction(
"fn.r-- ? fn.r++ : fn()",
"fn"
)});`
]),
"}"
])}`,
`var completeFunction = ${runtimeTemplate.expressionFunction(
"!--fn.r && fn()",
"fn"
)};`,
`var queueFunction = ${runtimeTemplate.expressionFunction(
"queue ? queue.push(fn) : completeFunction(fn)",
"queue, fn"
)};`,
`var wrapDeps = ${runtimeTemplate.returningFunction(
`deps.map(${runtimeTemplate.basicFunction("dep", [
'if(dep !== null && typeof dep === "object") {',
Template.indent([
"if(dep[webpackThen]) return dep;",
"if(dep.then) {",
Template.indent([
"var queue = [];",
`dep.then(${runtimeTemplate.basicFunction("r", [
"obj[webpackExports] = r;",
"completeQueue(queue);",
"queue = 0;"
])}, ${runtimeTemplate.basicFunction("e", [
"obj[webpackError] = e;",
"completeQueue(queue);",
"queue = 0;"
])});`,
"var obj = {};",
`obj[webpackThen] = ${runtimeTemplate.expressionFunction(
"queueFunction(queue, fn), dep['catch'](reject)",
"fn, reject"
)};`,
"return obj;"
]),
"}"
]),
"}",
"var ret = {};",
`ret[webpackThen] = ${runtimeTemplate.expressionFunction(
"completeFunction(fn)",
"fn"
)};`,
"ret[webpackExports] = dep;",
"return ret;"
])})`,
"deps"
)};`,
`${fn} = ${runtimeTemplate.basicFunction("module, body, hasAwait", [
"var queue = hasAwait && [];",
"var exports = module.exports;",
"var currentDeps;",
"var outerResolve;",
"var reject;",
"var isEvaluating = true;",
"var nested = false;",
`var whenAll = ${runtimeTemplate.basicFunction(
"deps, onResolve, onReject",
[
"if (nested) return;",
"nested = true;",
"onResolve.r += deps.length;",
`deps.map(${runtimeTemplate.expressionFunction(
"dep[webpackThen](onResolve, onReject)",
"dep, i"
)});`,
"nested = false;"
]
)};`,
`var promise = new Promise(${runtimeTemplate.basicFunction(
"resolve, rej",
[
"reject = rej;",
`outerResolve = ${runtimeTemplate.expressionFunction(
"resolve(exports), completeQueue(queue), queue = 0"
)};`
]
)});`,
"promise[webpackExports] = exports;",
`promise[webpackThen] = ${runtimeTemplate.basicFunction(
"fn, rejectFn",
[
"if (isEvaluating) { return completeFunction(fn); }",
"if (currentDeps) whenAll(currentDeps, fn, rejectFn);",
"queueFunction(queue, fn);",
"promise['catch'](rejectFn);"
]
)};`,
"module.exports = promise;",
`body(${runtimeTemplate.basicFunction("deps", [
"currentDeps = wrapDeps(deps);",
"var fn;",
`var getResult = ${runtimeTemplate.returningFunction(
`currentDeps.map(${runtimeTemplate.basicFunction("d", [
"if(d[webpackError]) throw d[webpackError];",
"return d[webpackExports];"
])})`
)}`,
`var promise = new Promise(${runtimeTemplate.basicFunction(
"resolve, reject",
[
`fn = ${runtimeTemplate.expressionFunction(
"resolve(getResult)"
)};`,
"fn.r = 0;",
"whenAll(currentDeps, fn, reject);"
]
)});`,
"return fn.r ? promise : getResult();"
])}, ${runtimeTemplate.expressionFunction(
"err && reject(promise[webpackError] = err), outerResolve()",
"err"
)});`,
"isEvaluating = false;"
])};`
]);
}
}
module.exports = AsyncModuleRuntimeModule;