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index.js
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index.js
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const assign = require('lodash/assign')
const ConcatSource = require("webpack-sources").ConcatSource
/**
* validate plugin options
*
* @param {any} options
*/
function validateOptions(options) {
if (!options || !options.fsReadFunction) {
throw new Error(`weex-async-plugin option validate fail:
fsReadFunction is required in type \`string\` or \`function\``)
}
}
/**
* init plugin instance
*
* @param {any} options
*/
function Instance(options) {
validateOptions(options)
if (typeof options.fsReadFunction === 'function') {
options.fsReadFunction = options.fsReadFunction.toString()
}
this.options = assign({
fsReadFunction: null,
publicPath: null
}, options || {})
}
Instance.prototype.apply = function apply(compiler) {
const options = this.options
compiler.plugin('compilation', function (compilation) {
// inject fs read function
compilation.mainTemplate.plugin("local-vars", function (source, chunk) {
if (chunk.chunks.length > 0) {
return this.asString([
source,
"",
"// objects to store loaded and loading chunks",
"var installedChunks = {",
this.indent(
chunk.ids.map(id => `${JSON.stringify(id)}: 0`).join(",\n")
),
"};",
"var weexFsRead = " + options.fsReadFunction + ";",
""
]);
}
return source;
})
// add weex weexJsonpContext
compilation.mainTemplate.plugin("bootstrap", function (source, chunk, hash) {
if (chunk.chunks.length > 0) {
var jsonpFunction = this.outputOptions.jsonpFunction;
return this.asString([
"",
"// install a JSONP callback for chunk loading",
"var isWeex = typeof weex !== 'undefined' && weex.config.env.platform !== 'Web'",
"var isHttp = typeof weex !== 'undefined' && (weex.config.bundleUrl.indexOf('http') === 0)",
"var weexJsonpContext = {};",
"if(isWeex) { weexJsonpContext.weex = weex }",
"var context = isWeex ? weexJsonpContext : window;",
`var parentJsonpFunction = context[${JSON.stringify(jsonpFunction)}];`,
`context[${JSON.stringify(jsonpFunction)}] = function webpackJsonpCallback(chunkIds, moreModules, executeModules) {`,
this.indent([
"// add \"moreModules\" to the modules object,",
"// then flag all \"chunkIds\" as loaded and fire callback",
"var moduleId, chunkId, i = 0, resolves = [], result;",
"for(;i < chunkIds.length; i++) {",
this.indent([
"chunkId = chunkIds[i];",
"if(installedChunks[chunkId]) {",
this.indent("resolves.push(installedChunks[chunkId][0]);"),
"}",
"installedChunks[chunkId] = 0;"
]),
"}",
"for(moduleId in moreModules) {",
this.indent([
"if(Object.prototype.hasOwnProperty.call(moreModules, moduleId)) {",
this.indent(this.renderAddModule(hash, chunk, "moduleId", "moreModules[moduleId]")),
"}"
]),
"}",
"if(parentJsonpFunction) parentJsonpFunction(chunkIds, moreModules, executeModules);",
"while(resolves.length) {",
this.indent("resolves.shift()();"),
"}",
this.entryPointInChildren(chunk) ? [
"if(executeModules) {",
this.indent([
"for(i=0; i < executeModules.length; i++) {",
this.indent(`result = ${this.requireFn}(${this.requireFn}.s = executeModules[i]);`),
"}"
]),
"}",
"return result;",
] : ""
]),
"};"
]);
}
return source;
})
// move header && header.append to jsonp-script
compilation.mainTemplate.plugin("require-ensure", function (_, chunk, hash) {
return this.asString([
"var installedChunkData = installedChunks[chunkId];",
"if(installedChunkData === 0) {",
this.indent([
"return new Promise(function(resolve) { resolve(); });"
]),
"}",
"",
"// a Promise means \"currently loading\".",
"if(installedChunkData) {",
this.indent([
"return installedChunkData[2];"
]),
"}",
"",
"// setup Promise in chunk cache",
"var promise = new Promise(function(resolve, reject) {",
this.indent([
"installedChunkData = installedChunks[chunkId] = [resolve, reject];"
]),
"});",
"installedChunkData[2] = promise;",
"",
"// start chunk loading",
this.applyPluginsWaterfall("jsonp-script", "", chunk, hash),
"return promise;"
]);
})
compilation.mainTemplate.plugin('jsonp-script', function (_, chunk, hash) {
const chunkFilename = this.outputOptions.chunkFilename;
const chunkMaps = chunk.getChunkMaps();
const crossOriginLoading = this.outputOptions.crossOriginLoading;
const chunkLoadTimeout = this.outputOptions.chunkLoadTimeout;
const scriptSrcPath = this.applyPluginsWaterfall("asset-path", JSON.stringify(chunkFilename), {
hash: `" + ${this.renderCurrentHashCode(hash)} + "`,
hashWithLength: length => `" + ${this.renderCurrentHashCode(hash, length)} + "`,
chunk: {
id: "\" + chunkId + \"",
hash: `" + ${JSON.stringify(chunkMaps.hash)}[chunkId] + "`,
hashWithLength(length) {
const shortChunkHashMap = Object.create(null);
Object.keys(chunkMaps.hash).forEach(chunkId => {
if (typeof chunkMaps.hash[chunkId] === "string")
shortChunkHashMap[chunkId] = chunkMaps.hash[chunkId].substr(0, length);
});
return `" + ${JSON.stringify(shortChunkHashMap)}[chunkId] + "`;
},
name: `" + (${JSON.stringify(chunkMaps.name)}[chunkId]||chunkId) + "`
}
});
const weexBasePath = options.publicPath ? `"${options.publicPath}"` : `${this.requireFn}.p`
return this.asString([
"if (isWeex) {",
this.indent([
"if (isHttp) {",
this.indent([
`fetch(${weexBasePath} + ${scriptSrcPath})`,
this.indent([
`.then(function(resp){`,
this.indent([
`if(resp.ok) {`,
this.indent([
`return resp.text()`
]),
`}`]),
this.indent([
`throw new Error('Loading chunk ' + chunkId + ' failed.')`
]),
`})`,
`.then(function(jsContent){`,
this.indent([
`new Function(jsContent).call(context);`,
"var chunk = installedChunks[chunkId];",
"if(chunk !== 0) {",
this.indent([
"if(chunk) {",
this.indent(
"chunk[1](new Error('Loading chunk ' + chunkId + ' failed.'));"
),
"}",
"installedChunks[chunkId] = undefined;"
]),
`}`
]),
"})"
]),
]),
"} else { ",
this.indent([
`weexFsRead(${weexBasePath} + ${scriptSrcPath})`,
this.indent([
`.then(function(jsContent){`,
`new Function(jsContent).call(context);`,
"var chunk = installedChunks[chunkId];",
"if(chunk !== 0) {",
this.indent([
"if(chunk) {",
this.indent("chunk[1](new Error('Loading chunk ' + chunkId + ' failed.'));"),
"}",
"installedChunks[chunkId] = undefined;"
]),
`}`
]),
"})"
]),
"}",
]),
"} else {",
this.indent([
"var head = document.getElementsByTagName('head')[0];",
"var script = document.createElement('script');",
"script.type = 'text/javascript';",
"script.charset = 'utf-8';",
"script.async = true;",
`script.timeout = ${chunkLoadTimeout};`,
crossOriginLoading ? `script.crossOrigin = ${JSON.stringify(crossOriginLoading)};` : "",
`if (${this.requireFn}.nc) {`,
this.indent(`script.setAttribute("nonce", ${this.requireFn}.nc);`),
"}",
`script.src = ${this.requireFn}.p + ${scriptSrcPath};`,
`var timeout = setTimeout(onScriptComplete, ${chunkLoadTimeout});`,
"script.onerror = script.onload = onScriptComplete;",
"function onScriptComplete() {",
this.indent([
"// avoid mem leaks in IE.",
"script.onerror = script.onload = null;",
"clearTimeout(timeout);",
"var chunk = installedChunks[chunkId];",
"if(chunk !== 0) {",
this.indent([
"if(chunk) {",
this.indent("chunk[1](new Error('Loading chunk ' + chunkId + ' failed.'));"),
"}",
"installedChunks[chunkId] = undefined;"
]),
"}"
]),
"};",
"head.appendChild(script);",
"",
]),
"}"
]);
})
compilation.chunkTemplate.plugin("render", function(modules, chunk) {
const jsonpFunction = this.outputOptions.jsonpFunction;
const source = new ConcatSource();
source.add(`${jsonpFunction} = this.${jsonpFunction};weex = this.weex;`);
source.add(`${jsonpFunction}(${JSON.stringify(chunk.ids)},`);
source.add(modules);
const entries = [chunk.entryModule].filter(Boolean).map(m => m.id);
if(entries.length > 0) {
source.add(`,${JSON.stringify(entries)}`);
}
source.add(")");
return source;
});
})
}
module.exports = Instance