有没有办法让PhantomJS原生支持ES6,我有一堆ES6代码,通过Babel转换为ES5,我需要完成的是准确测量代码覆盖率,这是针对ES6代码而不是ES5完成的。这是客户的要求,所以我不能只是告诉他停止请求这样的事情......
Afaik NodeJS 已经原生支持 ES6,有没有办法用 PhantomJS 来实现这一点?
最佳答案
我最终使用了原始 NodeJS(没有 PhantomJs)+ Express + JSDom( https://github.com/tmpvar/jsdom ),POC 如下所示:
"use strict"
const $module = require('module');
const path = require('path');
const babel = require("babel-core");
const Jasmine = require('jasmine');
const reporters = require('jasmine-reporters');
const express = require('express');
const jsdom = require("jsdom");
const app = express();
const vm = require('vm');
const fs = require("fs");
app.get('/', function (req, res) {
res.sendFile('index.html', { root: __dirname });
});
app.use('/bower_components', express.static('bower_components'));
const load = function (filename) {
return fs.readFileSync(`./bower_components/${filename}`, "utf-8");
};
const packages = [
fs.readFileSync('./bower_components/jquery/dist/jquery.js', "utf-8"),
fs.readFileSync('./bower_components/angular/angular.js', "utf-8"),
fs.readFileSync('./bower_components/angular-mocks/angular-mocks.js', "utf-8")
];
const sut = {
'./js/code.js': fs.readFileSync('./js/code.js', "utf-8")
};
const tests = {
'./tests/test.js': fs.readFileSync('./tests/test.js', "utf-8")
};
function navigate(FakeFileSystem, root, cwd, filename) {
// Normalize path according to root
let relative = path.relative(root, path.resolve(root, cwd, filename));
let parts = relative.split(path.sep);
let iterator = FakeFileSystem;
for (let part of parts) {
iterator = iterator[part] || (iterator[part] = { });
}
return iterator;
}
const server = app.listen(3333, function () {
const host = server.address().address;
const port = server.address().port;
const url = `http://${host === '::' ? 'localhost' : host}:${port}`;
console.log(`Server launched at ${ url }`);
console.log(`Running tests...`)
jsdom.env({
url: url,
src: packages,
done: function (err, window) {
let jasmine = new Jasmine();
let FakeFileSystem = {};
let descriptors = [];
jasmine.configureDefaultReporter({ showColors: true });
let env = jasmine.env;
for (let propertyName in env) {
if (env.hasOwnProperty(propertyName)) {
window[propertyName] = env[propertyName];
}
}
let context = vm.createContext(window);
let collections = [sut, tests];
for (let collection of collections) {
for (let filename in collection) {
let descriptor = navigate(FakeFileSystem, __dirname, '.', filename);
let source = collection[filename];
let transpiled = babel.transform(source, { "plugins": ["transform-es2015-modules-commonjs"] });
let code = $module.wrap(transpiled.code);
let _exports = {};
let _module = { exports: _exports };
descriptor.code = vm.runInContext(code, context);
descriptor.module = _module;
descriptor.exports = _exports;
descriptor.filename = filename;
descriptors.push(descriptor);
}
}
for (let descriptor of descriptors) {
let cwd = path.dirname(path.relative(__dirname, descriptor.filename));
descriptor.code.call(
undefined,
descriptor.exports,
// Closure is used to capture cwd
(function (cwd) {
return function (filename) { // Fake require function
return navigate(FakeFileSystem, __dirname, cwd, filename).exports;
}
})(cwd),
descriptor.module,
descriptor.filename
);
}
jasmine.execute();
server.close();
}
});
});
这种方法的优点在于,不需要使用 babel 转译代码,它允许从 Bower 加载 Angular 等前端包,而所有配置内容都来自 npm...
编辑
我偶然发现 NodeJS 还不支持所有 ES6 功能,而像 ES6 模块这样的功能真的很痛苦,它们在任何地方都不受支持,所以我最终对使用 babel 编写代码,期望随着 NodeJS 开始为 ES6 提供越来越丰富的支持,我最终将逐步关闭 babel 功能,并在可用时切换到原生支持...
关于phantomjs - PhantomJS 对 ES6 的原生支持,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/33261807/