【发布时间】:2020-04-03 21:34:10
【问题描述】:
我试图阻止@babel/preset-env + @babel/plugin-transform-runtime + @babel/runtime-corejs3 替换Date.now(),以便解决an issue preventing @sinonjs/fake-timers from working correctly。
根据documentation for core-js,应该有办法阻止它应用es.date.now polyfill,但我不知道如何应用这个配置。
示例
index.js
import FakeTimers from '@sinonjs/fake-timers'
FakeTimers.install()
console.log(new Date().getTime())
console.log(Date.now())
巴别塔转译
$(npm bin)/babel index.js
...
console.log(new Date().getTime());
console.log((0, _now["default"])());
注意traspilation 输出的最后一行——我希望它是console.log(Date.now());
在查看 @babel/preset-env 的文档后,我觉得 the exclude option 是我正在寻找的东西,但我无法让它工作:
module.exports = {
presets: [
['@babel/preset-env', { exclude: ['es.date.now'] }]
],
plugins: [
['@babel/plugin-transform-runtime', { corejs: 3 }]
]
}
上面给了我一个错误:
> $(npm bin)/babel index.js
{ Invariant Violation: [BABEL] ./index.js: Invalid Option: The plugins/built-ins 'es.date.now' passed to the 'exclude' option are not
valid. Please check data/[plugin-features|built-in-features].js in babel-preset-env (While processing: "./node_modules/@babel/preset-env/lib/index.js")
...
如何配置 Babel 以在 traspilation 期间排除 es.date.now polyfill?
项目文件
package.json
{
"name": "test",
"version": "1.0.0",
"description": "",
"main": "index.js",
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1"
},
"author": "",
"license": "ISC",
"devDependencies": {
"@babel/cli": "^7.8.4",
"@babel/core": "^7.9.0",
"@babel/plugin-transform-runtime": "^7.9.0",
"@babel/preset-env": "^7.9.0",
"@babel/register": "^7.9.0"
},
"dependencies": {
"@babel/runtime": "^7.9.2",
"@babel/runtime-corejs3": "^7.9.2",
"@sinonjs/fake-timers": "^6.0.1"
}
}
babel.config.js
module.exports = {
presets: ['@babel/preset-env'],
plugins: [
['@babel/plugin-transform-runtime', { corejs: 3 }]
]
}
【问题讨论】:
-
当然,您可以通过混淆愚蠢的查找替换算法来解决这个问题:``` +const dateObj = Date; + console.log(新日期().getTime()); -console.log(日期。现在()); +console.log(dateObj.now()); ```
-
我遇到了同样的问题,发现如果不使用 plugin-transform-runtime,那么它可以工作。似乎是运行时插件的错误
标签: javascript babeljs sinon core-js