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[英]Mocha says "ERROR: Unexpected token {" (using @babel/preset-env)
[英]Babel with preset-env (no options) and preset-typescript says “Missing class properties transform”. Why?
我有一个相当简单的 Babel 配置:
{
presets: [
[
'@babel/preset-typescript',
{
isTSX: true,
allExtensions: true,
allowNamespaces: true,
onlyRemoveTypeImports: true,
},
],
['@babel/preset-env', {}],
],
plugins: ['@babel/plugin-transform-react-jsx'],
},
这将在我的 Webpack 设置中传递给babel-loader
。 然后我在构建时收到如下错误:
ERROR in ./store/state/AppState.ts
Module build failed (from ../node_modules/babel-loader/lib/index.js):
SyntaxError: /home/trusktr/src/my-project/src/store/state/AppState.ts: Missing class properties transform.
25 |
26 | export class AppState implements State<string> {
> 27 | static Key = 'AppState'
这是版本:
❯ npm ls @babel/core @babel/preset-env @babel/preset-typescript @babel/plugin-transform-react-jsx babel-loader
my-project@1.0.0 /home/trusktr/src/my-project
├── @babel/core@7.9.0
├── @babel/plugin-transform-react-jsx@7.9.4
├── @babel/preset-env@7.9.5
├── @babel/preset-typescript@7.9.0
└── babel-loader@8.1.0
任何想法为什么会发生这种情况? 是不是preset-env
环境假设可以处理诸如 class 字段之类的基本内容?
您需要将“@babel/plugin-proposal-class-properties”添加到您的插件配置中。 AFAIK,Babel 预设不是自己做的。
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