ts-jest 无法识别 es6 导入 [英] ts-jest does not recognize es6 imports
问题描述
我正在向 React 代码库添加 typescript 支持,虽然应用程序运行正常,但 Jest 测试到处都失败了,显然无法识别 es6 语法.
I'm adding typescript support to a react codebase, and while the app is working ok, jest tests are failing all over the place, apparently not recognizing something about es6 syntax.
我们为此使用了 ts-jest.以下是我在尝试处理 jest 的测试设置文件时立即收到的错误消息.
We're using ts-jest for this. Below is the error message I'm getting, right off the bat when trying to process jest's tests setup file.
FAIL src/data/reducers/reducers.test.js
● Test suite failed to run
/Users/ernesto/code/app/react/setupTests.js:1
({"Object.<anonymous>":function(module,exports,require,__dirname,__filename,global,jest){import './polyfills';
^^^^^^^^^^^^^
SyntaxError: Unexpected string
at ScriptTransformer._transformAndBuildScript (node_modules/jest-runtime/build/script_transformer.js:403:17)
它无法识别一个简单的import './polyfills'
,说引用的字符串是意外的.
It fails to recognize a simple import './polyfills'
, saying that the quoted string is unexpected.
这些是我的设置:
package.json 中的 jest 配置
jest config in package.json
"jest": {
"setupTestFrameworkScriptFile": "<rootDir>/app/react/setupTests.js",
"transform": {
"^.+\.tsx?$": "ts-jest"
},
"testRegex": "(/__tests__/.*|(\.|/)(test|spec))\.(jsx?|tsx?)$",
"moduleFileExtensions": [
"ts",
"tsx",
"js",
"jsx",
"json",
"node"
]
},
tsconfig.json
tsconfig.json
{
"compilerOptions": {
"declaration": false,
"emitDecoratorMetadata": true,
"experimentalDecorators": true,
"lib": ["es6", "dom"],
"module": "es6",
"moduleResolution": "node",
"allowJs": true,
"allowSyntheticDefaultImports": true,
"sourceMap": true,
"target": "es5",
"jsx": "react",
"forceConsistentCasingInFileNames": true,
"noImplicitReturns": true,
"noImplicitThis": true,
"noImplicitAny": true,
"skipDefaultLibCheck": true,
"strictPropertyInitialization": true,
"strictNullChecks": true,
"suppressImplicitAnyIndexErrors": true,
"noUnusedLocals": true,
"noErrorTruncation": true
},
"exclude": ["app/assets","node_modules", "vendor", "public"],
"compileOnSave": false
}
.babelrc
{
"presets": [
[
"env",
{
"modules": false,
"targets": {
"browsers": "> 1%",
"uglify": true
},
"useBuiltIns": true
}
],
"react",
"es2015"
],
"plugins": [
"syntax-dynamic-import",
"transform-object-rest-spread",
[
"transform-class-properties",
{
"spec": true
}
]
]
}
如果相关,这是在 rails 应用程序中使用的 React 代码库,我们使用的是 rails/webpacker 到此为止.我们按照他们的说明为它添加了 TypeScript 支持,并且除了这个笑话部分,他们没有涵盖.
In case it is relevant, this is a React codebase being used inside a rails app, and we're using rails/webpacker to that end. We followed their instructions to add TypeScript support to it, and it worked like a charm, except for this jest part, which they do not cover.
推荐答案
我最终发现了问题所在.事实证明,它一直在 ts-jest 的 README 中.
I eventually found out what the problem was. It turns out it was there in ts-jest's README all the time.
自述文件中有一个标题为 Using ES2015+ features 的部分在 Javascript 文件中.在这些情况下,您需要指示 jest 使用 babel-jest
作为 .js 文件的转换.
There's a section in the README titled Using ES2015+ features in Javascript files. In these cases, you need to instruct jest to use babel-jest
as a transform for .js files.
"jest": {
"transform": {
"^.+\.jsx?$": "babel-jest", // Adding this line solved the issue
"^.+\.tsx?$": "ts-jest"
},
// ...
},
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