如何解决TypeError:environment.teardown不是函数 [英] How to solve TypeError: environment.teardown is not a function

问题描述

我无法测试使用create-react-app创建的应用程序.

I can't test an application which was created with create-react-app.

所有指南都说该测试默认情况下有效，但是当我尝试"yarn test"时，它需要安装"jest-cli"，并且安装后出现错误:

All guides says that test is working by default, but when I try "yarn test", it requires install 'jest-cli' and after installation gives an error:

TypeError:environment.teardown不是函数

TypeError: environment.teardown is not a function

推荐答案

您不需要自己安装jest-cli.它应该是开箱即用的.

You shouldn't need to install jest-cli yourself. It should come out of the box.

请尝试以下操作:

1. 删除package-lock.json，yarn.lock和node_modules
2. 从package.json中的依赖项中删除笑话
3. 然后执行npm install或yarn install.

1. Delete package-lock.json, yarn.lock and node_modules
2. Remove jest from the dependencies in package.json
3. Then do npm install or yarn install.

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