jest:tldr:becde

jest: Watch files for changes and automatically re-run related tests.

jest

$ jest --watch

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The command "jest --watch" is used to run the Jest test runner in watch mode.

Jest is a popular JavaScript testing framework that can be used to write tests for JavaScript code. It provides a command-line interface (CLI) to run the tests and perform various operations related to testing.

The "--watch" option is used to enable watch mode. In watch mode, Jest continually monitors your project files for any changes. When a change is detected, Jest automatically re-runs the relevant tests. This can be useful during development as you can immediately see the impact of your code changes on the tests and quickly detect any potential issues.

By running the "jest --watch" command, Jest starts running the tests and keeps monitoring the project files. It displays the test results in the terminal and updates them whenever changes are detected. This allows you to have instant feedback on the status of your tests without needing to manually run the tests after every change.

This explanation was created by an AI. In most cases those are correct. But please always be careful and never run a command you are not sure if it is safe.

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