Watch Mode
Noun · Development
Definitions
A development mode in build tools, test runners, and compilers that monitors source files for changes using filesystem events and automatically re-runs the relevant build, transpilation, or test suite when a file is saved.
In plain English: A setting that makes your tools automatically redo their work every time you save a file, so you see results instantly.
Example: "Run Jest in watch mode and it'll only re-run the tests affected by the files you changed."