| 1 | The error code system substitutes React's error messages with error IDs to |
| 2 | provide a better debugging support in production. Check out the blog post |
| 3 | [here](https://reactjs.org/blog/2016/07/11/introducing-reacts-error-code-system.html). |
| 4 | |
| 5 | - [`codes.json`](https://github.com/facebook/react/blob/main/scripts/error-codes/codes.json) |
| 6 | contains the mapping from IDs to error messages. This file is generated by the |
| 7 | Gulp plugin and is used by both the Babel plugin and the error decoder page in |
| 8 | our documentation. This file is append-only, which means an existing code in |
| 9 | the file will never be changed/removed. |
| 10 | - [`extract-errors.js`](https://github.com/facebook/react/blob/main/scripts/error-codes/extract-errors.js) |
| 11 | is an node script that traverses our codebase and updates `codes.json`. You |
| 12 | can test it by running `yarn extract-errors`. It works by crawling the build |
| 13 | artifacts directory, so you need to have either run the build script or |
| 14 | downloaded pre-built artifacts (e.g. with `yarn download build`). It works |
| 15 | with partial builds, too. |
| 16 | - [`transform-error-messages`](https://github.com/facebook/react/blob/main/scripts/error-codes/transform-error-messages.js) |
| 17 | is a Babel pass that rewrites error messages to IDs for a production |
| 18 | (minified) build. |