Codemod for ignoring lint errors

--- title: Codemod for ignoring lint errors published: true description: tags: javascript, ember, showdev, opensource canonical_url: https://crunchingnumbers.live/2026/04/27/codemod-for-ignoring-lint-errors/ --- Meet my new codemod, [`ignore-lint-errors`](https://github.com/ijlee2/ignore-lint-errors). It helps us ignore lint errors from [eslint](https://eslint.org/), [stylelint](https://stylelint.io/), and [typescript](https://www.typescriptlang.org/) ([glint](https://typed-ember.gitbook.io/glint) for Ember projects). ## A. Why should we ignore errors In large production projects, ignoring lint errors for existing code is the most pragmatic, quickest approach to complete these tasks: - Introduce a lint rule. - Update a linter to the next minor or major version. - Migrate code to a different format, e.g. convert `*.{gjs,js}` (JavaScript) to `*.{gts,ts}` (TypeScript). For the sake of reducing noise, some prefer disabling linting for the entire file. They do so by adding a global directive (e.g. `eslint-disable`) or creating a special file to "suppress" files with many errors. Instead, `ignore-lint-errors` takes the honest approach: It adds a local directive (e.g. `eslint-disable-next-line`) for every line that has an error. This way, we can easily see and show others (including non-engineers and AIs), - How bad our code is to increase the urgency to fix issues. The number of local ignores (1 per line) will always estimate the actual number of errors better than the number of global ignores (1 per file). - Which parts of our code are good and should be replicated, and which parts are bad and to be avoided. When there is a global ignore, a linter won't check the file for the given rule(s). ## B. How to use `ignore-lint-errors` 1\. Run codemod. ```sh cd <path/to/your/project> pnpx ignore-lint-errors --linter eslint ``` 2\. Fix formatting. ```sh # Run prettier pnpm prettier . --write ``` To speed things up, the codemod uses [`eslint`'s multithreading](https://eslint.org/blog/2025/08/multithread-linting/) and allows you to specify which files to consider. For more information, see [Usage > Arguments](https://github.com/ijlee2/ignore-lint-errors#arguments).