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ESLint

Official module: dagger/eslint

Install with dagger mod install github.com/dagger/eslint.

What It Is​

The ESLint module checks JavaScript and TypeScript source with ESLint.

Use it when the repo already has ESLint config and you want linting to run as a Dagger check.

Use It For​

  • Catch code issues before a PR lands.
  • Run the same lint check locally and in CI.
  • Produce a repair workflow for fixable lint issues.

Main Workflows​

  • lint: run ESLint and fail on lint errors.
  • fix: apply ESLint fixes and return corrected source.

How to Use It​

Install the module, then run its check:

dagger mod install github.com/dagger/eslint

dagger check             # run every check in the workspace
dagger check eslint:lint # run ESLint against the workspace source

lint installs dependencies and runs eslint . over the whole workspace using the project's own ESLint configuration, so the result matches what developers see locally.

Settings​

List the current settings and their values with dagger settings eslint, then set one with dagger settings eslint <key> <value>. Settings are stored in .dagger/config.toml under [modules.eslint.settings].

  • packageManager (default npm): the package manager used to install dependencies before linting. Set it to yarn or pnpm to match the project, so the same lockfile and dependency versions are used.
  • baseImageAddress (default node:25-alpine): the Node base image ESLint runs in. Pin it to the project's Node version, for example node:22-alpine.
[modules.eslint.settings]
packageManager = "pnpm"
baseImageAddress = "node:22-alpine"

Fixing issues​

ESLint also exposes a fix function that runs eslint . --fix and returns the repaired source as a changeset (excluding node_modules). It is a regular function rather than a check, so it does not run during dagger check; call it with dagger function call (run dagger function list to see available functions).

Workspace Fit​

Use ESLint with Prettier when the project separates lint rules from formatting. Use Biome when the project has moved linting and formatting into one tool.

Source​

Source repo: github.com/dagger/eslint