Deno

Fmt/Lint Commands

Format TypeScript, JavaScript, JSON, and Markdown with the built-in formatter. Lint code with configurable rules.

7 commands

Pro Tips

Use '--check' to verify formatting without modifying files.

Configure fmt and lint options in deno.json for project-wide settings.

Run 'deno lint --rules' to see all available lint rules.

Common Mistakes

Deno's formatter is opinionated - limited configuration options.

Use deno.json 'exclude' to skip formatting/linting generated files.

Commands

Type Check

$ deno check script.ts

Type check without running

Format Code

$ deno fmt

Format all files in project

Check Formatting

$ deno fmt --check

Check if files are formatted

Format Specific Files

$ deno fmt src/main.ts src/utils.ts

Format specific files

Lint Code

$ deno lint

Lint all files in project

Lint and Fix

$ deno lint --fix

Auto-fix linting issues

List Lint Rules

$ deno lint --rules

Show all available lint rules