deno check

Examples

Type-check a TypeScript file without execution:

const x: string = 1 + 1n;

deno check example.ts

Type-checking JavaScript files

If you have a JavaScript-only project and want to type-check it with Deno, you can use the --check-js flag instead of adding // @ts-check to every file or setting compilerOptions.checkJs in your deno.json:

deno check --check-js main.js