check.md

title	oldUrl	command	openGraphLayout	openGraphTitle	description
deno check	/runtime/manual/tools/check/	check	/open_graph/cli-commands.jsx	deno check	Download and type-check code without execution

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