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Oct 27, 2025
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Minor improvement to typescript page #2689

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17 changes: 7 additions & 10 deletions runtime/fundamentals/typescript.md
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Expand Up @@ -11,19 +11,16 @@ oldUrl:
- /runtime/fundamentals/
---

TypeScript is a first class language in Deno, just like JavaScript or
WebAssembly. You can run or import TypeScript without installing anything more
than the Deno CLI. With its built-in TypeScript compiler, Deno will compile your
TypeScript code to JavaScript with no extra config needed. Deno can also type
check your TypeScript code, without requiring a separate type checking tool like
`tsc`.
TypeScript is a first class language in Deno. You can run or import TypeScript
without installing anything more than the Deno CLI. With its built-in TypeScript
compiler, Deno will compile your TypeScript code to JavaScript with no extra
config needed. Deno can also type check your TypeScript code, without requiring
a separate type checking tool like `tsc`.
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@dsherret dsherret Oct 27, 2025

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Removed ", just like JavaScript or WebAssembly" here because WebAssembly isn't really first class (it can be loaded, but not executed directly yet)


## Type Checking

One of the main advantages of TypeScript is that it can make your code type
safe, catching errors during development rather than runtime. TypeScript is a
superset of JavaScript meaning that syntactically valid JavaScript becomes
TypeScript with warnings about being "unsafe".
safe, catching errors during development rather than runtime.
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@dsherret dsherret Oct 27, 2025

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Removed "TypeScript is a superset of JavaScript meaning that syntactically valid JavaScript becomes TypeScript with warnings about being "unsafe"." because some people quibble about TS not being a strict superset of JS and also the word "unsafe" makes me personally think about unsafe code in Rust or other languages.


:::note

Expand Down Expand Up @@ -169,7 +166,7 @@ the TypeScript module that imports the JavaScript module.
import { add } from "./add.js";
```

This is also useful for NPM packages that don't provide type information:
This is also useful for npm packages that don't provide type information:
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@dsherret dsherret Oct 27, 2025

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Preferred casing of npm according to npm https://github.com/npm/cli#faq-on-branding


```ts title="main.ts"
// @ts-types="npm:@types/lodash"
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