Function contentType

contentType<T>(extensionOrType): Lowercase<T> extends KnownExtensionOrType
? string
: string | undefined
Returns the full Content-Type or Content-Disposition header value for the given extension or media type.

The function will treat the extensionOrType as a media type when it contains a /, otherwise it will process it as an extension, with or without the leading ..

Returns undefined if unable to resolve the media type.
Type Parameters
- T extends string & {} | KnownExtensionOrType
  Type of the extension or media type to resolve.
Parameters
- extensionOrType: T
  The extension or media type to resolve.
Returns Lowercase<T> extends KnownExtensionOrType
? string
: string | undefined
The full Content-Type or Content-Disposition header value, or undefined if unable to resolve the media type.
Example: Usage
```
import { contentType } from "@std/media-types/content-type";
import { assertEquals } from "@std/assert";

assertEquals(contentType(".json"), "application/json; charset=UTF-8");
assertEquals(contentType("text/html"), "text/html; charset=UTF-8");
assertEquals(contentType("text/html; charset=UTF-8"), "text/html; charset=UTF-8");
assertEquals(contentType("txt"), "text/plain; charset=UTF-8");
assertEquals(contentType("foo"), undefined);
assertEquals(contentType("file.json"), undefined);
```
- Defined in media_types/content_type.ts:59