detectContentType

Summary

Detects the Content-Type header value for a given file extension or filename.

Returns a full Content-Type value including charset when appropriate, based on the charset defined in mime-db for the detected MIME type.

Signature

function detectContentType(extension: string): string | undefined

Example

detectContentType('css') // 'text/css;charset=utf-8'
detectContentType('.css') // 'text/css;charset=utf-8'
detectContentType('style.css') // 'text/css;charset=utf-8'
detectContentType('image.png') // 'image/png'
detectContentType('unknown') // undefined

Parameters

extension

The file extension (e.g. "css", ".css") or filename (e.g. "style.css")

Returns

The Content-Type value, or undefined if not found