Function resolveFileExtension

Returns
    | ".json"
    | ".html"
    | ".htm"
    | ".png"
    | ".jpeg"
    | ".jpg"
    | ".jpe"
    | ".jfif"
    | ".zip"
    | ".svg"
    | ".svgz"
    | ".css"
    | ".ttf"
    | ".pdf"
    | ".csv"
    | ".xlsx"
    | ".docx"
    | ".txt"
    | ".xml"
    | ".gz"
    | ".gzip"
    | ".tar"
    | ".wasm"
    | ".jsonld"
    | ".json-ld"
    | ".ndjson"
    | ".jsonl"
    | ".pptx"
    | ".js"
    | ".cjs"
    | ".mjs"
    | ".yaml"
    | ".yml"
    | ".gif"
    | ".webp"
    | ".ico"
    | ".cur"
    | ".bmp"
    | ".dib"
    | ".tif"
    | ".tiff"
    | ".avif"
    | ".mp3"
    | ".wav"
    | ".ogg"
    | ".oga"
    | ".weba"
    | ".mp4"
    | ".m4v"
    | ".webm"
    | ".ogv"
    | ".otf"
    | ".woff"
    | ".woff2"
    | undefined

The resolved file extension or undefined if it could not be resolved.