12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758
// MIME Types for Webconst mimeTypes: Record<string, string[]> = {    // application    'application/javascript': ['js', 'mjs'],    'application/wasm': ['wasm'],    'application/json': ['json', 'map'],    'application/json5': ['json5'],    'application/pdf': ['pdf'],    'application/xml': ['xml', 'xsl'],    // text    'text/html': ['html', 'htm'],    'text/markdown': ['md', 'markdown'],    'text/mdx': ['mdx'],    'text/typescript': ['ts', 'tsx'],    'text/jsx': ['jsx'],    'text/css': ['css'],    'text/less': ['less'],    'text/sass': ['sass', 'scss'],    'text/stylus': ['stylus', 'styl'],    'text/csv': ['csv'],    'text/plain': ['txt', 'text', 'conf', 'ini', 'log', 'yaml'],    // font    'font/ttf': ['ttf'],    'font/otf': ['otf'],    'font/woff': ['woff'],    'font/woff2': ['woff2'],    'font/collection': ['ttc'],    // image    'image/jpeg': ['jpeg', 'jpg', 'jpe'],    'image/png': ['png'],    'image/apng': ['apng'],    'image/gif': ['gif'],    'image/webp': ['webp'],    'image/svg+xml': ['svg', 'svgz'],    'image/x-icon': ['ico'],    // audio    'audio/mp4': ['m4a', 'mp4a'],    'audio/mpeg': ['mp3', 'm3a'],    'audio/ogg': ['oga', 'ogg', 'spx'],    'audio/wav': ['wav'],    'audio/webm': ['weba'],    // video    'video/mp4': ['mp4', 'm4v', 'mp4v', 'mpg4'],    'video/ogg': ['ogv'],    'video/webm': ['webm'],}const defaultType = 'application/octet-stream'const typesMap = Object.keys(mimeTypes).reduce((map, contentType) => {    mimeTypes[contentType].forEach(ext => map.set(ext, contentType))    return map}, new Map<string, string>())
/** get content type by file name */export function getContentType(filename: string): string {    const ext = filename.split('.').pop()!.toLowerCase()    return typesMap.get(ext) ?? defaultType}