type TypeMap = { [key: string]: string[] }; class Mime { #extensionToType = new Map(); #typeToExtension = new Map(); #typeToExtensions = new Map>(); constructor(...args: TypeMap[]) { for (const arg of args) { this.define(arg); } } /** * Define mimetype -> extension mappings. Each key is a mime-type that maps * to an array of extensions associated with the type. The first extension is * used as the default extension for the type. * * e.g. mime.define({'audio/ogg', ['oga', 'ogg', 'spx']}); * * If a mapping for an extension has already been defined an error will be * thrown unless the `force` argument is set to `true`. * * e.g. mime.define({'audio/wav', ['wav']}, {'audio/x-wav', ['*wav']}); */ define(typeMap: TypeMap, force = false) { for (let [type, extensions] of Object.entries(typeMap)) { // Lowercase thingz type = type.toLowerCase(); extensions = extensions.map((ext) => ext.toLowerCase()); if (!this.#typeToExtensions.has(type)) { this.#typeToExtensions.set(type, new Set()); } const allExtensions = this.#typeToExtensions.get(type); let first = true; for (let extension of extensions) { const starred = extension.startsWith("*"); extension = starred ? extension.slice(1) : extension; // Add to list of extensions for the type allExtensions?.add(extension); if (first) { // Map type to default extension (first in list) this.#typeToExtension.set(type, extension); } first = false; // Starred types are not eligible to be the default extension if (starred) continue; // Map extension to type const currentType = this.#extensionToType.get(extension); if (currentType && currentType != type && !force) { throw new Error( `"${type} -> ${extension}" conflicts with "${currentType} -> ${extension}". Pass \`force=true\` to override this definition.` ); } this.#extensionToType.set(extension, type); } } return this; } /** * Get mime type associated with an extension */ getType(path: string) { if (typeof path !== "string") return null; // Remove chars preceding `/` or `\` const last = path.replace(/^.*[/\\]/, "").toLowerCase(); // Remove chars preceding '.' const ext = last.replace(/^.*\./, "").toLowerCase(); const hasPath = last.length < path.length; const hasDot = ext.length < last.length - 1; // Extension-less file? if (!hasDot && hasPath) return null; return this.#extensionToType.get(ext) ?? null; } // // Private API, for internal use only. These APIs may change at any time // _freeze() { this.define = () => { throw new Error( "define() not allowed for built-in Mime objects. See https://github.com/broofa/mime/blob/main/README.md#custom-mime-instances" ); }; Object.freeze(this); for (const extensions of this.#typeToExtensions.values()) { Object.freeze(extensions); } return this; } } const standardTypes: TypeMap = { "application/andrew-inset": ["ez"], "application/appinstaller": ["appinstaller"], "application/applixware": ["aw"], "application/appx": ["appx"], "application/appxbundle": ["appxbundle"], "application/atom+xml": ["atom"], "application/atomcat+xml": ["atomcat"], "application/atomdeleted+xml": ["atomdeleted"], "application/atomsvc+xml": ["atomsvc"], "application/atsc-dwd+xml": ["dwd"], "application/atsc-held+xml": ["held"], "application/atsc-rsat+xml": ["rsat"], "application/automationml-aml+xml": ["aml"], "application/automationml-amlx+zip": ["amlx"], "application/bdoc": ["bdoc"], "application/calendar+xml": ["xcs"], "application/ccxml+xml": ["ccxml"], "application/cdfx+xml": ["cdfx"], "application/cdmi-capability": ["cdmia"], "application/cdmi-container": ["cdmic"], "application/cdmi-domain": ["cdmid"], "application/cdmi-object": ["cdmio"], "application/cdmi-queue": ["cdmiq"], "application/cpl+xml": ["cpl"], "application/cu-seeme": ["cu"], "application/cwl": ["cwl"], "application/dash+xml": ["mpd"], "application/dash-patch+xml": ["mpp"], "application/davmount+xml": ["davmount"], "application/dicom": ["dcm"], "application/docbook+xml": ["dbk"], "application/dssc+der": ["dssc"], "application/dssc+xml": ["xdssc"], "application/ecmascript": ["ecma"], "application/emma+xml": ["emma"], "application/emotionml+xml": ["emotionml"], "application/epub+zip": ["epub"], "application/exi": ["exi"], "application/express": ["exp"], "application/fdf": ["fdf"], "application/fdt+xml": ["fdt"], "application/font-tdpfr": ["pfr"], "application/geo+json": ["geojson"], "application/gml+xml": ["gml"], "application/gpx+xml": ["gpx"], "application/gxf": ["gxf"], "application/gzip": ["gz"], "application/hjson": ["hjson"], "application/hyperstudio": ["stk"], "application/inkml+xml": ["ink", "inkml"], "application/ipfix": ["ipfix"], "application/its+xml": ["its"], "application/java-archive": ["jar", "war", "ear"], "application/java-serialized-object": ["ser"], "application/java-vm": ["class"], "application/javascript": ["*js"], "application/json": ["json", "map"], "application/json5": ["json5"], "application/jsonml+json": ["jsonml"], "application/ld+json": ["jsonld"], "application/lgr+xml": ["lgr"], "application/lost+xml": ["lostxml"], "application/mac-binhex40": ["hqx"], "application/mac-compactpro": ["cpt"], "application/mads+xml": ["mads"], "application/manifest+json": ["webmanifest"], "application/marc": ["mrc"], "application/marcxml+xml": ["mrcx"], "application/mathematica": ["ma", "nb", "mb"], "application/mathml+xml": ["mathml"], "application/mbox": ["mbox"], "application/media-policy-dataset+xml": ["mpf"], "application/mediaservercontrol+xml": ["mscml"], "application/metalink+xml": ["metalink"], "application/metalink4+xml": ["meta4"], "application/mets+xml": ["mets"], "application/mmt-aei+xml": ["maei"], "application/mmt-usd+xml": ["musd"], "application/mods+xml": ["mods"], "application/mp21": ["m21", "mp21"], "application/mp4": ["*mp4", "*mpg4", "mp4s", "m4p"], "application/msix": ["msix"], "application/msixbundle": ["msixbundle"], "application/msword": ["doc", "dot"], "application/mxf": ["mxf"], "application/n-quads": ["nq"], "application/n-triples": ["nt"], "application/node": ["cjs"], "application/octet-stream": [ "bin", "dms", "lrf", "mar", "so", "dist", "distz", "pkg", "bpk", "dump", "elc", "deploy", "exe", "dll", "deb", "dmg", "iso", "img", "msi", "msp", "msm", "buffer", ], "application/oda": ["oda"], "application/oebps-package+xml": ["opf"], "application/ogg": ["ogx"], "application/omdoc+xml": ["omdoc"], "application/onenote": [ "onetoc", "onetoc2", "onetmp", "onepkg", "one", "onea", ], "application/oxps": ["oxps"], "application/p2p-overlay+xml": ["relo"], "application/patch-ops-error+xml": ["xer"], "application/pdf": ["pdf"], "application/pgp-encrypted": ["pgp"], "application/pgp-keys": ["asc"], "application/pgp-signature": ["sig", "*asc"], "application/pics-rules": ["prf"], "application/pkcs10": ["p10"], "application/pkcs7-mime": ["p7m", "p7c"], "application/pkcs7-signature": ["p7s"], "application/pkcs8": ["p8"], "application/pkix-attr-cert": ["ac"], "application/pkix-cert": ["cer"], "application/pkix-crl": ["crl"], "application/pkix-pkipath": ["pkipath"], "application/pkixcmp": ["pki"], "application/pls+xml": ["pls"], "application/postscript": ["ai", "eps", "ps"], "application/provenance+xml": ["provx"], "application/pskc+xml": ["pskcxml"], "application/raml+yaml": ["raml"], "application/rdf+xml": ["rdf", "owl"], "application/reginfo+xml": ["rif"], "application/relax-ng-compact-syntax": ["rnc"], "application/resource-lists+xml": ["rl"], "application/resource-lists-diff+xml": ["rld"], "application/rls-services+xml": ["rs"], "application/route-apd+xml": ["rapd"], "application/route-s-tsid+xml": ["sls"], "application/route-usd+xml": ["rusd"], "application/rpki-ghostbusters": ["gbr"], "application/rpki-manifest": ["mft"], "application/rpki-roa": ["roa"], "application/rsd+xml": ["rsd"], "application/rss+xml": ["rss"], "application/rtf": ["rtf"], "application/sbml+xml": ["sbml"], "application/scvp-cv-request": ["scq"], "application/scvp-cv-response": ["scs"], "application/scvp-vp-request": ["spq"], "application/scvp-vp-response": ["spp"], "application/sdp": ["sdp"], "application/senml+xml": ["senmlx"], "application/sensml+xml": ["sensmlx"], "application/set-payment-initiation": ["setpay"], "application/set-registration-initiation": ["setreg"], "application/shf+xml": ["shf"], "application/sieve": ["siv", "sieve"], "application/smil+xml": ["smi", "smil"], "application/sparql-query": ["rq"], "application/sparql-results+xml": ["srx"], "application/sql": ["sql"], "application/srgs": ["gram"], "application/srgs+xml": ["grxml"], "application/sru+xml": ["sru"], "application/ssdl+xml": ["ssdl"], "application/ssml+xml": ["ssml"], "application/swid+xml": ["swidtag"], "application/tei+xml": ["tei", "teicorpus"], "application/thraud+xml": ["tfi"], "application/timestamped-data": ["tsd"], "application/toml": ["toml"], "application/trig": ["trig"], "application/ttml+xml": ["ttml"], "application/ubjson": ["ubj"], "application/urc-ressheet+xml": ["rsheet"], "application/urc-targetdesc+xml": ["td"], "application/voicexml+xml": ["vxml"], "application/wasm": ["wasm"], "application/watcherinfo+xml": ["wif"], "application/widget": ["wgt"], "application/winhlp": ["hlp"], "application/wsdl+xml": ["wsdl"], "application/wspolicy+xml": ["wspolicy"], "application/xaml+xml": ["xaml"], "application/xcap-att+xml": ["xav"], "application/xcap-caps+xml": ["xca"], "application/xcap-diff+xml": ["xdf"], "application/xcap-el+xml": ["xel"], "application/xcap-ns+xml": ["xns"], "application/xenc+xml": ["xenc"], "application/xfdf": ["xfdf"], "application/xhtml+xml": ["xhtml", "xht"], "application/xliff+xml": ["xlf"], "application/xml": ["xml", "xsl", "xsd", "rng"], "application/xml-dtd": ["dtd"], "application/xop+xml": ["xop"], "application/xproc+xml": ["xpl"], "application/xslt+xml": ["*xsl", "xslt"], "application/xspf+xml": ["xspf"], "application/xv+xml": ["mxml", "xhvml", "xvml", "xvm"], "application/yang": ["yang"], "application/yin+xml": ["yin"], "application/zip": ["zip"], "application/zip+dotlottie": ["lottie"], "audio/3gpp": ["*3gpp"], "audio/aac": ["adts", "aac"], "audio/adpcm": ["adp"], "audio/amr": ["amr"], "audio/basic": ["au", "snd"], "audio/midi": ["mid", "midi", "kar", "rmi"], "audio/mobile-xmf": ["mxmf"], "audio/mp3": ["*mp3"], "audio/mp4": ["m4a", "mp4a", "m4b"], "audio/mpeg": ["mpga", "mp2", "mp2a", "mp3", "m2a", "m3a"], "audio/ogg": ["oga", "ogg", "spx", "opus"], "audio/s3m": ["s3m"], "audio/silk": ["sil"], "audio/wav": ["wav"], "audio/wave": ["*wav"], "audio/webm": ["weba"], "audio/xm": ["xm"], "font/collection": ["ttc"], "font/otf": ["otf"], "font/ttf": ["ttf"], "font/woff": ["woff"], "font/woff2": ["woff2"], "image/aces": ["exr"], "image/apng": ["apng"], "image/avci": ["avci"], "image/avcs": ["avcs"], "image/avif": ["avif"], "image/bmp": ["bmp", "dib"], "image/cgm": ["cgm"], "image/dicom-rle": ["drle"], "image/dpx": ["dpx"], "image/emf": ["emf"], "image/fits": ["fits"], "image/g3fax": ["g3"], "image/gif": ["gif"], "image/heic": ["heic"], "image/heic-sequence": ["heics"], "image/heif": ["heif"], "image/heif-sequence": ["heifs"], "image/hej2k": ["hej2"], "image/ief": ["ief"], "image/jaii": ["jaii"], "image/jais": ["jais"], "image/jls": ["jls"], "image/jp2": ["jp2", "jpg2"], "image/jpeg": ["jpg", "jpeg", "jpe"], "image/jph": ["jph"], "image/jphc": ["jhc"], "image/jpm": ["jpm", "jpgm"], "image/jpx": ["jpx", "jpf"], "image/jxl": ["jxl"], "image/jxr": ["jxr"], "image/jxra": ["jxra"], "image/jxrs": ["jxrs"], "image/jxs": ["jxs"], "image/jxsc": ["jxsc"], "image/jxsi": ["jxsi"], "image/jxss": ["jxss"], "image/ktx": ["ktx"], "image/ktx2": ["ktx2"], "image/pjpeg": ["jfif"], "image/png": ["png"], "image/sgi": ["sgi"], "image/svg+xml": ["svg", "svgz"], "image/t38": ["t38"], "image/tiff": ["tif", "tiff"], "image/tiff-fx": ["tfx"], "image/webp": ["webp"], "image/wmf": ["wmf"], "message/disposition-notification": ["disposition-notification"], "message/global": ["u8msg"], "message/global-delivery-status": ["u8dsn"], "message/global-disposition-notification": ["u8mdn"], "message/global-headers": ["u8hdr"], "message/rfc822": ["eml", "mime", "mht", "mhtml"], "model/3mf": ["3mf"], "model/gltf+json": ["gltf"], "model/gltf-binary": ["glb"], "model/iges": ["igs", "iges"], "model/jt": ["jt"], "model/mesh": ["msh", "mesh", "silo"], "model/mtl": ["mtl"], "model/obj": ["obj"], "model/prc": ["prc"], "model/step": ["step", "stp", "stpnc", "p21", "210"], "model/step+xml": ["stpx"], "model/step+zip": ["stpz"], "model/step-xml+zip": ["stpxz"], "model/stl": ["stl"], "model/u3d": ["u3d"], "model/vrml": ["wrl", "vrml"], "model/x3d+binary": ["*x3db", "x3dbz"], "model/x3d+fastinfoset": ["x3db"], "model/x3d+vrml": ["*x3dv", "x3dvz"], "model/x3d+xml": ["x3d", "x3dz"], "model/x3d-vrml": ["x3dv"], "text/cache-manifest": ["appcache", "manifest"], "text/calendar": ["ics", "ifb"], "text/coffeescript": ["coffee", "litcoffee"], "text/css": ["css"], "text/csv": ["csv"], "text/html": ["html", "htm", "shtml"], "text/jade": ["jade"], "text/javascript": ["js", "mjs"], "text/jsx": ["jsx"], "text/less": ["less"], "text/markdown": ["md", "markdown"], "text/mathml": ["mml"], "text/mdx": ["mdx"], "text/n3": ["n3"], "text/plain": ["txt", "text", "conf", "def", "list", "log", "in", "ini"], "text/richtext": ["rtx"], "text/rtf": ["*rtf"], "text/sgml": ["sgml", "sgm"], "text/shex": ["shex"], "text/slim": ["slim", "slm"], "text/spdx": ["spdx"], "text/stylus": ["stylus", "styl"], "text/tab-separated-values": ["tsv"], "text/troff": ["t", "tr", "roff", "man", "me", "ms"], "text/turtle": ["ttl"], "text/uri-list": ["uri", "uris", "urls"], "text/vcard": ["vcard"], "text/vtt": ["vtt"], "text/wgsl": ["wgsl"], "text/xml": ["*xml"], "text/yaml": ["yaml", "yml"], "video/3gpp": ["3gp", "3gpp"], "video/3gpp2": ["3g2"], "video/h261": ["h261"], "video/h263": ["h263"], "video/h264": ["h264"], "video/iso.segment": ["m4s"], "video/jpeg": ["jpgv"], "video/jpm": ["*jpm", "*jpgm"], "video/mj2": ["mj2", "mjp2"], "video/mp2t": ["ts", "m2t", "m2ts", "mts"], "video/mp4": ["mp4", "mp4v", "mpg4"], "video/mpeg": ["mpeg", "mpg", "mpe", "m1v", "m2v"], "video/ogg": ["ogv"], "video/quicktime": ["qt", "mov"], "video/webm": ["webm"], }; Object.freeze(standardTypes); const mime = new Mime(standardTypes)._freeze(); export function getMimeType(path: string): string | null { return mime.getType(path); }