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Normalize MIME-types we invented with /x-ft- prefix #768

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Normalize MIME-types we invented with /x-ft- prefix #768

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69954c8
Normalize MIME-types we invented with `/x-ft-` prefix
Borewit Jun 14, 2025
69f1550
Update supported.js
sindresorhus Jun 15, 2025
6d58d1a
Update readme.md
sindresorhus Jun 15, 2025
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12 changes: 6 additions & 6 deletions core.js
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Original file line number Diff line number Diff line change
Expand Up @@ -723,7 +723,7 @@ export class FileTypeParser {
if (this.checkString('LZIP')) {
return {
ext: 'lz',
mime: 'application/x-lzip',
mime: 'application/lzip',
};
}

Expand Down Expand Up @@ -943,7 +943,7 @@ export class FileTypeParser {
if (this.check([0x04, 0x22, 0x4D, 0x18])) {
return {
ext: 'lz4',
mime: 'application/x-lz4', // Invented by us
mime: 'application/x-lz4',
};
}

Expand Down Expand Up @@ -1056,7 +1056,7 @@ export class FileTypeParser {
if (this.checkString('DRACO')) {
return {
ext: 'drc',
mime: 'application/vnd.google.draco', // Invented by us
mime: 'application/x-ft-draco',
};
}

Expand Down Expand Up @@ -1616,21 +1616,21 @@ export class FileTypeParser {
if (this.check([0x4C, 0x00, 0x00, 0x00, 0x01, 0x14, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0xC0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x46])) {
return {
ext: 'lnk',
mime: 'application/x.ms.shortcut', // Invented by us
mime: 'application/x-ms-shortcut', // Informal, used by freedesktop.org. shared-mime-info
};
}

if (this.check([0x62, 0x6F, 0x6F, 0x6B, 0x00, 0x00, 0x00, 0x00, 0x6D, 0x61, 0x72, 0x6B, 0x00, 0x00, 0x00, 0x00])) {
return {
ext: 'alias',
mime: 'application/x.apple.alias', // Invented by us
mime: 'application/x-ft-apple.alias',
};
}

if (this.checkString('Kaydara FBX Binary \u0000')) {
return {
ext: 'fbx',
mime: 'application/x.autodesk.fbx', // Invented by us
mime: 'application/x-ft-fbx',
};
}

Expand Down
2 changes: 2 additions & 0 deletions readme.md
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Expand Up @@ -122,6 +122,8 @@ Returns a `Promise` for an object with the detected file type:
- `ext` - One of the [supported file types](#supported-file-types)
- `mime` - The [MIME type](https://en.wikipedia.org/wiki/Internet_media_type)

MIME media subtypes prefixed with `x-ft-` are custom and defined by us. They are neither formally registered with IANA nor based on any informal conventions.

Or `undefined` when there is no match.

#### buffer
Expand Down
15 changes: 9 additions & 6 deletions supported.js
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Expand Up @@ -179,6 +179,9 @@ export const extensions = [
'dat',
];

/**
MIME media subtypes prefixed with `x-ft-` are custom and defined by us. They are neither formally registered with IANA nor based on any informal conventions.
*/
export const mimeTypes = [
'image/jpeg',
'image/png',
Expand Down Expand Up @@ -260,7 +263,7 @@ export const mimeTypes = [
'application/x-unix-archive',
'application/x-rpm',
'application/x-compress',
'application/x-lzip',
'application/lzip',
'application/x-cfb',
'application/x-mie',
'application/mxf',
Expand Down Expand Up @@ -288,9 +291,9 @@ export const mimeTypes = [
'text/vtt',
'model/gltf-binary',
'application/vnd.tcpdump.pcap',
'audio/x-dsf', // Non-standard
'application/x.ms.shortcut', // Invented by us
'application/x.apple.alias', // Invented by us
'audio/x-dsf', // Informal
'application/x-ms-shortcut', // Informal, used by freedesktop.org. shared-mime-info
'application/x-ft-apple.alias',
'audio/x-voc',
'audio/vnd.dolby.dd-raw',
'audio/x-m4a',
Expand Down Expand Up @@ -330,10 +333,10 @@ export const mimeTypes = [
'application/x-ace-compressed',
'application/avro',
'application/vnd.iccprofile',
'application/x.autodesk.fbx', // Invented by us
'application/x-ft-fbx',
'application/vnd.visio',
'application/vnd.android.package-archive',
'application/vnd.google.draco', // Invented by us
'application/x-ft-draco',
'application/x-lz4', // Invented by us
'application/vnd.openxmlformats-officedocument.presentationml.template',
'application/vnd.openxmlformats-officedocument.spreadsheetml.template',
Expand Down