javascript - How to modify a File's type property? -


so no surprise browsers have different list of recognised mime types.

see embedded screenshot of pen.

browser comparison

all browsers except chrome have supplied file object type set audio/mpeg.

in case of chrome type empty string ''.

this makes client side validation of file types accepted pain deal with. (especially in context when allowed quite 'open' video/* or audio/* files.

i want polyfill type on file object when comes blank in browsers. allow me more consistently validate whether file of allowed types.

however, type attribute on file read-only. cannot modified.

is there way bypass limitation?

such creating copy of file object , overriding type?

i ended solving following.

let polyfillmimetype (let = 0; < $newfiles.length; i++) {   if (!$newfiles[i].type) {     polyfillmimetype = mimetype.lookup($newfiles[i].name)     $newfiles[i] = new window.file([$newfiles[i]], $newfiles[i].name, { type: polyfillmimetype })   } }

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