Simple but can help

destructureMIME.js

// https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/MIME_types
// you can return an array instead of an object
function getDataFromMIME(mime) {
  const [type, subtype, parameter] = mime.split(/[\/\;]/);
  const [paramName, paramValue] = parameter.split('=');
  return {
    type,
    subtype,
    [paramName]: paramValue,
    parameter: [paramName, paramValue]
  };
}


const { type, subtype } = getDataFromMIME('video/mp4;ts=192378933');

console.log(`This file is a/an ${type} with the subtype ${subtype}`)