Array.from is an ES6 feature. When I use it in TypeScript and compile to ES5 target it does not change it:

tsc -t es5 prog.ts

i.e. when I look inside prog.js I still see Array.from in the same place. Using prog.js in IE11 complains as follows:

Object doesn't support property or method 'from'

Why doesn't TypeScript convert Array.from in to some ES5 alternative?

Is there a way to set it up so it does?