TextEncoder and TextDecoder missing from Window object

[Mischala]

consider the following:

export const main = () => {
  const encoder1 = new window.TextEncoder();
  const encoder2 = new TextEncoder();

  const decoder1 = new window.TextDecoder();
  const decoder2 = new TextDecoder();
}

new TextDecoder and new window.TextDecoder should both be valid, and in fact are on all browsers tested, except notably, Edge and IE.
But, TextEncoder and TextDecoder are not defined on the Window type.

[Mischala]

#664

[saschanaz]

@github-actions close

[github-actions]

Closing because @saschanaz is one of the code-owners of this repository.