Cannot find name 'Iterable' when including ES2015.Promise

[ststeiger]

I've been using Promises (and async) in ES5 with TypeScript.
It used to work fine in TypeScript 3.1
However, after upgrading to TypeScript 3.8.3, I consistently get this error:

Cannot find name 'Iterable'

this sucks.
I can include "ES2015.Iterable", but that doesn't solve the problem.
Some stackoverflow post suggest adding "ES2015.Symbol", but that doesn't help either.
I can also just create an empty test.ts file, and i still get this error, although there is no code at all.
This seems to be a TypeScript issue.
Apparently, I cannot add ES2015.Proxy without adding ES2016.

As soon as I add ES2016, the error goes away.

Problem is, I still need to support Internet Exploder, so I cannot just add ES2016 there, since IE doesn't support it. ES2015.Promise is really all I want, so that I can change the code to async already.

Please fix this annoying bug.

{
  "compileOnSave": true,

  "compilerOptions": {
    "target": "ES5",
    "module": "None", // IE11...
    "lib": [
      "DOM",
      "ES5",
      // "ES2015.Proxy",
      // "ES2015.Iterable",
      "ES2015.Promise"
    ],

    "noImplicitAny": true,
    "noEmitOnError": true,
    "removeComments": true,
    "sourceMap": false,
    "outDir": "../../wwwroot/ts/Leaflet",
    "rootDir": "./",
    "allowUnreachableCode": true
  },
  "exclude": [
    "node_modules",
    "wwwroot"
  ],

  "include": [
    "**/*"
  ]

}

[MKRhere]

Internet Exploder

I hope that's intentional, and here's your upvote. You also have my sympathy.

[ststeiger]

@MKRhere: It is, and thanks ;)

[rbuckton]

This was fixed in #35998 (when we introduced awaited), and was kept in #37610 (when we reverted awaited), and has been fixed since 3.9.