This repo is a minimalist testcase reproducing a bug with TypeScript's type inference for tuples: microsoft/TypeScript#32761

The bug doesn't happen on the TypeScript playground, only with actual files.

To reproduce, run:

node_modules/.bin/tsc --lib esnext hello.ts

Observed: error TS2345: Argument of type '(string | number)[][]' is not assignable to parameter of type 'Iterable<[string | number, string | number]>'.

Expected: x is inferred to be of type MyOrderedMap<number, string>, just like happens on the TypeScript playground, e.g. go to this URL and try hovering over the x:

https://www.typescriptlang.org/play/index.html#code/CYUwxgNghgTiAEAzArgOzAFwJYHtXwFkBPAeRlDmAKgAcAeAaQBp4A1APgAowcIJxseAFzwAkhhAwoAI350A2szYBddgEoRxMhRBVajFhwDcAKFCRYCLKgkxEUMAi3lJu6vSUd4IAB4TUwADOhPqe7PAA3ibw8HBQwHgQRPCBWABeICKoyAC20pKmAL4mJvwY8D7wALyEpC6U7pzy8gCMLADkUO3KympGQA

I have reproduced this with TypeScript versions:

• 3.5.1, which is what the Playground reports it's running
• 3.5.3, which is typescript@latest as of this writing
• 3.6.0-beta, which is typescript@beta as of this writing
• 3.6.0-dev.20190808, which is typescript@next as of this writing