AutoComplete for string literal types fails when the type union contains a generic <string>

[bd82]

Description:

When a string literal type union also includes the general string type.
content assists stops working in VSCode (and the playground).

Code to reproduce the issue:

  function define(deps: depItemOrString[], Function) {}
  type depItemOrString = string | "ima/aba/bamba" | "winter/is/coming" | "there/can/be/only/one";

  // Intelli-sense for the string literals does **not** work here.
  define(["bamba"], () => {})

  function define2(deps: depItem[], Function) {}
  type depItem =  "ima/aba/bamba" | "winter/is/coming" | "there/can/be/only/one";

  // Everything works perfectly when the literal type union does not include a "general" string type.
  define2(["ima/aba/bamba"], () => {})

Try this code in the Playground

Expected Behavior

I would expect that in both function (define and define2) auto-complete suggestion
would be provided based on the literal string union type.

Actual Behavior

The auto-complete suggestions are only provided for a "pure" string literal type.
Meaning one that does not include a "generic" string as well:

type pureLiteralStringType = "a" | "b" | "c"
type impureLiteralStringType = string | "a" | "b" | "c"

[jack-williams]

Duplicate of #29729

[bd82]

Oh sorry I will close this.