Starting overload selection in signature help doesn't account for discriminating arguments

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TypeScript Version: 3.8.0-dev.20200201

Search Terms

• overload

Incorrect types sugestion with overload
https://gitlab.com/kamidere-laboratory/duat/tree/testy
overload is declarated in src/database/Controller.ts method create

• VSCode Version: 1.41.1
• OS Version: Windows_NT x64 10.0.18362

Steps to Reproduce:

1. Write Database.create(DatabaseType.Graphite, {}) // now we get Influx overload xD
2. Change DatabaseType.Graphite to DatabaseType.Sqlite // now we get Sqlite overload :D
3. Change back to DatabaseType.Graphite // now we still get Sqlite overload :(
   https://youtu.be/a7FHxIItceA

Does this issue occur when all extensions are disabled?: Yes

interface a {
  a: string;
  b: string;
  c: {
    a:number;
    b:string;
  }
}

interface b {
  a: string;
  b: string;
  c: {
    a: number;
    b: string;
    c: string[];
  }
}

interface c {
  a: string;
  b: string;
}

enum d {
  "A" = 'a',
  "B" = 'b',
  "C" = 'c',
}

class testClass {
  constructor(arg1: d, arg2: a | b | c) {
    console.log(arg1, arg2)
  }
  static doSomething(arg1: d.A, arg2: a): testClass;
  static doSomething(arg1: d.B, arg2: b): testClass;
  static doSomething(arg1: d.C, arg2: c): testClass;
  static doSomething(arg1: d, arg2: a | b | c): testClass {
    return new this(arg1, arg2);
  }
}

testClass.doSomething(d.C, {});

Commencez par reproduire l’exemple de surcharge dans l’issue et examinez la gestion de signature help de TypeScript pour la sélection des surcharges. Vérifiez le comportement lorsque le premier argument discriminant change entre des valeurs d’enum ; c’est terminé lorsque signature help sélectionne la surcharge correspondant à cet argument au lieu de conserver la surcharge précédemment sélectionnée.