File: contextualTypeSelfReferencing.types

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//// [tests/cases/compiler/contextualTypeSelfReferencing.ts] ////

=== contextualTypeSelfReferencing.ts ===
// repro from https://github.com/microsoft/TypeScript/issues/54048

type narrow<def> = def extends string
>narrow : narrow<def>

  ? def
  : def extends [unknown, ...unknown[]]
  ? def
  : {
      [k in keyof def]: narrow<def[k]>;
    };

declare const parse: <def>(def: narrow<def>) => def;
>parse : <def>(def: narrow<def>) => def
>def : narrow<def>

const result = parse([{ a: "foo" }]);
>result : [{ a: "foo"; }]
>parse([{ a: "foo" }]) : [{ a: "foo"; }]
>parse : <def>(def: narrow<def>) => def
>[{ a: "foo" }] : [{ a: "foo"; }]
>{ a: "foo" } : { a: "foo"; }
>a : "foo"
>"foo" : "foo"