Add test case from PR 56046

Co-authored-by: Wesley Wigham <[email protected]>

Author: jakebailey

tests/baselines/reference/declarationEmitReusesLambdaParameterNodes.js

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+//// [tests/cases/compiler/declarationEmitReusesLambdaParameterNodes.ts] ////
+
+//// [index.d.ts]
+export type Whatever = {x: string, y: number};
+export type Props<T, TThing = Whatever> = Omit<TThing, "y"> & Partial<TThing> & T;
+
+//// [index.ts]
+import { Props } from "react-select";
+
+export const CustomSelect1 = <Option,>(x: Props<Option> & {}) => {}
+export function CustomSelect2<Option,>(x: Props<Option> & {}) {}
+
+
+//// [index.js]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.CustomSelect2 = exports.CustomSelect1 = void 0;
+var CustomSelect1 = function (x) { };
+exports.CustomSelect1 = CustomSelect1;
+function CustomSelect2(x) { }
+exports.CustomSelect2 = CustomSelect2;
+
+
+//// [index.d.ts]
+import { Props } from "react-select";
+export declare const CustomSelect1: <Option>(x: Props<Option> & {}) => void;
+export declare function CustomSelect2<Option>(x: Props<Option> & {}): void;

tests/baselines/reference/declarationEmitReusesLambdaParameterNodes.symbols

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+//// [tests/cases/compiler/declarationEmitReusesLambdaParameterNodes.ts] ////
+
+=== node_modules/react-select/index.d.ts ===
+export type Whatever = {x: string, y: number};
+>Whatever : Symbol(Whatever, Decl(index.d.ts, 0, 0))
+>x : Symbol(x, Decl(index.d.ts, 0, 24))
+>y : Symbol(y, Decl(index.d.ts, 0, 34))
+
+export type Props<T, TThing = Whatever> = Omit<TThing, "y"> & Partial<TThing> & T;
+>Props : Symbol(Props, Decl(index.d.ts, 0, 46))
+>T : Symbol(T, Decl(index.d.ts, 1, 18))
+>TThing : Symbol(TThing, Decl(index.d.ts, 1, 20))
+>Whatever : Symbol(Whatever, Decl(index.d.ts, 0, 0))
+>Omit : Symbol(Omit, Decl(lib.es5.d.ts, --, --))
+>TThing : Symbol(TThing, Decl(index.d.ts, 1, 20))
+>Partial : Symbol(Partial, Decl(lib.es5.d.ts, --, --))
+>TThing : Symbol(TThing, Decl(index.d.ts, 1, 20))
+>T : Symbol(T, Decl(index.d.ts, 1, 18))
+
+=== index.ts ===
+import { Props } from "react-select";
+>Props : Symbol(Props, Decl(index.ts, 0, 8))
+
+export const CustomSelect1 = <Option,>(x: Props<Option> & {}) => {}
+>CustomSelect1 : Symbol(CustomSelect1, Decl(index.ts, 2, 12))
+>Option : Symbol(Option, Decl(index.ts, 2, 30))
+>x : Symbol(x, Decl(index.ts, 2, 39))
+>Props : Symbol(Props, Decl(index.ts, 0, 8))
+>Option : Symbol(Option, Decl(index.ts, 2, 30))
+
+export function CustomSelect2<Option,>(x: Props<Option> & {}) {}
+>CustomSelect2 : Symbol(CustomSelect2, Decl(index.ts, 2, 67))
+>Option : Symbol(Option, Decl(index.ts, 3, 30))
+>x : Symbol(x, Decl(index.ts, 3, 39))
+>Props : Symbol(Props, Decl(index.ts, 0, 8))
+>Option : Symbol(Option, Decl(index.ts, 3, 30))
+

tests/baselines/reference/declarationEmitReusesLambdaParameterNodes.types

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+//// [tests/cases/compiler/declarationEmitReusesLambdaParameterNodes.ts] ////
+
+=== node_modules/react-select/index.d.ts ===
+export type Whatever = {x: string, y: number};
+>Whatever : { x: string; y: number; }
+>x : string
+>y : number
+
+export type Props<T, TThing = Whatever> = Omit<TThing, "y"> & Partial<TThing> & T;
+>Props : Props<T, TThing>
+
+=== index.ts ===
+import { Props } from "react-select";
+>Props : any
+
+export const CustomSelect1 = <Option,>(x: Props<Option> & {}) => {}
+>CustomSelect1 : <Option>(x: Omit<import("node_modules/react-select/index").Whatever, "y"> & Partial<import("node_modules/react-select/index").Whatever> & Option) => void
+><Option,>(x: Props<Option> & {}) => {} : <Option>(x: Omit<import("node_modules/react-select/index").Whatever, "y"> & Partial<import("node_modules/react-select/index").Whatever> & Option) => void
+>x : Omit<import("node_modules/react-select/index").Whatever, "y"> & Partial<import("node_modules/react-select/index").Whatever> & Option
+
+export function CustomSelect2<Option,>(x: Props<Option> & {}) {}
+>CustomSelect2 : <Option>(x: Props<Option> & {}) => void
+>x : Omit<import("node_modules/react-select/index").Whatever, "y"> & Partial<import("node_modules/react-select/index").Whatever> & Option
+

tests/cases/compiler/declarationEmitReusesLambdaParameterNodes.ts

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+// @strict: true
+// @declaration: true
+// @module: nodenext
+// @filename: node_modules/react-select/index.d.ts
+export type Whatever = {x: string, y: number};
+export type Props<T, TThing = Whatever> = Omit<TThing, "y"> & Partial<TThing> & T;
+
+// @filename: index.ts
+import { Props } from "react-select";
+
+export const CustomSelect1 = <Option,>(x: Props<Option> & {}) => {}
+export function CustomSelect2<Option,>(x: Props<Option> & {}) {}