Add test

Author: jakebailey

tests/baselines/reference/typeNamedUndefined.js

@@ -0,0 +1,30 @@
+//// [tests/cases/compiler/typeNamedUndefined.ts] ////
+
+//// [typeNamedUndefined.ts]
+export namespace ns {
+    const s = Symbol();
+    export type undefined = typeof s;
+    export function x(p: undefined): undefined { // global undefined
+        return p;
+    }
+}
+
+export function x(p: ns.undefined) { // undefined from the namespace
+    return p;
+}
+
+export type undefined = "";
+
+
+//// [typeNamedUndefined.js]
+export var ns;
+(function (ns) {
+    const s = Symbol();
+    function x(p) {
+        return p;
+    }
+    ns.x = x;
+})(ns || (ns = {}));
+export function x(p) {
+    return p;
+}

tests/baselines/reference/typeNamedUndefined.symbols

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+//// [tests/cases/compiler/typeNamedUndefined.ts] ////
+
+=== typeNamedUndefined.ts ===
+export namespace ns {
+>ns : Symbol(ns, Decl(typeNamedUndefined.ts, 0, 0))
+
+    const s = Symbol();
+>s : Symbol(s, Decl(typeNamedUndefined.ts, 1, 9))
+>Symbol : Symbol(Symbol, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2019.symbol.d.ts, --, --))
+
+    export type undefined = typeof s;
+>undefined : Symbol(undefined, Decl(typeNamedUndefined.ts, 1, 23))
+>s : Symbol(s, Decl(typeNamedUndefined.ts, 1, 9))
+
+    export function x(p: undefined): undefined { // global undefined
+>x : Symbol(x, Decl(typeNamedUndefined.ts, 2, 37))
+>p : Symbol(p, Decl(typeNamedUndefined.ts, 3, 22))
+
+        return p;
+>p : Symbol(p, Decl(typeNamedUndefined.ts, 3, 22))
+    }
+}
+
+export function x(p: ns.undefined) { // undefined from the namespace
+>x : Symbol(x, Decl(typeNamedUndefined.ts, 6, 1))
+>p : Symbol(p, Decl(typeNamedUndefined.ts, 8, 18))
+>ns : Symbol(ns, Decl(typeNamedUndefined.ts, 0, 0))
+>undefined : Symbol(ns.undefined, Decl(typeNamedUndefined.ts, 1, 23))
+
+    return p;
+>p : Symbol(p, Decl(typeNamedUndefined.ts, 8, 18))
+}
+
+export type undefined = "";
+>undefined : Symbol(undefined, Decl(typeNamedUndefined.ts, 10, 1))
+

tests/baselines/reference/typeNamedUndefined.types

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+//// [tests/cases/compiler/typeNamedUndefined.ts] ////
+
+=== typeNamedUndefined.ts ===
+export namespace ns {
+>ns : typeof ns
+
+    const s = Symbol();
+>s : unique symbol
+>Symbol() : unique symbol
+>Symbol : SymbolConstructor
+
+    export type undefined = typeof s;
+>undefined : unique symbol
+>s : unique symbol
+
+    export function x(p: undefined): undefined { // global undefined
+>x : (p: undefined) => undefined
+>p : undefined
+
+        return p;
+>p : undefined
+    }
+}
+
+export function x(p: ns.undefined) { // undefined from the namespace
+>x : (p: ns.undefined) => symbol
+>p : unique symbol
+>ns : any
+
+    return p;
+>p : unique symbol
+}
+
+export type undefined = "";
+>undefined : ""
+

tests/cases/compiler/typeNamedUndefined.ts

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+// @strict: true
+// @target: esnext
+// @lib: esnext
+
+export namespace ns {
+    const s = Symbol();
+    export type undefined = typeof s;
+    export function x(p: undefined): undefined { // global undefined
+        return p;
+    }
+}
+
+export function x(p: ns.undefined) { // undefined from the namespace
+    return p;
+}
+
+export type undefined = "";