Add test for already fixed issue 49778 (#52668)

tests/baselines/reference/relatedViaDiscriminatedTypeNoError2.js

@@ -0,0 +1,17 @@
+//// [relatedViaDiscriminatedTypeNoError2.ts]
+type AObjOrBObj = { name: "A" } | { name: "B" };
+type AOrBObj = { name: "A" | "B" };
+type Generic<T extends AObjOrBObj> = T;
+
+type T = Generic<AOrBObj>;
+
+declare let x: AObjOrBObj;
+declare let y: AOrBObj;
+x = y;
+y = x;
+
+
+//// [relatedViaDiscriminatedTypeNoError2.js]
+"use strict";
+x = y;
+y = x;

tests/baselines/reference/relatedViaDiscriminatedTypeNoError2.symbols

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+=== tests/cases/compiler/relatedViaDiscriminatedTypeNoError2.ts ===
+type AObjOrBObj = { name: "A" } | { name: "B" };
+>AObjOrBObj : Symbol(AObjOrBObj, Decl(relatedViaDiscriminatedTypeNoError2.ts, 0, 0))
+>name : Symbol(name, Decl(relatedViaDiscriminatedTypeNoError2.ts, 0, 19))
+>name : Symbol(name, Decl(relatedViaDiscriminatedTypeNoError2.ts, 0, 35))
+
+type AOrBObj = { name: "A" | "B" };
+>AOrBObj : Symbol(AOrBObj, Decl(relatedViaDiscriminatedTypeNoError2.ts, 0, 48))
+>name : Symbol(name, Decl(relatedViaDiscriminatedTypeNoError2.ts, 1, 16))
+
+type Generic<T extends AObjOrBObj> = T;
+>Generic : Symbol(Generic, Decl(relatedViaDiscriminatedTypeNoError2.ts, 1, 35))
+>T : Symbol(T, Decl(relatedViaDiscriminatedTypeNoError2.ts, 2, 13))
+>AObjOrBObj : Symbol(AObjOrBObj, Decl(relatedViaDiscriminatedTypeNoError2.ts, 0, 0))
+>T : Symbol(T, Decl(relatedViaDiscriminatedTypeNoError2.ts, 2, 13))
+
+type T = Generic<AOrBObj>;
+>T : Symbol(T, Decl(relatedViaDiscriminatedTypeNoError2.ts, 2, 39))
+>Generic : Symbol(Generic, Decl(relatedViaDiscriminatedTypeNoError2.ts, 1, 35))
+>AOrBObj : Symbol(AOrBObj, Decl(relatedViaDiscriminatedTypeNoError2.ts, 0, 48))
+
+declare let x: AObjOrBObj;
+>x : Symbol(x, Decl(relatedViaDiscriminatedTypeNoError2.ts, 6, 11))
+>AObjOrBObj : Symbol(AObjOrBObj, Decl(relatedViaDiscriminatedTypeNoError2.ts, 0, 0))
+
+declare let y: AOrBObj;
+>y : Symbol(y, Decl(relatedViaDiscriminatedTypeNoError2.ts, 7, 11))
+>AOrBObj : Symbol(AOrBObj, Decl(relatedViaDiscriminatedTypeNoError2.ts, 0, 48))
+
+x = y;
+>x : Symbol(x, Decl(relatedViaDiscriminatedTypeNoError2.ts, 6, 11))
+>y : Symbol(y, Decl(relatedViaDiscriminatedTypeNoError2.ts, 7, 11))
+
+y = x;
+>y : Symbol(y, Decl(relatedViaDiscriminatedTypeNoError2.ts, 7, 11))
+>x : Symbol(x, Decl(relatedViaDiscriminatedTypeNoError2.ts, 6, 11))
+

tests/baselines/reference/relatedViaDiscriminatedTypeNoError2.types

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+=== tests/cases/compiler/relatedViaDiscriminatedTypeNoError2.ts ===
+type AObjOrBObj = { name: "A" } | { name: "B" };
+>AObjOrBObj : { name: "A"; } | { name: "B"; }
+>name : "A"
+>name : "B"
+
+type AOrBObj = { name: "A" | "B" };
+>AOrBObj : { name: "A" | "B"; }
+>name : "A" | "B"
+
+type Generic<T extends AObjOrBObj> = T;
+>Generic : T
+
+type T = Generic<AOrBObj>;
+>T : AOrBObj
+
+declare let x: AObjOrBObj;
+>x : AObjOrBObj
+
+declare let y: AOrBObj;
+>y : AOrBObj
+
+x = y;
+>x = y : AOrBObj
+>x : AObjOrBObj
+>y : AOrBObj
+
+y = x;
+>y = x : AObjOrBObj
+>y : AOrBObj
+>x : AObjOrBObj
+

tests/cases/compiler/relatedViaDiscriminatedTypeNoError2.ts

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+// @strict: true
+type AObjOrBObj = { name: "A" } | { name: "B" };
+type AOrBObj = { name: "A" | "B" };
+type Generic<T extends AObjOrBObj> = T;
+
+type T = Generic<AOrBObj>;
+
+declare let x: AObjOrBObj;
+declare let y: AOrBObj;
+x = y;
+y = x;