When interfaces are merged, always ensure that the parent symbol of the late bound member symbol is declared symbol containing the node.

Ensure that resolvedMembers adds the late bound symbol even when its resolved sunce lateBoundMember may or may not be added to resolved members depending on when its checked
Fixes microsoft#30891

Author: sheetalkamat

src/compiler/checker.ts

@@ -6607,12 +6607,11 @@ namespace ts {
          * unique symbol type which we can then use as the name of the member. This allows users
          * to define custom symbols that can be used in the members of an object type.
          *
-         * @param parent The containing symbol for the member.
          * @param earlySymbols The early-bound symbols of the parent.
          * @param lateSymbols The late-bound symbols of the parent.
          * @param decl The member to bind.
          */
-        function lateBindMember(parent: Symbol, earlySymbols: SymbolTable | undefined, lateSymbols: SymbolTable, decl: LateBoundDeclaration) {
+        function lateBindMember(earlySymbols: SymbolTable | undefined, lateSymbols: SymbolTable, decl: LateBoundDeclaration) {
             Debug.assert(!!decl.symbol, "The member is expected to have a symbol.");
             const links = getNodeLinks(decl);
             if (!links.resolvedSymbol) {
@@ -6643,6 +6642,7 @@ namespace ts {
                     }
                     lateSymbol.nameType = type;
                     addDeclarationToLateBoundSymbol(lateSymbol, decl, symbolFlags);
+                    const parent = getSymbolOfNode(decl.parent);
                     if (lateSymbol.parent) {
                         Debug.assert(lateSymbol.parent === parent, "Existing symbol parent should match new one");
                     }
@@ -6652,6 +6652,15 @@ namespace ts {
                     return links.resolvedSymbol = lateSymbol;
                 }
             }
+            else {
+                const type = checkComputedPropertyName(decl.name);
+                if (isTypeUsableAsPropertyName(type)) {
+                    const memberName = getPropertyNameFromType(type);
+                    if (!lateSymbols.has(memberName)) {
+                        lateSymbols.set(memberName, links.resolvedSymbol);
+                    }
+                }
+            }
             return links.resolvedSymbol;
         }
 
@@ -6675,7 +6684,7 @@ namespace ts {
                     if (members) {
                         for (const member of members) {
                             if (isStatic === hasStaticModifier(member) && hasLateBindableName(member)) {
-                                lateBindMember(symbol, earlySymbols, lateSymbols, member);
+                                lateBindMember(earlySymbols, lateSymbols, member);
                             }
                         }
                     }

tests/baselines/reference/tsbuild/lateBoundSymbol/incremental-declaration-doesnt-change/interface-is-merged-and-contains-late-bound-member.js

@@ -1,3 +1,9 @@
+//// [/src/src/main.js]
+"use strict";
+exports.__esModule = true;
+var sym = Symbol();
+
+
 //// [/src/src/main.ts]
 import { HKT } from "./hkt";
 
@@ -11,3 +17,97 @@ declare module "./hkt" {
 
 type A = HKT<number>[typeof sym];
 
+//// [/src/tsconfig.tsbuildinfo]
+{
+  "program": {
+    "fileInfos": {
+      "/lib/lib.es5.d.ts": {
+        "version": "/lib/lib.es5.d.ts",
+        "signature": "/lib/lib.es5.d.ts"
+      },
+      "/lib/lib.es2015.d.ts": {
+        "version": "/lib/lib.es2015.d.ts",
+        "signature": "/lib/lib.es2015.d.ts"
+      },
+      "/lib/lib.es2015.core.d.ts": {
+        "version": "/lib/lib.es2015.core.d.ts",
+        "signature": "/lib/lib.es2015.core.d.ts"
+      },
+      "/lib/lib.es2015.collection.d.ts": {
+        "version": "/lib/lib.es2015.collection.d.ts",
+        "signature": "/lib/lib.es2015.collection.d.ts"
+      },
+      "/lib/lib.es2015.generator.d.ts": {
+        "version": "/lib/lib.es2015.generator.d.ts",
+        "signature": "/lib/lib.es2015.generator.d.ts"
+      },
+      "/lib/lib.es2015.iterable.d.ts": {
+        "version": "/lib/lib.es2015.iterable.d.ts",
+        "signature": "/lib/lib.es2015.iterable.d.ts"
+      },
+      "/lib/lib.es2015.promise.d.ts": {
+        "version": "/lib/lib.es2015.promise.d.ts",
+        "signature": "/lib/lib.es2015.promise.d.ts"
+      },
+      "/lib/lib.es2015.proxy.d.ts": {
+        "version": "/lib/lib.es2015.proxy.d.ts",
+        "signature": "/lib/lib.es2015.proxy.d.ts"
+      },
+      "/lib/lib.es2015.reflect.d.ts": {
+        "version": "/lib/lib.es2015.reflect.d.ts",
+        "signature": "/lib/lib.es2015.reflect.d.ts"
+      },
+      "/lib/lib.es2015.symbol.d.ts": {
+        "version": "/lib/lib.es2015.symbol.d.ts",
+        "signature": "/lib/lib.es2015.symbol.d.ts"
+      },
+      "/lib/lib.es2015.symbol.wellknown.d.ts": {
+        "version": "/lib/lib.es2015.symbol.wellknown.d.ts",
+        "signature": "/lib/lib.es2015.symbol.wellknown.d.ts"
+      },
+      "/src/src/hkt.ts": {
+        "version": "675797797",
+        "signature": "2373810515"
+      },
+      "/src/src/main.ts": {
+        "version": "-27494779858",
+        "signature": "-7779857705"
+      }
+    },
+    "options": {
+      "rootDir": "/src/src",
+      "lib": [
+        "lib.es2015.d.ts"
+      ],
+      "incremental": true,
+      "configFilePath": "/src/tsconfig.json"
+    },
+    "referencedMap": {
+      "/src/src/main.ts": [
+        "/src/src/hkt.ts"
+      ]
+    },
+    "exportedModulesMap": {
+      "/src/src/main.ts": [
+        "/src/src/hkt.ts"
+      ]
+    },
+    "semanticDiagnosticsPerFile": [
+      "/lib/lib.es2015.collection.d.ts",
+      "/lib/lib.es2015.core.d.ts",
+      "/lib/lib.es2015.d.ts",
+      "/lib/lib.es2015.generator.d.ts",
+      "/lib/lib.es2015.iterable.d.ts",
+      "/lib/lib.es2015.promise.d.ts",
+      "/lib/lib.es2015.proxy.d.ts",
+      "/lib/lib.es2015.reflect.d.ts",
+      "/lib/lib.es2015.symbol.d.ts",
+      "/lib/lib.es2015.symbol.wellknown.d.ts",
+      "/lib/lib.es5.d.ts",
+      "/src/src/hkt.ts",
+      "/src/src/main.ts"
+    ]
+  },
+  "version": "FakeTSVersion"
+}
+