Fix quick info for methods whose contextual type is a mapped type property (#33930)

Author: andrewbranch

src/services/symbolDisplay.ts

@@ -237,7 +237,7 @@ namespace ts.SymbolDisplay {
                 // get the signature from the declaration and write it
                 const functionDeclaration = <FunctionLike>location.parent;
                 // Use function declaration to write the signatures only if the symbol corresponding to this declaration
-                const locationIsSymbolDeclaration = find(symbol.declarations, declaration =>
+                const locationIsSymbolDeclaration = symbol.declarations && find(symbol.declarations, declaration =>
                     declaration === (location.kind === SyntaxKind.ConstructorKeyword ? functionDeclaration.parent : functionDeclaration));
 
                 if (locationIsSymbolDeclaration) {

tests/cases/fourslash/quickInfoMappedTypeMethods.ts

@@ -0,0 +1,9 @@
+/// <reference path="fourslash.ts" />
+// https://github.com/microsoft/TypeScript/issues/32983
+
+////type M = { [K in 'one']: any };
+////const x: M = {
+////  /**/one() {}
+////}
+
+verify.quickInfoAt("", "(property) one: any");