fix: Resolve the name of parameters referring to default exports

src/lib/models/types.ts

@@ -907,11 +907,39 @@ export class ReferenceType extends Type {
         return new ReferenceType(name, target, project, name);
     }
 
+    /**
+     * In certain cases, TypeScript returns the name `default` for the name of a type that is defined with
+     * the format `export default class` or `export default function`. This method checks for that case and returns the
+     * declaration of the export instead of the name `default`.
+     */
+    private static getNameForDefaultExport(
+        symbol: ts.Symbol,
+    ): string | undefined {
+        if (
+            symbol.name !== "default" ||
+            symbol.valueDeclaration === undefined
+        ) {
+            return;
+        }
+
+        const name = ts.getNameOfDeclaration(symbol.valueDeclaration);
+
+        if (!name) {
+            return;
+        }
+
+        if (ts.isIdentifier(name)) {
+            return name.text;
+        }
+    }
+
     static createSymbolReference(
         symbol: ts.Symbol,
         context: Context,
         name?: string,
     ) {
+        name ??= this.getNameForDefaultExport(symbol);
+
         const ref = new ReferenceType(
             name ?? symbol.name,
             new ReflectionSymbolId(symbol),

src/test/converter2/issues/gh2574/default.ts

@@ -0,0 +1,6 @@
+/**
+ * Default export and class implementation
+ */
+export default class DefaultExport {
+    constructor() {}
+}

src/test/converter2/issues/gh2574/index.ts

@@ -0,0 +1,3 @@
+import { Default } from "./reexported";
+
+export function usesDefaultExport(param: Default) {}

src/test/converter2/issues/gh2574/reexported.ts

@@ -0,0 +1 @@
+export { default as Default } from "./default";

src/test/issues.c2.test.ts

@@ -15,6 +15,7 @@ import {
     ProjectReflection,
     QueryType,
     ReferenceReflection,
+    ReferenceType,
     ReflectionKind,
     ReflectionType,
     SignatureReflection,
@@ -91,6 +92,21 @@ describe("Issue Tests", () => {
         );
     });
 
+    it("#2574", () => {
+        const project = convert();
+        const usesDefaultExport = query(project, "usesDefaultExport");
+        const sig = usesDefaultExport.signatures?.[0];
+        ok(sig, "Missing signature for usesDefaultExport");
+        const param = sig.parameters?.[0];
+        ok(param, "Missing parameter");
+        equal(param.name, "param", "Incorrect parameter name");
+        const paramType = param.type as ReferenceType | undefined;
+        ok(paramType, "Parameter type is not a reference type or undefined");
+        equal(paramType.type, "reference", "Parameter is not a reference type");
+        equal(paramType.name, "DefaultExport", "Incorrect reference name");
+        equal(paramType.qualifiedName, "default", "Incorrect qualified name");
+    });
+
     it("#671", () => {
         const project = convert();
         const toNumber = query(project, "toNumber");