fix(dts-generator): support rest parameters in functions in nested types

When api.json contains:
Object<string,function(...any)>|function

Then the d.ts file will contain:
Record<string, (...p1: any) => void> | Function;

Before this fix, the function had no parameter.

Author: akudev

packages/dts-generator/src/phases/dts-code-gen.ts

@@ -873,7 +873,7 @@ function genType(ast: Type, usage: string = "unknown"): string {
       if (!_.isEmpty(ast.typeParameters)) {
         text += `<${_.map(ast.typeParameters, (param) => param.name).join(", ")}>`; // TODO defaults, constraints, expressions
       }
-      text += `(${_.map(ast.parameters, (param) => `${param.name}${param.optional ? "?" : ""}: ${genType(param.type, "parameter")}`).join(", ")})`;
+      text += `(${_.map(ast.parameters, (param) => `${param.type?.repeatable ? "..." : ""}${param.name}${param.optional ? "?" : ""}: ${genType(param.type, "parameter")}`).join(", ")})`;
       text += ` => ${ast.type ? genType(ast.type, "returnValue") : "void"}`;
       return text;
     case "NativeTSTypeExpression":

test-packages/openui5-snapshot-test/input-sdk/sap.ui.core.api.json

@@ -110776,14 +110776,14 @@
         },
         {
           "name": "actions",
-          "type": "Object<string,function()>|function",
+          "type": "Object<string,function(...any)>|function",
           "optional": true,
           "visibility": "public",
           "description": "A map or a class of functions that can be used as arrangement or action in Opa tests. Only the test decides whether a function is used as arrangement or action. Each function typically contains one or multiple <code>waitFor</code> statements."
         },
         {
           "name": "assertions",
-          "type": "Object<string,function()>|function",
+          "type": "Object<string,function(...any)>|function",
           "optional": true,
           "visibility": "public",
           "description": "A map or a class of functions that can be used as assertions in Opa tests."

test-packages/openui5-snapshot-test/output-dts/sap.ui.core.d.ts

@@ -83938,11 +83938,11 @@ declare module "sap/ui/test/Opa5" {
      * whether a function is used as arrangement or action. Each function typically contains one or multiple
      * `waitFor` statements.
      */
-    actions?: Record<string, () => void> | Function;
+    actions?: Record<string, (...p1: any) => void> | Function;
     /**
      * A map or a class of functions that can be used as assertions in Opa tests.
      */
-    assertions?: Record<string, () => void> | Function;
+    assertions?: Record<string, (...p1: any) => void> | Function;
   };
 }