avoid unnecessary undefined default value

lib/__test__/dsl-descriptor.test.ts

@@ -19,7 +19,9 @@ test("Restaurant Description", async () => {
       "\t// The current restaurant\n" +
       "\tstatic Restaurant current();\n" +
       "\t// Book a table for a given date time\n" +
-      "\tvoid book(dateTime: DateTime? = DateTime.today());\n" +
+      "\tvoid book(dateTime: DateTime? = `DateTime.today()`);\n" +
+      "\t// Book numbers tables for a given date time\n" +
+      "\tvoid bookTable(dateTime: DateTime?, number: int?);\n" +
       "}"
   );
 });

lib/__test__/example_descriptor.ts

@@ -592,6 +592,18 @@ export class Restaurant extends DataClass {
     recentBooking = `${this.name} is booking for ${dateTime.toString()}`;
   }
 
+  @GenieFunction("Book numbers tables for a given date time")
+  bookTable({ dateTime = undefined, number }: { dateTime?: DateTime, number?: int }): void {
+    if (dateTime === undefined) {
+      dateTime = DateTime.today();
+    }
+    if (number === undefined) {
+      number = 1;
+    }
+    console.log(`${this.name} is booking ${number} tables for ${dateTime.toString()}`);
+    recentBooking = `${this.name} is booking ${number} tables for ${dateTime.toString()}`;
+  }
+
   @GenieKey
   @GenieProperty("Name of the restaurant")
   public name: string;
@@ -661,6 +673,16 @@ export class Restaurant extends DataClass {
         false,
         "Book a table for a given date time"
       ),
+      new FuncDescriptor(
+        "bookTable",
+        [
+          new ParamDescriptor("dateTime", "DateTime", false, null),
+          new ParamDescriptor("number", "int", false, null)
+        ],
+        "void",
+        false,
+        "Book numbers tables for a given date time"
+      ),
     ],
     [
       new FieldDescriptor("name", "string", false),

lib/decorators/decorators.ts

@@ -620,7 +620,10 @@ export function GenieFunction(comment: string = "") {
         const paramValueObj = destructingParamValues[0];
         parameters = Object.keys(paramTypeObj).map((paramName) => {
           const paramType = classToName(paramTypeObj[paramName].type);
-          const paramValue = paramValueObj[paramName];
+          let paramValue = paramValueObj[paramName];
+          if (paramValue === undefined || paramValue === "undefined") {
+            paramValue = null;
+          }
           const paramOptional = paramTypeObj[paramName].optional;
           return new ParamDescriptor(paramName, paramType, !paramOptional, paramValue);
         });

lib/dsl-descriptor.ts

@@ -126,12 +126,12 @@ export class ParamDescriptor {
     public name: string,
     public type: string,
     public required: boolean = true,
-    public defaultValue?: any
+    public defaultValue: any = null
   ) {}
   description(): string {
     return (
       `${this.name}: ${this.type}` + (this.required ? "" : "?") +
-      (this.defaultValue ? ` = ${this.defaultValue}` : "")
+      (this.defaultValue ? ` = \`${this.defaultValue}\`` : "")
     );
   }
 }

package.json

@@ -1,6 +1,6 @@
 {
     "name": "reactgenie-dsl",
-    "version": "0.0.40",
+    "version": "0.0.41",
     "description": "A natural language parser based on a large language model",
     "scripts": {
         "prepare": "peggy lib/dsl/parser.pegjs -o lib/dsl/parser.gen.js && tsc",