Default args and locals params in debugger snapshot hooks

Allow the build plugin to omit empty args/locals arguments from
$dd_entry, $dd_return, and $dd_throw calls by defaulting the
parameters to {} in onEntry, onReturn, and onThrow.

Author: watson

packages/debugger/src/domain/api.ts

@@ -39,7 +39,7 @@ export function resetDebuggerTransport(): void {
  * @param self - The 'this' context
  * @param args - Function arguments
  */
-export function onEntry(probes: InitializedProbe[], self: any, args: Record<string, any>): void {
+export function onEntry(probes: InitializedProbe[], self: any, args: Record<string, any> = {}): void {
   const start = performance.now()
 
   // TODO: A lot of repeated work performed for each probe that could be shared between probes
@@ -114,8 +114,8 @@ export function onReturn(
   probes: InitializedProbe[],
   value: any,
   self: any,
-  args: Record<string, any>,
-  locals: Record<string, any>
+  args: Record<string, any> = {},
+  locals: Record<string, any> = {}
 ): any {
   const end = performance.now()
 
@@ -180,7 +180,7 @@ export function onReturn(
  * @param self - The 'this' context
  * @param args - Function arguments
  */
-export function onThrow(probes: InitializedProbe[], error: Error, self: any, args: Record<string, any>): void {
+export function onThrow(probes: InitializedProbe[], error: Error, self: any, args: Record<string, any> = {}): void {
   const end = performance.now()
 
   // TODO: A lot of repeated work performed for each probe that could be shared between probes