refactor: convert constructor parameter properties for erasableSyntaxOnly compatibility

Signed-off-by: Paul Schultz <pschultz@pobox.com>

packages/config-loader/src/sources/ObservableConfigProxy.ts

@@ -27,11 +27,18 @@ export class ObservableConfigProxy implements Config {
     return new ObservableConfigProxy(undefined, undefined, abortController);
   }
 
+  private readonly parent?: ObservableConfigProxy;
+  private readonly parentKey?: string;
+  private readonly abortController?: AbortController;
+
   private constructor(
-    private readonly parent?: ObservableConfigProxy,
-    private readonly parentKey?: string,
-    private readonly abortController?: AbortController,
+    parent?: ObservableConfigProxy,
+    parentKey?: string,
+    abortController?: AbortController,
   ) {
+    this.parent = parent;
+    this.parentKey = parentKey;
+    this.abortController = abortController;
     if (parent && !parentKey) {
       throw new Error('parentKey is required if parent is set');
     }

packages/config-loader/src/sources/StaticConfigSource.ts

@@ -37,10 +37,13 @@ export interface StaticConfigSourceOptions {
 
 /** @internal */
 class StaticObservableConfigSource implements ConfigSource {
-  constructor(
-    private readonly data: Observable<JsonObject>,
-    private readonly context: string,
-  ) {}
+  private readonly data: Observable<JsonObject>;
+  private readonly context: string;
+
+  constructor(data: Observable<JsonObject>, context: string) {
+    this.data = data;
+    this.context = context;
+  }
 
   async *readConfigData(
     options?: ReadConfigDataOptions | undefined,
@@ -131,10 +134,16 @@ export class StaticConfigSource implements ConfigSource {
     return new StaticConfigSource(data, context);
   }
 
+  private readonly promise: JsonObject | PromiseLike<JsonObject>;
+  private readonly context: string;
+
   private constructor(
-    private readonly promise: JsonObject | PromiseLike<JsonObject>,
-    private readonly context: string,
-  ) {}
+    promise: JsonObject | PromiseLike<JsonObject>,
+    context: string,
+  ) {
+    this.promise = promise;
+    this.context = context;
+  }
 
   async *readConfigData(): AsyncConfigSourceGenerator {
     yield { configs: [{ data: await this.promise, context: this.context }] };