Make ResetValue unconstructable.

Author: taeold

src/common/options.ts

@@ -22,15 +22,21 @@
 
 /**
  * Special configuration type to reset configuration to platform default.
+ *
  * @alpha
  */
 export class ResetValue {
   toJSON(): null {
     return null;
   }
+  // eslint-disable-next-line @typescript-eslint/no-empty-function
+  private constructor() {}
+  public static getInstance() {
+    return new ResetValue();
+  }
 }
 
 /**
  * Special configuration value to reset configuration to platform default.
  */
-export const RESET_VALUE = new ResetValue();
+export const RESET_VALUE = ResetValue.getInstance();

src/v1/function-configuration.ts

@@ -1,7 +1,7 @@
 import { Expression } from "../params";
 import { ResetValue } from "../common/options";
 
-export { RESET_VALUE, ResetValue } from "../common/options";
+export { RESET_VALUE } from "../common/options";
 
 /**
  * List of all regions supported by Cloud Functions.

src/v2/options.ts

@@ -33,7 +33,7 @@ import { ParamSpec } from "../params/types";
 import { HttpsOptions } from "./providers/https";
 import * as logger from "../logger";
 
-export { RESET_VALUE, ResetValue } from "../common/options";
+export { RESET_VALUE } from "../common/options";
 
 /**
  * List of all regions supported by Cloud Functions v2