improve description of emulator grpc error code mapping const

Author: stephenarosaj

src/data-connect/data-connect-api-client-internal.ts

@@ -25,7 +25,7 @@ import {
   FirebaseDataConnectError,
   DataConnectErrorCode,
   DATA_CONNECT_ERROR_CODE_MAPPING,
-  GRPC_STATUS_CODE_TO_STRING
+  EMULATOR_GRPC_STATUS_CODE_TO_STRING
 } from './error';
 import * as utils from '../utils/index';
 import * as validator from '../utils/validator';
@@ -421,7 +421,7 @@ export class DataConnectApiClient {
 
     let status = error.status;
     if (!status && validator.isNumber(error.code)) {
-      status = GRPC_STATUS_CODE_TO_STRING[error.code as number];
+      status = EMULATOR_GRPC_STATUS_CODE_TO_STRING[error.code as number];
     }
 
     let code: DataConnectErrorCode = DATA_CONNECT_ERROR_CODE_MAPPING.UNKNOWN;

src/data-connect/error.ts

@@ -71,10 +71,12 @@ export class FirebaseDataConnectError extends FirebaseError {
 }
 
 /**
- * Mappings from gRPC status codes to their string equivalents.
+ * Mappings from gRPC status codes to their string equivalents. Used to convert
+ * error codes from the emulator into the codes and statuses matching errors
+ * from production.
  * @internal
  */
-export const GRPC_STATUS_CODE_TO_STRING: Record<number, string> = {
+export const EMULATOR_GRPC_STATUS_CODE_TO_STRING: Record<number, string> = {
   1: 'CANCELLED',
   2: 'UNKNOWN',
   3: 'INVALID_ARGUMENT',