Support firebase dataconnect:sdk:generate --watch (#7719)

* Support firebase dataconnect:sdk:generaate --watch

* Properly set --watch option.

---------

Co-authored-by: joehan <joehanley@google.com>

src/commands/dataconnect-sdk-generate.ts

@@ -8,9 +8,15 @@ import { load } from "../dataconnect/load";
 import { readFirebaseJson } from "../dataconnect/fileUtils";
 import { logger } from "../logger";
 
+type GenerateOptions = Options & { watch?: boolean };
+
 export const command = new Command("dataconnect:sdk:generate")
   .description("generates typed SDKs for your Data Connect connectors")
-  .action(async (options: Options) => {
+  .option(
+    "--watch",
+    "watch for changes to your connector GQL files and regenerate your SDKs when updates occur",
+  )
+  .action(async (options: GenerateOptions) => {
     const projectId = needProjectId(options);
 
     const services = readFirebaseJson(options.config);
@@ -39,6 +45,7 @@ export const command = new Command("dataconnect:sdk:generate")
         const output = await DataConnectEmulator.generate({
           configDir,
           connectorId: conn.connectorYaml.connectorId,
+          watch: options.watch,
         });
         logger.info(output);
         logger.info(`Generated SDKs for ${conn.connectorYaml.connectorId}`);

src/emulator/dataconnectEmulator.ts

@@ -35,6 +35,7 @@ export interface DataConnectEmulatorArgs {
 export interface DataConnectGenerateArgs {
   configDir: string;
   connectorId: string;
+  watch?: boolean;
 }
 
 export interface DataConnectBuildArgs {
@@ -184,6 +185,9 @@ export class DataConnectEmulator implements EmulatorInstance {
       `--config_dir=${args.configDir}`,
       `--connector_id=${args.connectorId}`,
     ];
+    if (args.watch) {
+      cmd.push("--watch");
+    }
     const res = childProcess.spawnSync(commandInfo.binary, cmd, { encoding: "utf-8" });
 
     logger.info(res.stderr);