[CLI] Validate node version (#2489)

libs/cli/langgraph_cli/cli.py

@@ -1,4 +1,3 @@
-import json
 import pathlib
 import shutil
 import sys
@@ -354,8 +353,7 @@ def build(
     with Runner() as runner, Progress(message="Pulling...") as set:
         if shutil.which("docker") is None:
             raise click.UsageError("Docker not installed") from None
-        with open(config) as f:
-            config_json = langgraph_cli.config.validate_config(json.load(f))
+        config_json = langgraph_cli.config.validate_config_file(config)
         _build(
             runner, set, config, config_json, base_image, pull, tag, docker_build_args
         )
@@ -435,8 +433,7 @@ tests
 def dockerfile(save_path: str, config: pathlib.Path, add_docker_compose: bool) -> None:
     save_path = pathlib.Path(save_path).absolute()
     secho(f"🔍 Validating configuration at path: {config}", fg="yellow")
-    with open(config, encoding="utf-8") as f:
-        config_json = langgraph_cli.config.validate_config(json.load(f))
+    config_json = langgraph_cli.config.validate_config_file(config)
     secho("✅ Configuration validated!", fg="green")
 
     secho(f"📝 Generating Dockerfile at {save_path}", fg="yellow")
@@ -575,7 +572,7 @@ def dev(
     host: str,
     port: int,
     no_reload: bool,
-    config: str,
+    config: pathlib.Path,
     n_jobs_per_worker: Optional[int],
     no_browser: bool,
     debug_port: Optional[int],
@@ -601,12 +598,9 @@ def dev(
             "Please ensure langgraph-cli is installed with the 'inmem' extra: pip install -U \"langgraph-cli[inmem]\""
         ) from None
 
-    import json
+    config_json = langgraph_cli.config.validate_config_file(config)
 
-    with open(config, encoding="utf-8") as f:
-        config_data = json.load(f)
-
-    graphs = config_data.get("graphs", {})
+    graphs = config_json.get("graphs", {})
     run_server(
         host,
         port,
@@ -674,8 +668,7 @@ def prepare(
     debugger_base_url: Optional[str] = None,
     postgres_uri: Optional[str] = None,
 ):
-    with open(config_path) as f:
-        config = langgraph_cli.config.validate_config(json.load(f))
+    config_json = langgraph_cli.config.validate_config_file(config_path)
     # pull latest images
     if pull:
         runner.run(
@@ -683,9 +676,9 @@ def prepare(
                 "docker",
                 "pull",
                 (
-                    f"langchain/langgraphjs-api:{config['node_version']}"
-                    if config.get("node_version")
-                    else f"langchain/langgraph-api:{config['python_version']}"
+                    f"langchain/langgraphjs-api:{config_json['node_version']}"
+                    if config_json.get("node_version")
+                    else f"langchain/langgraph-api:{config_json['python_version']}"
                 ),
                 verbose=verbose,
             )
@@ -694,7 +687,7 @@ def prepare(
     args, stdin = prepare_args_and_stdin(
         capabilities=capabilities,
         config_path=config_path,
-        config=config,
+        config=config_json,
         docker_compose=docker_compose,
         port=port,
         watch=watch,