nodejs/node · error · GypError

Anonymous action in target %s. An action must have an 'acti

Error message

Anonymous action in target %s.  An action must have an 'action_name' field.

What it means

ValidateActionsInTarget iterates target_dict['actions'] and requires each action to declare a non-empty 'action_name'. The name is how the build system identifies and de-duplicates the action, so an anonymous (missing or empty) name is rejected.

Source

Thrown at tools/gyp/pylib/gyp/input.py:2812

            "The 'working_directory' for 'run_as' in target %s "
            "in file %s should be a string." % (target_name, build_file)
        )
    environment = run_as.get("environment")
    if environment and not isinstance(environment, dict):
        raise GypError(
            "The 'environment' for 'run_as' in target %s "
            "in file %s should be a dictionary." % (target_name, build_file)
        )


def ValidateActionsInTarget(target, target_dict, build_file):
    """Validates the inputs to the actions in a target."""
    target_name = target_dict.get("target_name")
    actions = target_dict.get("actions", [])
    for action in actions:
        action_name = action.get("action_name")
        if not action_name:
            raise GypError(
                "Anonymous action in target %s.  "
                "An action must have an 'action_name' field." % target_name
            )
        inputs = action.get("inputs", None)
        if inputs is None:
            raise GypError("Action in target %s has no inputs." % target_name)
        action_command = action.get("action")
        if action_command and not action_command[0]:
            raise GypError("Empty action as command in target %s." % target_name)


def TurnIntIntoStrInDict(the_dict):
    """Given dict the_dict, recursively converts all integers into strings."""
    # Use items instead of iteritems because there's no need to try to look at
    # reinserted keys and their associated values.
    for k, v in the_dict.items():
        if isinstance(v, int):
            v = str(v)

View on GitHub (pinned to 1b2de5e052)

Solutions

Add a unique, descriptive 'action_name' string to the action dict.
Verify the field is spelled exactly 'action_name'.
Re-run gyp.

Example fix

// before
{ 'inputs': ['in.txt'], 'action': ['gen', 'out.cc'] },
// after
{ 'action_name': 'gen_out', 'inputs': ['in.txt'], 'action': ['gen', 'out.cc'] },

Defensive patterns

Strategy: validation

Validate before calling

for a in target_dict.get('actions', []):
    if not a.get('action_name'):
        raise ValueError('every action needs a non-empty action_name')

Type guard

def actions_all_named(target_dict: dict) -> bool:
    return all(a.get('action_name') for a in target_dict.get('actions', []))

Prevention

Make action_name a required field in your .gyp authoring template.
Use a descriptive, target-scoped name to aid debugging.
Lint actions in pre-commit.

When it happens

Trigger: An entry in a target's 'actions' list where action.get('action_name') is falsy (None, empty string).

Common situations: Adding an action and forgetting the action_name field; copy-pasting an action and leaving a blank name; a typo like 'name' instead of 'action_name'.

Related errors

AI-assisted analysis of nodejs/node@1b2de5e052 (2026-08-13). Data as JSON: /api/errors/df8631ef1ed18565. Report an issue: GitHub.