{"record":{"id":"7d46f19dca9aca54","repo":"reflex-dev/reflex","slug":"the-var-is-local-argument-is-not-supported-for-va","errorCode":null,"errorMessage":"The _var_is_local argument is not supported for Var.","messagePattern":"The _var_is_local argument is not supported for Var\\.","errorType":"exception","errorClass":"TypeError","httpStatus":null,"severity":"error","filePath":"packages/reflex-base/src/reflex_base/vars/base.py","lineNumber":787,"sourceCode":"        merge_var_data: VarData | None = None,\n        **kwargs: Any,\n    ) -> Self | Var:\n        \"\"\"Make a copy of this Var with updated fields.\n\n        Args:\n            _var_type: The new type of the Var.\n            merge_var_data: VarData to merge into the existing VarData.\n            **kwargs: Var fields to update.\n\n        Returns:\n            A new Var with the updated fields overwriting the corresponding fields in this Var.\n\n        Raises:\n            TypeError: If _var_is_local, _var_is_string, or _var_full_name_needs_state_prefix is not None.\n        \"\"\"\n        if kwargs.get(\"_var_is_local\", False) is not False:\n            msg = \"The _var_is_local argument is not supported for Var.\"\n            raise TypeError(msg)\n\n        if kwargs.get(\"_var_is_string\", False) is not False:\n            msg = \"The _var_is_string argument is not supported for Var.\"\n            raise TypeError(msg)\n\n        if kwargs.get(\"_var_full_name_needs_state_prefix\", False) is not False:\n            msg = \"The _var_full_name_needs_state_prefix argument is not supported for Var.\"\n            raise TypeError(msg)\n        value_with_replaced = dataclasses.replace(\n            self,\n            _var_type=_var_type or self._var_type,\n            _var_data=VarData.merge(\n                kwargs.get(\"_var_data\", self._var_data), merge_var_data\n            ),\n            **kwargs,\n        )\n\n        if (js_expr := kwargs.get(\"_js_expr\")) is not None:","sourceCodeStart":769,"sourceCodeEnd":805,"githubUrl":"https://github.com/reflex-dev/reflex/blob/45b8ed5ab735f8a56bbb09a42384f030eb0208e7/packages/reflex-base/src/reflex_base/vars/base.py#L769-L805","documentation":"Var._replace rejects the legacy keyword _var_is_local. Modern Var tracks locality inside VarData, so the old boolean flag is no longer accepted; passing it raises TypeError. The same guard covers _var_is_string and _var_full_name_needs_state_prefix.","triggerScenarios":"Calling var._replace(_var_is_local=True) or dataclasses.replace-style updates with that kwarg; code written against an older reflex API where these flags existed on Var; copy-pasted internal framework code after an upgrade.","commonSituations":"Upgrading reflex to a version where Var internals were refactored to VarData; long-lived projects or component libraries using _replace with legacy kwargs; tutorials predating the refactor.","solutions":["Remove the _var_is_local kwarg and set locality via VarData (e.g. pass a VarData with the appropriate hooks) or use the replacement public API","Update the calling code to the current _replace signature (only _var_type/_var_data and friends)","Upgrade any third-party reflex packages pinned to old versions so they stop passing the flag","Search the codebase for _var_is_local and migrate every occurrence"],"exampleFix":"# before\nv = v._replace(_var_is_local=True)\n# after\nfrom reflex.vars import VarData\nv = v._replace(_var_data=VarData(...))  # locality now lives in VarData","handlingStrategy":"type-guard","validationCode":"kwargs.pop('_var_is_local', None)  # legacy kwarg, no longer supported\nv = v._replace(**kwargs)","typeGuard":"def is_supported_replace_kwarg(name: str) -> bool:\n    return name not in {'_var_is_local', '_var_is_string', '_var_full_name_needs_state_prefix'}","tryCatchPattern":null,"preventionTips":["Avoid private Var APIs; rely on Var.create/VarData","After reflex upgrades, grep the codebase for removed flags like _var_is_local"],"tags":["reflex","var","deprecated-argument","upgrade"],"backgroundTag":"removed-api-argument","analyzedSha":"45b8ed5ab735f8a56bbb09a42384f030eb0208e7","analyzedAt":"2026-08-28T19:25:27.644Z","schemaVersion":2},"datasetVersion":"2026-08-28T21:17:43.275Z"}