2c8b646bb5
* fix: enforce mutually exclusive component constraint on paste
Pasting a component (e.g. Chat Input) no longer bypasses the
mutual-exclusivity rule when a conflicting component (e.g. Webhook)
already exists in the flow. The paste flow previously only checked the
singleton constraint, so a copy/paste could place both Chat Input and
Webhook in the same flow and break flow logic.
- Add MUTUALLY_EXCLUSIVE_COMPONENTS as the shared source of truth in
constants; the sidebar exclusivity rules now alias it
- Add filterMutuallyExclusiveComponents helper, wired into flowStore
paste; fast-paths non-constrained pastes and guards against
prototype-key clipboard input
- Internationalize the paste notice across all 7 locales
- Add unit tests covering existing-flow conflicts, intra-selection
conflicts, edge cleanup, and adversarial input
* refactor: unify component placement policy into one constraint module
Address review: placement policy was duplicated across five locations
(sidebar booleans, EXCLUSIVITY_RULES, checkChatInput/checkWebhookInput,
singleton paste filter, mutual-exclusivity paste filter), which is how
the paste-validation gap drifted in.
- Add utils/componentConstraints.ts as the single source of truth:
COMPONENT_CONSTRAINTS plus a pure rule engine (evaluatePlacement,
filterPlaceableSelection, getPresentComponentTypes)
- Sidebar disable/tooltip and flowStore paste both consume the engine;
remove the four duplicated policy encodings
- Make the paste filter side-effect free (returns { nodes, edges,
violations }); flowStore surfaces the notice and collapses singleton
and mutual-exclusivity into one pass
- Move policy out of the global constants dump into the focused module
- Internationalize both paste notices across all 7 locales
- Update tests for the new shapes; add componentConstraints unit tests
* test: type sidebarItemsList mocks to satisfy noExplicitAny
Langflow is a powerful platform for building and deploying AI-powered agents and workflows. It provides developers with both a visual authoring experience and built-in API and MCP servers that turn every workflow into a tool that can be integrated into applications built on any framework or stack. Langflow comes with batteries included and supports all major LLMs, vector databases and a growing library of AI tools.
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