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CRDT Guidelines

crdt

Loro CRDT state management with loro-mirror. Use when working on files in src/lib/crdt/.

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SKILL.md

Full skill instructions

CRDT Guidelines

Critical: Draft-Style Mutations Only

// CORRECT - mutate in place
setState((state) => {
  state.transactions[id] = transaction;
});

// WRONG - returning new objects breaks change tracking
setState((state) => ({
  ...state,
  transactions: { ...state.transactions, [id]: transaction },
}));

Rules

  • Import types from schema.ts, don't redeclare
  • Soft deletes: Set deletedAt timestamp, never remove from document
  • Use crypto.randomUUID() for IDs, Date.now() for timestamps

Schema Pattern

export const entitySchema = schema.LoroMap({
  id: schema.String({ required: true }),
  // ... fields
  deletedAt: schema.Number(), // 0 = not deleted, >0 = timestamp
});

React Hooks

  • useActiveTransactions() - excludes soft-deleted
  • useTransactions() - includes soft-deleted
  • useVaultAction() - for mutations

Sync

  • Updates encrypted before leaving client
  • Loro handles versioning via version vectors
  • Conflicts: last-write-wins per field

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