A TypeScript library for managing application state with powerful condition evaluation and reactive subscriptions.
- Multiple Value Types - Boolean flags, numeric counters, and string values
- Powerful Conditions - Complex expressions with AND, OR, NOT, comparisons
- Reactive Subscriptions - Watch all changes or specific keys
- Persistent Storage - Save/load to localStorage or custom backends
- Undo/Redo History - Built-in time-travel debugging support
- Computed Values - Derived flags that auto-update on dependency changes
- Namespacing - Organize flags into logical scoped groups
- Batch Operations - Atomic updates with automatic rollback
import { createFlagStore } from '@motioneffector/flags'
const store = createFlagStore({
initial: { gold: 0, has_key: false, reputation: 50 }
})
// Simple operations
store.set('has_key', true)
store.increment('gold', 25)
// Powerful condition evaluation
if (store.check('gold >= 20 AND !has_key')) {
store.decrement('gold', 20)
store.set('has_key', true)
}
// Subscribe to changes
store.subscribe((key, newValue, oldValue) => {
console.log(`${key}: ${oldValue} → ${newValue}`)
})- Comprehensive test suite - 569 unit tests covering core functionality
- Fuzz tested - Randomized input testing to catch edge cases
- Strict TypeScript - Full type coverage with no
anytypes - Zero dependencies - No supply chain risk
MIT © motioneffector