Conditions

A headless condition expression engine for filters and rule builders.

Define fields once, then validate, evaluate, and serialize the same AND/OR expression tree on the server and in the UI. The package has no React or DOM code — it owns the condition model, not the controls.

const contacts = defineConditions({
  fields: {
    status: {
      type: 'enum',
      schema: z.enum(['active', 'pending']),
      operators: ['equals', 'not', 'in'],
    },
    age: {
      type: 'number',
      schema: z.number().int().min(0),
      operators: ['gte', 'lte', 'between'],
    },
  },
})

const matches = contacts.evaluate(query, {
  status: 'active',
  age: 21,
})

Version

0.0.1