This function validates that the input is an object and uses the provided key sub-rule to validate each key and the value sub-rule to validate each value. This function can throw the rulr.InvalidObjectError for invalid objects. All errors thrown by the key sub-rule will be wrapped in the rulr.DictionaryKeyValidationError. All errors thrown by the value sub-rule will be wrapped in the rulr.KeyedValidationError. All errors thrown by sub rules will be wrapped in rulr.ValidationErrors. For valid data, this function returns a dictionary and uses TypeScript's Record type.
import * as rulr from 'rulr'
const constrainToExample = rulr.dictionary(rulr.string, rulr.number)
type Example = rulr.Static<typeof constrainToExample>
// Record<string, number>
// Valid
const example1: Example = constrainToExample({ example: 1 })
// Invalid
const example2: Example = constrainToExample([])
// Invalid
const example3: Example = constrainToExample({ example: '1' })
// Invalid
const example4: Example = constrainToExample({ 0: 1 })