filterConstructors.ts

export const equals = <A, K extends keyof A>(field: K, val: A[K]): Filter<A> => ({
  kind: "Equals",
  field,
  val
});
export const greater = <A, K extends keyof A>(field: K, val: A[K]): Filter<A> => ({
  kind: "Greater",
  field,
  val
});
export const less = <A, K extends keyof A>(field: K, val: A[K]): Filter<A> => ({
  kind: "Less",
  field,
  val
});
export const and = <A>(a: Filter<A>, b: Filter<A>): Filter<A> => ({
  kind: "And",
  a,
  b
});
export const or = <A>(a: Filter<A>, b: Filter<A>): Filter<A> => ({
  kind: "Or",
  a,
  b
});