Function memo

memo<T>(builder: (maxDepth: number) => Arbitrary<T>): Memo<T>

For mutually recursive types

Type Parameters

T

Parameters

builder: (maxDepth: number) => Arbitrary<T>
Arbitrary builder taken the maximal depth allowed as input (parameter n)

Returns Memo<T>

Example

// tree is 1 / 3 of node, 2 / 3 of leaf
const tree: fc.Memo<Tree> = fc.memo(n => fc.oneof(node(n), leaf(), leaf()));
const node: fc.Memo<Tree> = fc.memo(n => {
  if (n <= 1) return fc.record({ left: leaf(), right: leaf() });
  return fc.record({ left: tree(), right: tree() }); // tree() is equivalent to tree(n-1)
});
const leaf = fc.nat;

Remarks

Since 1.16.0