Function union

Example

type Point = Readonly<{ x: number; tag: string }>;

const toKey = (point: Point) => JSON.stringify(point);

// eslint-disable-next-line total-functions/no-unsafe-type-assertion
const fromKey = (key: string) => JSON.parse(key) as Point;

const left = ISetMapped.create<Point, string>(
  [{ x: 1, tag: 'a' }],
  toKey,
  fromKey,
);
const right = ISetMapped.create<Point, string>(
  [{ x: 2, tag: 'b' }],
  toKey,
  fromKey,
);

const combined = ISetMapped.union(left, right);

assert.deepStrictEqual(Array.from(combined), [
  { x: 1, tag: 'a' },
  { x: 2, tag: 'b' },
]);
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