@prelude/function/mjs/index.test.js

Function module.

import * as Function from './index.js';
test('Function.t works with instanceof', () => {
    const f = () => 1;
    expect(f instanceof Function.t).toBe(true);
});
test('Function.t is a function', () => {
    expect(typeof Function.t).toBe('function');
});
test('Function.t can be used as type in Map', () => {
    const map = new Map();
    map.set('f', (_) => _ + 1);
    expect(map.get('f')?.(1)).toEqual(2);
});
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