lazy-methods-throw-eagerly-on-next-non-callable.js

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// |reftest| skip-if(!this.hasOwnProperty('AsyncIterator'))

//

//

/*---

esid: pending

description: Lazy %AsyncIterator.prototype% methods throw eagerly when `next` is non-callable.

info: >

  Iterator Helpers proposal 1.1.1

features: [iterator-helpers]

---*/

async function* gen(x) { yield x; }

const methods = [

  next => AsyncIterator.prototype.map.bind({next}, x => x),

  next => AsyncIterator.prototype.filter.bind({next}, x => x),

  next => AsyncIterator.prototype.take.bind({next}, 1),

  next => AsyncIterator.prototype.drop.bind({next}, 0),

  next => AsyncIterator.prototype.asIndexedPairs.bind({next}),

  next => AsyncIterator.prototype.flatMap.bind({next}, gen),

];

for (const method of methods) {

  assertThrowsInstanceOf(method(0), TypeError);

  assertThrowsInstanceOf(method(false), TypeError);

  assertThrowsInstanceOf(method(undefined), TypeError);

  assertThrowsInstanceOf(method(null), TypeError);

  assertThrowsInstanceOf(method(''), TypeError);

  assertThrowsInstanceOf(method(Symbol('')), TypeError);

  assertThrowsInstanceOf(method({}), TypeError);

  assertThrowsInstanceOf(method([]), TypeError);

if (typeof reportCompare == 'function')

  reportCompare(0, 0);