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Output: async function returning a promise vs returning a plain value, raced against a then chain

HardP3Output

What does this code print? One of the async functions returns a promise instead of a plain value.

1async function plain() {
2  return 'plain';
3}
4async function viaPromise() {
5  return Promise.resolve('promise');
6}
7 
8plain().then(console.log);
9viaPromise().then(console.log);
10 
11Promise.resolve()
12  .then(() => console.log('t1'))
13  .then(() => console.log('t2'))
14  .then(() => console.log('t3'))
15  .then(() => console.log('t4'));

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One line per console.log. Arrays as [1, 2, 3], objects as { a: 1 }, an uncaught error as Uncaught TypeError: message (Chrome and Node wording).

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