Rule proposal: `prefer-await`

The rule name may be named unicorn/prefer-await.

This only applies for ES6 code that have the await keyword available.

Prefer await over Promise#then(), Promise#catch() and Promise#finally()

Prefer using await operator over Promise#then(), Promise#catch() and Promise#finally(), which is easier to write and to read afterwards.

This rule is fixable.

Fail

await doSomething().then(() => {
  // …
});

doSomething().then(() => {
  // …
});

await doSomething().catch((err) => {
  // …
});

doSomething().catch((err) => {
  // …
});

Pass

 await doSomething();

try {
  await doSomething();
} catch (err) {
  // …
}

[fisker]

How about no-promise-catch.

Second thought, if we forbid .catch, why not .then? So maybe prefer-await?

[fisker]

Reopening this, since eslint-plugin-promise don’t have autofix. I’m going to give another shot on it.