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Improve frontend guideline (#23252)

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If an event listener must be `async`, the `e.preventDefault()` should be
before any `await`,
it's recommended to put it at the beginning of the function.
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docs/content/doc/developers/guidelines-frontend.en-us.md
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@ -83,6 +83,9 @@ It's not recommended to use `async` event listeners, which may lead to problems.
The reason is that the code after await is executed outside the event dispatch. The reason is that the code after await is executed outside the event dispatch.
Reference: https://github.com/github/eslint-plugin-github/blob/main/docs/rules/async-preventdefault.md Reference: https://github.com/github/eslint-plugin-github/blob/main/docs/rules/async-preventdefault.md
If an event listener must be `async`, the `e.preventDefault()` should be before any `await`,
it's recommended to put it at the beginning of the function.
If we want to call an `async` function in a non-async context, If we want to call an `async` function in a non-async context,
it's recommended to use `const _promise = asyncFoo()` to tell readers it's recommended to use `const _promise = asyncFoo()` to tell readers
that this is done by purpose, we want to call the async function and ignore the Promise. that this is done by purpose, we want to call the async function and ignore the Promise.