Home > Web Front-end > JS Tutorial > Why Does 'await is only valid in async function' Occur?

Why Does 'await is only valid in async function' Occur?

Susan Sarandon
Release: 2024-12-14 05:37:10
Original
931 people have browsed it

Why Does

Async Functions and the "await" Keyword: What's Causing the "await is only valid in async function" Error?

Often encountered in coding, the "await is only valid in async function" error arises when attempting to utilize the "await" keyword outside of an "async" function, as its namesake implies. To understand this issue, let's delve into the code you provided.

In your helper.js file, you have defined an "async" function named "myfunction," which correctly uses the "async" keyword and returns an array of variables. However, the error doesn't stem from this function. It lies within the "start" function in another file.

The "start" function is not declared as "async," making it ineligible to utilize the "await" keyword. To rectify this, you need to convert "start" into an "async" function, as demonstrated in the modified code below:

const start = async function(a, b) {
  const result = await helper.myfunction('test', 'test');
}
Copy after login

By making "start" an "async" function, you enable it to pause execution and await the completion of the "myfunction" promise before continuing.

Remember that the "await" keyword can only be used within "async" functions, so always declare your functions with the "async" keyword when you intend to use "await" within them. This ensures proper asynchronous code execution, avoiding the "await is only valid in async function" error.

The above is the detailed content of Why Does 'await is only valid in async function' Occur?. For more information, please follow other related articles on the PHP Chinese website!

source:php.cn
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Latest Articles by Author
Popular Tutorials
More>
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template