no-sync-fn-in-async-fn
Last updated: Jan 16, 2025
Disallow sync function inside async function.
Using sync functions like Deno.readTextFileSync blocks the deno event loop so
it's not recommended to use it inside of an async function, because it stops
progress of all other async tasks.
Invalid:
async function foo() {
Deno.readTextFileSync("");
}
const fooFn = async function foo() {
Deno.readTextFileSync("");
};
const fooFn = async () => {
Deno.readTextFileSync("");
};
Valid:
async function foo() {
await Deno.readTextFile("");
}
function foo() {
Deno.readTextFileSync("");
}
const fooFn = function foo() {
Deno.readTextFileSync("");
};
const fooFn = () => {
Deno.readTextFileSync("");
};