no-await-in-sync-fn

NOTE: this rule is part of the recommended rule set.

Enable full set in deno.json:

{
  "lint": {
    "rules": {
      "tags": ["recommended"]
    }
  }
}

Enable full set using the Deno CLI:

deno lint --rules-tags=recommended

This rule can be explictly included to or excluded from the rules present in the current tag by adding it to the include or exclude array in deno.json:

{
  "lint": {
    "rules": {
      "include": ["no-await-in-sync-fn"],
      "exclude": ["no-await-in-sync-fn"]
    }
  }
}

Disallow await keyword inside a non-async function.

Using the await keyword inside a non-async function is a syntax error. To be able to use await inside a function, the function needs to be marked as async via the async keyword.

Invalid:

function foo() {
  await bar();
}

const fooFn = function foo() {
  await bar();
};

const fooFn = () => {
  await bar();
};

Valid:

async function foo() {
  await bar();
}

const fooFn = async function foo() {
  await bar();
};

const fooFn = async () => {
  await bar();
};

no-await-in-sync-fn

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