is-async-function [![Version Badge][2]][1]

December 29, 2025 ยท View on GitHub

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Is this a native async function?

Example

var isAsyncFunction = require('is-async-function');
assert(!isAsyncFunction(function () {}));
assert(!isAsyncFunction(null));
assert(!isAsyncFunction(function* () { yield 42; return Infinity; }));
assert(isAsyncFunction(async function () {}));

Tests

Simply clone the repo, npm install, and run npm test