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Is this a native async function?

Example

``js
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`

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