15 lines
2.0 KiB
JavaScript
15 lines
2.0 KiB
JavaScript
// wrapper an async function that support callback style API.
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// It will preserve 'this'.
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export function callbackify(fn) {
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return function () {
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const args = [...arguments];
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const callback = args.pop();
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// If the last argument is a function, assume it's the callback.
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if (typeof callback === 'function') {
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return fn.apply(this, args).then(result => callback(null, result), err => callback(err));
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}
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return fn.apply(this, arguments);
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};
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}
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