30 lines
3.1 KiB
JavaScript
30 lines
3.1 KiB
JavaScript
// Returns a wrapper function that will promisify a given callback function.
|
|
// It will preserve 'this'.
|
|
export function promisify(fn) {
|
|
return function () {
|
|
// If the last argument is a function, assume its the callback.
|
|
let callback = arguments[arguments.length - 1];
|
|
|
|
// If the callback is given, don't promisify, just pass straight in.
|
|
if (typeof callback === 'function') {
|
|
return fn.apply(this, arguments);
|
|
}
|
|
|
|
// Otherwise, create a new set of arguments, and wrap
|
|
// it in a promise.
|
|
let args = [...arguments];
|
|
return new Promise((resolve, reject) => {
|
|
// Add the callback function.
|
|
args.push((err, value) => {
|
|
if (err) {
|
|
return reject(err);
|
|
}
|
|
resolve(value);
|
|
});
|
|
|
|
// Call the function with our special adaptor callback added.
|
|
fn.apply(this, args);
|
|
});
|
|
};
|
|
}
|
|
//# sourceMappingURL=data:application/json;charset=utf-8;base64,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
|