Question 1

pify vs util.promisify: which should I use?

Accepted Answer

Use pify for advanced needs like promisifying entire modules, handling multi-argument callbacks, or custom options, but stick with util.promisify for simple, single-function cases in Node.js since it's built-in and sufficient. Pify also boasts better performance in some benchmarks.

Question 2

how to promisify a class method with pify?

Accepted Answer

Promisify the whole class or bind the method first to maintain context. As shown in the FAQ, use `pify(someClass.someFunction.bind(someClass))` to ensure the method accesses its class instance correctly.

Question 3

Does pify work with TypeScript?

Accepted Answer

Yes, but with a key limitation: it only selects the last function overload in TypeScript, so you may need type assertions for proper typing, as explained in the FAQ section on function overloads.

Question 4

How to handle multiple callback arguments with pify?

Accepted Answer

Enable the `multiArgs: true` option when calling pify. This makes the promisified function return an array of all callback arguments, which is useful for APIs like `request` that return response and body separately.

Question 5

Can I exclude certain methods when promisifying an entire module?

Accepted Answer

Yes, use the `exclude` option with regex or string patterns. By default, methods ending in 'Sync' are excluded, but you can customize this to skip specific methods, as detailed in the README's options.

Question 6

What promise libraries can I use with pify?

Accepted Answer

Pify supports custom promise modules via the `promiseModule` option. You can integrate libraries like Bluebird by passing them to this option, allowing flexibility beyond native promises.

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