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Polyfill for util.promisify in node versions < v8

node v8.0.0 added support for a built-inutil.promisify:nodejs/node#12442

This package provides the built-inutil.promisify in node v8.0.0 and later, and a replacement in other environments.

Direct

constpromisify=require('util.promisify');// Use `promisify` just like the built-in method on `util`

Shim

require('util.promisify/shim')();// `util.promisify` is now definedconstutil=require('util');// Use `util.promisify`

Note: this package requires a native ES5 environment, and forPromise to be globally available. It will throw upon requiring it if these are not present.

If you want to promisify a whole module, like thefs module, you can useutil.promisify-all.