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# util.promisify Polyfill for util.promisify in node versions < v8 node v8.0.0 added support for a built-in `util.promisify`: https://github.com/nodejs/node/pull/12442/ This package provides the built-in `util.promisify` in node v8.0.0 and later, and a replacement in other environments. ## Usage **Direct** ```js const promisify = require('util.promisify'); // Use `promisify` just like the built-in method on `util` ``` **Shim** ```js require('util.promisify/shim')(); // `util.promisify` is now defined const util = require('util'); // Use `util.promisify` ``` Note: this package requires a native ES5 environment, and for `Promise` to be globally available. It will throw upon requiring it if these are not present. ## Promisifying modules If you want to promisify a whole module, like the `fs` module, you can use [`util.promisify-all`](https://www.npmjs.com/package/util.promisify-all).