flow like the river

BACK_BACK/node_modules/util.promisify/README.md

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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).