[CI Skip] 0.6.4

docs/README.md

@@ -14,6 +14,24 @@ Utility methods for this package are split into groups
 
 # Available methods
 
+## assert
+
+Checks for a valid test, if not ExtError is thrown. 
+
+```js
+assert (test: boolean, message: string, code: number = ExtError.CODES.ASSERT, data: any): void
+```
+
+
+Checks that `test` is a true value. If value is `false` (or `false-ish`), it throws an ExtError with the supplied `message` and an optional `code` and `data`. When `test` passes, `true` is returned.
+
+```js
+const assert = require('@polkadot/util/assert');
+
+assert(true === true, 'True should be true'); // true returned
+assert(false === true, 'False should not be true'); // ExtError thrown
+```
+
 ## Logger
 
 Creates a consistent log interface for messages