/**
Convert a camelized string into a lowercased one with a custom separator: `unicornRainbow` → `unicorn_rainbow`.
@param string - The camelcase string to decamelize.
@param separator - The separator to use to put in between the words from `string`. Default: `'_'`.
@example
```
import decamelize = require('decamelize');
decamelize('unicornRainbow');
//=> 'unicorn_rainbow'
decamelize('unicornRainbow', '-');
//=> 'unicorn-rainbow'
```
*/
declare function decamelize(string: string, separator?: string): string;
export = decamelize;