/** Split a string on the first occurrence of a given separator. @param string - The string to split. @param separator - The separator to split on. @example ``` import splitOnFirst = require('split-on-first'); splitOnFirst('a-b-c', '-'); //=> ['a', 'b-c'] splitOnFirst('key:value:value2', ':'); //=> ['key', 'value:value2'] splitOnFirst('a---b---c', '---'); //=> ['a', 'b---c'] splitOnFirst('a-b-c', '+'); //=> ['a-b-c'] ``` */ declare function splitOnFirst( string: string, separator: string ): [string, string?]; export = splitOnFirst;