/**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']```*/declarefunctionsplitOnFirst(string:string,separator:string):[string,string?];export=splitOnFirst;