interface joinOptions {
    /**
     * Delimiter to join with
     * (default=' ')
     * eg: join(['hello', 'world', {delim: '_'}]) -> 'hello_world'
     */
    delim?: string;
    /**
     * Dedupe the provided array while joining or not?
     * (default=false)
     * eg: join(['val_a', 'val_b', 'val_'a], {dedupe: true, delim:','}) -> 'val_a,val_b'
     */
    dedupe?: boolean;
    /**
     * Trim after joining or not
     * (default=true)
     * eg: join(['  hello', 'world  '], {trim: true}) -> 'hello world'
     */
    trim?: boolean;
    /**
     * Trim internals of values or not
     * (default=false)
     * eg: join(['   hello    world', 'this   is ', 'Peter'], {innertrim: true, trim: true}) -> 'hello world this is peter'
     */
    innertrim?: boolean;
    /**
     * Automatically trim all string values
     * (default=true)
     * eg: join([' hello   ', ' world '], {valtrim: true}) -> 'hello world'
     */
    valtrim?: boolean;
    /**
     * Automatically round all numeric values
     * (default=false)
     * eg: join([5.432, 'world', 1.2], {valround: 1}) -> '5.4 world 1.2'
     */
    valround?: number;
}
/**
 * Join an array of values while autofiltering any non-string/non-number elements
 *
 * @param {T[]|Set<T>} val - Array or Set of values to join
 * @param {joinOptions?} opts - Join options
 */
declare function join<T>(val: T[] | Set<T>, opts?: joinOptions): string;
export { join, join as default };