function command( repl, cmds ) {
	return onCommand;

	/**
	* Returns aliases related to a provided alias.
	*
	* @private
	* @param {*} alias - alias
	* @returns {(StringArray|void)} related packages as a newline-delimited list
	*/
	function onCommand( alias ) {
		var aliases;
		var out;
		var N;
		var i;

		aliases = repl._aliases;
		N = aliases.length;

		if ( isString( alias ) ) {
			out = alias2related( alias );
		}
		// If unable to resolve related aliases, check if we were provided a reference to a REPL-specific command...
		if ( !out ) {
			for ( i = 0; i < cmds.length; i++ ) {
				if ( cmds[ i ][ 1 ] === alias ) {
					out = alias2related( cmds[ i ][ 0 ] );
				}
			}
		}
		// If provided an `alias` which is not a string or we failed to resolve related aliases based on the provided string value, we try to resolve a string alias (and subsequently related aliases) by searching the list of cached references of global variables/properties...
		if ( !out ) {
			i = indexOf( N/2, aliases, 2, 1, alias );
			if ( i >= 0 ) {
				out = alias2related( aliases[ i-1 ] );
			}
		}
		// If we failed to resolve related aliases and the provided value is an object, try finding a provided value's constructor (e.g., if provided a `Uint32Array`, try finding related aliases for `Uint32Array`)...
		if ( !out && typeof alias === 'object' && alias !== null && alias.constructor ) {
			i = indexOf( N/2, aliases, 2, 1, alias.constructor );
			if ( i >= 0 ) {
				out = alias2related( aliases[ i-1 ] );
			}
		}
		if ( out === void 0 || out === null ) {
			repl._ostream.write( 'Error: unrecognized alias. Alias: `'+alias2string( alias )+'`.\n' );
			return;
		}
		if ( out.length ) {
			return out;
		}
	}
}
Returns a callback to be invoked upon calling the `alias2related` command.

@private
@param {REPL} repl - REPL instance
@param {ArrayArray} cmds - REPL command list
@returns {Function} callback