require( id )
    Imports a module, JSON, or local file.

    Modules can be imported from `node_modules`.

    Local modules and JSON files can be imported using a relative path (e.g.,
    './foo.js', './../bar.json', etc) that will be resolved against the current
    working directory.

    Parameters
    ----------
    id: string
        Module name or path.

    Returns
    -------
    m: any
        Module export.

    Examples
    --------
    > var crypto = require( 'crypto' )

    See Also
    --------
    rerequire