Gtk.TextIter.prototype.get_slice

function get_slice(end:Gtk.TextIter):String {
    // Gjs wrapper for gtk_text_iter_get_slice()
}

Returns the text in the given range. A "slice" is an array of characters encoded in UTF-8 format, including the Unicode "unknown" character 0xFFFC for iterable non-character elements in the buffer, such as images. Because images are encoded in the slice, byte and character offsets in the returned array will correspond to byte offsets in the text buffer. Note that 0xFFFC can occur in normal text as well, so it is not a reliable indicator that a pixbuf or widget is in the buffer.