Moving windows programmatically in Gnome under Wayland (or X)

widescreen-resize.sh

#!/bin/bash
# -------- THIS SCRIPT IS OUTDATED -------
# Gnome has removed the Shell.Eval endpoint, so it won't work anymore.
# Feel free to use it as inspiration for something else.
# Original comment below.
# ----------------------------------------
# This script programmatically moves around the windows on my screens.
# The JavaScript can be prototyped in Looking Glass (ALT+F2 lg). The documentation of MetaWindow can be found here:
# https://developer.gnome.org/meta/stable/MetaWindow.html
set -e
if [ -z "$1" ]; then
    echo "Please give a configuration (1-5)."
    exit 1;
fi

case $1 in
    1)
        # Main screen left
        X=0
        Y=0
        W=1146
        H=1410
        M=2     # Maximization mode, 1 -> horizontal, 2 -> vertical, 3 -> both
        ;;
    2)
        # Main screen middle
        X=1146
        Y=0
        W=1148  # Middle one is a few pixels wider
        H=1410
        M=2
        ;;
    3)
        # Main screen right
        X=2294
        Y=0
        W=1146
        H=1410
        M=2
        ;;
    4)  # Secondary screen (fullscreen)
        X=3440
        Y=0
        W=1080
        H=1920
        M=3
        ;;
    5)
        # Main screen middle - wider (60%)
        X=688
        Y=0
        W=2064
        H=1410
        M=2
        ;;
    *)
        echo "Invalid configuration $1."
        exit 1
esac

JS="""
const GLib = imports.gi.GLib;
global.get_window_actors().forEach(function (w) {
    var mw = w.meta_window;
    if (mw.has_focus()) {
        if (mw.get_maximized()) {
            mw.unmaximize(3); // 3 is META_MAXIMIZE_BOTH, so unmaximizing the window in both directions
        }

        mw.move_resize_frame(0, $X, $Y, $W, $H);

        if ($M) {
            // Maximization needs to be delayed a little, so that the window has time to move
            GLib.timeout_add(GLib.PRIORITY_DEFAULT, 500, function() { mw.maximize($M); });
        }
    }
});
"""

gdbus call --session --dest org.gnome.Shell --object-path /org/gnome/Shell --method org.gnome.Shell.Eval "$JS"

https://developer.gnome.org/meta/stable/MetaWindow.html

This leads to a 404.
Try https://gjs-docs.gnome.org/meta9~9_api/ (or https://gjs-docs.gnome.org/ and searching for Meta, when that one breaks as well).
I also found https://gjs-docs.gnome.org/shell01~0.1_api/ helpful.

Actually, this gist is outdated. Newer versions of Gnome have removed the Shell.Eval method so this exact method won't work anymore. One would have to write a full Gnome Extension, I think.

Alternatives:
https://extensions.gnome.org/extension/4724/window-calls/
https://github.com/khimaros/smart-auto-move