Add the following to ~/Library/Application Support/Sublime Text 3/Packages/User/Default (OSX).sublime-keymap
.
[
{ "keys": ["alt+down"], "command": "swap_line_down" },
{ "keys": ["alt+z"], "command": "toggle_setting", "args": { "setting": "word_wrap" } },
{ "keys": ["alt+up"], "command": "swap_line_up" },
{ "keys": ["shift+alt+down"], "command": "duplicate_line" },
{ "keys": ["shift+alt+f"], "command": "js_prettier" },
{ "keys": ["shift+alt+i"], "command": "split_selection_into_lines" },
{ "keys": ["shift+alt+up"], "command": "duplicate_line" },
{ "keys": ["super+k", "super+w"], "command": "close_all" },
{ "keys": ["super+shift+l"], "command": "find_all_under" },
{ "keys": ["super+b"], "command": "toggle_side_bar" }
]