Add mouse click `goto definition` in sublime text 3.

goto-sublime

Linux - create "Default (Linux).sublime-mousemap" in ~/.config/sublime-text-3/Packages/User
Mac - create "Default (OSX).sublime-mousemap" in ~/Library/Application Support/Sublime Text 3/Packages/User
Win - create "Default (Windows).sublime-mousemap" in %appdata%\Sublime Text 3\Packages\User

[
    {
        "button": "button1", 
        "count": 1, 
        "modifiers": ["ctrl"],
        "press_command": "drag_select",
        "command": "goto_definition"
    }
]

If you want VS Code style, like ctrl + button1 for definition and alt + button1 for selecting multiple lines, then paste this content instead:

[
    {
        "button": "button1", 
        "count": 1, 
        "modifiers": ["ctrl"],
        "press_command": "drag_select",
        "command": "goto_definition"
    },
    {
        "button": "button1", 
        "count": 1, 
        "modifiers": ["alt"],
        "press_command": "drag_select",
        "press_args": {"additive": true}
    }
]

macOS Default (OSX).sublime-mousemap in "~/Library/Application Support/Sublime Text 3/Packages/User/":

[
    // ⌘+LeftClick => goto definition
    {
        "button": "button1",
        "count": 1,
        "modifiers": ["super"],
        "press_command": "drag_select",
        "command": "goto_definition"
    },
    // ⌘+RightClick => jump back
    {
        "button": "button2",
        "modifiers": ["super"],
        "command": "jump_back"
    },
    // ⌥+LeftClick => set multiple cursors
    {
        "button": "button1",
        "count": 1,
        "modifiers": ["alt"],
        "press_command": "drag_select",
        "press_args": {"additive": true}
    }
]