Sublime 3/4 D AutoImport plugin. Add "import ...." for symbol. It provides the dlang_auto_import command.

In code like this:

class Uno : IStylable
{
    //
}

will be auto added "import ui.istylable : IStylable;" at begin of file. Like this:

import ui.istylable : IStylable;

class Uno : IStylable
{
    //
}

• Scan project files, using ST3 index
• Grep for Symbol
• Grep file for "module ..."
• Get module.name
• Check for existing "module ... : Symbol"
• Build line "import module_name : Symbol;"
• Insert in text.
• • after last "import ..."
• • after "module ..."
• • at top

Install DlangAutoImport from Package Control.

Then add a keybinding of your choice for the dlang_auto_import command, by adding a line like this to your keybindings file:

{ "keys": ["alt+a"], "command": "dlang_auto_import" },

You can also try it out immediately by choosing "D: import ..." from the context menu or command pallete.

For auto-comlition Phobos/core/sys/std D keywords (Linux):

1. Menu: Project / Edit Project

2. edit

{
    "folders":
    [
        {
            "path": "."
        },
        {
            "path": "/usr/include/dmd/druntime",
            "file_include_patterns": ["*.d"]
        },
        {
            "path": "/usr/include/dmd/phobos",
            "file_include_patterns": ["*.d"]
        }
    ]
}