depot/third_party/nixpkgs/doc/packages/ibus.section.md

ibus-engines.typing-booster

This package is an ibus-based completion method to speed up typing.

Activating the engine

IBus needs to be configured accordingly to activate typing-booster. The configuration depends on the desktop manager in use. For detailed instructions, please refer to the upstream docs.

On NixOS, you need to explicitly enable ibus with given engines before customizing your desktop to use typing-booster. This can be achieved using the ibus module:

{ pkgs, ... }: {
  i18n.inputMethod = {
    enable = true;
    type = "ibus";
    ibus.engines = with pkgs.ibus-engines; [ typing-booster ];
  };
}

Using custom hunspell dictionaries

The IBus engine is based on hunspell to support completion in many languages. By default, the dictionaries de-de, en-us, fr-moderne es-es, it-it, sv-se and sv-fi are in use. To add another dictionary, the package can be overridden like this:

ibus-engines.typing-booster.override { langs = [ "de-at" "en-gb" ]; }

Note: each language passed to langs must be an attribute name in pkgs.hunspellDicts.

Built-in emoji picker

The ibus-engines.typing-booster package contains a program named emoji-picker. To display all emojis correctly, a special font such as noto-fonts-color-emoji is needed:

On NixOS, it can be installed using the following expression:

{ pkgs, ... }: {
  fonts.packages = with pkgs; [ noto-fonts-color-emoji ];
}