Lightning Completion is part of the [https://github.com/jhpalmieri/ultratex ultratex] repository, which also provides UltraTexMode.

===Usage===

In your .emacs file, you need the following line:

 (require 'light)

Customize via
 
 M-x customize-group lightning-completion
===About===

From the GitHub repo

  Lightning completion package
  ----------------------------------
  (Version 0.90 of 2022/07/28)
  
  The lightning completion package lets Emacs use "dynamic completion"
  on any number of things.  By dynamic completion, I mean that you don't
  need to hit the tab key to initiate completion: once it is on, it
  stays on until there is a unique completion or it is turned off.  This
  can be disconcerting at first, but once you get used to it, it is
  quite useful--especially when used with commands like find-file or
  describe-function.
  
  Please read the documenation (in the texi directory) for more
  information.
  
  The lightning completion package was written by Mark Haiman and Nick
  Reingold, then modified by John Palmieri (including getting everything
  to work with Emacs 19).  Many suggestions were made by various people
  at MIT, Yale, and elsewhere.

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CategoryCompletion