Editing a snippet in a package in Atom

In Atom, if a package contains snippets, how do you edit them or delete/deactivate some whilst keeping the rest?

I know I can disable the snippets and copy them into Atom->File->Snippets. However, I think that these snippets would exist for all languages whereas packages like languages-html and languages-latex only activate snippets when their respective language is being used. Is there another way?

Solution

Snippets defined in snippets.cson take precedence over all snippets provided by packages, because they are loaded later. You can copy & paste the snippets you want to edit to that file and make your edits. Snippets will be limited to the language grammar you specify in the top-level property.

Example

'.source.js':
  'console.log':
    'prefix': 'log'
    'body': 'Unexpectedly, this does not expand to console.log'

This will override the default snippet, which expands log to console.log