How to set .jl (Julia) as the default file format while opening a new file in Atom (Juno)

Copy paste the following code into your init.coffee file:

atom.workspace.observeTextEditors (editor) ->
    original = editor.getGrammar()
    if original? and original is atom.grammars.grammarForScopeName('text.plain.null-grammar')
      editor.setGrammar(atom.grammars.grammarForScopeName('source.julia')))

You should be able to find the init.coffee file by going to Files –> Init Script..

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