code: function atomSerialize () {
    var options = {isUnloading: true}
    if (atom.serialize != null) return atom.serialize(options)
  
    // Atom <= 1.6
    return {
      version: atom.constructor.version,
      project: atom.project.serialize(options),
      workspace: atom.workspace.serialize(),
      packageStates: packageStatesSerialize(),
      grammars: {grammarOverridesByPath: atom.grammars.grammarOverridesByPath},
      fullScreen: atom.isFullScreen(),
      windowDimensions: atom.windowDimensions
    }
  }
docs: shim atom.serialize in <= 1.6