Do not watch any files in run mode

[flotwig]

Fixes #4283

Files are watched in 3 places:

• In openProject, getSpecChanges watches files to see if any are added or removed:

  cypress/packages/server/lib/open_project.coffee

  Lines 142 to 153 in 4bd3cf2

  	createSpecsWatcher = (cfg) ->
  	return if specsWatcher
  	debug("watch test files: %s in %s", cfg.testFiles, cfg.integrationFolder)
  	specsWatcher = chokidar.watch(cfg.testFiles, {
  	cwd: cfg.integrationFolder
  	ignored: cfg.ignoreTestFiles
  	ignoreInitial: true
  	})
  	specsWatcher.on("add", checkForSpecUpdates)
  	specsWatcher.on("unlink", checkForSpecUpdates)

  • This is only called from gui/events for desktop-gui, so it does not run in run mode:

    cypress/packages/server/lib/gui/events.coffee

    Line 234 in 4bd3cf2

    openProject.getSpecChanges({

• In project, cypress.json, cypress.env.json, and the pluginsFile are watched
  • pluginsFile is watched in run mode, so added a guard - normally watches all files in dependency tree outside of node_modules:

    cypress/packages/server/lib/watchers.coffee

    Lines 40 to 46 in a389a51

    	watchTree: (filePath, options = {}) ->
    	files = dependencyTree.toList({
    	filename: filePath
    	directory: process.cwd()
    	filter: (filePath) ->
    	filePath.indexOf("node_modules") is -1
    	})

• by the bundler itself
  • shouldWatch: false is passed in run mode which tells the preprocessor not to use watchify