Suppress deprecations in BufferedNodeProcess

This keeps it consistent with the render process which also suppresses
deprecations

Closes #5383

spec/buffered-node-process-spec.coffee

@@ -0,0 +1,39 @@
+path = require 'path'
+BufferedNodeProcess  = require '../src/buffered-node-process'
+
+describe "BufferedNodeProcess", ->
+  it "executes the script in a new process", ->
+    exit = jasmine.createSpy('exitCallback')
+    output = ''
+    stdout = (lines) -> output += lines
+    error = ''
+    stderr = (lines) -> error += lines
+    args = ['hi']
+    command = path.join(__dirname, 'fixtures', 'script.js')
+
+    new BufferedNodeProcess({command, args, stdout, stderr, exit})
+
+    waitsFor ->
+      exit.callCount is 1
+
+    runs ->
+      expect(output).toBe 'hi'
+      expect(error).toBe ''
+      expect(args).toEqual ['hi']
+
+  it "suppresses deprecations in the new process", ->
+    exit = jasmine.createSpy('exitCallback')
+    output = ''
+    stdout = (lines) -> output += lines
+    error = ''
+    stderr = (lines) -> error += lines
+    command = path.join(__dirname, 'fixtures', 'script-with-deprecations.js')
+
+    new BufferedNodeProcess({command, stdout, stderr, exit})
+
+    waitsFor ->
+      exit.callCount is 1
+
+    runs ->
+      expect(output).toBe 'hi'
+      expect(error).toBe ''

spec/fixtures/script-with-deprecations.js

@@ -0,0 +1,2 @@
+require('fs').existsSync('hi');
+process.stdout.write('hi');

spec/fixtures/script.js

@@ -0,0 +1 @@
+process.stdout.write(process.argv[2]);

src/buffered-node-process.coffee

@@ -48,5 +48,8 @@ class BufferedNodeProcess extends BufferedProcess
     options.env ?= Object.create(process.env)
     options.env['ATOM_SHELL_INTERNAL_RUN_AS_NODE'] = 1
 
+    args = args?.slice() ? []
     args.unshift(command)
+    args.unshift('--no-deprecation')
+
     super({command: node, args, options, stdout, stderr, exit})