Install using npm installed during installation of script dependencies

script/config.js

@@ -77,7 +77,7 @@ function getAppName(channel) {
   return channel === 'stable'
     ? 'Atom'
     : `Atom ${process.env.ATOM_CHANNEL_DISPLAY_NAME ||
-        channel.charAt(0).toUpperCase() + channel.slice(1)}`;
+    channel.charAt(0).toUpperCase() + channel.slice(1)}`;
 }
 
 function getExecutableName(channel, appName) {
@@ -113,8 +113,6 @@ function getApmBinPath() {
 }
 
 function getNpmBinPath(external = false) {
-  if (process.env.NPM_BIN_PATH) return process.env.NPM_BIN_PATH;
-
   const npmBinName = process.platform === 'win32' ? 'npm.cmd' : 'npm';
   const localNpmBinPath = path.resolve(
     repositoryRootPath,
@@ -123,7 +121,5 @@ function getNpmBinPath(external = false) {
     '.bin',
     npmBinName
   );
-  return !external && fs.existsSync(localNpmBinPath)
-    ? localNpmBinPath
-    : npmBinName;
+  return localNpmBinPath;
 }

script/lib/install-script-dependencies.js

@@ -10,7 +10,7 @@ process.env.ELECTRON_CUSTOM_VERSION = CONFIG.appMetadata.electronVersion;
 module.exports = function(ci) {
   console.log('Installing script dependencies');
   childProcess.execFileSync(
-    CONFIG.getNpmBinPath(ci),
+    'npm',
     ['--loglevel=error', ci ? 'ci' : 'install'],
     { env: process.env, cwd: CONFIG.scriptRootPath }
   );

script/lib/verify-machine-requirements.js

@@ -7,7 +7,7 @@ const CONFIG = require('../config');
 
 module.exports = function(ci) {
   verifyNode();
-  verifyNpm(ci);
+  // verifyNpm(ci);
   verifyPython();
 };