fix(make-spawn-args): allow overriding npm_ env vars via env

Author: legobeat

lib/make-spawn-args.js

@@ -27,10 +27,10 @@ const makeSpawnArgs = options => {
   const spawnEnv = setPATH(path, binPaths, {
     // we need to at least save the PATH environment var
     ...process.env,
-    ...env,
     npm_package_json: resolve(path, 'package.json'),
     npm_lifecycle_event: event,
     npm_lifecycle_script: cmd,
+    ...env,
   })
   /* istanbul ignore next */
   if (typeof npm_config_node_gyp === 'string') {