Add concurrency=“1” flag to Lerna in AppVeyor

appveyor.yml

@@ -37,6 +37,7 @@ install:
   # TODO: Remove after https://github.com/appveyor/ci/issues/1426 is fixed
   - set PATH=C:\Program Files\Git\mingw64\bin;%PATH%
   - ps: Install-Product node $env:nodejs_version $env:platform
+  - cmd: node tasks/change-lerna-concurrency.js
 
 build: off
 

tasks/change-lerna-concurrency.js

@@ -0,0 +1,15 @@
+#!/usr/bin/env node
+'use strict';
+
+// Change Lerna concurrency to 1 in lerna.json
+
+var fs = require('fs');
+var path = require('path');
+var lernaPath = path.resolve(__dirname, '..', 'lerna.json');
+
+var lerna = JSON.parse(fs.readFileSync(lernaPath, 'utf8'));
+
+lerna.concurrency = '1';
+
+fs.renameSync(lernaPath, lernaPath + '.old');
+fs.writeFileSync(lernaPath, JSON.stringify(lerna));