Merge pull request #112 from IgnusG/concurrency

Add concurrency "toggle"

README.md

@@ -62,6 +62,23 @@ The above scrips will lint the js files while pushing to git. It will terminate
 ### With Errors
 <img src="screenshots/OutputWithErrors.gif" width="496" height="340" alt="With Erros">
 
+### Concurrent Tasks
+
+Tasks for a file group will by default run in linear order (eg. `"*.js": [ "jest", "eslint"]` will run jest first, then after it's done run eslint). 
+If you'd like to run tasks for a file group concurrently instead (eg. jest and eslint in parallel), use the `concurrent` property like so:
+
+```diff
+{
++ "lint-prepush": {
++    "tasks": {
++      "*.js": {
++        concurrent: [ "jest", "eslint" ]
++      }
++    }
++  }
+}
+```
+
 ## Built With
 
 * [NodeJs](https://nodejs.org/en/) - Framework used

utils/resolveMainTask.js

@@ -9,9 +9,9 @@ module.exports = function resolveMainTask( options = {} ) {
   return constructTaskList(options).map(task => ({
     title: `Linting ${task.fileFormat} files`,
     task: () =>
-      new Listr(resolveLintTask(task.commandList, task.fileList), {
+      new Listr(resolveLintTask(task.commandList.concurrent || task.commandList, task.fileList), {
         exitOnError: true,
-        concurrent: false
+        concurrent: Array.isArray(task.commandList.concurrent)
       }),
     skip: () => {
       if (task.fileList.length === 0) {