[IMP] rollup: properly indent generated files (#774)

Also lint rollup.config.js

rollup.config.js

@@ -3,26 +3,26 @@ import git from "git-rev-sync";
 import typescript from 'rollup-plugin-typescript2';
 import { terser } from "rollup-plugin-terser";
 
-const name = "owl"
-const extend = true
+const name = "owl";
+const extend = true;
 
 /**
- * Meta data to be added on the __info__ object. 
+ * Meta data to be added on the __info__ object.
  * Used to let external tools know the current owl version.
  */
-const outro =  `
+const outro = `
 __info__.version = '${pkg.version}';
 __info__.date = '${new Date().toISOString()}';
 __info__.hash = '${git.short()}';
 __info__.url = 'https://github.com/odoo/owl';
-`
+`;
 
 /**
  * Generate from a string depicting a path a new path for the minified version.
- * @param {string} pkgFileName file name 
+ * @param {string} pkgFileName file name
  */
 function generateMinifiedNameFromPkgName(pkgFileName) {
-  const parts = pkgFileName.split('.')
+  const parts = pkgFileName.split('.');
   parts.splice(parts.length - 1, 0, "min");
   return parts.join('.');
 }
@@ -40,8 +40,9 @@ function getConfigForFormat(format, generatedFileName, minified = false) {
     name: name,
     extend: extend,
     outro: outro,
-    plugins: minified ? [terser()] : []
-  }
+    plugins: minified ? [terser()] : [],
+    indent: '    ', // indent with 4 spaces
+  };
 }
 
 export default {