chore(gitignore): Structure the gitignore file

.gitignore

@@ -1,10 +1,27 @@
+# Operating system related files
 *~
 .fuse_hidden*
 .directory
 .Trash-*
-/.idea
-/node_modules/
+
+# Intellij ide files
+.idea
+
+# Ignore environment file, use env.json.example instead
 config/env.json
 
-/**/*.js
+# Ignore package manager files
+node_modules/
 package-lock.json
+
+# Ignore everything related to test output
+reports
+.nyc_output
+
+# Ignore javascript files, sourcemaps and type declarations
+src/**/*.js
+test/**/*.js
+src/**/*.d.ts
+test/**/*.d.ts
+src/**/*.js.map
+test/**/*.js.map