Refactor code structure for improved readability and maintainability

client/node_modules/postcss/lib/fromJSON.d.ts

@@ -0,0 +1,9 @@
+import { JSONHydrator } from './postcss.js'
+
+interface FromJSON extends JSONHydrator {
+  default: FromJSON
+}
+
+declare const fromJSON: FromJSON
+
+export = fromJSON