1import { snakeCase } from "case-anything";
 2
 3// https://stackoverflow.com/questions/60269936/typescript-convert-generic-object-from-snake-to-camel-case
 4
 5// Typescript magic to convert any string from camelCase to snake_case at compile time
 6type SnakeCase<S> = S extends string
 7  ? S extends `${infer T}${infer U}`
 8    ? `${T extends Capitalize<T> ? "_" : ""}${Lowercase<T>}${SnakeCase<U>}`
 9    : S
10  : S;
11
12type SnakeCased<Type> = {
13  [Property in keyof Type as SnakeCase<Property>]: SnakeCased<Type[Property]>;
14};
15
16export default function snakeCaseTree<T>(object: T): SnakeCased<T> {
17  const snakeObject: any = {};
18  for (const key in object) {
19    snakeObject[snakeCase(key, { keepSpecialCharacters: true })] =
20      snakeCaseValue(object[key]);
21  }
22  return snakeObject;
23}
24
25function snakeCaseValue(value: any): any {
26  if (typeof value === "object") {
27    if (Array.isArray(value)) {
28      return value.map(snakeCaseValue);
29    } else {
30      return snakeCaseTree(value);
31    }
32  } else {
33    return value;
34  }
35}