refactor: change separate tools by category

core/stdlib/src/collections/getByPath/index.ts

@@ -0,0 +1,84 @@
+type Exist<T> = T extends undefined | null ? never : T;
+
+type ExtractFromObject<O extends Record<PropertyKey, unknown>, K> =
+  K extends keyof O
+    ? O[K]
+    : K extends keyof Exist<O>
+      ? Exist<O>[K]
+      : never;
+
+type ExtractFromArray<A extends readonly any[], K> = any[] extends A
+  ? A extends readonly (infer T)[]
+    ? T | undefined
+    : undefined
+  : K extends keyof A
+    ? A[K]
+    : undefined;
+
+type GetWithArray<O, K> = K extends []
+  ? O
+  : K extends [infer Key, ...infer Rest]
+    ? O extends Record<PropertyKey, unknown>
+      ? GetWithArray<ExtractFromObject<O, Key>, Rest>
+      : O extends readonly any[]
+        ? GetWithArray<ExtractFromArray<O, Key>, Rest>
+        : never
+    : never;
+
+type Path<T> = T extends `${infer Key}.${infer Rest}`
+  ? [Key, ...Path<Rest>]
+    : T extends `${infer Key}`
+      ? [Key]
+      : [];
+
+// Type that generate a type of a value by a path;
+// e.g. ['a', 'b', 'c'] => { a: { b: { c: PropertyKey } } }
+// e.g. ['a', 'b', 'c', 'd'] => { a: { b: { c: { d: PropertyKey } } } }
+// e.g. ['a'] => { a: PropertyKey }
+// e.g. ['a', '0'], => { a: [PropertyKey] }
+// e.g. ['a', '0', 'b'] => { a: [{ b: PropertyKey }] }
+// e.g. ['a', '0', 'b', '0'] => { a: [{ b: [PropertyKey] }] }
+// e/g/ ['0', 'a'] => [{ a: PropertyKey }]
+//
+// Input: ['a', 'b', 'c'], constrain: PropertyKey
+// Output: { a: { b: { c: PropertyKey } } }
+
+export type UnionToIntersection<Union> = (
+  Union extends unknown
+		? (distributedUnion: Union) => void
+		: never
+) extends ((mergedIntersection: infer Intersection) => void)
+	? Intersection & Union
+	: never;
+
+
+type PathToType<T extends string[]> = T extends [infer Head, ...infer Rest]
+  ? Head extends string
+    ? Head extends `${number}`
+      ? Rest extends string[]
+        ? PathToType<Rest>[]
+        : never
+      : Rest extends string[]
+        ? { [K in Head & string]: PathToType<Rest> }
+        : never
+    : never
+  : string;
+
+export type Generate<T extends string> = UnionToIntersection<PathToType<Path<T>>>;
+type Get<O, K> = GetWithArray<O, Path<K>>;
+
+export function getByPath<O, K extends string>(obj: O, path: K): Get<O, K>;
+export function getByPath(obj: Record<string, unknown>, path: string): unknown {
+  const keys = path.split('.');
+  let currentObj = obj;
+
+  for (const key of keys) {
+    const value = currentObj[key];
+
+    if (value === undefined || value === null) return undefined;
+
+    currentObj = value as Record<string, unknown>;
+  }
+
+  return currentObj;
+}