feat: add utils

Author: pengzhanbo

src/utils.ts

@@ -0,0 +1,25 @@
+export type Unprefix<T extends Record<string, any>, Pre extends string> = {
+  [K in keyof T as K extends `${Pre}${infer U}` ? U : never]: T[K];
+}
+
+export type Prefix<T extends Record<string, any>, Pre extends string> = {
+  // @ts-expect-error K in keyof T
+  [K in keyof T as `${Pre}${K}`]: T[K];
+}
+
+export type RenamePrefix<
+  T extends Record<string, any>,
+  Old extends string,
+  New extends string,
+> = Prefix<Unprefix<T, Old>, New>
+
+/**
+ * A literal type that supports custom further strings but preserves autocompletion in IDEs.
+ *
+ * @see [copied from issue](https://github.com/microsoft/TypeScript/issues/29729#issuecomment-471566609)
+ */
+export type LiteralUnion<Union extends Base, Base = string> =
+  | Union
+  | (Base & { zz_IGNORE_ME?: never })
+
+export type RegExpLike = RegExp | `/${string}/`