dynamodb-toolbox/dist/cjs/schema/types/pathUtils.d.ts

Lightweight and type-safe query builder for DynamoDB and TypeScript.

/**
 * Given a list of possible attribute keys & filtered attribute paths, returns the possible attribute keys.
 *
 * @example MatchKey<"foo" | "bar" | "baz", "foo.prop" | `['bar']`> => "foo" | "bar"
 */
export type MatchKeys<KEYS extends string, PATHS extends string, KEY_PREFIX extends string = '.'> = KEYS extends infer KEY ? KEY extends string ? PATHS extends `['${KEY}']${string}` | `${KEY_PREFIX}${KEY}${string}` ? KEY : never : never : never;
export type ChildPaths<KEY extends string, PATHS extends string, KEY_PREFIX extends string = '.'> = `${KEY_PREFIX}${KEY}` extends PATHS ? undefined : `['${KEY}']` extends PATHS ? undefined : PATHS extends `['${KEY}']${infer CHILD_PATHS}` | `${KEY_PREFIX}${KEY}${infer CHILD_PATHS}` ? CHILD_PATHS : never;