72 lines
1.4 KiB
TypeScript
72 lines
1.4 KiB
TypeScript
/**
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* Toolkit - Type Helpers
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*
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* TypeScript utility types and helper functions.
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*/
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/**
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* Make specific properties optional
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*/
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export type PartialBy<T, K extends keyof T> = Omit<T, K> & Partial<Pick<T, K>>;
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/**
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* Make specific properties required
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*/
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export type RequiredBy<T, K extends keyof T> = Omit<T, K> & Required<Pick<T, K>>;
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/**
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* Deep partial (makes all nested properties optional)
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*/
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export type DeepPartial<T> = T extends object
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? { [P in keyof T]?: DeepPartial<T[P]> }
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: T;
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/**
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* Extract keys of a certain type
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*/
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export type KeysOfType<T, U> = {
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[K in keyof T]: T[K] extends U ? K : never;
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}[keyof T];
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/**
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* Ensure all keys of a type are present
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*/
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export function ensureKeys<T extends Record<string, unknown>>(
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obj: Partial<T>,
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keys: (keyof T)[]
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): obj is T {
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return keys.every(key => key in obj);
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}
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/**
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* Pick properties by value type
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*/
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export type PickByValue<T, V> = Pick<
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T,
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{
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[K in keyof T]: T[K] extends V ? K : never;
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}[keyof T]
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>;
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/**
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* Safely access nested property
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*/
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export function getNestedProperty<T>(
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obj: unknown,
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path: string,
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defaultValue?: T
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): T | undefined {
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const keys = path.split(".");
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let current: any = obj;
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for (const key of keys) {
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if (current === null || current === undefined || typeof current !== "object") {
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return defaultValue;
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}
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current = current[key];
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}
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return current ?? defaultValue;
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}
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