63 lines
1.4 KiB
TypeScript
63 lines
1.4 KiB
TypeScript
/**
|
|
* Toolkit - Type Guards
|
|
*
|
|
* Type guard utilities for runtime type checking.
|
|
*/
|
|
|
|
/**
|
|
* Check if value is a non-null object
|
|
*/
|
|
export function isObject(value: unknown): value is Record<string, unknown> {
|
|
return typeof value === "object" && value !== null && !Array.isArray(value);
|
|
}
|
|
|
|
/**
|
|
* Check if value is a non-empty array
|
|
*/
|
|
export function isNonEmptyArray<T>(value: unknown): value is [T, ...T[]] {
|
|
return Array.isArray(value) && value.length > 0;
|
|
}
|
|
|
|
/**
|
|
* Check if value is a string
|
|
*/
|
|
export function isString(value: unknown): value is string {
|
|
return typeof value === "string";
|
|
}
|
|
|
|
/**
|
|
* Check if value is a number
|
|
*/
|
|
export function isNumber(value: unknown): value is number {
|
|
return typeof value === "number" && !isNaN(value);
|
|
}
|
|
|
|
/**
|
|
* Check if value is a boolean
|
|
*/
|
|
export function isBoolean(value: unknown): value is boolean {
|
|
return typeof value === "boolean";
|
|
}
|
|
|
|
/**
|
|
* Check if value is null or undefined
|
|
*/
|
|
export function isNullish(value: unknown): value is null | undefined {
|
|
return value === null || value === undefined;
|
|
}
|
|
|
|
/**
|
|
* Check if value is defined (not null or undefined)
|
|
*/
|
|
export function isDefined<T>(value: T | null | undefined): value is T {
|
|
return value !== null && value !== undefined;
|
|
}
|
|
|
|
/**
|
|
* Filter out null/undefined values from array
|
|
*/
|
|
export function filterDefined<T>(arr: (T | null | undefined)[]): T[] {
|
|
return arr.filter(isDefined);
|
|
}
|
|
|