datum-focus/src/function.ts

Data shape, model, metadata, JSON, JSON Schema, GraphQL, MongoDB query and aggregations, iterator generators

export const FUNCTION = "function";

export const isFunction = (val: unknown): val is Function =>
  typeof val === FUNCTION;

export type FunctionPropertyNames<T> = {
  [K in keyof T]: T[K] extends Function ? K : never;
}[keyof T];

export type FunctionProperties<T> = Pick<T, FunctionPropertyNames<T>>;

export type NonFunctionPropertyNames<T> = {
  [K in keyof T]: T[K] extends Function ? never : K;
}[keyof T];

export type NonFunctionProperties<T> = Pick<T, NonFunctionPropertyNames<T>>;