mirror of
https://github.com/nestjs/nest.git
synced 2026-02-21 23:11:44 +00:00
43 lines
1.4 KiB
TypeScript
43 lines
1.4 KiB
TypeScript
/* eslint-disable @typescript-eslint/no-use-before-define */
|
|
export const isUndefined = (obj: any): obj is undefined =>
|
|
typeof obj === 'undefined';
|
|
|
|
export const isObject = (fn: any): fn is object =>
|
|
!isNil(fn) && typeof fn === 'object';
|
|
|
|
export const isPlainObject = (fn: any): fn is object => {
|
|
if (!isObject(fn)) {
|
|
return false;
|
|
}
|
|
const proto = Object.getPrototypeOf(fn);
|
|
if (proto === null) {
|
|
return true;
|
|
}
|
|
const ctor =
|
|
Object.prototype.hasOwnProperty.call(proto, 'constructor') &&
|
|
proto.constructor;
|
|
return (
|
|
typeof ctor === 'function' &&
|
|
ctor instanceof ctor &&
|
|
Function.prototype.toString.call(ctor) ===
|
|
Function.prototype.toString.call(Object)
|
|
);
|
|
};
|
|
|
|
export const addLeadingSlash = (path?: string): string =>
|
|
path ? (path.charAt(0) !== '/' ? '/' + path : path) : '';
|
|
|
|
/**
|
|
* Deprecated. Use the "addLeadingSlash" function instead.
|
|
* @deprecated
|
|
*/
|
|
export const validatePath = addLeadingSlash;
|
|
|
|
export const isFunction = (fn: any): boolean => typeof fn === 'function';
|
|
export const isString = (fn: any): fn is string => typeof fn === 'string';
|
|
export const isConstructor = (fn: any): boolean => fn === 'constructor';
|
|
export const isNil = (obj: any): obj is null | undefined =>
|
|
isUndefined(obj) || obj === null;
|
|
export const isEmpty = (array: any): boolean => !(array && array.length > 0);
|
|
export const isSymbol = (fn: any): fn is symbol => typeof fn === 'symbol';
|