envoc-form/src/utils/typeChecks.ts

Envoc form components

export const isUndefined = (value: any) => value === undefined;
export const isNull = (value: any) => value === null;
export const isBoolean = (value: any) => typeof value === 'boolean';
export const isObject = (value: any) => value === Object(value);
export const isArray = (value: any) => Array.isArray(value);
export const isDate = (value: any) => value instanceof Date;

export const isBlob = (value: any) =>
  value &&
  typeof value.size === 'number' &&
  typeof value.type === 'string' &&
  typeof value.slice === 'function';

export const isFile = (value: any) =>
  isBlob(value) &&
  typeof value.name === 'string' &&
  (typeof value.lastModifiedDate === 'object' ||
    typeof value.lastModified === 'number');