@sentry/utils/esm/is.js

Utilities for all Sentry JavaScript SDKs

var objectToString = Object.prototype.toString;

/**
 * Checks whether given value's type is one of a few Error or Error-like
 * {@link isError}.
 *
 * @param wat A value to be checked.
 * @returns A boolean representing the result.
 */
function isError(wat) {
  switch (objectToString.call(wat)) {
    case '[object Error]':
    case '[object Exception]':
    case '[object DOMException]':
      return true;
    default:
      return isInstanceOf(wat, Error);
  }
}

function isBuiltin(wat, ty) {
  return objectToString.call(wat) === `[object ${ty}]`;
}

/**
 * Checks whether given value's type is ErrorEvent
 * {@link isErrorEvent}.
 *
 * @param wat A value to be checked.
 * @returns A boolean representing the result.
 */
function isErrorEvent(wat) {
  return isBuiltin(wat, 'ErrorEvent');
}

/**
 * Checks whether given value's type is DOMError
 * {@link isDOMError}.
 *
 * @param wat A value to be checked.
 * @returns A boolean representing the result.
 */
function isDOMError(wat) {
  return isBuiltin(wat, 'DOMError');
}

/**
 * Checks whether given value's type is DOMException
 * {@link isDOMException}.
 *
 * @param wat A value to be checked.
 * @returns A boolean representing the result.
 */
function isDOMException(wat) {
  return isBuiltin(wat, 'DOMException');
}

/**
 * Checks whether given value's type is a string
 * {@link isString}.
 *
 * @param wat A value to be checked.
 * @returns A boolean representing the result.
 */
function isString(wat) {
  return isBuiltin(wat, 'String');
}

/**
 * Checks whether given value is a primitive (undefined, null, number, boolean, string, bigint, symbol)
 * {@link isPrimitive}.
 *
 * @param wat A value to be checked.
 * @returns A boolean representing the result.
 */
function isPrimitive(wat) {
  return wat === null || (typeof wat !== 'object' && typeof wat !== 'function');
}

/**
 * Checks whether given value's type is an object literal
 * {@link isPlainObject}.
 *
 * @param wat A value to be checked.
 * @returns A boolean representing the result.
 */
function isPlainObject(wat) {
  return isBuiltin(wat, 'Object');
}

/**
 * Checks whether given value's type is an Event instance
 * {@link isEvent}.
 *
 * @param wat A value to be checked.
 * @returns A boolean representing the result.
 */
function isEvent(wat) {
  return typeof Event !== 'undefined' && isInstanceOf(wat, Event);
}

/**
 * Checks whether given value's type is an Element instance
 * {@link isElement}.
 *
 * @param wat A value to be checked.
 * @returns A boolean representing the result.
 */
function isElement(wat) {
  return typeof Element !== 'undefined' && isInstanceOf(wat, Element);
}

/**
 * Checks whether given value's type is an regexp
 * {@link isRegExp}.
 *
 * @param wat A value to be checked.
 * @returns A boolean representing the result.
 */
function isRegExp(wat) {
  return isBuiltin(wat, 'RegExp');
}

/**
 * Checks whether given value has a then function.
 * @param wat A value to be checked.
 */
function isThenable(wat) {
    return Boolean(wat && wat.then && typeof wat.then === 'function');
}

/**
 * Checks whether given value's type is a SyntheticEvent
 * {@link isSyntheticEvent}.
 *
 * @param wat A value to be checked.
 * @returns A boolean representing the result.
 */
function isSyntheticEvent(wat) {
  return isPlainObject(wat) && 'nativeEvent' in wat && 'preventDefault' in wat && 'stopPropagation' in wat;
}

/**
 * Checks whether given value is NaN
 * {@link isNaN}.
 *
 * @param wat A value to be checked.
 * @returns A boolean representing the result.
 */
function isNaN(wat) {
  return typeof wat === 'number' && wat !== wat;
}

/**
 * Checks whether given value's type is an instance of provided constructor.
 * {@link isInstanceOf}.
 *
 * @param wat A value to be checked.
 * @param base A constructor to be used in a check.
 * @returns A boolean representing the result.
 */
function isInstanceOf(wat, base) {
  try {
    return wat instanceof base;
  } catch (_e) {
    return false;
  }
}

export { isDOMError, isDOMException, isElement, isError, isErrorEvent, isEvent, isInstanceOf, isNaN, isPlainObject, isPrimitive, isRegExp, isString, isSyntheticEvent, isThenable };
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