declare module '@ember/test-helpers/validate-error-handler' {
type ErrorHandlerValidation = Readonly<{
    isValid: true;
    message: null;
}> | Readonly<{
    isValid: false;
    message: string;
}>;
/**
 * Validate the provided error handler to confirm that it properly re-throws
 * errors when `Ember.testing` is true.
 *
 * This is intended to be used by test framework hosts (or other libraries) to
 * ensure that `Ember.onerror` is properly configured. Without a check like
 * this, `Ember.onerror` could _easily_ swallow all errors and make it _seem_
 * like everything is just fine (and have green tests) when in reality
 * everything is on fire...
 *
 * @public
 * @param {Function} [callback=Ember.onerror] the callback to validate
 * @returns {Object} object with `isValid` and `message`
 *
 * @example <caption>Example implementation for `ember-qunit`</caption>
 *
 * import { validateErrorHandler } from '@ember/test-helpers';
 *
 * test('Ember.onerror is functioning properly', function(assert) {
 *   let result = validateErrorHandler();
 *   assert.ok(result.isValid, result.message);
 * });
 */
export default function validateErrorHandler(callback?: Function | undefined): ErrorHandlerValidation;
export {};
//# sourceMappingURL=validate-error-handler.d.ts.map
}