RocketChat/Rocket.Chat

import { t } from '../../app/utils/lib/i18n';

const isObject = (obj: unknown): obj is object => (typeof obj === 'object' || typeof obj === 'function') && obj !== null;

const hasProperty = <TProperty extends number | string | symbol>(
    obj: unknown,
    property: TProperty,
): obj is { [key in TProperty]: unknown } => isObject(obj) && property in obj;

const hasXHR = (
    error: object,
): error is {
    xhr: {
        responseJSON: {
            error: string;
            status: string;
            messages: string[];
            payload?: any;
        };
    };
} => hasProperty(error, 'xhr') && hasProperty(error.xhr, 'responseJSON');

export function getErrorMessage(error: unknown, defaultMessage?: string): string {
    if (typeof error === 'string') {
        return t(error);
    }

    if (!isObject(error)) {
        if (defaultMessage) return getErrorMessage(defaultMessage);

        throw new TypeError('no default error message specified');
    }

    if (hasXHR(error)) {
        return getErrorMessage(error.xhr.responseJSON, defaultMessage);
    }

    const message =
        (hasProperty(error, 'reason') && typeof error.reason === 'string' ? error.reason : undefined) ??
        (hasProperty(error, 'error') && typeof error.error === 'string' ? error.error : undefined) ??
        (hasProperty(error, 'message') && typeof error.message === 'string' ? error.message : undefined) ??
        defaultMessage;
    const details = hasProperty(error, 'details') && isObject(error.details) ? error.details : undefined;

    if (message) return t(message, Object.fromEntries(Object.entries(details ?? {}).map(([key, value]) => [key, t(value)])));

    return getErrorMessage(defaultMessage);
}