graphql-ws/lib/utils.mjs

Coherent, zero-dependency, lazy, simple, GraphQL over WebSocket Protocol compliant server and client

/** @private */
export function extendedTypeof(val) {
    if (val === null) {
        return 'null';
    }
    if (Array.isArray(val)) {
        return 'array';
    }
    return typeof val;
}
/** @private */
export function isObject(val) {
    return extendedTypeof(val) === 'object';
}
/** @private */
export function isAsyncIterable(val) {
    return typeof Object(val)[Symbol.asyncIterator] === 'function';
}
/** @private */
export function isAsyncGenerator(val) {
    return (isObject(val) &&
        typeof Object(val)[Symbol.asyncIterator] === 'function' &&
        typeof val.return === 'function'
    // for lazy ones, we only need the return anyway
    // typeof val.throw === 'function' &&
    // typeof val.next === 'function'
    );
}
/** @private */
export function areGraphQLErrors(obj) {
    return (Array.isArray(obj) &&
        // must be at least one error
        obj.length > 0 &&
        // error has at least a message
        obj.every((ob) => 'message' in ob));
}
/**
 * Limits the WebSocket close event reason to not exceed a length of one frame.
 * Reference: https://datatracker.ietf.org/doc/html/rfc6455#section-5.2.
 *
 * @private
 */
export function limitCloseReason(reason, whenTooLong) {
    return reason.length < 124 ? reason : whenTooLong;
}