@temporalio/common/lib/interceptors.js

Common library for code that's used across the Client, Worker, and/or Workflow

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.composeInterceptors = composeInterceptors;
/**
 * Compose all interceptor methods into a single function.
 *
 * Calling the composed function results in calling each of the provided interceptor, in order (from the first to
 * the last), followed by the original function provided as argument to `composeInterceptors()`.
 *
 * @param interceptors a list of interceptors
 * @param method the name of the interceptor method to compose
 * @param next the original function to be executed at the end of the interception chain
 */
// ts-prune-ignore-next (imported via lib/interceptors)
function composeInterceptors(interceptors, method, next) {
    for (let i = interceptors.length - 1; i >= 0; --i) {
        const interceptor = interceptors[i];
        if (interceptor?.[method] !== undefined) {
            const prev = next;
            // We lose type safety here because Typescript can't deduce that interceptor[method] is a function that returns
            // the same type as Next<I, M>
            next = ((input) => interceptor[method](input, prev));
        }
    }
    return next;
}
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