@dalet-oss/express-http-context/lib/cjs/index.js

Modern request-scoped storage support for Express.js based on Asynchronous Local Storage.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.set = exports.get = exports.middleware = void 0;
const async_hooks_1 = require("async_hooks");
if (!global.expressHttpContextStorage) {
    global.expressHttpContextStorage = new async_hooks_1.AsyncLocalStorage();
}
/**
 * Express.js middleware that is responsible for initializing the context for
 * each request.
 *
 * Declared as type 'any' because otherwise Typescript consumers can get tie
 * themselves in knots.
 */
const middleware = (_req, _res, next) => {
    global.expressHttpContextStorage.run(new Map(), () => next());
};
exports.middleware = middleware;
/**
 * Gets a value from the context by key.
 *
 * Will return undefined if the context has not yet been initialized for this
 * request, or if a value is not found for the specified key.
 */
function get(key) {
    const store = global.expressHttpContextStorage.getStore();
    return store?.get(key);
}
exports.get = get;
/**
 * Adds a value to the context by key.
 *
 * If the key already exists, its value will be overwritten.
 * No value will be persisted if the context has not yet been initialized.
 *
 * Returns the value that was set, or undefined if the context has not yet been
 * initialized for this request.
 */
function set(key, value) {
    const store = global.expressHttpContextStorage.getStore();
    if (store) {
        store.set(key, value);
        return value;
    }
    return undefined;
}
exports.set = set;
exports.default = { get, middleware: exports.middleware, set };
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