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

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

import { AsyncLocalStorage } from 'async_hooks';
if (!global.expressHttpContextStorage) {
    global.expressHttpContextStorage = new 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.
 */
export const middleware = (_req, _res, next) => {
    global.expressHttpContextStorage.run(new Map(), () => next());
};
/**
 * 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.
 */
export function get(key) {
    const store = global.expressHttpContextStorage.getStore();
    return store?.get(key);
}
/**
 * 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.
 */
export function set(key, value) {
    const store = global.expressHttpContextStorage.getStore();
    if (store) {
        store.set(key, value);
        return value;
    }
    return undefined;
}
export default { get, middleware, set };
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