remix-utils/build/server/middleware/cors.js

This package contains simple utility functions to use with [React Router](https://reactrouter.com/).

import { CORS } from "../cors.js";
/**
 * Creates a middleware function that applies CORS headers to the response.
 *
 * You can customize the CORS options by passing an object with the following
 * properties:
 * - origin: The origin(s) allowed to access the resource. This can be a
 *  string, boolean, or an array of strings or regular expressions.
 * - methods: The HTTP methods allowed for cross-origin requests.
 * - allowedHeaders: The headers allowed in the request.
 * - exposedHeaders: The headers exposed to the client.
 * - credentials: Whether to include credentials in the request.
 * - maxAge: The maximum age of the preflight request in seconds.
 *
 * @param options Optional configuration for CORS
 * @returns A middleware function that applies CORS headers
 */
export function unstable_createCorsMiddleware(options) {
    let cors = new CORS(options);
    return [
        async function corsMiddleware({ request }, next) {
            let response = await next();
            return await cors.exec(request, response);
        },
    ];
}
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