sveltekit-flash-message/dist/server.js

Send temporary data to the next request after redirect. Works with both SSR and client.

import { redirect as redir } from '@sveltejs/kit';
//const d = console.debug;
// Cannot change.
const cookieName = 'flash';
export const flashCookieOptions = {
    path: '/',
    maxAge: 120,
    httpOnly: false,
    sameSite: 'strict'
};
/////////////////////////////////////////////////////////////////////
/**
 * @deprecated Renamed to loadFlash.
 */
export function loadFlashMessage(cb) {
    return loadFlash(cb);
}
/**
 * Retrieves the flash message from the previous request.
 * Use as a wrapper around a top-level load function, usually in a +layout.server.ts file.
 */
export function loadFlash(cb) {
    return async (event) => {
        const flash = _loadFlash(event).flash;
        const loadFunction = await cb(event);
        return { flash, ...loadFunction };
    };
}
export function _loadFlash(event) {
    const dataString = event.cookies.get(cookieName);
    if (!dataString) {
        //d('No flash cookie found.');
        return { [cookieName]: undefined };
    }
    let data = undefined;
    if (dataString) {
        // Detect if event is XMLHttpRequest, basically by checking if the browser
        // is honoring the sec-fetch-dest header, or accepting json.
        // event.isDataRequest is also used.
        const setFetchDest = event.request.headers.get('sec-fetch-dest');
        const accept = event.request.headers.get('accept');
        if (event.isDataRequest ||
            setFetchDest == 'empty' ||
            accept == '*/*' ||
            accept?.includes('application/json')) {
            //d('Possible fetch request, keeping cookie for client.');
        }
        else {
            //d('Flash cookie found, clearing');
            event.cookies.delete(cookieName, { path: flashCookieOptions.path ?? '/' });
        }
        try {
            data = JSON.parse(dataString);
        }
        catch (e) {
            // Ignore data if parsing error
        }
    }
    return {
        [cookieName]: data
    };
}
export const load = _loadFlash;
export function redirect(status, location, message, event) {
    switch (arguments.length) {
        case 2:
            if (typeof status === 'number') {
                return realRedirect(status, `${location}`);
            }
            else {
                const message = status;
                const event = location;
                // Remove the named action, if it exists
                const redirectUrl = new URL(event.url);
                for (const [key] of redirectUrl.searchParams) {
                    if (key.startsWith('/')) {
                        redirectUrl.searchParams.delete(key);
                    }
                    break;
                }
                return realRedirect(303, redirectUrl, message, event);
            }
        case 3:
            return realRedirect(303, status, location, message);
        case 4:
            return realRedirect(status, location, message, event);
        default:
            throw new Error('Invalid redirect arguments');
    }
}
function realRedirect(status, location, message, event) {
    if (!message)
        return redir(status, location.toString());
    if (!event)
        throw new Error('RequestEvent is required for redirecting with flash message');
    const cookies = 'cookies' in event ? event.cookies : event;
    cookies.set(cookieName, JSON.stringify(message), {
        ...flashCookieOptions,
        path: flashCookieOptions.path ?? '/'
    });
    return redir(status, location.toString());
}
////////////////////////////////////////////////////////
/**
 * Set the flash message without redirecting, for example when validation fails in a form action.
 * @param {App.PageData['flash']} message The flash message.
 * @param {RequestEvent} event The event for the form action or load function.
 */
export function setFlash(message, event) {
    const cookies = 'cookies' in event ? event.cookies : event;
    cookies.set(cookieName, JSON.stringify(message), {
        ...flashCookieOptions,
        path: flashCookieOptions.path ?? '/'
    });
}