sveltekit-flash-message/dist/flashMessage.js

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

import { browser } from '$app/environment';
import { defaultOptions } from './options.js';
export class FlashMessage {
    options;
    _message;
    get message() {
        return this._message;
    }
    _flashTimeout = 0;
    get flashTimeout() {
        return this._flashTimeout;
    }
    constructor(message, options) {
        this.options = options ?? defaultOptions;
        this._message = {
            subscribe: message.subscribe,
            set: (value, options) => message.update(($message) => this.update($message, value, options?.concatenateArray ?? false)),
            update: (updater, options) => message.update(($message) => this.update($message, updater($message), options?.concatenateArray ?? false))
        };
    }
    update(current, newData, concatenateArray = false) {
        if (this._flashTimeout)
            clearTimeout(this.flashTimeout);
        // Need to do a per-element comparison here, since update will be called
        // when going to the same route, while keeping the old flash message,
        // making it display multiple times.
        if (concatenateArray && Array.isArray(newData)) {
            if (Array.isArray(current)) {
                if (current.length > 0 &&
                    newData.length > 0 &&
                    current[current.length - 1] === newData[newData.length - 1]) {
                    return current;
                }
                else {
                    return current.concat(newData);
                }
            }
        }
        if (browser && newData !== undefined && this.options.clearAfterMs) {
            this._flashTimeout = setTimeout(() => {
                this.message.set(undefined);
            }, this.options.clearAfterMs);
        }
        return newData;
    }
}