ayanami/esnext/ssr/express.js

A better way to react with state

import { skip } from 'rxjs/operators';
import { SSRSymbol } from './constants';
import { isSSREnabled } from './flag';
import { Effect } from '../core/decorators';
export const SKIP_SYMBOL = Symbol('skip');
export const reqMap = new Map();
function addDecorator(target, method, middleware) {
    const existedMetas = Reflect.getMetadata(SSRSymbol, target);
    const meta = { action: method, middleware };
    if (existedMetas) {
        existedMetas.push(meta);
    }
    else {
        Reflect.defineMetadata(SSRSymbol, [meta], target);
    }
}
// eslint-disable-next-line @typescript-eslint/explicit-module-boundary-types
export function SSREffect(options) {
    const { payloadGetter, skipFirstClientDispatch } = {
        payloadGetter: undefined,
        skipFirstClientDispatch: true,
        ...options,
    };
    return (target, method, descriptor) => {
        addDecorator(target, method, payloadGetter);
        if (!isSSREnabled() && skipFirstClientDispatch) {
            const originalValue = descriptor.value;
            descriptor.value = function (action$, state$) {
                if (Reflect.getMetadata(this.ssrLoadKey, this)) {
                    return originalValue.call(this, action$.pipe(skip(1)), state$);
                }
                return originalValue.call(this, action$, state$);
            };
        }
        return Effect()(target, method, descriptor);
    };
}