@appsemble/node-utils/server/routes/appRouter/serviceWorkerHandler.js

NodeJS utilities used by Appsemble internally.

import { readFile } from 'node:fs/promises';
import { assertKoaCondition } from '@appsemble/node-utils';
import { getAppBlocks } from '@appsemble/utils';
export function createServiceWorkerHandler({ getApp, getBlocksAssetsPaths }) {
    return async (ctx) => {
        const production = process.env.NODE_ENV === 'production';
        const filename = production ? '/service-worker.js' : '/app/service-worker.js';
        const serviceWorker = await (production
            ? readFile(new URL('../../../../../dist/app/service-worker.js', import.meta.url), 'utf8')
            : ctx.fs.promises.readFile(filename, 'utf8'));
        const app = await getApp({ context: ctx });
        assertKoaCondition(app != null, ctx, 404, 'App does not exist.');
        const identifiableBlocks = getAppBlocks(app.definition);
        const blocksAssetsPaths = await getBlocksAssetsPaths({ identifiableBlocks, context: ctx });
        ctx.body = `const blockAssets=${JSON.stringify(blocksAssetsPaths)};${serviceWorker}`;
        ctx.type = 'application/javascript';
    };
}
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