siegel/lib/core/client_build/plugins/plugin_sw.js

Web application development ecosystem

import fs from 'fs';
import path from 'path';
import webpack from 'webpack';
import ts from 'typescript';
const { sources, Compilation } = webpack;
const NAME = 'siegel-sw-plugin';
const serviceWorkerPlugin = function (entry) {
    const filename = path.basename(entry);
    const swContent = fs.readFileSync(entry, 'utf8');
    this.apply = function (compiler) {
        compiler.hooks.thisCompilation.tap(NAME, compilation => {
            compilation.hooks.processAssets.tap({
                name: NAME,
                stage: Compilation.PROCESS_ASSETS_STAGE_SUMMARIZE
            }, assets => {
                const SW_ASSETS = JSON.stringify(Object.keys(assets));
                const isTS = filename.endsWith('.ts');
                const SW_SOURCE = `const buildOutput=${SW_ASSETS};${isTS ? ts.transpile(swContent) : swContent}`;
                compilation.emitAsset(isTS ? filename.replace('.ts', '.js') : filename, new sources.RawSource(SW_SOURCE, true));
            });
        });
    };
};
export default serviceWorkerPlugin;