How to use the metro.loadConfig function in metro
To help you get started, we’ve selected a few metro examples, based on popular ways it is used in public projects.
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facebook / metro / packages / metro-visualizer / src / middleware / routes.js View on Github 
router.use('/bundle.js', async (req, res, next) => {
const status = 'Bundling visualizer app';
const options = {
dev: true,
entry: './src/app/index.js',
minify: false,
platform: 'web',
};
const config = await metro.loadConfig({
config: require.resolve('./build-utils/metro.config.js'),
});
await metro
.runBuild(config, options)
.then((val: {code: string, map: string}) => {
terminal.status(`${status}... serving`);
res.writeHead(200, {'Content-Type': 'text/javascript'});
res.write(val.code);
res.end();
terminal.status(`${status}, done.`);
terminal.persistStatus();
})
.catch(error => {metro
🚇 The JavaScript bundler for React Native.
