@toolchain-js/toolchain-rollup-bundler/bin/rollup-bundler.js

The example Toolchain CLI toolchain for bundling libraries with Rollup.

#!/usr/bin/env node
'use strict';

// Makes the script crash on unhandled rejections instead of silently
// ignoring them. In the future, promise rejections that are not handled will
// terminate the Node.js process with a non-zero exit code.
process.on('unhandledRejection', err => {
    throw err;
});

const spawn = require('cross-spawn');
const args = process.argv.slice(2);

const scriptIndex = args.findIndex(
    x => x === 'start' || x === 'build' || x === 'eject',
);
const script = scriptIndex === -1 ? args[0] : args[scriptIndex];
const nodeArgs = scriptIndex > 0 ? args.slice(0, scriptIndex) : [];

if (['start', 'build', 'eject'].includes(script)) {
    const result = spawn.sync(
        'node',
        nodeArgs
            .concat(require.resolve('../scripts/' + script))
            .concat(args.slice(scriptIndex + 1)),
        {stdio: 'inherit'},
    );
    if (result.signal) {
        if (result.signal === 'SIGKILL') {
            console.log(
                'The build failed because the process exited too early. ' +
                'This probably means the system ran out of memory or someone called ' +
                '`kill -9` on the process.',
            );
        } else if (result.signal === 'SIGTERM') {
            console.log(
                'The build failed because the process exited too early. ' +
                'Someone might have called `kill` or `killall`, or the system could ' +
                'be shutting down.',
            );
        }
        process.exit(1);
    }
    process.exit(result.status);
} else {
    console.log('Unknown script "' + script + '".');
}