watch.js

const { exec } = require('child_process');

require('esbuild')
    .context({
        entryPoints: ['index.ts'],
        outdir: 'dist',
        bundle: true,
        format: 'esm',
        plugins: [
            {
                name: 'on-end',
                setup(build) {
                    build.onStart(() => {
                        console.log('Cleaning up...');
                        exec('rm -rf dist');
                    });
                    build.onEnd(() => {
                        console.log('Building types...');
                        exec('npx tsc --outDir dist');
                        console.log('Build success!');
                    });
                },
            },
        ]
    })
    .then((context) => context.watch())
    .then(() => {
        console.log('Watching...');
    });