Build script using esbuild and ts-morph to bundle library code.

build.mjs

import glob from 'fast-glob'
import { build } from 'esbuild'
import { Project } from 'ts-morph'

const project = new Project({
  compilerOptions: {
    outDir: 'dist',
    emitDeclarationOnly: true,
  },
  tsConfigFilePath: './tsconfig.json',
})

project.emit()

build({
  entryPoints: await glob(['src/**/*.{ts,tsx}', '!src/**/*.test.ts']),
  outdir: 'dist',
  format: 'esm',
  watch: process.argv.includes('--watch')
    ? {
        onRebuild: async (error) => {
          if (error) {
            console.error('watch build failed:', error)
          } else {
            await Promise.all(
              project
                .getSourceFiles()
                .map((sourceFile) => sourceFile.refreshFromFileSystem())
            )
            project.emit()
          }
        },
      }
    : undefined,
})