esbuild.js

import esbuild from 'esbuild';
import glob from 'glob';
import { renameSync } from 'fs';

const base = {
  entryPoints: [
    ...glob.sync('./src/**/!(*.test.ts)', {
      nodir: true,
      ignore: ['./src/tests/**/*', './src/contracts/abis/**/*'],
    }),
  ],
  bundle: false,
  sourcemap: false,
};

const esmDeclarations = glob.sync('./dist/esm/**/*.d.ts');

for (let i = 0; i < esmDeclarations.length; i++) {
  const declaration = esmDeclarations[i];
  renameSync(declaration, declaration.replace('.d.ts', '.d.mts'));
}

esbuild.build({
  ...base,
  bundle: true,
  plugins: [
    {
      name: 'add-mjs',
      setup(build) {
        build.onResolve({ filter: /.*/ }, (args) => {
          if (args.importer) {
            if (args.path.match(/^@ethersproject\/.*\//))
              return {
                path: args.path.replace('/lib/', '/lib.esm/') + '.js',
                external: true,
              };
          }
        });
      },
    },
  ],
  outdir: 'dist/esm',
  format: 'esm',
  target: ['esnext'],
  outExtension: {
    '.js': '.mjs',
  },
});

esbuild.build({
  ...base,
  plugins: [
    {
      name: 'add-js',
      setup(build) {
        build.onResolve({ filter: /.*/ }, (args) => {
          if (args.importer) {
            if (
              args.path.match(/^@ethersproject\/.*\//) ||
              args.path.startsWith('./') ||
              args.path.startsWith('../')
            )
              return { path: args.path + '.js', external: true };
            return { path: args.path, external: true };
          }
        });
      },
    },
  ],
  outdir: 'dist/cjs',
  format: 'cjs',
  target: ['node16'],
});