🛠️ yarn -> npm, babel -> esbuild

.gitignore

@@ -4,4 +4,4 @@
 *.log
 .vscode
 .env
-package-lock.json
+yarn.lock

.prettierrc

@@ -1,4 +1,5 @@
 {
   "singleQuote": true,
-  "trailingComma": "es5"
+  "trailingComma": "es5",
+  "arrowParens":"avoid"
 }

build.js

@@ -0,0 +1,34 @@
+#!/usr/bin/env node
+
+const process = require('process');
+
+const isCI = require('is-ci');
+const fg = require('fast-glob');
+const esbuild = require('esbuild');
+
+const isEsmBuild = process.argv[2] !== '--cjs';
+
+const config = {
+  cjs: {
+    format: 'cjs',
+    platform: 'node',
+    outdir: './lib/cjs',
+  },
+  esm: {
+    outdir: './lib/esm',
+  },
+};
+
+fg('src/**/*.js', {
+  ignore: ['**/__tests__', '**/__fixtures__'],
+})
+  .then(entryPoints =>
+    esbuild.build({
+      entryPoints,
+      sourcemap: true,
+      logLevel: isCI ? 'silent' : 'info',
+      target: 'node12.13',
+      ...(isEsmBuild ? config.esm : config.cjs),
+    })
+  )
+  .catch(err => process.exit(1));

jest.config.js

@@ -0,0 +1,12 @@
+module.exports = async () => {
+  return {
+    transform: {
+      '^.+\\.jsx?$': [
+        'esbuild-jest-transform',
+        {
+          target: 'es2015',
+        },
+      ],
+    },
+  };
+};