added babel config

Author: bennobuilder

package.json

@@ -50,6 +50,7 @@
     "@babel/cli": "^7.15.7",
     "@babel/core": "^7.15.5",
     "@babel/preset-env": "^7.15.6",
+    "@babel/preset-typescript": "^7.15.0",
     "@changesets/cli": "^2.16.0",
     "@rollup/plugin-babel": "^5.3.0",
     "@rollup/plugin-node-resolve": "^13.0.4",

packages/babel.config.js

@@ -0,0 +1,11 @@
+// https://babeljs.io/docs/en/config-files#config-function-api
+export default function getBabelConfig() {
+  return {
+    ignore: ['./node_modules'],
+    presets: [
+      '@babel/preset-env',
+      '@babel/preset-typescript',
+    ],
+    plugins: ['@babel/plugin-transform-typescript'],
+  };
+}

packages/rollup.config.default.js

@@ -7,9 +7,20 @@ import { nodeResolve } from '@rollup/plugin-node-resolve'; // https://rollupjs.o
 import esbuild from 'rollup-plugin-esbuild';
 import typescript from '@rollup/plugin-typescript';
 import bundleSize from 'rollup-plugin-bundle-size';
+import getBabelConfig from './babel.config';
 
 export const fileExtensions = ['.ts'];
 
+function createBabelConfig() {
+  // https://github.com/rollup/plugins/tree/master/packages/babel#running-babel-on-the-generated-code
+  return babel({
+    babelHelpers: 'bundled',
+    comments: false,
+    extensions: fileExtensions, // https://github.com/rollup/rollup-plugin-babel/issues/255
+    ...getBabelConfig(),
+  });
+}
+
 export function createEsbuildConfig(config) {
   config = {
     target: 'es2015',
@@ -102,14 +113,7 @@ export function createCommonJSConfig(config) {
     external: config.external,
     plugins: [
       nodeResolve({ extensions: fileExtensions }),
-      // https://github.com/rollup/plugins/tree/master/packages/babel#running-babel-on-the-generated-code
-      babel({
-        babelHelpers: 'bundled',
-        comments: false,
-        exclude: ['node_modules/**'],
-        presets: ['@babel/preset-env'],
-        extensions: fileExtensions, // https://github.com/rollup/rollup-plugin-babel/issues/255
-      }),
+      createBabelConfig(),
       typescript(), // Only so that Rollup can work with typescript (Not for generating any 'declaration' files)
       bundleSize(),
       ...config.additionalPlugins,

yarn.lock

@@ -1996,6 +1996,15 @@
     "@babel/helper-plugin-utils" "^7.13.0"
     "@babel/plugin-syntax-typescript" "^7.12.13"
 
+"@babel/plugin-transform-typescript@^7.15.0":
+  version "7.15.4"
+  resolved "https://registry.yarnpkg.com/@babel/plugin-transform-typescript/-/plugin-transform-typescript-7.15.4.tgz#db7a062dcf8be5fc096bc0eeb40a13fbfa1fa251"
+  integrity sha512-sM1/FEjwYjXvMwu1PJStH11kJ154zd/lpY56NQJ5qH2D0mabMv1CAy/kdvS9RP4Xgfj9fBBA3JiSLdDHgXdzOA==
+  dependencies:
+    "@babel/helper-create-class-features-plugin" "^7.15.4"
+    "@babel/helper-plugin-utils" "^7.14.5"
+    "@babel/plugin-syntax-typescript" "^7.14.5"
+
 "@babel/plugin-transform-unicode-escapes@^7.12.1", "@babel/plugin-transform-unicode-escapes@^7.14.5":
   version "7.14.5"
   resolved "https://registry.yarnpkg.com/@babel/plugin-transform-unicode-escapes/-/plugin-transform-unicode-escapes-7.14.5.tgz#9d4bd2a681e3c5d7acf4f57fa9e51175d91d0c6b"
@@ -2397,6 +2406,15 @@
     "@babel/helper-validator-option" "^7.12.17"
     "@babel/plugin-transform-typescript" "^7.13.0"
 
+"@babel/preset-typescript@^7.15.0":
+  version "7.15.0"
+  resolved "https://registry.yarnpkg.com/@babel/preset-typescript/-/preset-typescript-7.15.0.tgz#e8fca638a1a0f64f14e1119f7fe4500277840945"
+  integrity sha512-lt0Y/8V3y06Wq/8H/u0WakrqciZ7Fz7mwPDHWUJAXlABL5hiUG42BNlRXiELNjeWjO5rWmnNKlx+yzJvxezHow==
+  dependencies:
+    "@babel/helper-plugin-utils" "^7.14.5"
+    "@babel/helper-validator-option" "^7.14.5"
+    "@babel/plugin-transform-typescript" "^7.15.0"
+
 "@babel/register@^7.0.0":
   version "7.13.16"
   resolved "https://registry.yarnpkg.com/@babel/register/-/register-7.13.16.tgz#ae3ab0b55c8ec28763877383c454f01521d9a53d"