Rework build

.gitignore

@@ -1,3 +1,2 @@
 node_modules
-index.js
-index.d.ts
+/lib

Makefile

@@ -0,0 +1,11 @@
+.PHONY: build
+build:
+	@rm -rf lib
+	@env npx babel src --source-root src --out-dir lib --extensions .mjs --out-file-extension .js --ignore "src/**/test.ts" --quiet
+	@rsync --archive --prune-empty-dirs --exclude 'test.ts' --relative src/./ lib
+
+publish: build
+	@npm publish --access public
+
+publish-next: build
+	@npm publish --access public --tag next

babel.config.js

@@ -0,0 +1,10 @@
+module.exports = {
+  // presets: [["@babel/preset-env", { modules: "commonjs", loose: true }]],
+  plugins: [
+    [
+      "@babel/plugin-transform-modules-commonjs",
+      { importInterop: "node", loose: true, strict: true },
+    ],
+    ["babel-plugin-add-import-extension", { extension: "js" }],
+  ],
+};