Clean dist to remove old files

package.json

@@ -10,6 +10,7 @@
     "test:unit": "jest --runInBand --verbose",
     "test:unit:watch": "jest --runInBand --watch --verbose",
     "build": "yarn build:esm && yarn build:cjs",
+    "build:clean": "node --experimental-modules scripts/clean-dist.mjs",
     "build:esm": "tsc --module es6 --target es2018 --outDir dist/esm",
     "build:cjs": "tsc --module commonjs --target es5 --outDir dist/cjs",
     "build:umd": "tsc --module umd --target es5 --outDir dist/umd",

scripts/clean-dist.mjs

@@ -0,0 +1,25 @@
+import {
+    existsSync,
+    readdirSync,
+    lstatSync,
+    unlinkSync,
+    rmdirSync,
+} from 'fs';
+import { join } from 'path';
+
+// eslint-disable-next-line @typescript-eslint/explicit-function-return-type
+const deleteFolderRecursive = (filePath) => {
+    if (existsSync(filePath)) {
+        readdirSync(filePath).forEach((file, _index) => {
+            const curPath = join(filePath, file);
+            if (lstatSync(curPath).isDirectory()) { // recurse
+                deleteFolderRecursive(curPath);
+            } else { // delete file
+                unlinkSync(curPath);
+            }
+        });
+        rmdirSync(filePath);
+    }
+};
+
+deleteFolderRecursive('./dist');