build(): Refactor Gulpfile to TS

tools/gulp/tasks/clean.ts

@@ -0,0 +1,33 @@
+import { task, src, series } from 'gulp';
+import { source } from '../config';
+import * as clean from 'gulp-clean';
+import * as deleteEmpty from 'delete-empty';
+
+/**
+ * Cleans the build output assets from the packages folders
+ */
+function cleanOutput() {
+  return src(
+    [
+      `${source}/**/*.js`,
+      `${source}/**/*.d.ts`,
+      `${source}/**/*.js.map`,
+      `${source}/**/*.d.ts.map`,
+    ],
+    {
+      read: false,
+    },
+  ).pipe(clean());
+}
+
+/**
+ * Cleans empty dirs
+ */
+function cleanDirs(done: () => void) {
+  deleteEmpty.sync(`${source}/`);
+  done();
+}
+
+task('clean:output', cleanOutput);
+task('clean:dirs', cleanDirs);
+task('clean:bundle', series('clean:output', 'clean:dirs'));