1 files changed, 59 insertions, 0 deletions
diff --git a/devtools/client/debugger/test/mochitest/examples/preview.js b/devtools/client/debugger/test/mochitest/examples/preview.js
new file mode 100644
index 0000000000..25d8427fa5
--- /dev/null
+++ b/devtools/client/debugger/test/mochitest/examples/preview.js
@@ -0,0 +1,59 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
+
+function empties() {
+  const a = "";
+  const b = false;
+  const c = undefined;
+  const d = null;
+  debugger;
+}
+
+function smalls() {
+  const a = "...";
+  const b = true;
+  const c = 1;
+  const d = [];
+  const e = {};
+  debugger;
+}
+
+function objects() {
+  const obj = {
+    foo: 1,
+  };
+
+  const empty = Object.create(null);
+  const foo = obj?.foo;
+
+  debugger;
+}
+
+function largeArray() {
+  const bs = [];
+  for (let i = 0; i <= 100; i++) {
+    bs.push({ a: 2, b: { c: 3 } });
+  }
+  debugger;
+}
+
+function classPreview() {
+  class Foo {
+    x = 1;
+    #privateVar = 2;
+    static #privateStatic = { first: "a", second: "b" };
+    #privateMethod() {
+      return this.#privateVar;
+    }
+    breakFn() {
+      let i = this.x * this.#privateVar + Foo.#privateStatic;
+      if (#privateVar in this && this.#privateVar !== 0) {
+        i = i * 2;
+      }
+      debugger;
+    }
+  }
+  const foo = new Foo();
+  foo.breakFn();
+}