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node_modules/@weborigami/async-tree/test/operations/scope.test.js

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+import assert from "node:assert";
+import { describe, test } from "node:test";
+import { ObjectTree } from "../../src/internal.js";
+import scope from "../../src/operations/scope.js";
+
+describe("scope", () => {
+  test("gets the first defined value from the scope trees", async () => {
+    const outer = new ObjectTree({
+      a: 1,
+      b: 2,
+    });
+    const inner = new ObjectTree({
+      a: 3,
+    });
+    inner.parent = outer;
+    const innerScope = scope(inner);
+    assert.deepEqual([...(await innerScope.keys())], ["a", "b"]);
+    // Inner tree has precedence
+    assert.equal(await innerScope.get("a"), 3);
+    // If tree doesn't have value, finds value from parent
+    assert.equal(await innerScope.get("b"), 2);
+    assert.equal(await innerScope.get("c"), undefined);
+    assert.deepEqual(innerScope.trees, [inner, outer]);
+  });
+});