diff --git a/contract/src/objectTools.js b/contract/src/objectTools.js
new file mode 100644
index 00000000..b3f83ff5
--- /dev/null
+++ b/contract/src/objectTools.js
@@ -0,0 +1,22 @@
+// @ts-check
+const { entries, fromEntries } = Object;
+
+/** @type { <T extends Record<string, ERef<any>>>(obj: T) => Promise<{ [K in keyof T]: Awaited<T[K]>}> } */
+export const allValues = async obj => {
+  const es = await Promise.all(
+    entries(obj).map(async ([k, v]) => [k, await v]),
+  );
+  return fromEntries(es);
+};
+
+/** @type { <V, U, T extends Record<string, V>>(obj: T, f: (v: V) => U) => { [K in keyof T]: U }} */
+export const mapValues = (obj, f) =>
+  fromEntries(
+    entries(obj).map(([p, v]) => {
+      const entry = [p, f(v)];
+      return entry;
+    }),
+  );
+
+/** @type {<X, Y>(xs: X[], ys: Y[]) => [X, Y][]} */
+export const zip = (xs, ys) => xs.map((x, i) => [x, ys[i]]);