common: add depthOf() function

.changeset/tall-tips-shake.md

@@ -0,0 +1,5 @@
+---
+"@fleet-sdk/common": minor
+---
+
+Add `depthOf()` function.

packages/common/src/utils/array.spec.ts

@@ -4,6 +4,7 @@ import {
   areEqualBy,
   at,
   chunk,
+  depthOf,
   endsWith,
   first,
   hasDuplicates,
@@ -397,3 +398,18 @@ describe("uniqBy()", () => {
     ).to.be.true;
   });
 });
+
+describe("depthOf()", () => {
+  it("Should count depth of arrays", () => {
+    expect(depthOf([])).to.be.equal(1);
+    expect(depthOf([[]])).to.be.equal(2);
+    expect(depthOf([[[], []]])).to.be.equal(3);
+    expect(depthOf([[[[], [], []]]])).to.be.equal(4);
+    expect(depthOf([[[[], [[[]]]]]])).to.be.equal(6);
+
+    expect(depthOf({})).to.be.equal(0);
+    expect(depthOf(1)).to.be.equal(0);
+    expect(depthOf(undefined)).to.be.equal(0);
+    expect(depthOf(null)).to.be.equal(0);
+  });
+});

packages/common/src/utils/array.ts

@@ -190,3 +190,7 @@ export function uniqBy<T>(
       .values()
   );
 }
+
+export function depthOf(array: unknown | unknown[]): number {
+  return Array.isArray(array) ? 1 + Math.max(0, ...array.map(depthOf)) : 0;
+}