fix: properly update lockfile v2

__fixtures__/lockfile-leaf-v2/lerna.json

@@ -0,0 +1,3 @@
+{
+  "version": "1.0.0"
+}

__fixtures__/lockfile-leaf-v2/package.json

@@ -0,0 +1,5 @@
+{
+  "name": "leaf-lockfile",
+  "version": "0.0.0-lerna",
+  "private": true
+}

__fixtures__/lockfile-leaf-v2/packages/package-1/package.json

@@ -0,0 +1,7 @@
+{
+  "name": "package-1",
+  "version": "1.0.0",
+  "dependencies": {
+    "tiny-tarball": "^1.0.0"
+  }
+}

commands/version/__tests__/update-lockfile-version.test.js

@@ -12,7 +12,7 @@ const initFixture = require("@lerna-test/init-fixture")(__dirname);
 
 const { updateLockfileVersion } = require("../lib/update-lockfile-version");
 
-test("updateLockfileVersion", async () => {
+test("updateLockfileVersion with lockfile v1", async () => {
   const cwd = await initFixture("lockfile-leaf");
   const [pkg] = await getPackages(cwd);
 
@@ -25,6 +25,21 @@ test("updateLockfileVersion", async () => {
   expect(fs.readJSONSync(returnedLockfilePath)).toHaveProperty("version", "2.0.0");
 });
 
+test("updateLockfileVersion with lockfile v2", async () => {
+  const cwd = await initFixture("lockfile-leaf-v2");
+  const [pkg] = await getPackages(cwd);
+
+  pkg.version = "2.0.0";
+
+  const returnedLockfilePath = await updateLockfileVersion(pkg);
+
+  expect(returnedLockfilePath).toBe(path.join(pkg.location, "package-lock.json"));
+  expect(Array.from(loadJsonFile.registry.keys())).toStrictEqual(["/packages/package-1"]);
+  const updatedLockfile = fs.readJSONSync(returnedLockfilePath);
+  expect(updatedLockfile).toHaveProperty("version", "2.0.0");
+  expect(updatedLockfile).toHaveProperty(["packages", "", "version"], "2.0.0");
+});
+
 test("updateLockfileVersion without sibling lockfile", async () => {
   const cwd = await initFixture("lifecycle", false);
   const [pkg] = await getPackages(cwd);

commands/version/lib/update-lockfile-version.js

@@ -16,6 +16,10 @@ function updateLockfileVersion(pkg) {
     if (obj) {
       obj.version = pkg.version;
 
+      if (obj.packages && obj.packages[""]) {
+        obj.packages[""].version = pkg.version;
+      }
+
       return writeJsonFile(lockfilePath, obj, {
         detectIndent: true,
         indent: 2,