fix: handle yarn wokspaces.packages directive

src/main/ts/interface.ts

@@ -4,7 +4,7 @@ export type IPackageDeps = Record<string, string>
 
 export interface IPackageJson {
   name: string
-  workspaces?: string[]
+  workspaces?: string[] | { packages?: string[] }
   bolt?: {
     workspaces?: string[]
   }

src/main/ts/topo.ts

@@ -101,7 +101,7 @@ export const topo = async (
     pkgFilter,
     workspacesExtra,
     workspaces: [
-      ...(workspaces || (await getWorkspaces(root))),
+      ...(workspaces || (await extractWorkspaces(root))),
       ...workspacesExtra
     ]
   }
@@ -128,8 +128,10 @@ export const topo = async (
   }
 }
 
-export const getWorkspaces = async (root: IPackageEntry) =>
-  root.manifest.workspaces ||
+export const extractWorkspaces = async (root: IPackageEntry) =>
+  (Array.isArray(root.manifest.workspaces)
+    ? root.manifest.workspaces
+    : root.manifest.workspaces?.packages) ||
   root.manifest.bolt?.workspaces ||
   (await (async () => {
     try {

src/test/fixtures/yarn-monorepo/package.json

@@ -0,0 +1,8 @@
+{
+  "name": "root",
+  "workspaces": {
+    "packages": [
+      "packages/*"
+    ]
+  }
+}

src/test/fixtures/yarn-monorepo/packages/a/package.json

@@ -0,0 +1,4 @@
+{
+  "name": "a",
+  "private": true
+}

src/test/fixtures/yarn-monorepo/packages/b/no-package.txt

@@ -0,0 +1 @@
+no package.json

src/test/fixtures/yarn-monorepo/packages/c/package.json

@@ -0,0 +1,6 @@
+{
+  "name": "c",
+  "dependencies": {
+    "e": "*"
+  }
+}

src/test/fixtures/yarn-monorepo/packages/d/d/d/package.json

@@ -0,0 +1,3 @@
+{
+  "name": "d"
+}

src/test/fixtures/yarn-monorepo/packages/e/package.json

@@ -0,0 +1,3 @@
+{
+  "name": "e"
+}

src/test/ts/topo.ts

@@ -292,6 +292,12 @@ test('`topo` processes bolt monorepos', async () => {
   assert.equal(result.nodes, ['a', 'c', 'e'])
 })
 
+test('`topo` processes yarn monorepos with `workspaces.packages` directive', async () => {
+  const cwd = resolve(fixtures, 'yarn-monorepo')
+  const result = await topo({ cwd })
+  assert.equal(result.nodes, ['a', 'c', 'e'])
+})
+
 test('`topo` injects packages to workspaces via workspacesExtra', async () => {
   const cwd = resolve(fixtures, 'regular-monorepo')
   const workspaces = ['packages/*']