fix(arborist): correctly load overrides on workspace edges, closes #4205

Author: nlf

workspaces/arborist/lib/arborist/load-actual.js

@@ -212,7 +212,8 @@ module.exports = cls => class ActualLoader extends cls {
     const promises = []
     for (const path of tree.workspaces.values()) {
       if (!this[_cache].has(path)) {
-        const p = this[_loadFSNode]({ path, root: this[_actualTree] })
+        // workspace overrides use the root overrides
+        const p = this[_loadFSNode]({ path, root: this[_actualTree], useRootOverrides: true })
           .then(node => this[_loadFSTree](node))
         promises.push(p)
       }
@@ -240,7 +241,7 @@ module.exports = cls => class ActualLoader extends cls {
     this[_actualTree] = root
   }
 
-  [_loadFSNode] ({ path, parent, real, root, loadOverrides }) {
+  [_loadFSNode] ({ path, parent, real, root, loadOverrides, useRootOverrides }) {
     if (!real) {
       return realpath(path, this[_rpcache], this[_stcache])
         .then(
@@ -250,6 +251,7 @@ module.exports = cls => class ActualLoader extends cls {
             real,
             root,
             loadOverrides,
+            useRootOverrides,
           }),
           // if realpath fails, just provide a dummy error node
           error => new Node({
@@ -289,6 +291,9 @@ module.exports = cls => class ActualLoader extends cls {
           parent,
           root,
           loadOverrides,
+          ...(useRootOverrides && root.overrides
+            ? { overrides: root.overrides.getNodeRule({ name: pkg.name, version: pkg.version }) }
+            : {}),
         })
       })
       .then(node => {

workspaces/arborist/test/arborist/build-ideal-tree.js

@@ -3744,6 +3744,50 @@ t.test('overrides', t => {
     t.equal(bcEdge.to.version, '2.0.0', 'b->c is 2.0.0')
   })
 
+  t.test('overrides a workspace dependency', async (t) => {
+    generateNocks(t, {
+      bar: {
+        versions: ['1.0.0', '1.0.1', '2.0.0'],
+      },
+    })
+
+    const path = t.testdir({
+      'package.json': JSON.stringify({
+        name: 'root',
+        dependencies: {
+          foo: '1.0.1',
+        },
+        overrides: {
+          bar: '2.0.0',
+        },
+        workspaces: [
+          './workspaces/*',
+        ],
+      }),
+      workspaces: {
+        foo: {
+          'package.json': JSON.stringify({
+            name: 'foo',
+            version: '1.0.1',
+            dependencies: {
+              bar: '1.0.0',
+            },
+          }),
+        },
+      },
+    })
+
+    const tree = await buildIdeal(path)
+
+    const fooEdge = tree.edgesOut.get('foo')
+    t.equal(fooEdge.valid, true)
+
+    // fooEdge.to is a link, so we need to look at the target for edgesOut
+    const fooBarEdge = fooEdge.to.target.edgesOut.get('bar')
+    t.equal(fooBarEdge.valid, true)
+    t.equal(fooBarEdge.to.version, '2.0.0')
+  })
+
   t.end()
 })
 

workspaces/arborist/test/arborist/load-actual.js

@@ -422,3 +422,33 @@ t.test('load global space with link deps', async t => {
     },
   })
 })
+
+t.test('loading a workspace maintains overrides', async t => {
+  const path = t.testdir({
+    'package.json': JSON.stringify({
+      name: 'root',
+      version: '1.0.0',
+      dependencies: {
+        foo: '1.0.0',
+      },
+      overrides: {
+        bar: '2.0.0',
+      },
+      workspaces: ['./foo'],
+    }),
+    foo: {
+      'package.json': JSON.stringify({
+        name: 'foo',
+        version: '1.0.0',
+        dependencies: {
+          bar: '1.0.0',
+        },
+      }),
+    },
+  })
+
+  const tree = await loadActual(path)
+
+  const fooEdge = tree.edgesOut.get('foo')
+  t.equal(tree.overrides, fooEdge.overrides, 'foo edge got the correct overrides')
+})