fix(core): read project name from package json if not set in project json (#26386)

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## Current Behavior
If `project.json` exists without a name, we infer one based on the root
path. This can be confusing when there exists a `package.json` alongside
it that contains a name which doesn't match our inferred name.

## Expected Behavior
If `project.json` and `package.json` both exist, the name from
`package.json` will be used if `project.json` contains no name.

## Related Issue(s)
<!-- Please link the issue being fixed so it gets closed when this is
merged. -->

Fixes #26347

packages/nx/migrations.json

@@ -83,6 +83,12 @@
       "version": "19.2.2-beta.0",
       "description": "Updates the nx wrapper.",
       "implementation": "./src/migrations/update-17-3-0/update-nxw"
+    },
+    "19-2-4-set-project-name": {
+      "version": "19.2.4-beta.0",
+      "description": "Set project name in nx.json explicitly",
+      "implementation": "./src/migrations/update-19-2-4/set-project-name",
+      "x-repair-skip": true
     }
   }
 }

packages/nx/src/migrations/update-19-2-4/set-project-name.spec.ts

@@ -0,0 +1,100 @@
+import { createTreeWithEmptyWorkspace } from '../../generators/testing-utils/create-tree-with-empty-workspace';
+import { readJson } from '../../generators/utils/json';
+import migrate from './set-project-name';
+
+describe('set project name', () => {
+  it('should not update packageJson projects', async () => {
+    const tree = createTreeWithEmptyWorkspace();
+    tree.write(
+      'libs/proj/package.json',
+      JSON.stringify({
+        name: '@scoped/package',
+      })
+    );
+    await migrate(tree);
+    expect(tree.exists('libs/proj/project.json')).toBe(false);
+  });
+
+  it('should not update projectJson if name specified', async () => {
+    const tree = createTreeWithEmptyWorkspace();
+    tree.write(
+      'libs/proj/project.json',
+      JSON.stringify({
+        name: 'foo',
+      })
+    );
+    await migrate(tree);
+    const project = readJson(tree, 'libs/proj/project.json');
+    expect(project.name).toBe('foo');
+  });
+
+  it('should not update projectJson if name is not specified but no sibling package json', async () => {
+    const tree = createTreeWithEmptyWorkspace();
+    tree.write('libs/proj/project.json', JSON.stringify({}));
+    await migrate(tree);
+    const project = readJson(tree, 'libs/proj/project.json');
+    expect(project.name).not.toBeDefined();
+  });
+
+  it('should not update projectJson if name is identical to package name', async () => {
+    const tree = createTreeWithEmptyWorkspace();
+    tree.write(
+      'libs/proj/package.json',
+      JSON.stringify({
+        name: 'proj',
+      })
+    );
+    tree.write('libs/proj/project.json', JSON.stringify({}));
+    await migrate(tree);
+    const project = readJson(tree, 'libs/proj/project.json');
+    expect(project.name).not.toBeDefined();
+  });
+
+  it('should not update projectJson if name is identical to name in nx field', async () => {
+    const tree = createTreeWithEmptyWorkspace();
+    tree.write(
+      'libs/proj/package.json',
+      JSON.stringify({
+        name: '@scoped/proj',
+        nx: {
+          name: 'proj',
+        },
+      })
+    );
+    tree.write('libs/proj/project.json', JSON.stringify({}));
+    await migrate(tree);
+    const project = readJson(tree, 'libs/proj/project.json');
+    expect(project.name).not.toBeDefined();
+  });
+
+  it('should update projectJson if name is not specified and package name is different', async () => {
+    const tree = createTreeWithEmptyWorkspace();
+    tree.write(
+      'libs/proj/package.json',
+      JSON.stringify({
+        name: '@scoped/proj',
+      })
+    );
+    tree.write('libs/proj/project.json', JSON.stringify({}));
+    await migrate(tree);
+    const project = readJson(tree, 'libs/proj/project.json');
+    expect(project.name).toBe('proj');
+  });
+
+  it('should update projectJson if name is not specified and name in nx field is different', async () => {
+    const tree = createTreeWithEmptyWorkspace();
+    tree.write(
+      'libs/foo/package.json',
+      JSON.stringify({
+        name: '@scoped/proj',
+        nx: {
+          name: 'proj',
+        },
+      })
+    );
+    tree.write('libs/foo/project.json', JSON.stringify({}));
+    await migrate(tree);
+    const project = readJson(tree, 'libs/foo/project.json');
+    expect(project.name).toBe('foo');
+  });
+});

packages/nx/src/migrations/update-19-2-4/set-project-name.ts

@@ -0,0 +1,43 @@
+import { toProjectName } from '../../config/to-project-name';
+import { ProjectConfiguration } from '../../config/workspace-json-project-json';
+import { Tree } from '../../generators/tree';
+import { formatChangedFilesWithPrettierIfAvailable } from '../../generators/internal-utils/format-changed-files-with-prettier-if-available';
+import { readJson, writeJson } from '../../generators/utils/json';
+import { getProjects } from '../../generators/utils/project-configuration';
+import type { PackageJson } from '../../utils/package-json';
+
+export default async function setProjectName(tree: Tree) {
+  // We are explicitly looking for project.json files here, so getProjects is fine.
+  const projects = getProjects(tree);
+
+  for (const { root } of projects.values()) {
+    const projectJsonPath = `${root}/project.json`;
+    const packageJsonPath = `${root}/package.json`;
+
+    // If either of these files doesn't exist, theres no behavioral difference
+    if (!tree.exists(projectJsonPath) || !tree.exists(packageJsonPath)) {
+      continue;
+    }
+
+    const projectJson: ProjectConfiguration = readJson(tree, projectJsonPath);
+
+    // In Nx 19.1+, the way the project name is inferred is different.
+    // For existing projects, if the name is not set, we can inline it
+    // based on the existing logic. This makes sure folks aren't caught
+    // off guard by the new behavior.
+    if (!projectJson.name) {
+      const siblingPackageJson = readJson<PackageJson>(tree, packageJsonPath);
+
+      const newName = siblingPackageJson.nx?.name ?? siblingPackageJson.name;
+
+      const oldName = toProjectName(projectJsonPath);
+
+      if (newName && oldName !== newName) {
+        projectJson.name = oldName;
+        writeJson(tree, projectJsonPath, projectJson);
+      }
+    }
+  }
+
+  await formatChangedFilesWithPrettierIfAvailable(tree);
+}

packages/nx/src/plugins/project-json/build-nodes/project-json.ts

@@ -4,6 +4,7 @@ import { ProjectConfiguration } from '../../../config/workspace-json-project-jso
 import { toProjectName } from '../../../config/to-project-name';
 import { readJsonFile } from '../../../utils/fileutils';
 import { NxPluginV2 } from '../../../project-graph/plugins';
+import { PackageJson } from '../../../utils/package-json';
 
 export const ProjectJsonProjectsPlugin: NxPluginV2 = {
   name: 'nx/core/project-json',
@@ -15,6 +16,7 @@ export const ProjectJsonProjectsPlugin: NxPluginV2 = {
       );
 
       const project = buildProjectFromProjectJson(json, file);
+
       return {
         projects: {
           [project.root]: project,
@@ -30,9 +32,21 @@ export function buildProjectFromProjectJson(
   json: Partial<ProjectConfiguration>,
   path: string
 ): ProjectConfiguration {
+  const packageJsonPath = join(dirname(path), 'package.json');
+  const { name, root, ...rest } = json;
   return {
-    name: toProjectName(path),
-    root: dirname(path),
-    ...json,
+    name:
+      name ?? readNameFromPackageJson(packageJsonPath) ?? toProjectName(path),
+    root: root ?? dirname(path),
+    ...rest,
   };
 }
+
+export function readNameFromPackageJson(path: string): string {
+  try {
+    const json = readJsonFile<PackageJson>(path);
+    return json.nx?.name ?? json.name;
+  } catch {
+    return undefined;
+  }
+}

packages/nx/src/utils/package-json.ts

@@ -14,6 +14,7 @@ import {
 } from './package-manager';
 
 export interface NxProjectPackageJsonConfiguration {
+  name?: string;
   implicitDependencies?: string[];
   tags?: string[];
   namedInputs?: { [inputName: string]: (string | InputDefinition)[] };