feat(core): add a metadata plugin for project file sizes

packages/nx/src/plugins/project-sizes/index.ts

@@ -0,0 +1,38 @@
+import {
+  CreateMetadata,
+  CreateMetadataContext,
+  ProjectsMetadata,
+} from '../../project-graph/plugins';
+import { ProjectGraph } from '../../config/project-graph';
+import { getFileMap } from '../../project-graph/build-project-graph';
+
+export const name = 'nx/core/project-sizes';
+
+export const createMetadata: CreateMetadata = (
+  graph: ProjectGraph,
+  options: unknown,
+  context: CreateMetadataContext
+): ProjectsMetadata => {
+  // TODO: should this be a call to the daemon so that we can work in isolated context?
+  const {
+    fileMap: { projectFileMap },
+  } = getFileMap();
+
+  const projectsMetadata: ProjectsMetadata = {};
+  for (const [projectId, project] of Object.entries(graph.nodes)) {
+    let totalSize = 0;
+    let totalFiles = projectFileMap[projectId].length;
+    for (let i of projectFileMap[projectId]) {
+      totalSize += i.size ?? 0;
+    }
+
+    projectsMetadata[projectId] = {
+      metadata: {
+        totalSize,
+        totalFiles,
+      } as any,
+    };
+  }
+
+  return projectsMetadata;
+};

packages/nx/src/project-graph/plugins/internal-api.ts

@@ -154,5 +154,6 @@ export async function getDefaultPlugins(root: string) {
       : []),
     join(__dirname, '../../plugins/package-json-workspaces'),
     join(__dirname, '../../plugins/project-json/build-nodes/project-json'),
+    join(__dirname, '../../plugins/project-sizes'),
   ];
 }

packages/nx/src/project-graph/plugins/utils.ts

@@ -19,7 +19,11 @@ import { AggregateCreateNodesError, CreateNodesError } from '../error-types';
 import { performance } from 'perf_hooks';
 
 export function isNxPluginV2(plugin: NxPlugin): plugin is NxPluginV2 {
-  return 'createNodes' in plugin || 'createDependencies' in plugin;
+  return (
+    'createNodes' in plugin ||
+    'createDependencies' in plugin ||
+    'createMetadata' in plugin
+  );
 }
 
 export function isNxPluginV1(