diff --git a/docs/generated/devkit/ProjectGraphBuilder.md b/docs/generated/devkit/ProjectGraphBuilder.md
index 66a11e556fb30..4e8c8b1b33263 100644
--- a/docs/generated/devkit/ProjectGraphBuilder.md
+++ b/docs/generated/devkit/ProjectGraphBuilder.md
@@ -53,13 +53,13 @@ The ProjectGraphProcessor has been deprecated. Use a [CreateNodes](../../devkit/
 
 ### fileMap
 
-• `Private` `Optional` `Readonly` **fileMap**: [`ProjectFileMap`](../../devkit/documents/ProjectFileMap)
+• `Private` `Readonly` **fileMap**: [`ProjectFileMap`](../../devkit/documents/ProjectFileMap)
 
 ---
 
 ### graph
 
-• `Optional` `Readonly` **graph**: [`ProjectGraph`](../../devkit/documents/ProjectGraph)
+• `Readonly` **graph**: [`ProjectGraph`](../../devkit/documents/ProjectGraph)
 
 ---
 
diff --git a/packages/nx/src/project-graph/project-graph-builder.ts b/packages/nx/src/project-graph/project-graph-builder.ts
index 3938f0747076c..e5b7ba75cefbb 100644
--- a/packages/nx/src/project-graph/project-graph-builder.ts
+++ b/packages/nx/src/project-graph/project-graph-builder.ts
@@ -164,7 +164,7 @@ export class ProjectGraphBuilder {
     ) {
       throw new Error(`Target project does not exist: ${targetProjectName}`);
     }
-    // this._graph.dependencies[sourceProjectName] = this._graph.dependencies[
+    // this.graph.dependencies[sourceProjectName] = this.graph.dependencies[
     //   sourceProjectName
     // ].filter((d) => d.target !== targetProjectName);
     if (!this.removedEdges[sourceProjectName]) {
@@ -323,7 +323,7 @@ export class ProjectGraphBuilder {
     sourceProject: string
   ): Map<string, Set<DependencyType | string>> {
     const fileDeps = new Map<string, Set<DependencyType | string>>();
-    const files = this.fileMap?.[sourceProject] || [];
+    const files = this.fileMap[sourceProject] || [];
     if (!files) {
       return fileDeps;
     }