fix(linter): do not allow relative import of non-project files

packages/eslint-plugin/src/rules/enforce-module-boundaries.spec.ts

@@ -1168,6 +1168,42 @@ Violation detected in:
       expect(failures[0].message).toEqual(message);
       expect(failures[1].message).toEqual(message);
     });
+
+    it('should error when relatively importing the external resources', () => {
+      const failures = runRule(
+        {},
+        `${process.cwd()}/proj/libs/mylib/src/main.ts`,
+        `
+          import '../../../non-project';
+          import('/tmp/some/path/to/file');
+        `,
+        {
+          nodes: {
+            mylibName: {
+              name: 'mylibName',
+              type: 'lib',
+              data: {
+                root: 'libs/mylib',
+                tags: [],
+                implicitDependencies: [],
+                targets: {},
+              },
+            },
+          },
+          dependencies: {},
+        },
+        {
+          mylibName: [createFile(`libs/mylib/src/main.ts`)],
+        }
+      );
+      expect(failures.length).toEqual(2);
+      expect(failures[0].message).toEqual(
+        'External resources cannot be imported using a relative or absolute path'
+      );
+      expect(failures[1].message).toEqual(
+        'External resources cannot be imported using a relative or absolute path'
+      );
+    });
   });
 
   it('should error on absolute imports into libraries without using the npm scope', () => {

packages/eslint-plugin/src/rules/enforce-module-boundaries.ts

@@ -58,6 +58,7 @@ type Options = [
 ];
 export type MessageIds =
   | 'noRelativeOrAbsoluteImportsAcrossLibraries'
+  | 'noRelativeOrAbsoluteExternals'
   | 'noSelfCircularDependencies'
   | 'noCircularDependencies'
   | 'noImportsOfApps'
@@ -159,6 +160,7 @@ export default ESLintUtils.RuleCreator(() => ``)<Options, MessageIds>({
     ],
     messages: {
       noRelativeOrAbsoluteImportsAcrossLibraries: `Projects cannot be imported by a relative or absolute path, and must begin with a npm scope`,
+      noRelativeOrAbsoluteExternals: `External resources cannot be imported using a relative or absolute path`,
       noCircularDependencies: `Circular dependency between "{{sourceProjectName}}" and "{{targetProjectName}}" detected: {{path}}\n\nCircular file chain:\n{{filePaths}}`,
       noSelfCircularDependencies: `Projects should use relative imports to import from other files within the same project. Use "./path/to/file" instead of import from "{{imp}}"`,
       noImportsOfApps: 'Imports of apps are forbidden',
@@ -345,8 +347,15 @@ export default ESLintUtils.RuleCreator(() => ``)<Options, MessageIds>({
           imp
         );
 
-      // If target is not part of an nx workspace, return.
       if (!targetProject) {
+        // non-project imports cannot use relative or absolute paths
+        if (isRelativePath(imp) || imp.startsWith('/')) {
+          context.report({
+            node,
+            messageId: 'noRelativeOrAbsoluteExternals',
+          });
+        }
+        // If target is not found (including node internals) we bail early
         return;
       }