diff --git a/packages/compiler-cli/src/ngtsc/shims/src/reference_tagger.ts b/packages/compiler-cli/src/ngtsc/shims/src/reference_tagger.ts
index 126bfb982c..ceecb0c514 100644
--- a/packages/compiler-cli/src/ngtsc/shims/src/reference_tagger.ts
+++ b/packages/compiler-cli/src/ngtsc/shims/src/reference_tagger.ts
@@ -9,6 +9,7 @@
 import * as ts from 'typescript';
 
 import {absoluteFrom, absoluteFromSourceFile} from '../../file_system';
+import {isNonDeclarationTsPath} from '../../util/src/typescript';
 
 import {isExtended as isExtendedSf, isShim, NgExtension, sfExtensionData} from './expando';
 import {makeShimFileName} from './util';
@@ -42,7 +43,8 @@ export class ShimReferenceTagger {
    * Tag `sf` with any needed references if it's not a shim itself.
    */
   tag(sf: ts.SourceFile): void {
-    if (!this.enabled || sf.isDeclarationFile || isShim(sf) || this.tagged.has(sf)) {
+    if (!this.enabled || sf.isDeclarationFile || isShim(sf) || this.tagged.has(sf) ||
+        !isNonDeclarationTsPath(sf.fileName)) {
       return;
     }
 
diff --git a/packages/compiler-cli/src/ngtsc/shims/test/reference_tagger_spec.ts b/packages/compiler-cli/src/ngtsc/shims/test/reference_tagger_spec.ts
index 0fae631048..72b96cf84a 100644
--- a/packages/compiler-cli/src/ngtsc/shims/test/reference_tagger_spec.ts
+++ b/packages/compiler-cli/src/ngtsc/shims/test/reference_tagger_spec.ts
@@ -40,6 +40,17 @@ runInEachFileSystem(() => {
       expectReferencedFiles(sf, []);
     });
 
+    it('should not tag .js files', () => {
+      const tagger = new ShimReferenceTagger(['test1', 'test2']);
+
+      const fileName = _('/file.js');
+      const sf = makeArbitrarySf(fileName);
+
+      expectReferencedFiles(sf, []);
+      tagger.tag(sf);
+      expectReferencedFiles(sf, []);
+    });
+
     it('should not tag shim files', () => {
       const tagger = new ShimReferenceTagger(['test1', 'test2']);
       const fileName = _('/file.ts');
diff --git a/packages/compiler-cli/test/ngtsc/env.ts b/packages/compiler-cli/test/ngtsc/env.ts
index f690b0abb3..8161a701e9 100644
--- a/packages/compiler-cli/test/ngtsc/env.ts
+++ b/packages/compiler-cli/test/ngtsc/env.ts
@@ -59,6 +59,7 @@ export class NgtscTestEnvironment {
         "outDir": "built",
         "rootDir": ".",
         "baseUrl": ".",
+        "allowJs": true,
         "declaration": true,
         "target": "es5",
         "newLine": "lf",
diff --git a/packages/compiler-cli/test/ngtsc/ngtsc_spec.ts b/packages/compiler-cli/test/ngtsc/ngtsc_spec.ts
index a3f83888aa..3aaed9fe49 100644
--- a/packages/compiler-cli/test/ngtsc/ngtsc_spec.ts
+++ b/packages/compiler-cli/test/ngtsc/ngtsc_spec.ts
@@ -3540,6 +3540,33 @@ runInEachFileSystem(os => {
         env.tsconfig({'generateNgFactoryShims': true});
       });
 
+      it('should not be generated for .js files', () => {
+        // This test verifies that the compiler does not attempt to generate shim files for non-TS
+        // input files (in this case, other.js).
+        env.write('test.ts', `
+          import {Component, NgModule} from '@angular/core';
+
+          @Component({
+            selector: 'test-cmp',
+            template: 'This is a template',
+          })
+          export class TestCmp {}
+
+          @NgModule({
+            declarations: [TestCmp],
+            exports: [TestCmp],
+          })
+          export class TestModule {}
+        `);
+        env.write('other.js', `
+          export class TestJs {}
+        `);
+
+        expect(env.driveDiagnostics()).toEqual([]);
+        env.assertExists('test.ngfactory.js');
+        env.assertDoesNotExist('other.ngfactory.js');
+      });
+
       it('should be able to depend on an existing factory shim', () => {
         // This test verifies that ngfactory files from the compilations of dependencies are
         // available to import in a fresh compilation. It is derived from a bug observed in g3 where