diff --git a/.changeset/nine-geese-rest.md b/.changeset/nine-geese-rest.md
new file mode 100644
index 0000000000..da91c6234b
--- /dev/null
+++ b/.changeset/nine-geese-rest.md
@@ -0,0 +1,6 @@
+---
+'@backstage/cli': patch
+---
+
+Changed Rollup configuration for TypeScript definition plugin to ignore `css`,
+`scss`, `sass`, `svg`, `eot`, `woff`, `woff2` and `ttf` files.
diff --git a/packages/cli/src/lib/builder/config.ts b/packages/cli/src/lib/builder/config.ts
index fe91cedbb0..1cfaf15bfc 100644
--- a/packages/cli/src/lib/builder/config.ts
+++ b/packages/cli/src/lib/builder/config.ts
@@ -154,6 +154,16 @@ export async function makeRollupConfigs(
         file: resolvePath(distDir, 'index.d.ts'),
         format: 'es',
       },
+      external: [
+        /\.css$/,
+        /\.scss$/,
+        /\.sass$/,
+        /\.svg$/,
+        /\.eot$/,
+        /\.woff$/,
+        /\.woff2$/,
+        /\.ttf$/,
+      ],
       onwarn,
       plugins: [dts()],
     });