diff --git a/src/dev/build/tasks/copy_source_task.ts b/src/dev/build/tasks/copy_source_task.ts
index a5039717760ae..da282f1940662 100644
--- a/src/dev/build/tasks/copy_source_task.ts
+++ b/src/dev/build/tasks/copy_source_task.ts
@@ -40,7 +40,7 @@ export const CopySource: Task = {
         '!src/dev/**',
         '!src/setup_node_env/babel_register/index.js',
         '!src/setup_node_env/babel_register/register.js',
-        '!**/public/**',
+        '!**/public/**/*.{js,ts,tsx,json}',
         'typings/**',
         'config/kibana.yml',
         'config/node.options',
diff --git a/x-pack/tasks/build.ts b/x-pack/tasks/build.ts
index a3b08a16f4b08..aaeea9d14e385 100644
--- a/x-pack/tasks/build.ts
+++ b/x-pack/tasks/build.ts
@@ -73,7 +73,7 @@ async function copySourceAndBabelify() {
           '**/*.{test,test.mocks,mock,mocks}.*',
           '**/*.d.ts',
           '**/node_modules/**',
-          '**/public/**',
+          '**/public/**/*.{js,ts,tsx,json}',
           '**/{__tests__,__mocks__,__snapshots__}/**',
           'plugins/canvas/shareable_runtime/test/**',
         ],