diff --git a/common/web/lm-worker/src/test/test-runner/cases/worker.spec.mjs b/common/web/lm-worker/src/test/test-runner/cases/worker.spec.ts
similarity index 92%
rename from common/web/lm-worker/src/test/test-runner/cases/worker.spec.mjs
rename to common/web/lm-worker/src/test/test-runner/cases/worker.spec.ts
index 699b28f177..c758549dfd 100644
--- a/common/web/lm-worker/src/test/test-runner/cases/worker.spec.mjs
+++ b/common/web/lm-worker/src/test/test-runner/cases/worker.spec.ts
@@ -9,9 +9,6 @@ describe('LMLayerWorker', function () {
 
   describe('LMLayerWorkerCode', function() {
     it('should exist!', function() {
-      // assert.isFunction(LMLayerWorkerCode,
-      //   'Could not find LMLayerWorkerCode! Does embedded_worker.js exist?'
-      // );
       assert.isString(LMLayerWorkerCode);
     });
   });
diff --git a/common/web/lm-worker/src/test/test-runner/web-test-runner.config.mjs b/common/web/lm-worker/src/test/test-runner/web-test-runner.config.mjs
index 1d3fb003e7..5ad4f43adf 100644
--- a/common/web/lm-worker/src/test/test-runner/web-test-runner.config.mjs
+++ b/common/web/lm-worker/src/test/test-runner/web-test-runner.config.mjs
@@ -1,6 +1,7 @@
 // @ts-check
 import { devices, playwrightLauncher } from '@web/test-runner-playwright';
 import { defaultReporter, summaryReporter } from '@web/test-runner';
+import { esbuildPlugin } from '@web/dev-server-esbuild';
 import named from '@keymanapp/common-test-resources/test-runner-rename-browser.mjs'
 import { fileURLToPath } from 'url';
 import { dirname, resolve } from 'path';
@@ -26,7 +27,10 @@ export default {
   concurrency: 10,
   nodeResolve: true,
   files: [
-    '**/*.spec.mjs'
+    '**/*.spec.ts'
+  ],
+  plugins: [
+    esbuildPlugin({ts: true, target: 'auto'})
   ],
   reporters: [
     summaryReporter({}), /* local-dev mocha-style */