diff --git a/packages/typescript/internal/ts_project.bzl b/packages/typescript/internal/ts_project.bzl
index f6eb0a6cc6..9387a50ecf 100644
--- a/packages/typescript/internal/ts_project.bzl
+++ b/packages/typescript/internal/ts_project.bzl
@@ -549,15 +549,11 @@ def ts_project_macro(
             )
             extra_deps.append("_validate_%s_options" % name)
 
-    is_windows = select({
-        "@bazel_tools//src/conditions:host_windows": True,
-        "//conditions:default": False,
-    })
-    supports_workers = supports_workers and not is_windows
     if supports_workers:
-        worker_name = name + "_worker"
+        if not tsc:
+            tsc = _DEFAULT_TSC
         nodejs_binary(
-            name = worker_name,
+            name = "%s_worker" % name,
             data = [
                 tsconfig,
                 "//packages/typescript/internal/worker:copy_worker_js",
@@ -568,15 +564,16 @@ def ts_project_macro(
             entry_point = "//packages/typescript/internal/worker:worker_adapter",
             templated_args = [
                 "--nobazel_patch_module_resolver",
-                "$(rootpath {tsc})".format(tsc = tsc),
+                "$(rootpaths {})".format(tsc),
                 "--project",
-                "$(execpath {tsconfig})".format(tsconfig = tsconfig),
+                "$(execpath {})".format(tsconfig),
+                # FIXME: should take out_dir into account
                 "--outDir",
                 "$(RULEDIR)",
+                # FIXME: what about other settings like declaration_dir, root_dir, etc
                 "--watch",
             ],
         )
-        tsc = ":" + worker_name
 
     typings_out_dir = declaration_dir if declaration_dir else out_dir
     tsbuildinfo_path = ts_build_info_file if ts_build_info_file else name + ".tsbuildinfo"
@@ -600,6 +597,13 @@ def ts_project_macro(
         typings_outs = _out_paths(srcs, typings_out_dir, root_dir, ".d.ts") if declaration or composite else [],
         typing_maps_outs = _out_paths(srcs, typings_out_dir, root_dir, ".d.ts.map") if declaration_map else [],
         buildinfo_out = tsbuildinfo_path if composite or incremental else None,
-        tsc = tsc,
+        tsc = select({
+            "@bazel_tools//src/conditions:host_windows": tsc,
+            "//conditions:default": "%s_worker" % name if supports_workers else tsc,
+        }),
+        supports_workers = select({
+            "@bazel_tools//src/conditions:host_windows": False,
+            "//conditions:default": supports_workers,
+        }),
         **kwargs
     )
diff --git a/packages/typescript/test/ts_project/worker/BUILD.bazel b/packages/typescript/test/ts_project/worker/BUILD.bazel
index d88f89fa68..02afbe01ef 100644
--- a/packages/typescript/test/ts_project/worker/BUILD.bazel
+++ b/packages/typescript/test/ts_project/worker/BUILD.bazel
@@ -1,6 +1,10 @@
 load("//packages/typescript:index.bzl", "ts_project")
 
 ts_project(
-    declaration = True,
     supports_workers = True,
+    tsconfig = {
+        "compilerOptions": {
+            "declaration": True,
+        },
+    },
 )
diff --git a/packages/typescript/test/ts_project/worker/big.ts b/packages/typescript/test/ts_project/worker/big.ts
index c47d1b0914..90967f4441 100644
--- a/packages/typescript/test/ts_project/worker/big.ts
+++ b/packages/typescript/test/ts_project/worker/big.ts
@@ -1,3 +1,3 @@
 // TODO: make it big enough to slow down tsc
 
-export const a: number = 45;
+export const a: number = 47;
diff --git a/packages/typescript/test/ts_project/worker/tsconfig.json b/packages/typescript/test/ts_project/worker/tsconfig.json
deleted file mode 100644
index 1e6e3b3652..0000000000
--- a/packages/typescript/test/ts_project/worker/tsconfig.json
+++ /dev/null
@@ -1,6 +0,0 @@
-{
-    "compilerOptions": {
-        "types": [],
-        "declaration": true
-    }
-}
\ No newline at end of file
diff --git a/packages/typescript/test/ts_project/worker/worker_adapter.js b/packages/typescript/test/ts_project/worker/worker_adapter.js
deleted file mode 100644
index 1eae15672f..0000000000
--- a/packages/typescript/test/ts_project/worker/worker_adapter.js
+++ /dev/null
@@ -1,40 +0,0 @@
-const child_process = require('child_process');
-
-const worker = require('./worker');
-
-const workerArg = process.argv.indexOf('--persistent_worker')
-if (workerArg > 0) {
-  process.argv.splice(workerArg, 1)
-
-  if (process.platform !== 'linux' && process.platform !== 'darwin') {
-    throw new Error('Worker mode is only supported on unix type systems.');
-  }
-
-  worker.runWorkerLoop(awaitOneBuild);
-}
-
-const [tscBin, ...tscArgs] = process.argv.slice(2);
-
-const child = child_process.spawn(
-    tscBin,
-    tscArgs,
-    {stdio: 'pipe'},
-);
-
-function awaitOneBuild() {
-  child.kill('SIGCONT')
-
-  return new Promise((res) => {
-    function awaitBuild(s) {
-      if (s.includes('Watching for file changes.')) {
-        child.kill('SIGSTOP')
-
-        const success = s.includes('Found 0 errors.');
-        res(success);
-
-        child.stdout.removeListener('data', awaitBuild);
-      }
-    };
-    child.stdout.on('data', awaitBuild);
-  });
-}
\ No newline at end of file