From ae26a9c7a22bf3311648a93a3171f087490c6e4d Mon Sep 17 00:00:00 2001
From: Ryan Dahl <ry@tinyclouds.org>
Date: Mon, 30 Sep 2019 12:38:23 -0400
Subject: [PATCH] Support top-level-await in TypeScript (#3024)

---
 cli/tests/integration_tests.rs | 5 +++++
 cli/tests/top_level_await.ts   | 3 +++
 js/compiler.ts                 | 3 +++
 3 files changed, 11 insertions(+)
 create mode 100644 cli/tests/top_level_await.ts

diff --git a/cli/tests/integration_tests.rs b/cli/tests/integration_tests.rs
index 99ab54a021..0e04071803 100644
--- a/cli/tests/integration_tests.rs
+++ b/cli/tests/integration_tests.rs
@@ -567,3 +567,8 @@ itest!(top_level_await {
   args: "--allow-read top_level_await.js",
   output: "top_level_await.out",
 });
+
+itest!(top_level_await_ts {
+  args: "--allow-read top_level_await.ts",
+  output: "top_level_await.out",
+});
diff --git a/cli/tests/top_level_await.ts b/cli/tests/top_level_await.ts
new file mode 100644
index 0000000000..65de253eae
--- /dev/null
+++ b/cli/tests/top_level_await.ts
@@ -0,0 +1,3 @@
+const buf: Uint8Array = await Deno.readFile("hello.txt");
+const n: number = await Deno.stdout.write(buf);
+console.log(`\n\nwrite ${n}`);
diff --git a/js/compiler.ts b/js/compiler.ts
index 1e1fe3dd39..56804ef9fb 100644
--- a/js/compiler.ts
+++ b/js/compiler.ts
@@ -539,6 +539,9 @@ window.compilerMain = function compilerMain(): void {
 
       diagnostics = ts.getPreEmitDiagnostics(program).filter(
         ({ code }): boolean => {
+          // TS1308: 'await' expression is only allowed within an async
+          // function.
+          if (code === 1308) return false;
           // TS2691: An import path cannot end with a '.ts' extension. Consider
           // importing 'bad-module' instead.
           if (code === 2691) return false;