From bfd9912e1faa30a92472252b77878714e668a3d4 Mon Sep 17 00:00:00 2001
From: David Sherret <dsherret@users.noreply.github.com>
Date: Thu, 27 Oct 2022 08:12:40 -0400
Subject: fix(typescript): allow synthetic default imports when using
 `ModuleKind.ESNext` (#16438)

Closes #16437
---
 cli/tests/integration/check_tests.rs                             | 5 +++++
 cli/tests/testdata/check/export_equals_declaration_file/main.ts  | 6 ++++++
 .../testdata/check/export_equals_declaration_file/other.d.ts     | 9 +++++++++
 cli/tests/testdata/check/export_equals_declaration_file/other.js | 3 +++
 cli/tsc/00_typescript.js                                         | 2 +-
 5 files changed, 24 insertions(+), 1 deletion(-)
 create mode 100644 cli/tests/testdata/check/export_equals_declaration_file/main.ts
 create mode 100644 cli/tests/testdata/check/export_equals_declaration_file/other.d.ts
 create mode 100644 cli/tests/testdata/check/export_equals_declaration_file/other.js

(limited to 'cli')

diff --git a/cli/tests/integration/check_tests.rs b/cli/tests/integration/check_tests.rs
index f42cd4a7a..03a5c932c 100644
--- a/cli/tests/integration/check_tests.rs
+++ b/cli/tests/integration/check_tests.rs
@@ -57,6 +57,11 @@ itest!(check_npm_install_diagnostics {
   exit_code: 1,
 });
 
+itest!(check_export_equals_declaration_file {
+  args: "check --quiet check/export_equals_declaration_file/main.ts",
+  exit_code: 0,
+});
+
 #[test]
 fn cache_switching_config_then_no_config() {
   let deno_dir = util::new_deno_dir();
diff --git a/cli/tests/testdata/check/export_equals_declaration_file/main.ts b/cli/tests/testdata/check/export_equals_declaration_file/main.ts
new file mode 100644
index 000000000..e20a735d5
--- /dev/null
+++ b/cli/tests/testdata/check/export_equals_declaration_file/main.ts
@@ -0,0 +1,6 @@
+// @deno-types="./other.d.ts"
+import Test, { type Attributes } from "./other.js";
+
+const other: Attributes = {};
+console.log(Test());
+console.log(other);
diff --git a/cli/tests/testdata/check/export_equals_declaration_file/other.d.ts b/cli/tests/testdata/check/export_equals_declaration_file/other.d.ts
new file mode 100644
index 000000000..5e1274fa5
--- /dev/null
+++ b/cli/tests/testdata/check/export_equals_declaration_file/other.d.ts
@@ -0,0 +1,9 @@
+export = other;
+
+declare function other(): string;
+
+declare namespace other {
+  interface Attributes {
+    [attr: string]: string;
+  }
+}
diff --git a/cli/tests/testdata/check/export_equals_declaration_file/other.js b/cli/tests/testdata/check/export_equals_declaration_file/other.js
new file mode 100644
index 000000000..f66c03162
--- /dev/null
+++ b/cli/tests/testdata/check/export_equals_declaration_file/other.js
@@ -0,0 +1,3 @@
+export default function other() {
+  return "test";
+}
diff --git a/cli/tsc/00_typescript.js b/cli/tsc/00_typescript.js
index c39e70e24..01377c8b5 100644
--- a/cli/tsc/00_typescript.js
+++ b/cli/tsc/00_typescript.js
@@ -51163,7 +51163,7 @@ var ts;
             var usageMode = file && getUsageModeForExpression(usage);
             if (file && usageMode !== undefined) {
                 var result = isESMFormatImportImportingCommonjsFormatFile(usageMode, file.impliedNodeFormat);
-                if (usageMode === ts.ModuleKind.ESNext || result) {
+                if (result) {
                     return result;
                 }
                 // fallthrough on cjs usages so we imply defaults for interop'd imports, too
-- 
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