fix(typescript): allow synthetic default imports when using ModuleKind.ESNext (#16438)

Closes #16437

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();

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);

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;
+  }
+}

cli/tests/testdata/check/export_equals_declaration_file/other.js

@@ -0,0 +1,3 @@
+export default function other() {
+  return "test";
+}

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