From 7198ba04b8b8715f9e1886dcecb39bc783157795 Mon Sep 17 00:00:00 2001
From: Divyansh Singh <40380293+brc-dd@users.noreply.github.com>
Date: Sat, 4 May 2024 18:58:09 +0530
Subject: [PATCH] fix: dont break transform when there is no space between
 function and generic parameter (#305)

---
 src/transform/preprocess.ts                            |  3 ++-
 .../unnamed-default-export-without-space/expected.d.ts | 10 ++++++++++
 .../unnamed-default-export-without-space/index.d.ts    |  9 +++++++++
 3 files changed, 21 insertions(+), 1 deletion(-)
 create mode 100644 tests/testcases/unnamed-default-export-without-space/expected.d.ts
 create mode 100644 tests/testcases/unnamed-default-export-without-space/index.d.ts

diff --git a/src/transform/preprocess.ts b/src/transform/preprocess.ts
index 62853c68..14e590b4 100644
--- a/src/transform/preprocess.ts
+++ b/src/transform/preprocess.ts
@@ -189,7 +189,8 @@ export function preProcess({ sourceFile }: PreProcessInput): PreProcessOutput {
         nextToken.kind >= ts.SyntaxKind.FirstPunctuation && nextToken.kind <= ts.SyntaxKind.LastPunctuation;
 
       if (isPunctuation) {
-        code.appendLeft(nextToken.getStart(), defaultExport);
+        const addSpace = code.slice(token.getEnd(), nextToken.getStart()) != " ";
+        code.appendLeft(nextToken.getStart(), `${addSpace ? " " : ""}${defaultExport}`);
       } else {
         code.appendRight(token.getEnd(), ` ${defaultExport}`);
       }
diff --git a/tests/testcases/unnamed-default-export-without-space/expected.d.ts b/tests/testcases/unnamed-default-export-without-space/expected.d.ts
new file mode 100644
index 00000000..4d55ac92
--- /dev/null
+++ b/tests/testcases/unnamed-default-export-without-space/expected.d.ts
@@ -0,0 +1,10 @@
+/**
+ * @description @TODO
+ */
+declare function export_default<T extends object>(
+  object: T,
+  initializationObject: {
+    [x in keyof T]: () => Promise<T[x]>;
+  },
+): Promise<void>;
+export { export_default as default };
diff --git a/tests/testcases/unnamed-default-export-without-space/index.d.ts b/tests/testcases/unnamed-default-export-without-space/index.d.ts
new file mode 100644
index 00000000..dfd9c91c
--- /dev/null
+++ b/tests/testcases/unnamed-default-export-without-space/index.d.ts
@@ -0,0 +1,9 @@
+/**
+ * @description @TODO
+ */
+export default function<T extends object>(
+  object: T,
+  initializationObject: {
+    [x in keyof T]: () => Promise<T[x]>;
+  },
+): Promise<void>;