From 8de63be6ba29e3f505bd977bdc29251587106bce Mon Sep 17 00:00:00 2001
From: Erica Marigold <hi@devcomp.xyz>
Date: Fri, 27 Dec 2024 11:42:34 +0000
Subject: [PATCH] chore(build): move `exports.d.ts` to `index.d.ts` in build
 step

---
 build.ts      | 30 +++++++++++++++++++++++++++---
 package.json  |  1 +
 tsconfig.json |  3 ++-
 3 files changed, 30 insertions(+), 4 deletions(-)

diff --git a/build.ts b/build.ts
index af2443b..ce54ff3 100644
--- a/build.ts
+++ b/build.ts
@@ -1,3 +1,17 @@
+import { write } from "bun";
+import { copyFile } from "fs/promises";
+import { unlink } from "fs/promises";
+import path from "path";
+
+// changes the extension of a path to `newExt`
+function withExtension(filePath: string, newExt: string): string {
+	const dir = path.dirname(filePath);
+	const base = path.basename(filePath, path.extname(filePath));
+
+	const newFilePath = path.join(dir, `${base}.${newExt}`);
+	return newFilePath;
+}
+
 // extracts the Luau exports section from a given file path
 async function extractLuauExports(file: string): Promise<string | null> {
 	const input = await Bun.file(file).text();
@@ -15,10 +29,20 @@ async function extractLuauExports(file: string): Promise<string | null> {
 	return null;
 }
 
+const OUT_DIR = "./out";
 const EXPORTS_TS_FILE = "./src/exports.ts";
-const EXPORTS_LUAU_FILE = "./out/init.luau";
+const EXPORTS_LUAU_FILE = path.join(OUT_DIR, "init.luau");
 
-console.log("extract and export Luau type thunk");
-await extractLuauExports(EXPORTS_TS_FILE).then((exports) => Bun.write(EXPORTS_LUAU_FILE, exports!));
+await extractLuauExports(EXPORTS_TS_FILE)
+	.then(async (exports) => {
+		console.log("extract and export luau type thunk");
+		await write(EXPORTS_LUAU_FILE, exports!);
+	})
+	.finally(async () => {
+		console.log("export ts definition files");
+
+		const luauExportsFile = path.join(OUT_DIR, path.basename(withExtension(EXPORTS_TS_FILE, "d.ts")));
+		await write(path.join(OUT_DIR, "index.d.ts"), Bun.file(luauExportsFile));
+	});
 
 export {}; // treat as esmodule
diff --git a/package.json b/package.json
index 6f09c94..bdf4655 100644
--- a/package.json
+++ b/package.json
@@ -25,6 +25,7 @@
 	"types": "out/index.d.ts",
 	"files": [
 		"out",
+		"!out/exports.d.ts",
 		"!**/*.tsbuildinfo"
 	],
 	"publishConfig": {
diff --git a/tsconfig.json b/tsconfig.json
index baab57e..2401fa5 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -25,5 +25,6 @@
 		"declaration": true
 	},
 
-	"include": ["src/**/*.ts"]
+	// exclude build script
+	"exclude": ["build.ts"]
 }