refactor: migrate src/lsp/server.ts from Bun.file()/Bun.write() to Filesystem module (#14138)

packages/opencode/test/util/filesystem.test.ts

@@ -285,4 +285,125 @@ describe("filesystem", () => {
       expect(Filesystem.mimeType("Makefile")).toBe("application/octet-stream")
     })
   })
+
+  describe("writeStream()", () => {
+    test("writes from Web ReadableStream", async () => {
+      await using tmp = await tmpdir()
+      const filepath = path.join(tmp.path, "streamed.txt")
+      const content = "Hello from stream!"
+      const encoder = new TextEncoder()
+      const stream = new ReadableStream({
+        start(controller) {
+          controller.enqueue(encoder.encode(content))
+          controller.close()
+        },
+      })
+
+      await Filesystem.writeStream(filepath, stream)
+
+      expect(await fs.readFile(filepath, "utf-8")).toBe(content)
+    })
+
+    test("writes from Node.js Readable stream", async () => {
+      await using tmp = await tmpdir()
+      const filepath = path.join(tmp.path, "node-streamed.txt")
+      const content = "Hello from Node stream!"
+      const { Readable } = await import("stream")
+      const stream = Readable.from([content])
+
+      await Filesystem.writeStream(filepath, stream)
+
+      expect(await fs.readFile(filepath, "utf-8")).toBe(content)
+    })
+
+    test("writes binary data from Web ReadableStream", async () => {
+      await using tmp = await tmpdir()
+      const filepath = path.join(tmp.path, "binary.dat")
+      const binaryData = new Uint8Array([0x00, 0x01, 0x02, 0x03, 0xff])
+      const stream = new ReadableStream({
+        start(controller) {
+          controller.enqueue(binaryData)
+          controller.close()
+        },
+      })
+
+      await Filesystem.writeStream(filepath, stream)
+
+      const read = await fs.readFile(filepath)
+      expect(Buffer.from(read)).toEqual(Buffer.from(binaryData))
+    })
+
+    test("writes large content in chunks", async () => {
+      await using tmp = await tmpdir()
+      const filepath = path.join(tmp.path, "large.txt")
+      const chunks = ["chunk1", "chunk2", "chunk3", "chunk4", "chunk5"]
+      const stream = new ReadableStream({
+        start(controller) {
+          for (const chunk of chunks) {
+            controller.enqueue(new TextEncoder().encode(chunk))
+          }
+          controller.close()
+        },
+      })
+
+      await Filesystem.writeStream(filepath, stream)
+
+      expect(await fs.readFile(filepath, "utf-8")).toBe(chunks.join(""))
+    })
+
+    test("creates parent directories", async () => {
+      await using tmp = await tmpdir()
+      const filepath = path.join(tmp.path, "nested", "deep", "streamed.txt")
+      const content = "nested stream content"
+      const stream = new ReadableStream({
+        start(controller) {
+          controller.enqueue(new TextEncoder().encode(content))
+          controller.close()
+        },
+      })
+
+      await Filesystem.writeStream(filepath, stream)
+
+      expect(await fs.readFile(filepath, "utf-8")).toBe(content)
+    })
+
+    test("writes with permissions", async () => {
+      await using tmp = await tmpdir()
+      const filepath = path.join(tmp.path, "protected-stream.txt")
+      const content = "secret stream content"
+      const stream = new ReadableStream({
+        start(controller) {
+          controller.enqueue(new TextEncoder().encode(content))
+          controller.close()
+        },
+      })
+
+      await Filesystem.writeStream(filepath, stream, 0o600)
+
+      const stats = await fs.stat(filepath)
+      if (process.platform !== "win32") {
+        expect(stats.mode & 0o777).toBe(0o600)
+      }
+    })
+
+    test("writes executable with permissions", async () => {
+      await using tmp = await tmpdir()
+      const filepath = path.join(tmp.path, "script.sh")
+      const content = "#!/bin/bash\necho hello"
+      const stream = new ReadableStream({
+        start(controller) {
+          controller.enqueue(new TextEncoder().encode(content))
+          controller.close()
+        },
+      })
+
+      await Filesystem.writeStream(filepath, stream, 0o755)
+
+      const stats = await fs.stat(filepath)
+      if (process.platform !== "win32") {
+        expect(stats.mode & 0o777).toBe(0o755)
+      }
+      expect(await fs.readFile(filepath, "utf-8")).toBe(content)
+    })
+  })
 })