refactor(server): canonicalize service API (#31049)

packages/tui/src/component/prompt/local-attachment.ts

@@ -0,0 +1,19 @@
+import type { PlatformFiles } from "../../platform"
+
+export type LocalAttachment =
+  | Readonly<{ type: "text"; mime: "image/svg+xml"; content: string }>
+  | Readonly<{ type: "binary"; mime: string; content: Uint8Array }>
+
+export async function readLocalAttachment(files: PlatformFiles, path: string): Promise<LocalAttachment | undefined> {
+  const mime = await files.mime(path).catch(() => undefined)
+  if (!mime) return
+  if (mime === "image/svg+xml") {
+    const content = await files.readText(path).catch(() => undefined)
+    if (!content) return
+    return { type: "text", mime, content }
+  }
+  if (!mime.startsWith("image/") && mime !== "application/pdf") return
+  const content = await files.readBytes(path).catch(() => undefined)
+  if (!content) return
+  return { type: "binary", mime, content }
+}