refactor: split config module

src/config/talk.ts

@@ -0,0 +1,45 @@
+import fs from "node:fs";
+import os from "node:os";
+import path from "node:path";
+
+type TalkApiKeyDeps = {
+  fs?: typeof fs;
+  os?: typeof os;
+  path?: typeof path;
+};
+
+export function readTalkApiKeyFromProfile(
+  deps: TalkApiKeyDeps = {},
+): string | null {
+  const fsImpl = deps.fs ?? fs;
+  const osImpl = deps.os ?? os;
+  const pathImpl = deps.path ?? path;
+
+  const home = osImpl.homedir();
+  const candidates = [".profile", ".zprofile", ".zshrc", ".bashrc"].map(
+    (name) => pathImpl.join(home, name),
+  );
+  for (const candidate of candidates) {
+    if (!fsImpl.existsSync(candidate)) continue;
+    try {
+      const text = fsImpl.readFileSync(candidate, "utf-8");
+      const match = text.match(
+        /(?:^|\n)\s*(?:export\s+)?ELEVENLABS_API_KEY\s*=\s*["']?([^\n"']+)["']?/,
+      );
+      const value = match?.[1]?.trim();
+      if (value) return value;
+    } catch {
+      // Ignore profile read errors.
+    }
+  }
+  return null;
+}
+
+export function resolveTalkApiKey(
+  env: NodeJS.ProcessEnv = process.env,
+  deps: TalkApiKeyDeps = {},
+): string | null {
+  const envValue = (env.ELEVENLABS_API_KEY ?? "").trim();
+  if (envValue) return envValue;
+  return readTalkApiKeyFromProfile(deps);
+}