Graduate file editing from experimental (#599)

e2e-tests/edit_code.spec.ts

+import { test } from "./helpers/test_helper";
+import { expect } from "@playwright/test";
+import fs from "fs";
+import path from "path";
+
+test("edit code", async ({ po }) => {
+  const editedFilePath = path.join("src", "components", "made-with-dyad.tsx");
+  await po.sendPrompt("foo");
+  const appPath = await po.getCurrentAppPath();
+
+  await po.clickTogglePreviewPanel();
+
+  await po.selectPreviewMode("code");
+  await po.page.getByText("made-with-dyad.tsx").click();
+  await po.page
+    .getByRole("code")
+    .locator("div")
+    .filter({ hasText: "export const" })
+    .nth(4)
+    .click();
+  await po.page
+    .getByRole("textbox", { name: "Editor content" })
+    .fill("export const MadeWithDyad = ;");
+
+  // Save the file
+  await po.page.getByTestId("save-file-button").click();
+
+  // Expect toast to be visible
+  await expect(po.page.getByText("File saved")).toBeVisible();
+
+  // We are NOT snapshotting the app files because the Monaco UI edit
+  // is not deterministic.
+  const editedFile = fs.readFileSync(
+    path.join(appPath, editedFilePath),
+    "utf8",
+  );
+  expect(editedFile).toContain("export const MadeWithDyad = ;");
+});
+
+test("edit code edits the right file", async ({ po }) => {
+  const editedFilePath = path.join("src", "components", "made-with-dyad.tsx");
+  const robotsFilePath = path.join("public", "robots.txt");
+  await po.sendPrompt("foo");
+  const appPath = await po.getCurrentAppPath();
+  const originalRobotsFile = fs.readFileSync(
+    path.join(appPath, robotsFilePath),
+    "utf8",
+  );
+
+  await po.clickTogglePreviewPanel();
+
+  await po.selectPreviewMode("code");
+  await po.page.getByText("made-with-dyad.tsx").click();
+  await po.page
+    .getByRole("code")
+    .locator("div")
+    .filter({ hasText: "export const" })
+    .nth(4)
+    .click();
+  await po.page
+    .getByRole("textbox", { name: "Editor content" })
+    .fill("export const MadeWithDyad = ;");
+
+  // Save the file by switching files
+  await po.page.getByText("robots.txt").click();
+
+  // Expect toast to be visible
+  await expect(po.page.getByText("File saved")).toBeVisible();
+
+  // We are NOT snapshotting the app files because the Monaco UI edit
+  // is not deterministic.
+  const editedFile = fs.readFileSync(
+    path.join(appPath, editedFilePath),
+    "utf8",
+  );
+  expect(editedFile).toContain("export const MadeWithDyad = ;");
+
+  // Make sure the robots.txt file is not edited
+  const editedRobotsFile = fs.readFileSync(
+    path.join(appPath, robotsFilePath),
+    "utf8",
+  );
+  expect(editedRobotsFile).toEqual(originalRobotsFile);
+});