feat: v4.0.0 (#1016)

Co-authored-by: Denys Konovalov <kontakt@denyskon.de>
Co-authored-by: Mathieu COSYNS <64072917+Mathieu-COSYNS@users.noreply.github.com>

cypress/utils/config.ts

@@ -0,0 +1,42 @@
+import fs from 'fs-extra';
+import path from 'path';
+import yaml from 'js-yaml';
+
+import type { Config } from '@staticcms/core/interface';
+
+const devTestDirectory = path.join(__dirname, '..', '..', 'packages', 'core', 'dev-test');
+const backendsDirectory = path.join(devTestDirectory, 'backends');
+
+export async function copyBackendFiles(backend: string) {
+  await Promise.all(
+    ['config.yml', 'index.html'].map(file => {
+      return fs.copyFile(
+        path.join(backendsDirectory, backend, file),
+        path.join(devTestDirectory, file),
+      );
+    }),
+  );
+}
+
+export async function updateConfig(configModifier: (config: Config) => void) {
+  const configFile = path.join(devTestDirectory, 'config.yml');
+  const configContent = await fs.readFile(configFile, 'utf-8');
+  const config = yaml.load(configContent) as Config;
+  await configModifier(config);
+  await fs.writeFileSync(configFile, yaml.dump(config));
+}
+
+export async function switchVersion(version: string) {
+  const htmlFile = path.join(devTestDirectory, 'index.html');
+  const content = await fs.readFile(htmlFile);
+
+  const replaceString =
+    version === 'latest'
+      ? '<script src="dist/static-cms.js"></script>'
+      : `<script src="https://unpkg.com/@staticcms/app@${version}/dist/static-cms-app.js"></script>`;
+
+  await fs.writeFile(
+    htmlFile,
+    content.toString().replace(/<script src=".+?static-cms.+?"><\/script>/, replaceString),
+  );
+}