feat(sveltekit): Auto-detect SvelteKit adapters (#8193)

First step for Vercel support: Detecting the used SvelteKit adapter.

(This currently does nothing other than detecting the adapter; next step
is to configure the source maps plugin correctly for the respective
adapters)

ref #8085

packages/sveltekit/src/vite/detectAdapter.ts

@@ -0,0 +1,62 @@
+import type { Package } from '@sentry/types';
+import * as fs from 'fs';
+import * as path from 'path';
+
+/**
+ * Supported @sveltejs/adapters-[adapter] SvelteKit adapters
+ */
+export type SupportedSvelteKitAdapters = 'node' | 'auto' | 'vercel' | 'other';
+
+/**
+ * Tries to detect the used adapter for SvelteKit by looking at the dependencies.
+ * returns the name of the adapter or 'other' if no supported adapter was found.
+ */
+export async function detectAdapter(debug?: boolean): Promise<SupportedSvelteKitAdapters> {
+  const pkgJson = await loadPackageJson();
+
+  const allDependencies = pkgJson ? { ...pkgJson.dependencies, ...pkgJson.devDependencies } : {};
+
+  let adapter: SupportedSvelteKitAdapters = 'other';
+  if (allDependencies['@sveltejs/adapter-vercel']) {
+    adapter = 'vercel';
+  } else if (allDependencies['@sveltejs/adapter-node']) {
+    adapter = 'node';
+  } else if (allDependencies['@sveltejs/adapter-auto']) {
+    adapter = 'auto';
+  }
+
+  if (debug) {
+    if (adapter === 'other') {
+      // eslint-disable-next-line no-console
+      console.warn(
+        "[Sentry SvelteKit Plugin] Couldn't detect SvelteKit adapter. Please set the 'adapter' option manually.",
+      );
+    } else {
+      // eslint-disable-next-line no-console
+      console.log(`[Sentry SvelteKit Plugin] Detected SvelteKit ${adapter} adapter`);
+    }
+  }
+
+  return adapter;
+}
+
+/**
+ * Imports the pacakge.json file and returns the parsed JSON object.
+ */
+async function loadPackageJson(): Promise<Package | undefined> {
+  const pkgFile = path.join(process.cwd(), 'package.json');
+
+  try {
+    if (!fs.existsSync(pkgFile)) {
+      throw new Error(`File ${pkgFile} doesn't exist}`);
+    }
+
+    const pkgJsonContent = (await fs.promises.readFile(pkgFile, 'utf-8')).toString();
+
+    return JSON.parse(pkgJsonContent);
+  } catch (e) {
+    // eslint-disable-next-line no-console
+    console.warn("[Sentry SvelteKit Plugin] Couldn't load package.json:", e);
+    return undefined;
+  }
+}

packages/sveltekit/src/vite/sentryVitePlugins.ts

@@ -3,6 +3,8 @@ import type { Plugin } from 'vite';
 
 import type { AutoInstrumentSelection } from './autoInstrument';
 import { makeAutoInstrumentationPlugin } from './autoInstrument';
+import type { SupportedSvelteKitAdapters } from './detectAdapter';
+import { detectAdapter } from './detectAdapter';
 import { makeCustomSentryVitePlugin } from './sourceMaps';
 
 type SourceMapsUploadOptions = {
@@ -39,6 +41,24 @@ export type SentrySvelteKitPluginOptions = {
    * @default false.
    */
   debug?: boolean;
+
+  /**
+   * Specify which SvelteKit adapter you're using.
+   * By default, the SDK will attempt auto-detect the used adapter at build time and apply the
+   * correct config for source maps upload or auto-instrumentation.
+   *
+   * Currently, the SDK supports the following adapters:
+   * - node (@sveltejs/adapter-node)
+   * - auto (@sveltejs/adapter-auto) only Vercel
+   * - vercel (@sveltejs/adapter-auto) only Serverless functions, no edge runtime
+   *
+   * Set this option, if the SDK detects the wrong adapter or you want to use an adapter
+   * that is not in this list. If you specify 'other', you'll most likely need to configure
+   * source maps upload yourself.
+   *
+   * @default {} the SDK attempts to auto-detect the used adapter at build time
+   */
+  adapter?: SupportedSvelteKitAdapters;
 } & SourceMapsUploadOptions &
   AutoInstrumentOptions;
 
@@ -59,6 +79,7 @@ export async function sentrySvelteKit(options: SentrySvelteKitPluginOptions = {}
   const mergedOptions = {
     ...DEFAULT_PLUGIN_OPTIONS,
     ...options,
+    adapter: options.adapter || (await detectAdapter(options.debug || false)),
   };
 
   const sentryPlugins: Plugin[] = [];

packages/sveltekit/test/vite/detectAdapter.test.ts

@@ -0,0 +1,79 @@
+import { vi } from 'vitest';
+
+import { detectAdapter } from '../../src/vite/detectAdapter';
+
+let existsFile = true;
+const pkgJson = {
+  dependencies: {},
+};
+describe('detectAdapter', () => {
+  beforeEach(() => {
+    existsFile = true;
+    vi.clearAllMocks();
+    pkgJson.dependencies = {};
+  });
+
+  vi.mock('fs', () => {
+    return {
+      existsSync: () => existsFile,
+      promises: {
+        readFile: () => {
+          return Promise.resolve(JSON.stringify(pkgJson));
+        },
+      },
+    };
+  });
+
+  const consoleWarnSpy = vi.spyOn(console, 'warn').mockImplementation(() => {});
+  const consoleLogSpy = vi.spyOn(console, 'log').mockImplementation(() => {});
+
+  it.each(['auto', 'vercel', 'node'])(
+    'returns the adapter name (adapter %s) and logs it to the console',
+    async adapter => {
+      pkgJson.dependencies[`@sveltejs/adapter-${adapter}`] = '1.0.0';
+      const detectedAdapter = await detectAdapter(true);
+      expect(detectedAdapter).toEqual(adapter);
+      expect(consoleLogSpy).toHaveBeenCalledTimes(1);
+      expect(consoleLogSpy).toHaveBeenCalledWith(expect.stringContaining(`Detected SvelteKit ${adapter} adapter`));
+    },
+  );
+
+  it('returns "other" if no supported adapter was found', async () => {
+    pkgJson.dependencies['@sveltejs/adapter-netlify'] = '1.0.0';
+    const detectedAdapter = await detectAdapter();
+    expect(detectedAdapter).toEqual('other');
+  });
+
+  it('logs a warning if in debug mode and no supported adapter was found', async () => {
+    pkgJson.dependencies['@sveltejs/adapter-netlify'] = '1.0.0';
+    const detectedAdapter = await detectAdapter(true);
+    expect(detectedAdapter).toEqual('other');
+    expect(consoleWarnSpy).toHaveBeenCalledTimes(1);
+    expect(consoleWarnSpy).toHaveBeenCalledWith(expect.stringContaining("Couldn't detect SvelteKit adapter"));
+  });
+
+  it('returns "other" if package.json isnt available and emits a warning log', async () => {
+    existsFile = false;
+    const detectedAdapter = await detectAdapter();
+    expect(detectedAdapter).toEqual('other');
+
+    expect(consoleWarnSpy).toHaveBeenCalledTimes(1);
+    expect(consoleWarnSpy).toHaveBeenCalledWith(
+      expect.stringContaining("Couldn't load package.json"),
+      expect.any(Error),
+    );
+  });
+
+  it('prefers all other adapters over adapter auto', async () => {
+    pkgJson.dependencies['@sveltejs/adapter-auto'] = '1.0.0';
+    pkgJson.dependencies['@sveltejs/adapter-vercel'] = '1.0.0';
+    pkgJson.dependencies['@sveltejs/adapter-node'] = '1.0.0';
+
+    const detectedAdapter = await detectAdapter();
+    expect(detectedAdapter).toEqual('vercel');
+
+    delete pkgJson.dependencies['@sveltejs/adapter-vercel'];
+    const detectedAdapter2 = await detectAdapter();
+    expect(detectedAdapter2).toEqual('node');
+  });
+});

packages/sveltekit/test/vite/sentrySvelteKitPlugins.test.ts

@@ -17,7 +17,14 @@ vi.mock('fs', async () => {
   };
 });
 
-describe('sentryVite()', () => {
+vi.spyOn(console, 'log').mockImplementation(() => {
+  /* noop */
+});
+vi.spyOn(console, 'warn').mockImplementation(() => {
+  /* noop */
+});
+
+describe('sentrySvelteKit()', () => {
   it('returns an array of Vite plugins', async () => {
     const plugins = await sentrySvelteKit();
 

packages/types/src/package.ts

@@ -2,4 +2,6 @@
 export interface Package {
   name: string;
   version: string;
+  dependencies?: Record<string, string>;
+  devDependencies?: Record<string, string>;
 }