feat(sveltekit): Inject Sentry.init calls into server and client bundles

packages/sveltekit/package.json

@@ -24,11 +24,13 @@
     "@sentry/node": "7.42.0",
     "@sentry/svelte": "7.42.0",
     "@sentry/types": "7.42.0",
-    "@sentry/utils": "7.42.0"
+    "@sentry/utils": "7.42.0",
+    "magic-string": "^0.30.0"
   },
   "devDependencies": {
-    "@sveltejs/kit": "^1.10.0",
-    "vite": "^4.0.0"
+    "@sveltejs/kit": "^1.5.0",
+    "vite": "4.0.0",
+    "typescript": "^4.9.3"
   },
   "scripts": {
     "build": "run-p build:transpile build:types",

packages/sveltekit/src/config/index.ts

@@ -0,0 +1 @@
+export { withSentryViteConfig } from './withSentryViteConfig';

packages/sveltekit/src/config/vitePlugins.ts

@@ -0,0 +1,73 @@
+import { logger } from '@sentry/utils';
+import * as fs from 'fs';
+import MagicString from 'magic-string';
+import * as path from 'path';
+import type { Plugin, TransformResult } from 'vite';
+
+/**
+ * This plugin injects the `Sentry.init` calls from `sentry.(client|server).config.(ts|js)`
+ * into SvelteKit runtime files.
+ */
+export const injectSentryInitPlugin: Plugin = {
+  name: 'sentry-init-injection-plugin',
+
+  // In this hook, we inject the `Sentry.init` calls from `sentry.(client|server).config.(ts|js)`
+  // into SvelteKit runtime files: For the server, we inject it into the server's `index.js`
+  // file. For the client, we use the `_app.js` file.
+  transform(code, id) {
+    const serverIndexFilePath = path.join('@sveltejs', 'kit', 'src', 'runtime', 'server', 'index.js');
+    const devClientAppFilePath = path.join('.svelte-kit', 'generated', 'client', 'app.js');
+    const prodClientAppFilePath = path.join('.svelte-kit', 'generated', 'client-optimized', 'app.js');
+
+    if (id.endsWith(serverIndexFilePath)) {
+      logger.debug('Injecting Server Sentry.init into', id);
+      return addSentryConfigFileImport('server', code, id) || code;
+    }
+
+    if (id.endsWith(devClientAppFilePath) || id.endsWith(prodClientAppFilePath)) {
+      logger.debug('Injecting Client Sentry.init into', id);
+      return addSentryConfigFileImport('client', code, id) || code;
+    }
+
+    return code;
+  },
+
+  // This plugin should run as early as possible,
+  // setting `enforce: 'pre'` ensures that it runs before the built-in vite plugins.
+  // see: https://vitejs.dev/guide/api-plugin.html#plugin-ordering
+  enforce: 'pre',
+};
+
+function addSentryConfigFileImport(
+  platform: 'server' | 'client',
+  originalCode: string,
+  entryFileId: string,
+): TransformResult | undefined {
+  const projectRoot = process.cwd();
+  const sentryConfigFilename = getUserConfigFile(projectRoot, platform);
+
+  if (!sentryConfigFilename) {
+    logger.error(`Could not find sentry.${platform}.config.(ts|js) file.`);
+    return undefined;
+  }
+
+  const filePath = path.join(path.relative(path.dirname(entryFileId), projectRoot), sentryConfigFilename);
+  const importStmt = `\nimport "${filePath}";`;
+
+  const ms = new MagicString(originalCode);
+  ms.append(importStmt);
+
+  return { code: ms.toString(), map: ms.generateMap() };
+}
+
+function getUserConfigFile(projectDir: string, platform: 'server' | 'client'): string | undefined {
+  const possibilities = [`sentry.${platform}.config.ts`, `sentry.${platform}.config.js`];
+
+  for (const filename of possibilities) {
+    if (fs.existsSync(path.resolve(projectDir, filename))) {
+      return filename;
+    }
+  }
+
+  throw new Error(`Cannot find '${possibilities[0]}' or '${possibilities[1]}' in '${projectDir}'.`);
+}

packages/sveltekit/src/config/withSentryViteConfig.ts

@@ -0,0 +1,52 @@
+import type { UserConfig, UserConfigExport } from 'vite';
+
+import { injectSentryInitPlugin } from './vitePlugins';
+
+/**
+ * This function adds Sentry-specific configuration to your Vite config.
+ * Pass your config to this function and make sure the return value is exported
+ * from your `vite.config.js` file.
+ *
+ * Note: If you're already wrapping your config with another wrapper,
+ * for instance with `defineConfig` from vitest, make sure
+ * that the Sentry wrapper is the outermost one.
+ *
+ * @param originalConfig your original vite config
+ *
+ * @returns a vite config with Sentry-specific configuration added to it.
+ */
+export function withSentryViteConfig(originalConfig: UserConfigExport): UserConfigExport {
+  if (typeof originalConfig === 'function') {
+    return function (this: unknown, ...viteConfigFunctionArgs: unknown[]): UserConfig | Promise<UserConfig> {
+      const userViteConfigObject = originalConfig.apply(this, viteConfigFunctionArgs);
+      if (userViteConfigObject instanceof Promise) {
+        return userViteConfigObject.then(userConfig => addSentryConfig(userConfig));
+      }
+      return addSentryConfig(userViteConfigObject);
+    };
+  } else if (originalConfig instanceof Promise) {
+    return originalConfig.then(userConfig => addSentryConfig(userConfig));
+  }
+  return addSentryConfig(originalConfig);
+}
+
+function addSentryConfig(originalConfig: UserConfig): UserConfig {
+  const config = {
+    ...originalConfig,
+    plugins: originalConfig.plugins ? [injectSentryInitPlugin, ...originalConfig.plugins] : [injectSentryInitPlugin],
+  };
+
+  const mergedDevServerFileSystemConfig: UserConfig['server'] = {
+    fs: {
+      ...(config.server && config.server.fs),
+      allow: [...((config.server && config.server.fs && config.server.fs.allow) || []), '.'],
+    },
+  };
+
+  config.server = {
+    ...config.server,
+    ...mergedDevServerFileSystemConfig,
+  };
+
+  return config;
+}

packages/sveltekit/src/index.server.ts

@@ -1,4 +1,5 @@
 export * from './server';
+export * from './config';
 
 // This file is the main entrypoint on the server and/or when the package is `require`d
 

packages/sveltekit/src/index.types.ts

@@ -4,6 +4,7 @@
 // Some of the exports collide, which is not allowed, unless we redifine the colliding
 // exports in this file - which we do below.
 export * from './client';
+export * from './config';
 export * from './server';
 
 import type { Integration, Options, StackParser } from '@sentry/types';

packages/sveltekit/test/config/vitePlugins.test.ts

@@ -0,0 +1,58 @@
+import * as fs from 'fs';
+
+import { injectSentryInitPlugin } from '../../src/config/vitePlugins';
+
+describe('injectSentryInitPlugin', () => {
+  it('has its basic properties set', () => {
+    expect(injectSentryInitPlugin.name).toBe('sentry-init-injection-plugin');
+    expect(injectSentryInitPlugin.enforce).toBe('pre');
+    expect(typeof injectSentryInitPlugin.transform).toBe('function');
+  });
+
+  describe('tansform', () => {
+    jest.spyOn(fs, 'existsSync').mockReturnValue(true);
+
+    it('transforms the server index file', () => {
+      const code = 'foo();';
+      const id = '/node_modules/@sveltejs/kit/src/runtime/server/index.js';
+
+      // @ts-ignore -- transform is definitely defined and callable. Seems like TS doesn't know that.
+      const result = injectSentryInitPlugin.transform(code, id);
+
+      expect(result.code).toMatch(/foo\(\);\n.*import ".*sentry\.server\.config\.ts";/gm);
+      expect(result.map).toBeDefined();
+    });
+
+    it('transforms the client index file (dev server)', () => {
+      const code = 'foo();';
+      const id = '.svelte-kit/generated/client/app.js';
+
+      // @ts-ignore -- transform is definitely defined and callable. Seems like TS doesn't know that.
+      const result = injectSentryInitPlugin.transform(code, id);
+
+      expect(result.code).toMatch(/foo\(\);\n.*import ".*sentry\.client\.config\.ts";/gm);
+      expect(result.map).toBeDefined();
+    });
+
+    it('transforms the client index file (prod build)', () => {
+      const code = 'foo();';
+      const id = '.svelte-kit/generated/client-optimized/app.js';
+
+      // @ts-ignore -- transform is definitely defined and callable. Seems like TS doesn't know that.
+      const result = injectSentryInitPlugin.transform(code, id);
+
+      expect(result.code).toMatch(/foo\(\);\n.*import ".*sentry\.client\.config\.ts";/gm);
+      expect(result.map).toBeDefined();
+    });
+
+    it("doesn't transform other files", () => {
+      const code = 'foo();';
+      const id = './src/routes/+page.ts';
+
+      // @ts-ignore -- transform is definitely defined and callable. Seems like TS doesn't know that.
+      const result = injectSentryInitPlugin.transform(code, id);
+
+      expect(result).toBe(code);
+    });
+  });
+});

packages/sveltekit/test/config/withSentryViteConfig.test.ts

@@ -0,0 +1,117 @@
+import { UserConfig, Plugin } from 'vite';
+import { withSentryViteConfig } from '../../src/config/withSentryViteConfig';
+
+describe('withSentryViteConfig', () => {
+  const originalConfig = {
+    plugins: [{ name: 'foo' }],
+    server: {
+      fs: {
+        allow: ['./bar'],
+      },
+    },
+    test: {
+      include: ['src/**/*.{test,spec}.{js,ts}'],
+    },
+  };
+
+  it('takes a POJO Vite config and returns the sentrified version', () => {
+    const sentrifiedConfig = withSentryViteConfig(originalConfig);
+
+    expect(typeof sentrifiedConfig).toBe('object');
+
+    const plugins = (sentrifiedConfig as UserConfig).plugins as Plugin[];
+
+    expect(plugins).toHaveLength(2);
+    expect(plugins[0].name).toBe('sentry-init-injection-plugin');
+    expect(plugins[1].name).toBe('foo');
+
+    expect((sentrifiedConfig as UserConfig).server?.fs?.allow).toStrictEqual(['./bar', '.']);
+
+    expect((sentrifiedConfig as any).test).toEqual(originalConfig.test);
+  });
+
+  it('takes a Vite config Promise and returns the sentrified version', async () => {
+    const sentrifiedConfig = await withSentryViteConfig(Promise.resolve(originalConfig));
+
+    expect(typeof sentrifiedConfig).toBe('object');
+
+    const plugins = (sentrifiedConfig as UserConfig).plugins as Plugin[];
+
+    expect(plugins).toHaveLength(2);
+    expect(plugins[0].name).toBe('sentry-init-injection-plugin');
+    expect(plugins[1].name).toBe('foo');
+
+    expect((sentrifiedConfig as UserConfig).server?.fs?.allow).toStrictEqual(['./bar', '.']);
+
+    expect((sentrifiedConfig as any).test).toEqual(originalConfig.test);
+  });
+
+  it('takes a function returning a Vite config and returns the sentrified version', () => {
+    const sentrifiedConfigFunction = withSentryViteConfig(_env => {
+      return originalConfig;
+    });
+    const sentrifiedConfig =
+      typeof sentrifiedConfigFunction === 'function' && sentrifiedConfigFunction({ command: 'build', mode: 'test' });
+
+    expect(typeof sentrifiedConfig).toBe('object');
+
+    const plugins = (sentrifiedConfig as UserConfig).plugins as Plugin[];
+
+    expect(plugins).toHaveLength(2);
+    expect(plugins[0].name).toBe('sentry-init-injection-plugin');
+    expect(plugins[1].name).toBe('foo');
+
+    expect((sentrifiedConfig as UserConfig).server?.fs?.allow).toStrictEqual(['./bar', '.']);
+
+    expect((sentrifiedConfig as any).test).toEqual(originalConfig.test);
+  });
+
+  it('takes a function returning a Vite config promise and returns the sentrified version', async () => {
+    const sentrifiedConfigFunction = withSentryViteConfig(_env => {
+      return Promise.resolve(originalConfig);
+    });
+    const sentrifiedConfig =
+      typeof sentrifiedConfigFunction === 'function' &&
+      (await sentrifiedConfigFunction({ command: 'build', mode: 'test' }));
+
+    expect(typeof sentrifiedConfig).toBe('object');
+
+    const plugins = (sentrifiedConfig as UserConfig).plugins as Plugin[];
+
+    expect(plugins).toHaveLength(2);
+    expect(plugins[0].name).toBe('sentry-init-injection-plugin');
+    expect(plugins[1].name).toBe('foo');
+
+    expect((sentrifiedConfig as UserConfig).server?.fs?.allow).toStrictEqual(['./bar', '.']);
+
+    expect((sentrifiedConfig as any).test).toEqual(originalConfig.test);
+  });
+
+  it('adds the vite plugin if no plugins are present', () => {
+    const sentrifiedConfig = withSentryViteConfig({
+      test: {
+        include: ['src/**/*.{test,spec}.{js,ts}'],
+      },
+    } as UserConfig);
+
+    expect(typeof sentrifiedConfig).toBe('object');
+
+    const plugins = (sentrifiedConfig as UserConfig).plugins as Plugin[];
+
+    expect(plugins).toHaveLength(1);
+    expect(plugins[0].name).toBe('sentry-init-injection-plugin');
+  });
+
+  it('adds the vite plugin and server config to an empty vite config', () => {
+    const sentrifiedConfig = withSentryViteConfig({});
+
+    expect(typeof sentrifiedConfig).toBe('object');
+
+    const plugins = (sentrifiedConfig as UserConfig).plugins as Plugin[];
+
+    expect(plugins).toHaveLength(1);
+    expect(plugins[0].name).toBe('sentry-init-injection-plugin');
+
+    expect((sentrifiedConfig as UserConfig).server?.fs?.allow).toStrictEqual(['.']);
+  });
+});