allow for js or ts user config files

Author: lobsterkatie

packages/nextjs/src/config/types.ts

@@ -43,7 +43,7 @@ export type WebpackConfigObject = {
 };
 
 // Information about the current build environment
-export type BuildContext = { dev: boolean; isServer: boolean; buildId: string };
+export type BuildContext = { dev: boolean; isServer: boolean; buildId: string; dir: string };
 
 /**
  * Webpack `entry` config

packages/nextjs/src/config/webpack.ts

@@ -1,6 +1,8 @@
 import { getSentryRelease } from '@sentry/node';
 import { dropUndefinedKeys, logger } from '@sentry/utils';
 import * as SentryWebpackPlugin from '@sentry/webpack-plugin';
+import * as fs from 'fs';
+import * as path from 'path';
 
 import {
   BuildContext,
@@ -19,9 +21,6 @@ export { SentryWebpackPlugin };
 // TODO: merge default SentryWebpackPlugin include with their SentryWebpackPlugin include
 // TODO: drop merged keys from override check? `includeDefaults` option?
 
-export const CLIENT_SDK_CONFIG_FILE = './sentry.client.config.js';
-export const SERVER_SDK_CONFIG_FILE = './sentry.server.config.js';
-
 const defaultSentryWebpackPluginOptions = dropUndefinedKeys({
   url: process.env.SENTRY_URL,
   org: process.env.SENTRY_ORG,
@@ -132,7 +131,9 @@ async function addSentryToEntryProperty(
   const newEntryProperty =
     typeof currentEntryProperty === 'function' ? await currentEntryProperty() : { ...currentEntryProperty };
 
-  const userConfigFile = buildContext.isServer ? SERVER_SDK_CONFIG_FILE : CLIENT_SDK_CONFIG_FILE;
+  const userConfigFile = buildContext.isServer
+    ? getUserConfigFile(buildContext.dir, 'server')
+    : getUserConfigFile(buildContext.dir, 'client');
 
   for (const entryPointName in newEntryProperty) {
     if (entryPointName === 'pages/_app' || entryPointName.includes('pages/api')) {
@@ -143,6 +144,33 @@ async function addSentryToEntryProperty(
   return newEntryProperty;
 }
 
+/**
+ * Search the project directory for a valid user config file for the given platform, allowing for it to be either a
+ * TypeScript or JavaScript file.
+ *
+ * @param projectDir The root directory of the project, where the file should be located
+ * @param platform Either "server" or "client", so that we know which file to look for
+ * @returns The name of the relevant file. If no file is found, this method throws an error.
+ */
+function getUserConfigFile(projectDir: string, platform: 'server' | 'client'): string {
+  let configFile;
+
+  const possibilities = [`sentry.${platform}.config.ts`, `sentry.${platform}.config.js`];
+
+  for (const filename of possibilities) {
+    if (fs.existsSync(path.resolve(projectDir, filename))) {
+      configFile = filename;
+      break;
+    }
+  }
+
+  if (!configFile) {
+    throw new Error(`Cannot find ${possibilities[0]} or ${possibilities[1]} in ${projectDir}`);
+  }
+
+  return configFile;
+}
+
 /**
  * Add a file to a specific element of the given `entry` webpack config property.
  *