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feat(nextjs): Warn when client was initialized more than once #15971

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merged 1 commit into from
Apr 4, 2025
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feat(nextjs): Warn when client was initialized more than once #15971

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13 changes: 13 additions & 0 deletions packages/nextjs/src/client/index.ts
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Original file line number Diff line number Diff line change
@@ -1,4 +1,5 @@
import type { Client, EventProcessor, Integration } from '@sentry/core';
import { consoleSandbox } from '@sentry/core';
import { getGlobalScope } from '@sentry/core';
import { GLOBAL_OBJ, addEventProcessor, applySdkMetadata } from '@sentry/core';
import type { BrowserOptions } from '@sentry/react';
Expand All @@ -16,6 +17,8 @@ export * from '../common';
export { captureUnderscoreErrorException } from '../common/pages-router-instrumentation/_error';
export { browserTracingIntegration } from './browserTracingIntegration';

let clientIsInitialized = false;

const globalWithInjectedValues = GLOBAL_OBJ as typeof GLOBAL_OBJ & {
_sentryRewriteFramesAssetPrefixPath: string;
_sentryAssetPrefix?: string;
Expand All @@ -29,6 +32,16 @@ declare const __SENTRY_TRACING__: boolean;

/** Inits the Sentry NextJS SDK on the browser with the React SDK. */
export function init(options: BrowserOptions): Client | undefined {
if (clientIsInitialized) {
consoleSandbox(() => {
// eslint-disable-next-line no-console
console.warn(
'[@sentry/nextjs] You are calling `Sentry.init()` more than once on the client. This can happen if you have both a `sentry.client.config.ts` and a `instrumentation-client.ts` file with `Sentry.init()` calls. It is recommended to call `Sentry.init()` once in `instrumentation-client.ts`.',
);
});
}
clientIsInitialized = true;

const opts = {
environment: getVercelEnv(true) || process.env.NODE_ENV,
defaultIntegrations: getDefaultIntegrations(options),
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