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fix(server-runtime-injection): Load ESM hook without the build/esm package.json marker - #25562

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What

The diagnostics-channel hook now loads as ESM even when build/esm/package.json is missing from a deployment.

Why

Vercel runs Node 22 with syntax detection off, so without that file the hook failed to load and channel-based spans were lost.

Closes: #25480

…ckage.json marker

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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size-limit report 📦

Path Size % Change Change
@sentry/browser 29.88 kB - -
@sentry/browser - with treeshaking flags 28.02 kB - -
@sentry/browser - with treeshaking flags tracing without tracing 27.92 kB - -
@sentry/browser (incl. Tracing) 52.07 kB - -
@sentry/browser (incl. Tracing + Span Streaming) 52.07 kB - -
@sentry/browser (incl. Tracing, Profiling) 55.02 kB - -
@sentry/browser (incl. Tracing, Replay) 91.82 kB - -
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags 80.68 kB - -
@sentry/browser (incl. Tracing, Replay with Canvas) 96.55 kB - -
@sentry/browser (incl. Tracing, Replay, Feedback) 109.49 kB - -
@sentry/browser (incl. Feedback) 47.4 kB - -
@sentry/browser (incl. sendFeedback) 34.94 kB - -
@sentry/browser (incl. FeedbackAsync) 40.05 kB - -
@sentry/browser (incl. Metrics) 30.9 kB - -
@sentry/browser (incl. Logs) 31.18 kB - -
@sentry/browser (incl. Metrics & Logs) 31.81 kB - -
@sentry/react 31.7 kB - -
@sentry/react (incl. Tracing) 54.39 kB - -
@sentry/vue 38.04 kB - -
@sentry/vue (incl. Tracing) 55.01 kB - -
@sentry/svelte 29.9 kB - -
@sentry/remix (Remix 3 client bundle) 57.08 kB - -
CDN Bundle 31.64 kB - -
CDN Bundle (incl. Tracing) 52.58 kB - -
CDN Bundle (incl. Logs, Metrics) 33.84 kB - -
CDN Bundle (incl. Tracing, Logs, Metrics) 54.52 kB - -
CDN Bundle (incl. Replay, Logs, Metrics) 74.77 kB - -
CDN Bundle (incl. Tracing, Replay) 90.25 kB - -
CDN Bundle (incl. Tracing, Replay, Logs, Metrics) 92.18 kB - -
CDN Bundle (incl. Tracing, Replay, Feedback) 96.4 kB - -
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics) 98.34 kB - -
CDN Bundle - uncompressed 93.18 kB - -
CDN Bundle (incl. Tracing) - uncompressed 156.03 kB - -
CDN Bundle (incl. Logs, Metrics) - uncompressed 99.72 kB - -
CDN Bundle (incl. Tracing, Logs, Metrics) - uncompressed 161.99 kB - -
CDN Bundle (incl. Replay, Logs, Metrics) - uncompressed 229.76 kB - -
CDN Bundle (incl. Tracing, Replay) - uncompressed 276.2 kB - -
CDN Bundle (incl. Tracing, Replay, Logs, Metrics) - uncompressed 282.14 kB - -
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed 289.9 kB - -
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics) - uncompressed 295.84 kB - -
@sentry/nextjs (client) 56.88 kB - -
@sentry/sveltekit (client) 52.45 kB - -
@sentry/core/server 41.17 kB - -
@sentry/core/browser 13.81 kB - -
@sentry/node 155.24 kB +0.07% +96 B 🔺
@sentry/node/import (ESM hook with diagnostics-channel injection) 84.17 kB +0.13% +108 B 🔺
@sentry/node - without tracing 96.91 kB +0.11% +102 B 🔺
@sentry/node - without channel injection 133.17 kB - -
@sentry/aws-serverless 105.11 kB +0.09% +93 B 🔺
@sentry/cloudflare (withSentry) - minified 210.89 kB - -
@sentry/cloudflare (withSentry) 523.17 kB - -
@sentry/nextjs/cloudflare (withSentry) - minified 229.21 kB - -

View base workflow run

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Cursor Bugbot has reviewed your changes and found 1 potential issue.

Fix All in Cursor

❌ Bugbot Autofix is OFF. To automatically fix reported issues with cloud agents, enable autofix in the Cursor dashboard.

Reviewed by Cursor Bugbot for commit 5084a8e. Configure here.

`const d=${JSON.stringify(esmDirUrl)};export async function load(u,c,n){return n(u,u.startsWith(d)?{...c,format:'module'}:c)}`,
)}`,
);
}

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Fix PR missing regression test

Medium Severity

This fix PR adds no unit, integration, or E2E test that the diagnostics-channel hook still loads when build/esm/package.json is absent. I flagged this because the review rules require a regression test that fails without the change and passes with it.

Fix in Cursor Fix in Web

Triggered by project rule: PR Review Guidelines for Cursor Bot

Reviewed by Cursor Bugbot for commit 5084a8e. Configure here.

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server-runtime-injection: build/esm/package.json is not traced, so hook.js fails to load as ESM on Vercel (Node 22)

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