Support Trusted Types (require-trusted-types-for 'script')

[oioki]

Problem Statement

Apps that enforce Trusted Types (Content-Security-Policy: require-trusted-types-for 'script') can't use several SDK features without a pass-through default policy, which disables Trusted Types for the whole page.

Repro: https://github.com/oioki/trusted-types-sentry-js-sdk. It's a minimal Vite + React app with @sentry/react 11.0.0 and no Trusted Types policies of its own, so every violation comes from the SDK.

Sink	Where	Enforced result	Workaround
new Worker(url)	Replay compression worker	Caught; replay continues	useCompression: false (larger payloads)
innerHTML	Feedback form (dangerouslySetInnerHTML: logo, success icon, screenshot styles)	Form doesn't render	showBranding: false covers the logo only
script.src	showReportDialog()	Throws, no dialog	None
innerHTML	error-page-embed.js (served by Sentry)	Blocked once the dialog loads	None
script.src	lazyLoadIntegration()	Throws	None
script.src	Loader Script	Throws	None

The workaround in #15913 (workerUrl) doesn't help: new Worker(url) requires a TrustedScriptURL for any string URL, not just blob: URLs, so a self-hosted worker still violates.

Teams with a strict CSP (enterprise, fintech, public sector, Angular and Lit users) currently have to choose between Sentry's Replay, Feedback and User Feedback dialog and enforcing Trusted Types. Teams in report-only rollout also get SDK noise in their violation reports, with no policy name they can allow.

Solution Brainstorm

• The SDK creates one named policy, e.g. sentry-sdk, that validates rather than passes values through. It would allow only script URLs the SDK builds itself (DSN host plus the known paths, the CDN) and only static HTML. Apps allow it with trusted-types sentry-sdk.
• Remove the innerHTML uses in feedback by building the SVG and styles with DOM APIs.
• Document the CSP needed (trusted-types sentry-sdk, and 'allow-duplicates' when more than one SDK copy is on the page).

Additional Context

#24738 is a first step: a shared sentry-sdk policy helper, used by showReportDialog.

Priority

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[linear-code]

JS-3808