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DISCO-282: Report why the local preview doesn't load - #462
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Philipp Koytek (philippkoytek) wants to merge 3 commits into
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Philipp Koytek (philippkoytek) wants to merge 3 commits into
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sdk preview now adds the Celonis app reporter as the first element of every proxied HTML page and allows it by its hash in the preview CSP. The reporter tells the Celonis preview that the page loaded, how many inline scripts the preview blocks, and which errors stopped the app, so the Codehub can show the matching hint right away. Co-Authored-By: Claude <noreply@anthropic.com> Includes-AI-Code: true
The reporter is copied from ems-frontend's SANDBOX_APP_REPORTER, which is now built from typed observers. The proxy hashes the copy it injects and adds that hash to script-src, so LOCAL_PREVIEW_HEADERS stays equal to ems-frontend's localPreviewHeaders(). The spec checks the report messages, which are the contract with ems-frontend. Co-Authored-By: Claude <noreply@anthropic.com> Includes-AI-Code: true
Co-Authored-By: Claude <noreply@anthropic.com> Includes-AI-Code: true
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Philipp Koytek (philippkoytek)
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November 11, 2026 17:54
Philipp Koytek (philippkoytek)
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November 11, 2026 17:54
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Description
content-cli sdk previewnow injects a small reporter script as the first element of every proxied HTML page and adds its SHA-256 hash toscript-src. The app's own inline scripts stay blocked unless--allow-inline-scriptsis passed.The reporter posts to the Celonis preview that the page loaded, how many inline scripts the preview blocks, and which uncaught errors, rejections and CSP violations stopped the app. With that, the Codehub Local preview can show the matching hint right away instead of waiting for the SDK: preview not reachable, inline scripts blocked, or the app's error.
preview-app-reporter.ts: copy ofSANDBOX_APP_REPORTERfrom ems-frontend andinjectAppReporter(). The proxy computes the hash at runtime, soLOCAL_PREVIEW_HEADERSstays equal to ems-frontend'slocalPreviewHeaders().Relevant links
Checklist
localStorageerror, blocked external request)Co-Authored-By: Claude noreply@anthropic.com
Includes-AI-Code: true