Invalid VLQ source-map mappings in Turbopack for minified vendor code

Frontend engineers, SREs, and observability teams increasingly encounter invalid VLQ source-map mappings produced by Turbopack when bundling minified vendor code, causing browsers and error-tracking services to reject maps or display incorrect stack traces. That creates lost developer hours, noisy alerts, and delayed incident resolution for both small product teams and large platform organizations that rely on accurate mappings to triage production errors. A practical solution is an OSS-first Turbopack plugin plus a CLI/CI sanitizer that detects, repairs, or regenerates invalid VLQ entries in vendor sourcemaps, offers preflight validation, and provides runtime-safe fallbacks for observability integrations like Sentry and Datadog. Complementing the open-source validator with GitHub Actions, a SaaS dashboard for impact analytics, and enterprise build-pipeline plugins creates clear monetization paths (per-seat or per-build billing), while the core technical differentiator is deterministic VLQ re-encoding that preserves mapping fidelity and runs fast enough for CI/CD and CDN workflows. The timing is attractive: the addressable audience is roughly 27M professional developers and an estimated $25.9B annual developer-tools market (27M x $960), with rising spend on observability and bundlers, so I rate the market 92/100 and revenue potential 76/100. To win in a medium-competition landscape you should focus on deep Turbopack integration, partnerships with observability vendors, and an open-source-first trust strategy, while being realistic about challenges such as ecosystem fragmentation, the engineering effort to support many minifier outputs, potential legal considerations with third-party vendor code, and the go-to-market effort required to reach platform teams.