The original title is: "The Turborepo + Bun + Biome stack behind a 40-package monorepo"

Short summary

A solo maintainer details the real Turborepo + Bun + Biome toolchain powering flare-engine, a 40-package monorepo for a modular 2D React Native + Web engine. The core thesis is that a single maintainer can only keep forty packages honest if there is exactly one root config of each kind that every package extends. The post shares the actual turbo.json, biome.json, root package.json, and CI guardrails straight from the repo, including dependency-graph caching, parallel linting, and custom import-tier checks.

• •Single-root-config-per-tool approach governs all 40 packages from one file each
• •Bun serves as runtime, package manager, and test runner in one binary
• •Turborepo cache keys bust across all packages when root configs change

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