turbo.json

{
  "$schema": "https://v2-9-12.turborepo.dev/schema.json",
  "envMode": "loose",
  // Local cache eviction is opt-in until Turborepo 3.0, so without these the
  // filesystem cache grows forever. In CI each cache dir is a Blacksmith sticky
  // disk that is mounted many times a day, so it never goes idle long enough for
  // Blacksmith's own 7-day inactivity purge to fire, and one cache-missing app
  // build writes a ~400 MB artifact: the build cache reached 206 GB in 43 days.
  //
  // Size is the real bound and age is hygiene. A hit only happens when a task's
  // input hash is unchanged — a re-run, or a commit touching only unrelated
  // workspaces — which recurs within hours, so nothing older than a day or two
  // can ever be read again. Measured hit rate on the app build is ~17%, worth
  // ~7 minutes each, so the cache earns its keep; it just needs a ceiling.
  // 40 GB is ~100 app-sized artifacts against ~4.8 GB/day of real accumulation.
  //
  // Neither key participates in the task hash, so changing them does not
  // invalidate the cache.
  "cacheMaxAge": "7d",
  "cacheMaxSize": "40GB",
  "tasks": {
    "transit": {
      "dependsOn": ["^transit"],
      "outputs": []
    },
    "build": {
      "dependsOn": ["^build"],
      "inputs": ["$TURBO_DEFAULT$", ".env*"],
      "outputs": [".next/**", "!.next/cache/**", "dist/**"]
    },
    "dev": {
      "persistent": true,
      "cache": false
    },
    "start": {
      "cache": false
    },
    "test": {
      "dependsOn": ["^build"],
      "env": ["SIM_TEST_SHARD"],
      "outputs": []
    },
    "lint": {
      "dependsOn": ["transit"],
      "outputs": []
    },
    "format": {
      "outputs": []
    },
    "format:check": {
      "outputs": []
    },
    "lint:check": {
      "dependsOn": ["transit"],
      "outputs": []
    },
    "type-check": {
      "dependsOn": ["transit"],
      "outputs": []
    }
  }
}