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Update nextjs monorepo to v16 #620

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Update nextjs monorepo to v16 #620

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2 changes: 1 addition & 1 deletion package.json
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Original file line number Diff line number Diff line change
Expand Up @@ -26,7 +26,7 @@
"@typescript-eslint/eslint-plugin": "^8.60.1",
"@typescript-eslint/parser": "^8.60.1",
"eslint": "^8.57.1",
"eslint-config-next": "^15.5.19",
"eslint-config-next": "^16.0.0",

@devin-ai-integration devin-ai-integration Bot Feb 21, 2026

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🔴 eslint-config-next v16 requires ESLint >=9.0.0 but project pins ESLint ^8.56.0

Upgrading eslint-config-next from ^15.0.0 to ^16.0.0 introduces an unmet peer dependency. All versions of eslint-config-next@16.x require eslint >= 9.0.0, but the project specifies "eslint": "^8.56.0" which resolves to 8.57.1 in the lockfile.

Peer dependency mismatch details

The npm info output confirms every eslint-config-next@16.x release declares { eslint: '>=9.0.0' } as a peer dependency. The project's package.json:28 specifies "eslint": "^8.56.0" and the lockfile confirms it resolves to 8.57.1.

This mismatch can cause:

  • pnpm install warnings or errors about unmet peer dependencies (depending on pnpm strictness settings)
  • Runtime lint failures or unexpected behavior since eslint-config-next@16 is designed for ESLint 9's flat config system, which is fundamentally different from ESLint 8's .eslintrc-based configuration
  • The project has no ESLint config files (no .eslintrc* or eslint.config.* found), so the actual linting setup may already be broken or unused at the root level

Impact: The lint script (turbo lint) may fail or produce incorrect results when eslint-config-next@16 is loaded with ESLint 8.

Prompt for agents 
In package.json, the eslint-config-next dependency was bumped to ^16.0.0 which requires eslint >=9.0.0, but the eslint dependency on line 28 is still ^8.56.0. Either:
1. Revert eslint-config-next back to ^15.0.0 (line 29), OR
2. Upgrade eslint from ^8.56.0 to ^9.0.0 (line 28) AND migrate the ESLint configuration to ESLint 9's flat config format (eslint.config.js/eslint.config.mjs). Also check that all other eslint plugins and configs (eslint-config-standard, eslint-config-turbo, eslint-plugin-import, etc.) are compatible with ESLint 9.
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@devin-ai-integration devin-ai-integration Bot Jun 10, 2026

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🚩 Peer dependency mismatch: eslint-config-next v16 requires ESLint >=9 but repo uses ESLint 8

eslint-config-next@16.2.4 declares peerDependencies: { eslint: '>=9.0.0' } (visible in pnpm-lock.yaml), but the repo specifies "eslint": "^8.56.0" (resolved to 8.57.1). pnpm allows this with a warning since strict-peer-dependencies is not enabled in .npmrc, and the lockfile shows it resolves and installs. However, eslint-config-next v16 may use ESLint 9+ flat config APIs or other features not present in ESLint 8. If linting is currently passing in CI, this may be fine in practice, but it's an unsupported configuration that could break with future patch releases of eslint-config-next.

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"eslint-config-prettier": "^10.1.8",
"eslint-config-standard": "^17.1.0",
"eslint-config-turbo": "^2.9.16",
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