NestJS v10 -> v11

To upgrade Nest from v10 to v11, please refer to the previous document for the basic part, related to updating Node and Nest, and installing/executing ncu. In this case, update everything.

The steps specific to this version update are as follows:

• Add the following dependencies:

yarn add -D @eslint/eslintrc @eslint/js @swc/cli @swc/core globals typescript-eslint

• Remove the following ones:

yarn remove @typescript-eslint/eslint-plugin @typescript-eslint/parser

• In tsconfig.json, enable the following options:

  • strictNullChecks

  • forceConsistentCasingInFileNames

• The ESLint file is now eslint.config.mjs, and has the following base template:

// @ts-check
import eslint from '@eslint/js';
import eslintPluginPrettierRecommended from 'eslint-plugin-prettier/recommended';
import globals from 'globals';
import tseslint from 'typescript-eslint';

export default tseslint.config(
  {
    ignores: ['eslint.config.mjs'],
  },
  eslint.configs.recommended,
  ...tseslint.configs.recommendedTypeChecked,
  eslintPluginPrettierRecommended,
  {
    languageOptions: {
      globals: {
        ...globals.node,
        ...globals.jest,
      },
      ecmaVersion: 5,
      sourceType: 'module',
      parserOptions: {
        projectService: true,
        tsconfigRootDir: import.meta.dirname,
      },
    },
  },
  {
    rules: {
      '@typescript-eslint/no-explicit-any': 'off',
      '@typescript-eslint/no-floating-promises': 'warn',
      '@typescript-eslint/no-unsafe-argument': 'warn'
    },
  },
);

• In the e2e test file, use App as type parameter for app and as type for server

• In the main file, prefix the bootstrap() call with void to explicitly not await it

With this, the project is updated. However, I'll make some more changes related to type safety strictness, as to make it more flexible:

• In tsconfig.json, disable strictNullChecks

• In esling.config.mjs, in rules, disable the following options (mainly related to any handling):

'@typescript-eslint/no-unsafe-assignment': 'off',
'@typescript-eslint/no-unsafe-argument': 'off',
'@typescript-eslint/no-unsafe-call': 'off',
'@typescript-eslint/no-unsafe-member-access': 'off',
'@typescript-eslint/no-unsafe-return': 'off',
'no-case-declarations': 'off',

This prevents errors in several parts of the system.

Commit - Upgrading from NestJS v10 to v11