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fix(backend): add and configure ESLint for backend workspace #150

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901fe21
chore(backend): add and configure ESLint for backend workspace
Harxhit May 18, 2026
795179f
fix(backend): align Prisma versions
Harxhit May 18, 2026
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202 changes: 202 additions & 0 deletions apps/backend/eslint.config.js
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Original file line number Diff line number Diff line change
@@ -0,0 +1,202 @@
import tseslint from 'typescript-eslint';
import pluginN from 'eslint-plugin-n';
import pluginImportX from 'eslint-plugin-import-x';
import pluginPromise from 'eslint-plugin-promise';
import pluginSecurity from 'eslint-plugin-security';
import pluginUnicorn from 'eslint-plugin-unicorn';

export default tseslint.config(

// ─── Global Ignores ──────────────────────────────────────────────────────────
{
ignores: [
'dist/**',
'build/**',
'node_modules/**',
'coverage/**',
'prisma/migrations/**',
'**/*.d.ts',
],
},

// ─── Base: ESLint Recommended + TypeScript ──────────────────────────────────
...tseslint.configs.recommendedTypeChecked,

// ─── Main Config ────────────────────────────────────────────────────────────
{
files: ['src/**/*.ts'],

languageOptions: {
parserOptions: {
projectService: true,
tsconfigRootDir: import.meta.dirname,
},
},

plugins: {
n: pluginN,
'import-x': pluginImportX,
promise: pluginPromise,
security: pluginSecurity,
unicorn: pluginUnicorn,
},

settings: {
'import-x/resolver': {
typescript: { project: './tsconfig.json' },
node: true,
},
node: { version: '>=18.0.0' },
},

rules: {

// ── TypeScript: Type Safety ─────────────────────────────────────────────
'@typescript-eslint/no-explicit-any': 'off',
'@typescript-eslint/no-unsafe-argument': 'off',
'@typescript-eslint/no-unsafe-assignment': 'off',
'@typescript-eslint/no-unsafe-call': 'off',
'@typescript-eslint/no-unsafe-member-access': 'off',
'@typescript-eslint/no-unsafe-return': 'off',
'@typescript-eslint/no-non-null-assertion': 'off',
'@typescript-eslint/no-unnecessary-type-assertion': 'off',
'@typescript-eslint/prefer-nullish-coalescing': 'off',
'@typescript-eslint/prefer-optional-chain': 'off',
'@typescript-eslint/strict-boolean-expressions': 'off',

// ── TypeScript: Async / Promises ────────────────────────────────────────
'@typescript-eslint/no-floating-promises': 'off',
'@typescript-eslint/no-misused-promises': 'off',
'@typescript-eslint/await-thenable': 'off',
'@typescript-eslint/require-await': 'off',
'@typescript-eslint/return-await': 'off',

// ── TypeScript: Imports ─────────────────────────────────────────────────
'@typescript-eslint/consistent-type-imports': [
'error',
{ prefer: 'type-imports', fixStyle: 'inline-type-imports' },
],
'@typescript-eslint/consistent-type-exports': 'error',
'@typescript-eslint/no-import-type-side-effects': 'error',

// ── TypeScript: Code Quality ────────────────────────────────────────────
'@typescript-eslint/no-unused-vars': [
'error',
{
argsIgnorePattern: '^_',
varsIgnorePattern: '^_',
caughtErrorsIgnorePattern: '^_',
},
],
'@typescript-eslint/explicit-function-return-type': [
'warn',
{
allowExpressions: true,
allowTypedFunctionExpressions: true,
},
],
'@typescript-eslint/prefer-as-const': 'error',
'@typescript-eslint/no-redundant-type-constituents': 'warn',
'@typescript-eslint/no-shadow': 'error',
'@typescript-eslint/no-use-before-define': ['error', { functions: false }],

// ── Node.js ─────────────────────────────────────────────────────────────
'n/no-deprecated-api': 'error',
'n/no-extraneous-import': 'error',
'n/no-process-exit': 'off',
'n/prefer-global/buffer': ['error', 'always'],
'n/prefer-global/process': ['error', 'always'],
'n/prefer-promises/fs': 'error',
'n/prefer-promises/dns': 'error',
'n/no-sync': 'warn',

// ── Imports (import-x) ──────────────────────────────────────────────────
'import-x/no-duplicates': 'error',
'import-x/no-cycle': 'off',
'import-x/no-self-import': 'error',
'import-x/first': 'error',
'import-x/newline-after-import': 'error',
'import-x/order': [
'error',
{
groups: ['builtin', 'external', 'internal', 'parent', 'sibling', 'index', 'type'],
'newlines-between': 'always',
alphabetize: { order: 'asc', caseInsensitive: true },
},
],

// ── Promises ────────────────────────────────────────────────────────────
'promise/always-return': 'off',
'promise/catch-or-return': 'off',
'promise/no-new-statics': 'error',
'promise/no-return-wrap': 'error',
'promise/param-names': 'error',
'promise/no-promise-in-callback': 'warn',

// ── Security ────────────────────────────────────────────────────────────
'security/detect-object-injection': 'off',
'security/detect-non-literal-regexp': 'warn',
'security/detect-non-literal-fs-filename': 'warn',
'security/detect-eval-with-expression': 'error',
'security/detect-child-process': 'warn',
'security/detect-possible-timing-attacks': 'warn',

// ── Unicorn ─────────────────────────────────────────────────────────────
'unicorn/prefer-node-protocol': 'error',
'unicorn/no-process-exit': 'off',
'unicorn/error-message': 'off',
'unicorn/throw-new-error': 'off',
'unicorn/no-useless-undefined': 'off',
'unicorn/prefer-string-slice': 'warn',
'unicorn/no-for-loop': 'off',
'unicorn/prefer-includes': 'warn',
'unicorn/no-array-for-each': 'off',
'unicorn/prefer-ternary': 'off',
'unicorn/prevent-abbreviations': 'off',

// ── Core ESLint ─────────────────────────────────────────────────────────
'no-console': 'warn',
'eqeqeq': ['error', 'always'],
'no-var': 'error',
'prefer-const': 'error',
'no-throw-literal': 'error',
'curly': ['error', 'all'],
'object-shorthand': 'error',
'no-lonely-if': 'warn',
'no-nested-ternary': 'off',
'prefer-rest-params': 'error',
'prefer-spread': 'error',
'no-param-reassign': [
'error',
{
props: true,
ignorePropertyModificationsFor: ['acc', 'request', 'reply'],
},
],
},
},

// ─── Test File Overrides ────────────────────────────────────────────────────
{
files: ['**/*.test.ts', '**/*.spec.ts', 'src/__tests__/**/*.ts'],
rules: {
'@typescript-eslint/no-explicit-any': 'off',
'@typescript-eslint/no-unsafe-assignment': 'off',
'@typescript-eslint/no-unsafe-member-access': 'off',
'@typescript-eslint/no-non-null-assertion': 'off',
'@typescript-eslint/no-floating-promises': 'off',
'security/detect-object-injection': 'off',
'no-console': 'off',
},
},

// ─── Prisma Seed / Scripts Override ────────────────────────────────────────
{
files: ['prisma/**/*.ts', 'scripts/**/*.ts'],
rules: {
'n/no-process-exit': 'off',
'unicorn/no-process-exit': 'off',
'no-console': 'off',
},
},
);
11 changes: 10 additions & 1 deletion apps/backend/package.json
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,7 @@
"test": "vitest run",
"test:watch": "vitest",
"lint": "eslint src/",
"lint:fix": "eslint src/ --fix",
"db:migrate": "prisma migrate dev",
"db:deploy": "prisma migrate deploy",
"db:seed": "tsx prisma/seed.ts",
Expand All @@ -34,10 +35,18 @@
"devDependencies": {
"@types/node": "^22.0.0",
"@types/qrcode": "^1.5.0",
"eslint": "^10.4.0",
"eslint-import-resolver-typescript": "^4.4.4",
"eslint-plugin-import-x": "^4.16.2",
"eslint-plugin-n": "^18.0.1",
"eslint-plugin-promise": "^7.3.0",
"eslint-plugin-security": "^4.0.0",
"eslint-plugin-unicorn": "^64.0.0",
"pino-pretty": "^13.1.3",
"prisma": "^6.0.0",
"tsx": "^4.0.0",
"typescript": "^5.4.0",
"typescript-eslint": "^8.59.3",
"vitest": "^2.0.0"
}
}
}
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