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eslint.config.js
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eslint.config.js
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// @ts-check
import eslintJS from "@eslint/js";
import eslintConfigPrettier from "eslint-config-prettier";
import * as importPlugin from "eslint-plugin-import";
import nodePlugin from "eslint-plugin-node";
import vitestPlugin from "eslint-plugin-vitest";
import globals from "globals";
import tsEslint from "typescript-eslint";
/** @type { import("eslint").Linter.FlatConfig } */
export default [
////////////////////////////////////////////////////////////////
// ALL FILES
{
files: ["src/**/*.ts", "./*.[tj]s", "__mocks__/**/*.ts"],
ignores: ["src/**/__codegen__/**/*"], // don't lint generated code
linterOptions: {
reportUnusedDisableDirectives: true,
},
languageOptions: {
globals: globals.node,
ecmaVersion: "latest",
sourceType: "module",
parser: tsEslint.parser,
parserOptions: {
project: "./tsconfig.json",
ecmaVersion: "latest",
sourceType: "module",
ecmaFeatures: {
globalReturn: false,
},
},
},
plugins: {
"@typescript-eslint": tsEslint.plugin,
import: importPlugin,
node: nodePlugin,
},
rules: {
// MERGE PRESETS:
...eslintJS.configs.recommended.rules,
...importPlugin.configs.recommended.rules,
...importPlugin.configs["typescript"].rules,
...nodePlugin.configs.recommended.rules,
...tsEslint.configs.eslintRecommended.rules, // turns off base eslint rules covered by ts-eslint
...[
...tsEslint.configs.strictTypeChecked,
...tsEslint.configs.stylisticTypeChecked, // prettier-ignore
].reduce((acc, { rules = {} }) => ({ ...acc, ...rules }), {}),
// RULE CUSTOMIZATIONS:
"default-case": "error", // switch-case statements must have a default case
"default-case-last": "error", // switch-case statements' default case must be last
eqeqeq: ["error", "always"],
"no-console": "warn",
"prefer-const": ["warn", { destructuring: "all" }],
"prefer-object-has-own": "error",
"prefer-promise-reject-errors": "error",
semi: ["error", "always"],
"import/named": "off", // TS performs this check
"import/namespace": "off", // TS performs this check
"import/default": "off", // TS performs this check
"import/no-named-as-default": "off", // TS performs this check
"import/no-named-as-default-member": "off", // TS performs this check
"node/no-missing-import": "off", // Does not work with path aliases
"node/no-process-env": "error",
"node/no-unpublished-import": ["error", { allowModules: ["type-fest"] }],
"node/no-unsupported-features/es-syntax": "off", // Allow dynamic import (no config option)
"@typescript-eslint/array-type": "off", // Allow "T[]" and "Array<T>"
"@typescript-eslint/consistent-indexed-object-style": "off", // Allow "Record<K, V>" and "{ [key: K]: V }"
"@typescript-eslint/consistent-type-definitions": "off", // Allow "type" and "interface", there are subtle usage differences
"@typescript-eslint/no-confusing-void-expression": "off", // Allow 1-line arrow fns to return void for readability
"@typescript-eslint/no-explicit-any": ["error", { ignoreRestArgs: true }],
"@typescript-eslint/no-extraneous-class": ["error", { allowStaticOnly: true }],
"@typescript-eslint/no-inferrable-types": "off",
"@typescript-eslint/no-misused-promises": [
"error",
{ checksVoidReturn: { arguments: false } },
],
"@typescript-eslint/no-non-null-assertion": "off",
"@typescript-eslint/no-unnecessary-boolean-literal-compare": "off", // Allow "if (x === true)"
"@typescript-eslint/no-unused-vars": [
"warn",
{
args: "after-used",
argsIgnorePattern: "^_",
vars: "all",
varsIgnorePattern: "^_",
destructuredArrayIgnorePattern: "^_",
ignoreRestSiblings: false,
},
],
"@typescript-eslint/prefer-for-of": "off",
"@typescript-eslint/prefer-nullish-coalescing": [
"error",
{
ignoreConditionalTests: true,
ignorePrimitives: { string: true },
},
],
"@typescript-eslint/restrict-template-expressions": [
"error",
{
allowAny: false,
allowNever: false,
allowArray: true,
allowBoolean: true,
allowNullish: true,
allowNumber: true,
allowRegExp: true,
},
],
...eslintConfigPrettier.rules, // <-- must be last, removes rules that conflict with prettier
},
settings: {
"import/parsers": {
"@typescript-eslint/parser": [".ts"],
},
"import/resolver": {
node: true,
typescript: {
project: "./tsconfig.json",
},
},
},
},
////////////////////////////////////////////////////////////////
// TEST FILES
{
files: ["src/**/*.test.ts", "src/**/tests/**/*", "src/**/__mocks__/**/*", "__mocks__/**/*"],
languageOptions: {
globals: {
...vitestPlugin.environments.env.globals,
},
},
plugins: {
vitest: vitestPlugin,
},
rules: {
...vitestPlugin.configs.recommended.rules,
"vitest/consistent-test-it": ["error", { fn: "test" }],
"vitest/no-disabled-tests": "warn",
"vitest/no-focused-tests": ["warn", { fixable: false }],
"vitest/prefer-lowercase-title": ["error", { ignore: ["describe"] }],
"vitest/prefer-to-be-truthy": "off",
"vitest/prefer-to-be-falsy": "off",
"vitest/valid-expect": "warn",
"node/no-unpublished-import": [
"error",
{ allowModules: ["type-fest", "vitest", "supertest", "@graphql-tools/mock"] },
],
"@typescript-eslint/no-confusing-void-expression": "off",
"@typescript-eslint/no-explicit-any": "off",
"@typescript-eslint/no-unsafe-argument": "off",
"@typescript-eslint/no-unsafe-assignment": "off",
"@typescript-eslint/no-unsafe-member-access": "off",
},
},
////////////////////////////////////////////////////////////////
// NON-TEST FILES
{
files: ["src/**/*"],
ignores: ["src/**/*.test.ts", "src/**/tests/**/*", "src/**/__mocks__/**/*", "__mocks__/**/*"],
rules: {
"no-restricted-imports": [
"warn",
{
patterns: [
{
group: ["@/tests/*"],
message:
"Test-related exports like mocks should only be imported in test-related files. " +
"If this file is part of a test suite, please rename it to match the pattern *.test.*",
},
],
},
],
},
},
////////////////////////////////////////////////////////////////
];