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module.exports = {

root: true,

parser: '@typescript-eslint/parser',

ignorePatterns: [

// Don't lint already-built outputs.

"dist",

// Don't lint the NPM package directory.

"node_modules",

// Uncomment to skip linting of external sources.

/* "flow_generated/external" */

parserOptions: {

tsconfigRootDir: __dirname,

project: ['./tsconfig.json'],

plugins: ['@typescript-eslint'],

extends: [

// Core eslint recommendations.

'eslint:recommended',

// Disable eslint:recommend rules covered by the typescript linter plugin.

'plugin:@typescript-eslint/eslint-recommended',

// Enable recommend typescript rules.

'plugin:@typescript-eslint/recommended',

// Enable recommend typescript rules which require type information from `tsc`.

'plugin:@typescript-eslint/recommended-requiring-type-checking',

// Disable rules from @typescript-eslint/eslint-plugin that conflict with prettier

'prettier/@typescript-eslint',

// Enable eslint-plugin-prettier and eslint-config-prettier.

// This will display prettier errors as ESLint errors.

// This must be last configuration in the extends array.

'plugin:prettier/recommended'

// Opt-in to several additional rules.

rules: {

// Disable camel-case linting, as identifier names are often drawn from JSON-Schemas

// which are outside of the author's control.

"@typescript-eslint/camelcase": "off",

// Allow variables prefixed with underscore to be unused.

"@typescript-eslint/no-unused-vars": ["error", { "argsIgnorePattern": "^_.*" }],

// Flow lambdas always return promises, but not all implementations need to be async.

"@typescript-eslint/require-await": "off",

// Require that created promises are used (await'd), and not silently dropped.

"@typescript-eslint/no-floating-promises": "error",

// Disallow uses of foo?.bar! (it's not possible to know that bar exists, since foo may not).

"@typescript-eslint/no-non-null-asserted-optional-chain": "error",

// Require functions returning Promise to be async. This avoids needing to handle a non-async

// function which can technically throw an Error *OR* return a rejected Promise. With this

// lint, a function can throw (if non-async) or reject (if async) but never both.

"@typescript-eslint/promise-function-async": "error",

// When adding two operands, each must be of type string or number, and cannot mix.

"@typescript-eslint/restrict-plus-operands": ["error", { "checkCompoundAssignments": true }],

// Switches over enum types should check all cases (or use explicit "default").

"@typescript-eslint/switch-exhaustiveness-check": "error",

// Warn on superfluous checks of boolean types against boolean literals (if (foo: bool === true) {}).

"@typescript-eslint/no-unnecessary-boolean-literal-compare": "warn",

// Warn on conditionals which are always truthy or falsy.

"@typescript-eslint/no-unnecessary-condition": "warn",

// Warn on "for (let i = 0; i != arr.length; i++)" syntax instead of for-of "for(const i in arr)".

"@typescript-eslint/prefer-for-of": "warn",

};