prefer-use-state-lazy-initialization.js

/**
 * @fileoverview Detects function calls in useState and suggests using lazy initialization instead.
 * @author Patrick Gillespie
 */

'use strict';

//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------

const RuleTester = require('eslint').RuleTester;
const rule = require('../../../lib/rules/prefer-use-state-lazy-initialization');

//------------------------------------------------------------------------------
// Tests
//------------------------------------------------------------------------------

const ruleTester = new RuleTester();
ruleTester.run('prefer-use-state-lazy-initialization', rule, {
  valid: [
    // give me some code that won't trigger a warning
    'useState()',
    'useState("")',
    'useState(true)',
    'useState(false)',
    'useState(null)',
    'useState(undefined)',
    'useState(1)',
    'useState("test")',
    'useState(value)',
    'useState(object.value)',
    'useState(1 || 2)',
    'useState(1 || 2 || 3 < 4)',
    'useState(1 && 2)',
    'useState(1 < 2)',
    'useState(1 < 2 ? 3 : 4)',
    'useState(1 == 2 ? 3 : 4)',
    'useState(1 === 2 ? 3 : 4)',
  ],

  invalid: [
    {
      code: 'useState(1 || getValue())',
      errors: [
        {
          message: rule.meta.messages.useLazyInitialization,
          type: 'CallExpression',
        },
      ],
    },
    {
      code: 'useState(2 < getValue())',
      errors: [
        {
          message: rule.meta.messages.useLazyInitialization,
          type: 'CallExpression',
        },
      ],
    },
    {
      code: 'useState(getValue())',
      errors: [
        {
          message: rule.meta.messages.useLazyInitialization,
          type: 'CallExpression',
        },
      ],
    },
    {
      code: 'useState(getValue(1, 2, 3))',
      errors: [
        {
          message: rule.meta.messages.useLazyInitialization,
          type: 'CallExpression',
        },
      ],
    },
    {
      code: 'useState(a ? b : c())',
      errors: [
        {
          message: rule.meta.messages.useLazyInitialization,
          type: 'CallExpression',
        },
      ],
    },
    {
      code: 'useState(a() ? b : c)',
      errors: [
        {
          message: rule.meta.messages.useLazyInitialization,
          type: 'CallExpression',
        },
      ],
    },
    {
      code: 'useState(a ? (b ? b1() : b2) : c)',
      errors: [
        {
          message: rule.meta.messages.useLazyInitialization,
          type: 'CallExpression',
        },
      ],
    },
    {
      code: 'useState(a() && b)',
      errors: [
        {
          message: rule.meta.messages.useLazyInitialization,
          type: 'CallExpression',
        },
      ],
    },
    {
      code: 'useState(a && b())',
      errors: [
        {
          message: rule.meta.messages.useLazyInitialization,
          type: 'CallExpression',
        },
      ],
    },
    {
      code: 'useState(a() && b())',
      errors: [
        {
          message: rule.meta.messages.useLazyInitialization,
          type: 'CallExpression',
        },
      ],
    },
  ],
});