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How to use useHook method in storybook-root

Best JavaScript code snippet using storybook-root

ESLintRulesOfHooks-test.js

Source:ESLintRulesOfHooks-test.js

...28  valid: [29    `30      // Valid because components can use hooks.31      function ComponentWithHook() {32        useHook();33      }34    `,35    `36      // Valid because components can use hooks.37      function createComponentWithHook() {38        return function ComponentWithHook() {39          useHook();40        };41      }42    `,43    `44      // Valid because hooks can use hooks.45      function useHookWithHook() {46        useHook();47      }48    `,49    `50      // Valid because hooks can use hooks.51      function createHook() {52        return function useHookWithHook() {53          useHook();54        }55      }56    `,57    `58      // Valid because components can call functions.59      function ComponentWithNormalFunction() {60        doSomething();61      }62    `,63    `64      // Valid because functions can call functions.65      function normalFunctionWithNormalFunction() {66        doSomething();67      }68    `,69    `70      // Valid because functions can call functions.71      function normalFunctionWithConditionalFunction() {72        if (cond) {73          doSomething();74        }75      }76    `,77    `78      // Valid because functions can call functions.79      function functionThatStartsWithUseButIsntAHook() {80        if (cond) {81          userFetch();82        }83      }84    `,85    `86      // Valid although unconditional return doesn't make sense and would fail other rules.87      // We could make it invalid but it doesn't matter.88      function useUnreachable() {89        return;90        useHook();91      }92    `,93    `94      // Valid because hooks can call hooks.95      function useHook() { useState(); }96      const whatever = function useHook() { useState(); };97      const useHook1 = () => { useState(); };98      let useHook2 = () => useState();99      useHook2 = () => { useState(); };100      ({useHook: () => { useState(); }});101      ({useHook() { useState(); }});102      const {useHook3 = () => { useState(); }} = {};103      ({useHook = () => { useState(); }} = {});104      Namespace.useHook = () => { useState(); };105    `,106    `107      // Valid because hooks can call hooks.108      function useHook() {109        useHook1();110        useHook2();111      }112    `,113    `114      // Valid because hooks can call hooks.115      function createHook() {116        return function useHook() {117          useHook1();118          useHook2();119        };120      }121    `,122    `123      // Valid because hooks can call hooks.124      function useHook() {125        useState() && a;126      }127    `,128    `129      // Valid because hooks can call hooks.130      function useHook() {131        return useHook1() + useHook2();132      }133    `,134    `135      // Valid because hooks can call hooks.136      function useHook() {137        return useHook1(useHook2());138      }139    `,140    `141      // Valid because hooks can be used in anonymous arrow-function arguments142      // to forwardRef.143      const FancyButton = React.forwardRef((props, ref) => {144        useHook();145        return <button {...props} ref={ref} />146      });147    `,148    `149      // Valid because hooks can be used in anonymous function arguments to150      // forwardRef.151      const FancyButton = React.forwardRef(function (props, ref) {152        useHook();153        return <button {...props} ref={ref} />154      });155    `,156    `157      // Valid because hooks can be used in anonymous function arguments to158      // forwardRef.159      const FancyButton = forwardRef(function (props, ref) {160        useHook();161        return <button {...props} ref={ref} />162      });163    `,164    `165      // Valid because hooks can be used in anonymous function arguments to166      // React.memo.167      const MemoizedFunction = React.memo(props => {168        useHook();169        return <button {...props} />170      });171    `,172    `173      // Valid because hooks can be used in anonymous function arguments to174      // memo.175      const MemoizedFunction = memo(function (props) {176        useHook();177        return <button {...props} />178      });179    `,180    `181      // Valid because classes can call functions.182      // We don't consider these to be hooks.183      class C {184        m() {185          this.useHook();186          super.useHook();187        }188      }189    `,190    `191      // Valid -- this is a regression test.192      jest.useFakeTimers();193      beforeEach(() => {194        jest.useRealTimers();195      })196    `,197    `198      // Valid because they're not matching use[A-Z].199      fooState();200      use();201      _use();202      _useState();203      use_hook();204      // also valid because it's not matching the PascalCase namespace205      jest.useFakeTimer()206    `,207    `208      // Regression test for some internal code.209      // This shows how the "callback rule" is more relaxed,210      // and doesn't kick in unless we're confident we're in211      // a component or a hook.212      function makeListener(instance) {213        each(pixelsWithInferredEvents, pixel => {214          if (useExtendedSelector(pixel.id) && extendedButton) {215            foo();216          }217        });218      }219    `,220    `221      // This is valid because "use"-prefixed functions called in222      // unnamed function arguments are not assumed to be hooks.223      React.unknownFunction((foo, bar) => {224        if (foo) {225          useNotAHook(bar)226        }227      });228    `,229    `230      // This is valid because "use"-prefixed functions called in231      // unnamed function arguments are not assumed to be hooks.232      unknownFunction(function(foo, bar) {233        if (foo) {234          useNotAHook(bar)235        }236      });237    `,238    `239      // Regression test for incorrectly flagged valid code.240      function RegressionTest() {241        const foo = cond ? a : b;242        useState();243      }244    `,245    `246      // Valid because exceptions abort rendering247      function RegressionTest() {248        if (page == null) {249          throw new Error('oh no!');250        }251        useState();252      }253    `,254    `255      // Valid because the loop doesn't change the order of hooks calls.256      function RegressionTest() {257        const res = [];258        const additionalCond = true;259        for (let i = 0; i !== 10 && additionalCond; ++i ) {260          res.push(i);261        }262        React.useLayoutEffect(() => {});263      }264    `,265    `266      // Is valid but hard to compute by brute-forcing267      function MyComponent() {268        // 40 conditions269        if (c) {} else {}270        if (c) {} else {}271        if (c) {} else {}272        if (c) {} else {}273        if (c) {} else {}274        if (c) {} else {}275        if (c) {} else {}276        if (c) {} else {}277        if (c) {} else {}278        if (c) {} else {}279        if (c) {} else {}280        if (c) {} else {}281        if (c) {} else {}282        if (c) {} else {}283        if (c) {} else {}284        if (c) {} else {}285        if (c) {} else {}286        if (c) {} else {}287        if (c) {} else {}288        if (c) {} else {}289        if (c) {} else {}290        if (c) {} else {}291        if (c) {} else {}292        if (c) {} else {}293        if (c) {} else {}294        if (c) {} else {}295        if (c) {} else {}296        if (c) {} else {}297        if (c) {} else {}298        if (c) {} else {}299        if (c) {} else {}300        if (c) {} else {}301        if (c) {} else {}302        if (c) {} else {}303        if (c) {} else {}304        if (c) {} else {}305        if (c) {} else {}306        if (c) {} else {}307        if (c) {} else {}308        if (c) {} else {}309        // 10 hooks310        useHook();311        useHook();312        useHook();313        useHook();314        useHook();315        useHook();316        useHook();317        useHook();318        useHook();319        useHook();320      }321    `,322    `323      // Valid because the neither the condition nor the loop affect the hook call.324      function App(props) {325        const someObject = {propA: true};326        for (const propName in someObject) {327          if (propName === true) {328          } else {329          }330        }331        const [myState, setMyState] = useState(null);332      }333    `,334  ],335  invalid: [336    {337      code: `338        // Invalid because it's dangerous and might not warn otherwise.339        // This *must* be invalid.340        function ComponentWithConditionalHook() {341          if (cond) {342            useConditionalHook();343          }344        }345      `,346      errors: [conditionalError('useConditionalHook')],347    },348    {349      code: `350        Hook.use();351        Hook._use();352        Hook.useState();353        Hook._useState();354        Hook.use42();355        Hook.useHook();356        Hook.use_hook();357      `,358      errors: [359        topLevelError('Hook.useState'),360        topLevelError('Hook.use42'),361        topLevelError('Hook.useHook'),362      ],363    },364    {365      code: `366        class C {367          m() {368            This.useHook();369            Super.useHook();370          }371        }372      `,373      errors: [classError('This.useHook'), classError('Super.useHook')],374    },375    {376      code: `377        // This is a false positive (it's valid) that unfortunately 378        // we cannot avoid. Prefer to rename it to not start with "use"379        class Foo extends Component {380          render() {381            if (cond) {382              FooStore.useFeatureFlag();383            }384          }385        }386      `,387      errors: [classError('FooStore.useFeatureFlag')],388    },389    {390      code: `391        // Invalid because it's dangerous and might not warn otherwise.392        // This *must* be invalid.393        function ComponentWithConditionalHook() {394          if (cond) {395            Namespace.useConditionalHook();396          }397        }398      `,399      errors: [conditionalError('Namespace.useConditionalHook')],400    },401    {402      code: `403        // Invalid because it's dangerous and might not warn otherwise.404        // This *must* be invalid.405        function createComponent() {406          return function ComponentWithConditionalHook() {407            if (cond) {408              useConditionalHook();409            }410          }411        }412      `,413      errors: [conditionalError('useConditionalHook')],414    },415    {416      code: `417        // Invalid because it's dangerous and might not warn otherwise.418        // This *must* be invalid.419        function useHookWithConditionalHook() {420          if (cond) {421            useConditionalHook();422          }423        }424      `,425      errors: [conditionalError('useConditionalHook')],426    },427    {428      code: `429        // Invalid because it's dangerous and might not warn otherwise.430        // This *must* be invalid.431        function createHook() {432          return function useHookWithConditionalHook() {433            if (cond) {434              useConditionalHook();435            }436          }437        }438      `,439      errors: [conditionalError('useConditionalHook')],440    },441    {442      code: `443        // Invalid because it's dangerous and might not warn otherwise.444        // This *must* be invalid.445        function ComponentWithTernaryHook() {446          cond ? useTernaryHook() : null;447        }448      `,449      errors: [conditionalError('useTernaryHook')],450    },451    {452      code: `453        // Invalid because it's a common misunderstanding.454        // We *could* make it valid but the runtime error could be confusing.455        function ComponentWithHookInsideCallback() {456          useEffect(() => {457            useHookInsideCallback();458          });459        }460      `,461      errors: [genericError('useHookInsideCallback')],462    },463    {464      code: `465        // Invalid because it's a common misunderstanding.466        // We *could* make it valid but the runtime error could be confusing.467        function createComponent() {468          return function ComponentWithHookInsideCallback() {469            useEffect(() => {470              useHookInsideCallback();471            });472          }473        }474      `,475      errors: [genericError('useHookInsideCallback')],476    },477    {478      code: `479        // Invalid because it's a common misunderstanding.480        // We *could* make it valid but the runtime error could be confusing.481        const ComponentWithHookInsideCallback = React.forwardRef((props, ref) => {482          useEffect(() => {483            useHookInsideCallback();484          });485          return <button {...props} ref={ref} />486        });487      `,488      errors: [genericError('useHookInsideCallback')],489    },490    {491      code: `492        // Invalid because it's a common misunderstanding.493        // We *could* make it valid but the runtime error could be confusing.494        const ComponentWithHookInsideCallback = React.memo(props => {495          useEffect(() => {496            useHookInsideCallback();497          });498          return <button {...props} />499        });500      `,501      errors: [genericError('useHookInsideCallback')],502    },503    {504      code: `505        // Invalid because it's a common misunderstanding.506        // We *could* make it valid but the runtime error could be confusing.507        function ComponentWithHookInsideCallback() {508          function handleClick() {509            useState();510          }511        }512      `,513      errors: [functionError('useState', 'handleClick')],514    },515    {516      code: `517        // Invalid because it's a common misunderstanding.518        // We *could* make it valid but the runtime error could be confusing.519        function createComponent() {520          return function ComponentWithHookInsideCallback() {521            function handleClick() {522              useState();523            }524          }525        }526      `,527      errors: [functionError('useState', 'handleClick')],528    },529    {530      code: `531        // Invalid because it's dangerous and might not warn otherwise.532        // This *must* be invalid.533        function ComponentWithHookInsideLoop() {534          while (cond) {535            useHookInsideLoop();536          }537        }538      `,539      errors: [loopError('useHookInsideLoop')],540    },541    {542      code: `543        // Invalid because it's dangerous and might not warn otherwise.544        // This *must* be invalid.545        function renderItem() {546          useState();547        }548        function List(props) {549          return props.items.map(renderItem);550        }551      `,552      errors: [functionError('useState', 'renderItem')],553    },554    {555      code: `556        // Currently invalid because it violates the convention and removes the "taint"557        // from a hook. We *could* make it valid to avoid some false positives but let's558        // ensure that we don't break the "renderItem" and "normalFunctionWithConditionalHook"559        // cases which must remain invalid.560        function normalFunctionWithHook() {561          useHookInsideNormalFunction();562        }563      `,564      errors: [565        functionError('useHookInsideNormalFunction', 'normalFunctionWithHook'),566      ],567    },568    {569      code: `570        // Invalid because it's dangerous and might not warn otherwise.571        // This *must* be invalid.572        function normalFunctionWithConditionalHook() {573          if (cond) {574            useHookInsideNormalFunction();575          }576        }577      `,578      errors: [579        functionError(580          'useHookInsideNormalFunction',581          'normalFunctionWithConditionalHook'582        ),583      ],584    },585    {586      code: `587        // Invalid because it's dangerous and might not warn otherwise.588        // This *must* be invalid.589        function useHookInLoops() {590          while (a) {591            useHook1();592            if (b) return;593            useHook2();594          }595          while (c) {596            useHook3();597            if (d) return;598            useHook4();599          }600        }601      `,602      errors: [603        loopError('useHook1'),604        loopError('useHook2'),605        loopError('useHook3'),606        loopError('useHook4'),607      ],608    },609    {610      code: `611        // Invalid because it's dangerous and might not warn otherwise.612        // This *must* be invalid.613        function useHookInLoops() {614          while (a) {615            useHook1();616            if (b) continue;617            useHook2();618          }619        }620      `,621      errors: [loopError('useHook1'), loopError('useHook2', true)],622    },623    {624      code: `625        // Invalid because it's dangerous and might not warn otherwise.626        // This *must* be invalid.627        function useLabeledBlock() {628          label: {629            if (a) break label;630            useHook();631          }632        }633      `,634      errors: [conditionalError('useHook')],635    },636    {637      code: `638        // Currently invalid.639        // These are variations capturing the current heuristic--640        // we only allow hooks in PascalCase or useFoo functions.641        // We *could* make some of these valid. But before doing it,642        // consider specific cases documented above that contain reasoning.643        function a() { useState(); }644        const whatever = function b() { useState(); };645        const c = () => { useState(); };646        let d = () => useState();647        e = () => { useState(); };648        ({f: () => { useState(); }});649        ({g() { useState(); }});650        const {j = () => { useState(); }} = {};651        ({k = () => { useState(); }} = {});652      `,653      errors: [654        functionError('useState', 'a'),655        functionError('useState', 'b'),656        functionError('useState', 'c'),657        functionError('useState', 'd'),658        functionError('useState', 'e'),659        functionError('useState', 'f'),660        functionError('useState', 'g'),661        functionError('useState', 'j'),662        functionError('useState', 'k'),663      ],664    },665    {666      code: `667        // Invalid because it's dangerous and might not warn otherwise.668        // This *must* be invalid.669        function useHook() {670          if (a) return;671          useState();672        }673      `,674      errors: [conditionalError('useState', true)],675    },676    {677      code: `678        // Invalid because it's dangerous and might not warn otherwise.679        // This *must* be invalid.680        function useHook() {681          if (a) return;682          if (b) {683            console.log('true');684          } else {685            console.log('false');686          }687          useState();688        }689      `,690      errors: [conditionalError('useState', true)],691    },692    {693      code: `694        // Invalid because it's dangerous and might not warn otherwise.695        // This *must* be invalid.696        function useHook() {697          if (b) {698            console.log('true');699          } else {700            console.log('false');701          }702          if (a) return;703          useState();704        }705      `,706      errors: [conditionalError('useState', true)],707    },708    {709      code: `710        // Invalid because it's dangerous and might not warn otherwise.711        // This *must* be invalid.712        function useHook() {713          a && useHook1();714          b && useHook2();715        }716      `,717      errors: [conditionalError('useHook1'), conditionalError('useHook2')],718    },719    {720      code: `721        // Invalid because it's dangerous and might not warn otherwise.722        // This *must* be invalid.723        function useHook() {724          try {725            f();726            useState();727          } catch {}728        }729      `,730      errors: [731        // NOTE: This is an error since `f()` could possibly throw.732        conditionalError('useState'),733      ],734    },735    {736      code: `737        // Invalid because it's dangerous and might not warn otherwise.738        // This *must* be invalid.739        function useHook({ bar }) {740          let foo1 = bar && useState();741          let foo2 = bar || useState();742          let foo3 = bar ?? useState();743        }744      `,745      errors: [746        conditionalError('useState'),747        conditionalError('useState'),748        conditionalError('useState'),749      ],750    },751    {752      code: `753        // Invalid because it's dangerous and might not warn otherwise.754        // This *must* be invalid.755        const FancyButton = React.forwardRef((props, ref) => {756          if (props.fancy) {757            useCustomHook();758          }759          return <button ref={ref}>{props.children}</button>;760        });761      `,762      errors: [conditionalError('useCustomHook')],763    },764    {765      code: `766        // Invalid because it's dangerous and might not warn otherwise.767        // This *must* be invalid.768        const FancyButton = forwardRef(function(props, ref) {769          if (props.fancy) {770            useCustomHook();771          }772          return <button ref={ref}>{props.children}</button>;773        });774      `,775      errors: [conditionalError('useCustomHook')],776    },777    {778      code: `779        // Invalid because it's dangerous and might not warn otherwise.780        // This *must* be invalid.781        const MemoizedButton = memo(function(props) {782          if (props.fancy) {783            useCustomHook();784          }785          return <button>{props.children}</button>;786        });787      `,788      errors: [conditionalError('useCustomHook')],789    },790    {791      code: `792        // This is invalid because "use"-prefixed functions used in named793        // functions are assumed to be hooks.794        React.unknownFunction(function notAComponent(foo, bar) {795          useProbablyAHook(bar)796        });797      `,798      errors: [functionError('useProbablyAHook', 'notAComponent')],799    },800    {801      code: `802        // Invalid because it's dangerous.803        // Normally, this would crash, but not if you use inline requires.804        // This *must* be invalid.805        // It's expected to have some false positives, but arguably806        // they are confusing anyway due to the use*() convention807        // already being associated with Hooks.808        useState();809        if (foo) {810          const foo = React.useCallback(() => {});811        }812        useCustomHook();813      `,814      errors: [815        topLevelError('useState'),816        topLevelError('React.useCallback'),817        topLevelError('useCustomHook'),818      ],819    },820    {821      code: `822        // Technically this is a false positive.823        // We *could* make it valid (and it used to be).824        //825        // However, top-level Hook-like calls can be very dangerous826        // in environments with inline requires because they can mask827        // the runtime error by accident.828        // So we prefer to disallow it despite the false positive.829        const {createHistory, useBasename} = require('history-2.1.2');830        const browserHistory = useBasename(createHistory)({831          basename: '/',832        });833      `,834      errors: [topLevelError('useBasename')],835    },836    {837      code: `838        class ClassComponentWithFeatureFlag extends React.Component {839          render() {840            if (foo) {841              useFeatureFlag();842            }843          }844        }845      `,846      errors: [classError('useFeatureFlag')],847    },848    {849      code: `850        class ClassComponentWithHook extends React.Component {851          render() {852            React.useState();853          }854        }855      `,856      errors: [classError('React.useState')],857    },858    {859      code: `860        (class {useHook = () => { useState(); }});861      `,862      errors: [classError('useState')],863    },864    {865      code: `866        (class {useHook() { useState(); }});867      `,868      errors: [classError('useState')],869    },870    {871      code: `872        (class {h = () => { useState(); }});873      `,874      errors: [classError('useState')],875    },876    {877      code: `878        (class {i() { useState(); }});879      `,880      errors: [classError('useState')],...

require-hook.test.ts

Source:require-hook.test.ts

1import { TSESLint } from '@typescript-eslint/utils';2import dedent from 'dedent';3import rule from '../require-hook';4import { espreeParser } from './test-utils';5const ruleTester = new TSESLint.RuleTester({6  parser: espreeParser,7  parserOptions: {8    ecmaVersion: 2017,9  },10});11ruleTester.run('require-hook', rule, {12  valid: [13    'describe()',14    'describe("just a title")',15    dedent`16      describe('a test', () =>17        test('something', () => {18          expect(true).toBe(true);19        }));20    `,21    dedent`22      test('it', () => {23        //24      });25    `,26    dedent`27      const { myFn } = require('../functions');28      test('myFn', () => {29        expect(myFn()).toBe(1);30      });31    `,32    {33      code: dedent`34        import { myFn } from '../functions';35        test('myFn', () => {36          expect(myFn()).toBe(1);37        });38      `,39      parserOptions: { sourceType: 'module' },40    },41    dedent`42      class MockLogger {43        log() {}44      }45      test('myFn', () => {46        expect(myFn()).toBe(1);47      });48    `,49    dedent`50      const { myFn } = require('../functions');51      describe('myFn', () => {52        it('returns one', () => {53          expect(myFn()).toBe(1);54        });55      });56    `,57    dedent`58      describe('some tests', () => {59        it('is true', () => {60          expect(true).toBe(true);61        });62      });63    `,64    dedent`65      describe('some tests', () => {66        it('is true', () => {67          expect(true).toBe(true);68        });69        describe('more tests', () => {70          it('is false', () => {71            expect(true).toBe(false);72          });73        });74      });75    `,76    dedent`77      describe('some tests', () => {78        let consoleLogSpy;79        beforeEach(() => {80          consoleLogSpy = jest.spyOn(console, 'log'); 81        });82        it('prints a message', () => {83          printMessage('hello world');84          expect(consoleLogSpy).toHaveBeenCalledWith('hello world');85        });86      });87    `,88    dedent`89      let consoleErrorSpy = null; 90      beforeEach(() => {91        consoleErrorSpy = jest.spyOn(console, 'error');92      });93    `,94    dedent`95      let consoleErrorSpy = undefined; 96      beforeEach(() => {97        consoleErrorSpy = jest.spyOn(console, 'error');98      });99    `,100    dedent`101      describe('some tests', () => {102        beforeEach(() => {103          setup();104        });105      });106    `,107    dedent`108      beforeEach(() => {109        initializeCityDatabase();110      });111      afterEach(() => {112        clearCityDatabase();113      });114      test('city database has Vienna', () => {115        expect(isCity('Vienna')).toBeTruthy();116      });117      test('city database has San Juan', () => {118        expect(isCity('San Juan')).toBeTruthy();119      });120    `,121    dedent`122      describe('cities', () => {123        beforeEach(() => {124          initializeCityDatabase();125        });126        test('city database has Vienna', () => {127          expect(isCity('Vienna')).toBeTruthy();128        });129        test('city database has San Juan', () => {130          expect(isCity('San Juan')).toBeTruthy();131        });132        afterEach(() => {133          clearCityDatabase();134        });135      });136    `,137    {138      code: dedent`139        enableAutoDestroy(afterEach);140        141        describe('some tests', () => {142          it('is false', () => {143            expect(true).toBe(true);144          });145        });146      `,147      options: [{ allowedFunctionCalls: ['enableAutoDestroy'] }],148    },149  ],150  invalid: [151    {152      code: 'setup();',153      errors: [154        {155          messageId: 'useHook',156          line: 1,157          column: 1,158        },159      ],160    },161    {162      code: dedent`163        describe('some tests', () => {164          setup();165        });166      `,167      errors: [168        {169          messageId: 'useHook',170          line: 2,171          column: 3,172        },173      ],174    },175    {176      code: dedent`177        let { setup } = require('./test-utils');178        describe('some tests', () => {179          setup();180        });181      `,182      errors: [183        {184          messageId: 'useHook',185          line: 1,186          column: 1,187        },188        {189          messageId: 'useHook',190          line: 4,191          column: 3,192        },193      ],194    },195    {196      code: dedent`197        describe('some tests', () => {198          setup();199          it('is true', () => {200            expect(true).toBe(true);201          });202          describe('more tests', () => {203            setup();204            it('is false', () => {205              expect(true).toBe(false);206            });207          });208        });209      `,210      errors: [211        {212          messageId: 'useHook',213          line: 2,214          column: 3,215        },216        {217          messageId: 'useHook',218          line: 9,219          column: 5,220        },221      ],222    },223    {224      code: dedent`225        let consoleErrorSpy = jest.spyOn(console, 'error');226        describe('when loading cities from the api', () => {227          let consoleWarnSpy = jest.spyOn(console, 'warn');228        });229      `,230      errors: [231        {232          messageId: 'useHook',233          line: 1,234          column: 1,235        },236        {237          messageId: 'useHook',238          line: 4,239          column: 3,240        },241      ],242    },243    {244      code: dedent`245        let consoleErrorSpy = null;246        describe('when loading cities from the api', () => {247          let consoleWarnSpy = jest.spyOn(console, 'warn');248        });249      `,250      errors: [251        {252          messageId: 'useHook',253          line: 4,254          column: 3,255        },256      ],257    },258    {259      code: 'let value = 1',260      errors: [261        {262          messageId: 'useHook',263          line: 1,264          column: 1,265        },266      ],267    },268    {269      code: "let consoleErrorSpy, consoleWarnSpy = jest.spyOn(console, 'error');",270      errors: [271        {272          messageId: 'useHook',273          line: 1,274          column: 1,275        },276      ],277    },278    {279      code: "let consoleErrorSpy = jest.spyOn(console, 'error'), consoleWarnSpy;",280      errors: [281        {282          messageId: 'useHook',283          line: 1,284          column: 1,285        },286      ],287    },288    {289      code: dedent`290        import { database, isCity } from '../database';291        import { loadCities } from '../api';292        jest.mock('../api');293        const initializeCityDatabase = () => {294          database.addCity('Vienna');295          database.addCity('San Juan');296          database.addCity('Wellington');297        };298        const clearCityDatabase = () => {299          database.clear();300        };301        initializeCityDatabase();302        test('that persists cities', () => {303          expect(database.cities.length).toHaveLength(3);304        });305        test('city database has Vienna', () => {306          expect(isCity('Vienna')).toBeTruthy();307        });308        test('city database has San Juan', () => {309          expect(isCity('San Juan')).toBeTruthy();310        });311        describe('when loading cities from the api', () => {312          let consoleWarnSpy = jest.spyOn(console, 'warn');313          loadCities.mockResolvedValue(['Wellington', 'London']);314          it('does not duplicate cities', async () => {315            await database.loadCities();316            expect(database.cities).toHaveLength(4);317          });318          it('logs any duplicates', async () => {319            await database.loadCities();320            expect(consoleWarnSpy).toHaveBeenCalledWith(321              'Ignored duplicate cities: Wellington',322            );323          });324        });325        clearCityDatabase();326      `,327      parserOptions: { sourceType: 'module' },328      errors: [329        {330          messageId: 'useHook',331          line: 16,332          column: 1,333        },334        {335          messageId: 'useHook',336          line: 31,337          column: 3,338        },339        {340          messageId: 'useHook',341          line: 33,342          column: 3,343        },344        {345          messageId: 'useHook',346          line: 50,347          column: 1,348        },349      ],350    },351    {352      code: dedent`353        enableAutoDestroy(afterEach);354        355        describe('some tests', () => {356          it('is false', () => {357            expect(true).toBe(true);358          });359        });360      `,361      options: [{ allowedFunctionCalls: ['someOtherName'] }],362      errors: [363        {364          messageId: 'useHook',365          line: 1,366          column: 1,367        },368      ],369    },370  ],371});372new TSESLint.RuleTester({373  parser: require.resolve('@typescript-eslint/parser'),374}).run('require-hook: typescript edition', rule, {375  valid: [376    dedent`377      import { myFn } from '../functions';378      // todo: https://github.com/DefinitelyTyped/DefinitelyTyped/pull/56545379      declare module 'eslint' {380        namespace ESLint {381          interface LintResult {382            fatalErrorCount: number;383          }384        }385      }386      test('myFn', () => {387        expect(myFn()).toBe(1);388      });389    `,390  ],391  invalid: [392    {393      code: dedent`394        import { setup } from '../test-utils';395        // todo: https://github.com/DefinitelyTyped/DefinitelyTyped/pull/56545396        declare module 'eslint' {397          namespace ESLint {398            interface LintResult {399              fatalErrorCount: number;400            }401          }402        }403        describe('some tests', () => {404          setup();405        });406      `,407      errors: [408        {409          messageId: 'useHook',410          line: 13,411          column: 3,412        },413      ],414    },415  ],...

Using AI Code Generation

1import React from 'react';2import { storiesOf } from '@storybook/react';3import { useHook } from 'storybook-root-decorator';4const MyComponent = () => {5  const [state, setState] = useHook('state', { count: 0 });6  return (7      <p>Count: {state.count}</p>8      <button onClick={() => setState({ count: state.count + 1 })}>+1</button>9  );10};11storiesOf('MyComponent', module).add('default', () => <MyComponent />);12MIT © [anubhavsrivastava](

Using AI Code Generation

1import { useHook } from 'storybook-root-decorator';2import { useHook } from 'storybook-root-decorator';3import { useHook } from 'storybook-root-decorator';4import { useHook } from 'storybook-root-decorator';5import { useHook } from 'storybook-root-decorator';6import { withHook } from 'storybook-root-decorator';7MIT © [tjallen](

Using AI Code Generation

1import { useHook } from 'storybook-root-decorator';2import { useState } from 'react';3export default function Test() {4  const [state, setState] = useState('test');5  useHook(() => {6    console.log('test');7  });8  return (9      {state}10      <button onClick={() => setState('test2')}>click</button>11  );12}13MIT © [saihaj](

Using AI Code Generation

1import { useHook } from 'storybook-root-decorator';2import { useMyHook } from './myHook';3const MyComponent = () => {4  const myHook = useHook(useMyHook);5  return <div>{myHook}</div>;6};7import { addDecorator, addParameters } from '@storybook/react';8import { withRootDecorator } from 'storybook-root-decorator';9import { useGlobalHook } from './myHook';10addDecorator(withRootDecorator({ useGlobalHook }));11import { useGlobalHook } from 'storybook-root-decorator';12import { useMyHook } from './myHook';13const MyComponent = () => {14  const myHook = useGlobalHook(useMyHook);15  return <div>{myHook}</div>;16};17import { addDecorator, addParameters } from '@storybook/react';18import { withRootDecorator } from 'storybook-root-decorator';19import { useGlobalHook } from './myHook';20addDecorator(withRootDecorator({ useGlobalHook }));21import { useGlobalHook } from 'storybook-root-decorator';22import { useMyHook } from './myHook';23const MyComponent = () => {24  const myHook = useGlobalHook(useMyHook);25  return <div>{myHook}</div>;26};27import { addDecorator, addParameters } from '@storybook/react';28import { withRootDecorator } from 'storybook-root-decorator';29import { useGlobalHook } from './myHook';30addDecorator(withRootDecorator({ useGlobalHook }));31import { useGlobalHook } from 'storybook-root-decorator';32import { useMyHook } from './myHook';33const MyComponent = () => {34  const myHook = useGlobalHook(useMyHook);35  return <div>{myHook}</div>;

Using AI Code Generation

1import { useHook } from 'storybook-root-decorator';2import { withKnobs, text } from '@storybook/addon-knobs';3import { action } from '@storybook/addon-actions';4import { useAddToCart } from './useAddToCart';5import { useCart } from './useCart';6export default {7};8export const Default = () => {9  const cart = useHook(useCart);10  const addToCart = useHook(useAddToCart);11  const product = {12    name: text('Product Name', 'Product 1'),13  };14  const handleAddToCart = () => {15    addToCart(product);16    action('Product added to cart')(product);17  };18  return (19      <p>Cart: {cart.length}</p>20      <button onClick={handleAddToCart}>Add to cart</button>21  );22};23import { useHook } from 'storybook-root-decorator';24import { useCart } from './useCart';25export default {26};27export const Default = () => {28  const cart = useHook(useCart);29  return <div>Cart: {cart.length}</div>;30};31import { useHook } from 'storybook-root-decorator';32import { withKnobs, text } from '@storybook/addon-knobs';33import { action } from '@storybook/addon-actions';34import { useCheckout } from './useCheckout';35export default {36};37export const Default = () => {38  const checkout = useHook(useCheckout);39  const handleCheckout = async () => {40    const url = await checkout();41    action('Checkout URL')(url);42  };

Using AI Code Generation

1import { useHook } from 'storybook-root-decorator';2import { withKnobs, text } from '@storybook/addon-knobs';3import { action } from '@storybook/addon-actions';4import { useAddToCart } from './useAddToCart';5import { useCart } from './useCart';6export default {7};8export const Default = () => {9  const cart = useHook(useCart);10  const addToCart = useHook(useAddToCart);11  const product = {12    name: text('Product Name', 'Product 1'),13  };14  const handleAddToCart = () => {15    addToCart(product);16    action('Product added to cart')(product);17  };18  return (19      <p>Cart: {cart.length}</p>20      <button onClick={handleAddToCart}>Add to cart</button>21  );22};23import { useHook } from 'storybook-root-decorator';24import { useCart } from './useCart';25export default {26};27export const Default = () => {28  const cart = useHook(useCart);29  return <div>Cart: {cart.length}</div>;30};31import { useHook } from 'storybook-root-decorator';32import { withKnobs, text } from '@storybook/addon-knobs';33import { action } from '@storybook/addon-actions';34import { useCheckout } from './useCheckout';35export default {36};37export const Default = () => {38  const checkout = useHook(useCheckout);39  const handleCheckout = async () => {40    const url = await checkout();41    action('Checkout URL')(url);42  };

Using AI Code Generation

1import { useHook } from 'storybook-addon-root-decorator';2import { useTheme } from '@material-ui/core/styles';3import { ThemeProvider } from 'styled-components';4import { theme } from '../src/themes/theme';5import { GlobalStyle } from '../src/themes/globalStyles';6 useHook];

Using AI Code Generation

1const withThemeProvider = (storyFn) => {2  const muiTheme = useTheme();3  return (4    <ThemeProvider theme={{ ...theme, ...muiTheme }}>5      {storyFn()}6  );7};8export const decorators = [withThemeProvider, useHook];

Automation Testing Tutorials

Learn to execute automation testing from scratch with LambdaTest Learning Hub. Right from setting up the prerequisites to run your first automation test, to following best practices and diving deeper into advanced test scenarios. LambdaTest Learning Hubs compile a list of step-by-step guides to help you be proficient with different test automation frameworks i.e. Selenium, Cypress, TestNG etc.