{"id":67660,"date":"2024-04-04T08:14:52","date_gmt":"2024-04-04T11:14:52","guid":{"rendered":"https:\/\/kinqsta.com\/pt\/?p=67660&#038;post_type=knowledgebase&#038;preview_id=67660"},"modified":"2025-10-01T17:00:30","modified_gmt":"2025-10-01T20:00:30","slug":"react-hook-useeffect-has-a-missing-dependency","status":"publish","type":"post","link":"https:\/\/kinqsta.com\/pt\/blog\/react-hook-useeffect-has-a-missing-dependency\/","title":{"rendered":"Como Corrigir o Erro \u201cReact Hook useEffect Has a Missing Dependency\u201d"},"content":{"rendered":"<p>O hook <code>useEffect<\/code> do <a href=\"https:\/\/kinqsta.com\/pt\/blog\/o-que-e-react-js\/\">React<\/a> se tornou um recurso popular na <a href=\"https:\/\/kinqsta.com\/pt\/blog\/bibliotecas-de-componentes-react\/\">biblioteca React<\/a> desde sua introdu\u00e7\u00e3o na vers\u00e3o 16.8. Ele permite que os desenvolvedores executem efeitos colaterais, como <a href=\"https:\/\/kinqsta.com\/pt\/blog\/graphql-vs-rest\/\">buscar dados<\/a>, atualizar o DOM e assinar eventos dentro de componentes funcionais.<\/p>\n<p>No entanto, o hook <code>useEffect<\/code> pode ser complicado de usar \u00e0s vezes. Um erro comum que os desenvolvedores encontram \u00e9 o &#8220;React hook useEffect has a missing dependency&#8221;.<\/p>\n<p>Neste artigo, discutiremos as causas desse erro e forneceremos v\u00e1rias solu\u00e7\u00f5es para corrigi-lo.<br \/>\n<div><\/div><kinsta-auto-toc heading=\"Table of Contents\" exclude=\"last\" list-style=\"arrow\" selector=\"h2\" count-number=\"-1\"><\/kinsta-auto-toc><\/p>\n<h2>O que causa o erro &#8220;React hook useEffect has a missing dependency&#8221;?<\/h2>\n<p>O erro &#8220;React hook useEffect has a missing dependency&#8221; ocorre quando o hook <code>useEffect<\/code> tem uma array de depend\u00eancias incompleta ou ausente.<\/p>\n<p>A array de depend\u00eancia \u00e9 o segundo argumento do hook <code>useEffect<\/code> e \u00e9 usada para especificar as vari\u00e1veis das quais o efeito depende. Isso significa que quando qualquer um dos valores das vari\u00e1veis especificadas na array de depend\u00eancia \u00e9 alterado, o efeito \u00e9 reexecutado.<\/p>\n<p>Em uma situa\u00e7\u00e3o em que uma vari\u00e1vel da qual o efeito depende n\u00e3o estiver inclu\u00edda na array de depend\u00eancia, o efeito poder\u00e1 n\u00e3o ser reexecutado quando o valor for alterado. Isso pode levar a um comportamento inesperado e a erros em seu aplicativo.<\/p>\n<p>Esse erro n\u00e3o \u00e9 um erro do React, mas um erro do ESLint. O <a href=\"https:\/\/www.npmjs.com\/package\/eslint-config-react-app\" target=\"_blank\" rel=\"noopener noreferrer\">ESLint<\/a> fornece um plugin espec\u00edfico para o React, que inclui um conjunto de regras criadas para ajudar os desenvolvedores a escrever um c\u00f3digo React melhor. Uma dessas regras \u00e9 a regra <code>\"react-hooks\/exhaustive-deps\"<\/code>, que detecta o erro &#8220;React Hook useEffect has a missing dependency&#8221;.<\/p>\n<p>Como exemplo, vamos analisar um componente funcional que tem um estado de contagem. Espera-se que esse componente tamb\u00e9m registre uma mensagem com o valor de <code>count<\/code> no console sempre que ele for alterado:<\/p>\n<pre><code class=\"language-jsx\">import { useState, useEffect } from 'react';\n\nconst App = () =&gt; {\n  const [count, setCount] = useState(0);\n\n  useEffect(() =&gt; {\n    console.log(`You clicked ${count} times`);\n  }, []);\n\n  return (\n    &lt;div&gt;\n      &lt;h1&gt;Hello World&lt;\/h1&gt;\n      &lt;p&gt;Count: {count}&lt;\/p&gt;\n      &lt;button onClick={() =&gt; setCount(count + 1)}&gt;Increment&lt;\/button&gt;\n    &lt;\/div&gt;\n  );\n};\n\nexport default App;<\/code><\/pre>\n<p>No exemplo acima, voc\u00ea tem um componente funcional que usa os hooks <code>useState<\/code> e <code>useEffect<\/code>. O hook <code>useEffect<\/code> \u00e9 usado para registrar em registro uma mensagem com o valor da vari\u00e1vel de estado <code>count<\/code> sempre que ela for alterada.<\/p>\n<p>No entanto, observe que a vari\u00e1vel <code>count<\/code> n\u00e3o est\u00e1 listada na segunda array de argumentos (array de depend\u00eancia) do hook <code>useEffect<\/code>. Isso acionar\u00e1 o erro &#8220;React hook useEffect has a missing dependency&#8221;.<\/p>\n<figure style=\"width: 1600px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/kinqsta.com\/wp-content\/uploads\/2023\/03\/useeffect-dependency-error.jpg\" alt=\"Mensagem de erro \"React hook useEffect has a missing dependency\".\" width=\"1600\" height=\"201\"><figcaption class=\"wp-caption-text\">Mensagem de erro &#8220;React hook useEffect has a missing dependency&#8221;.<\/figcaption><\/figure>\n<h2>3 maneiras de corrigir o erro &#8220;React hook useEffect has a missing dependency&#8221;<\/h2>\n<p>Esse erro pode ser corrigido de diferentes maneiras, dependendo da abordagem que voc\u00ea deseja usar. Aqui est\u00e3o as v\u00e1rias maneiras.<\/p>\n<ul>\n<li>Adicionar todas as depend\u00eancias ausentes<\/li>\n<li>Usar hooks de memoiza\u00e7\u00e3o ao trabalhar com objetos e fun\u00e7\u00f5es<\/li>\n<li>Desativar a regra do ESLint<\/li>\n<\/ul>\n<h3>1. Adicionar a depend\u00eancia ausente \u00e0 array de depend\u00eancias de useEffect<\/h3>\n<p>A maneira mais direta de resolver esse erro \u00e9 incluir todas as depend\u00eancias usadas no hook <code>useEffect<\/code> na array de depend\u00eancias. Ent\u00e3o voc\u00ea pode se perguntar: como eu conhe\u00e7o uma depend\u00eancia?<\/p>\n<p>Para identificar uma depend\u00eancia ausente, voc\u00ea precisa observar as vari\u00e1veis ou os valores usados no hook <code>useEffect<\/code>. Se qualquer uma dessas vari\u00e1veis ou valores puder mudar com o tempo, eles dever\u00e3o ser inclu\u00eddos na array de depend\u00eancias.<\/p>\n<p>Por exemplo, no trecho de c\u00f3digo fornecido anteriormente, a vari\u00e1vel <code>count<\/code> \u00e9 usada dentro do hook <code>useEffect<\/code>, mas n\u00e3o est\u00e1 inclu\u00edda na array de depend\u00eancia. Isso significa que, se a vari\u00e1vel <code>count<\/code> for alterada, o hook <code>useEffect<\/code> n\u00e3o ser\u00e1 executado novamente e o componente poder\u00e1 ter dados obsoletos ou outros problemas.<\/p>\n<p>Para corrigir esse erro, podemos adicionar a vari\u00e1vel <code>count<\/code> \u00e0 array de depend\u00eancias, da seguinte forma:<\/p>\n<pre><code class=\"language-jsx\">import { useState, useEffect } from 'react';\n\nconst App = () =&gt; {\n  const [count, setCount] = useState(0);\n\n  useEffect(() =&gt; {\n    console.log(`You clicked ${count} times`);\n  }, [count]);\n\n  return (\n    &lt;div&gt;\n      &lt;h1&gt;Hello World&lt;\/h1&gt;\n      &lt;p&gt;Count: {count}&lt;\/p&gt;\n      &lt;button onClick={() =&gt; setCount(count + 1)}&gt;Increment&lt;\/button&gt;\n    &lt;\/div&gt;\n  );\n};\n\nexport default App;<\/code><\/pre>\n<p>Ao adicionar a vari\u00e1vel <code>count<\/code> ao array de depend\u00eancias, dizemos ao React para reexecutar o hook <code>useEffect<\/code> sempre que a vari\u00e1vel count for alterada.<\/p>\n<p>Isso garante que o componente sempre tenha dados atualizados e evita o erro &#8220;React Hook useEffect has a missing dependency&#8221;.<\/p>\n<p>Se voc\u00ea tiver mais de uma depend\u00eancia, adicione-as \u00e0 array de depend\u00eancias e separe-as com uma v\u00edrgula:<\/p>\n<pre><code class=\"language-jsx\">import { useState, useEffect } from 'react';\nconst App = () =&gt; {\n  const [firstName, setFirstName] = useState('');\n  const [lastName, setLastName] = useState('');\n  const [fullName, setFullName] = useState('');\n\n  useEffect(() =&gt; {\n    setFullName(`${firstName} ${lastName}`);\n  }, [firstName, lastName]);\n\n  const handleFirstNameChange = (event) =&gt; {\n    setFirstName(event.target.value);\n  };\n\n  const handleLastNameChange = (event) =&gt; {\n    setLastName(event.target.value);\n  };\n\n  return (\n    &lt;div&gt;\n      &lt;label&gt;\n        First Name:\n        &lt;input type=\"text\" value={firstName} onChange={handleFirstNameChange} \/&gt;\n      &lt;\/label&gt;\n      &lt;label&gt;\n        Last Name:\n        &lt;input type=\"text\" value={lastName} onChange={handleLastNameChange} \/&gt;\n      &lt;\/label&gt;\n      &lt;p&gt;Full Name: {fullName}&lt;\/p&gt;\n    &lt;\/div&gt;\n  );\n};\n\nexport default App;<\/code><\/pre>\n<h3>2. Trabalho com objetos e fun\u00e7\u00f5es<\/h3>\n<p>Ao trabalhar com objetos e arrays, n\u00e3o basta adicion\u00e1-los \u00e0 sua array de depend\u00eancias; voc\u00ea precisar\u00e1 memoriz\u00e1-los ou mov\u00ea-los para o hook <code>useEffect<\/code> ou para fora do componente para evitar novas renderiza\u00e7\u00f5es desnecess\u00e1rias.<\/p>\n<p>Isso ocorre porque, no <a href=\"https:\/\/kinqsta.com\/javascript\/\">JavaScript<\/a>, os objetos e as arrays s\u00e3o comparados por refer\u00eancia e apontam para um local diferente na mem\u00f3ria todas as vezes &#8211; seu valor ser\u00e1 alterado em cada renderiza\u00e7\u00e3o, causando um loop infinito de nova renderiza\u00e7\u00e3o.<\/p>\n<p>Aqui est\u00e1 um exemplo que causa o erro:<\/p>\n<pre><code class=\"language-jsx\">import { useState, useEffect } from 'react';\n\nconst App = () =&gt; {\n  const [user, setUser] = useState({});\n\n  \/\/ \ud83d\udc47\ufe0fthis will change on every render\n  let newUser = { name: 'Jane', age: 28 };\n\n  useEffect(() =&gt; {\n    setUser(newUser);\n  }, [newUser]);\n\n  return (\n    &lt;div&gt;\n      &lt;h1&gt;Hello World&lt;\/h1&gt;\n    &lt;\/div&gt;\n  );\n};\n\nexport default App;<\/code><\/pre>\n<p>Voc\u00ea pode corrigir esse erro movendo o objeto para o hook <code>useEffect<\/code> ou movendo para fora do componente:<\/p>\n<pre><code class=\"language-jsx\">import { useState, useEffect } from 'react';\n\nconst App = () =&gt; {\n  const [user, setUser] = useState({});\n\n  useEffect(() =&gt; {\n    let newUser = { name: 'Jane', age: 28 };\n    setUser(newUser);\n  }, []);\n\n  return (\n    &lt;div&gt;\n      &lt;h1&gt;Hello World&lt;\/h1&gt;\n    &lt;\/div&gt;\n  );\n};\n\nexport default App;<\/code><\/pre>\n<p>Uma maneira melhor de resolver esse problema \u00e9 usar hooks de memoiza\u00e7\u00e3o como <code>useMemo<\/code> para o objeto e <code>useCallback<\/code> para as fun\u00e7\u00f5es. Isso ajudar\u00e1 voc\u00ea a manter o objeto ou a fun\u00e7\u00e3o dentro do componente e na array de depend\u00eancia.<\/p>\n<p><strong>Observa\u00e7\u00e3o<\/strong>: Os hooks de memoriza\u00e7\u00e3o s\u00e3o um conjunto de hooks que permitem que voc\u00ea armazene em cache os resultados de c\u00e1lculos dispendiosos e evite recalcul\u00e1-los desnecessariamente.<\/p>\n<p>Esta \u00e9 a apar\u00eancia do seu c\u00f3digo quando voc\u00ea usar o hook <code>useMemo<\/code> para memoizar seu objeto:<\/p>\n<pre><code class=\"language-jsx\">import { useState, useEffect, useMemo } from 'react';\n\nconst App = () =&gt; {\n  const [user, setUser] = useState({});\n\n  const newUser = useMemo(() =&gt; {\n    return { name: 'John', age: 30 };\n  }, []);\n\n  useEffect(() =&gt; {\n    setUser(newUser);\n  }, [newUser]);\n\n  return (\n    &lt;div&gt;\n      &lt;h1&gt;Hello World&lt;\/h1&gt;\n    &lt;\/div&gt;\n  );\n};\n\nexport default App;<\/code><\/pre>\n<p>Da mesma forma, ao trabalhar com fun\u00e7\u00f5es, voc\u00ea pode usar o hook <code>useCallback<\/code>.<\/p>\n<h3>3. Desative a regra ESLint<\/h3>\n<p>O erro &#8220;React hook useEffect has a missing dependency&#8221; \u00e9 um erro de aviso do ESLint, o que significa que voc\u00ea pode desativar a regra para que ela n\u00e3o lance o erro. Essa abordagem n\u00e3o \u00e9 recomendada em todos os casos, mas pode ser uma solu\u00e7\u00e3o r\u00e1pida se voc\u00ea tiver certeza de que a depend\u00eancia ausente n\u00e3o \u00e9 um problema.<\/p>\n<p>Voc\u00ea pode fazer isso adicionando o seguinte coment\u00e1rio antes da linha da array de depend\u00eancia.<\/p>\n<pre><code class=\"language-jsx\">\/\/ eslint-disable-next-line react-hooks\/exhaustive-deps<\/code><\/pre>\n<p>Aqui est\u00e1 um exemplo:<\/p>\n<pre><code class=\"language-jsx\">useEffect(() =&gt; {\n  console.log(`You clicked ${count} times`);\n  \n\/\/ eslint-disable-next-line react-hooks\/exhaustive-deps\n}, []);<\/code><\/pre>\n<p>\u00c9 importante observar que a desativa\u00e7\u00e3o da regra ESLint pode levar a outros problemas no futuro se voc\u00ea n\u00e3o for cuidadoso. Certifique-se de que voc\u00ea entenda completamente as consequ\u00eancias da desativa\u00e7\u00e3o de uma regra antes de fazer isso e considere solu\u00e7\u00f5es alternativas, se poss\u00edvel.<\/p>\n<h2>Resumo<\/h2>\n<p>O erro &#8220;React hook useEffect has a missing dependency&#8221; \u00e9 um problema comum enfrentado pelos <a href=\"https:\/\/kinqsta.com\/pt\/blog\/aplicativo-clone-chatgpt-react-e-api-openai\/\">desenvolvedores de React<\/a> ao trabalhar com o hook useEffect.<\/p>\n<p>Ao corrigir o erro, \u00e9 importante considerar os melhores m\u00e9todos para o seu caso de uso espec\u00edfico. Em geral, \u00e9 melhor evitar desativar a regra do ESLint que est\u00e1 causando o erro, pois isso pode levar a outros problemas no futuro. Em vez disso, tente resolver o problema incluindo a depend\u00eancia ausente na array de depend\u00eancias ou usando o hook de memoiza\u00e7\u00e3o correto.<\/p>\n<p><em>Agora \u00e9 a sua vez: Voc\u00ea j\u00e1 enfrentou esse problema? Como o resolveu? Existe alguma outra abordagem que voc\u00ea utilizou e que n\u00e3o foi mencionada neste artigo? Compartilhe conosco nos coment\u00e1rios!<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>O hook useEffect do React se tornou um recurso popular na biblioteca React desde sua introdu\u00e7\u00e3o na vers\u00e3o 16.8. Ele permite que os desenvolvedores executem efeitos &#8230;<\/p>\n","protected":false},"author":287,"featured_media":67661,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_kinsta_gated_content":false,"_kinsta_gated_content_redirect":"","footnotes":""},"tags":[],"topic":[1003,1002],"class_list":["post-67660","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","topic-erros-do-react","topic-react"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v24.6 (Yoast SEO v24.6) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Como Corrigir o Erro \u201cReact Hook useEffect Has a Missing Dependency\u201d - Kinsta\u00ae<\/title>\n<meta name=\"description\" content=\"Aprenda 3 maneiras diferentes de corrigir o erro comum que os desenvolvedores encontram, o erro \u201cReact Hook useEffect Has a Missing Dependency\u201d\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/kinqsta.com\/pt\/blog\/react-hook-useeffect-has-a-missing-dependency\/\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Como Corrigir o Erro \u201cReact Hook useEffect Has a Missing Dependency\u201d\" \/>\n<meta property=\"og:description\" content=\"Aprenda 3 maneiras diferentes de corrigir o erro comum que os desenvolvedores encontram, o erro \u201cReact Hook useEffect Has a Missing Dependency\u201d\" \/>\n<meta property=\"og:url\" content=\"https:\/\/kinqsta.com\/pt\/blog\/react-hook-useeffect-has-a-missing-dependency\/\" \/>\n<meta property=\"og:site_name\" content=\"Kinsta\u00ae\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/kinstapt\/\" \/>\n<meta property=\"article:published_time\" content=\"2024-04-04T11:14:52+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-10-01T20:00:30+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/kinqsta.com\/pt\/wp-content\/uploads\/sites\/3\/2024\/03\/react-hook-useeffect-has-a-missing-dependency.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"3042\" \/>\n\t<meta property=\"og:image:height\" content=\"1521\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Joel Olawanle\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:description\" content=\"Aprenda 3 maneiras diferentes de corrigir o erro comum que os desenvolvedores encontram, o erro \u201cReact Hook useEffect Has a Missing Dependency\u201d\" \/>\n<meta name=\"twitter:image\" content=\"https:\/\/kinqsta.com\/pt\/wp-content\/uploads\/sites\/3\/2024\/03\/react-hook-useeffect-has-a-missing-dependency.jpg\" \/>\n<meta name=\"twitter:creator\" content=\"@olawanle_joel\" \/>\n<meta name=\"twitter:site\" content=\"@kinsta_pt\" \/>\n<meta name=\"twitter:label1\" content=\"Escrito por\" \/>\n\t<meta name=\"twitter:data1\" content=\"Joel Olawanle\" \/>\n\t<meta name=\"twitter:label2\" content=\"Tempo estimado de leitura\" \/>\n\t<meta name=\"twitter:data2\" content=\"7 minutos\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/kinqsta.com\/pt\/blog\/react-hook-useeffect-has-a-missing-dependency\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/kinqsta.com\/pt\/blog\/react-hook-useeffect-has-a-missing-dependency\/\"},\"author\":{\"name\":\"Joel Olawanle\",\"@id\":\"https:\/\/kinqsta.com\/pt\/#\/schema\/person\/efa7de30245ca15be5ce1dcacff89c07\"},\"headline\":\"Como Corrigir o Erro \u201cReact Hook useEffect Has a Missing Dependency\u201d\",\"datePublished\":\"2024-04-04T11:14:52+00:00\",\"dateModified\":\"2025-10-01T20:00:30+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/kinqsta.com\/pt\/blog\/react-hook-useeffect-has-a-missing-dependency\/\"},\"wordCount\":1147,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/kinqsta.com\/pt\/#organization\"},\"image\":{\"@id\":\"https:\/\/kinqsta.com\/pt\/blog\/react-hook-useeffect-has-a-missing-dependency\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/kinqsta.com\/pt\/wp-content\/uploads\/sites\/3\/2024\/03\/react-hook-useeffect-has-a-missing-dependency.jpg\",\"inLanguage\":\"pt-PT\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/kinqsta.com\/pt\/blog\/react-hook-useeffect-has-a-missing-dependency\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/kinqsta.com\/pt\/blog\/react-hook-useeffect-has-a-missing-dependency\/\",\"url\":\"https:\/\/kinqsta.com\/pt\/blog\/react-hook-useeffect-has-a-missing-dependency\/\",\"name\":\"Como Corrigir o Erro \u201cReact Hook useEffect Has a Missing Dependency\u201d - 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