{"id":3941,"date":"2020-09-24T08:52:00","date_gmt":"2020-09-24T08:52:00","guid":{"rendered":"http:\/\/the-codest.localhost\/blog\/why-you-should-probably-use-typescript\/"},"modified":"2026-04-27T09:49:47","modified_gmt":"2026-04-27T09:49:47","slug":"porque-e-que-provavelmente-deve-usar-typescript","status":"publish","type":"post","link":"https:\/\/thecodest.co\/pt\/blog\/why-you-should-probably-use-typescript\/","title":{"rendered":"Porque \u00e9 que deve (provavelmente) utilizar Typescript"},"content":{"rendered":"<p>Posi\u00e7\u00e3o atual de <a href=\"https:\/\/thecodest.co\/pt\/dictionary\/typescript-developer\/\">Tipografia<\/a> n\u00e3o surgiu do nada, uma vez que esta tecnologia \u00e9 capaz de melhorar efetivamente a nossa experi\u00eancia de programador. Uma codifica\u00e7\u00e3o mais expl\u00edcita aumenta o controlo e a previsibilidade da <a href=\"https:\/\/thecodest.co\/pt\/dictionary\/what-is-code-refactoring\/\">c\u00f3digo<\/a>.<br>Neste artigo, vou tentar convenc\u00ea-lo a utilizar o Typescript.<\/p>\n\n\n\n<p>*- <a href=\"https:\/\/thecodest.co\/pt\/blog\/app-data-collection-security-risks-value-and-types-explored\/\">Dados<\/a> fonte: <a href=\"https:\/\/2020.stateofjs.com\/en-US\/technologies\/javascript-flavors\/\">Estado da JS 2020<\/a> e <a href=\"https:\/\/insights.stackoverflow.com\/survey\/2020#most-loved-dreaded-and-wanted\">Inqu\u00e9rito aos programadores do Stack Overflow 2020<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Descobrir os erros mais cedo<\/h2>\n\n\n\n<p>Normalmente, quando se est\u00e1 a desenvolver uma aplica\u00e7\u00e3o em <a href=\"https:\/\/thecodest.co\/pt\/blog\/hire-javascript-developer\/\">JavaScript<\/a>, o seu fluxo pode<br>tem este aspeto:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Fazer uma mudan\u00e7a,<\/li>\n\n\n\n<li>Aceda \u00e0 aplica\u00e7\u00e3o e verifique a parte alterada \/ Executar testes (relacionados).<\/li>\n\n\n\n<li>Verificar se est\u00e1 tudo bem.<\/li>\n<\/ol>\n\n\n\n<p>Com o Typescript, \u00e9 poss\u00edvel fazer a altera\u00e7\u00e3o e, se houver algum <strong>erro de tipo<\/strong> no seu c\u00f3digo, saber\u00e1 imediatamente gra\u00e7as \u00e0 mensagem de erro do compilador ou ao feedback em tempo real do IDE.<br>\u00c9 claro que o compilador Typescript n\u00e3o resolver\u00e1 todos os problemas e n\u00e3o avisar\u00e1 sobre todos os erros, mas a sua ajuda pode ser inestim\u00e1vel.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Melhor conclus\u00e3o da sintaxe nos IDEs<\/h2>\n\n\n\n<p>\u00c9 muito simples. Se estiver a utilizar bons IDE, como o WebStorm ou o VSCode, obter\u00e1<br>melhor preenchimento de sintaxe com Typescript. Talvez n\u00e3o pare\u00e7a uma grande melhoria da experi\u00eancia do programador, mas, eventualmente, cada melhoria \u00e9 importante, pois pode salvar <a href=\"https:\/\/thecodest.co\/pt\/blog\/why-us-companies-are-opting-for-polish-developers\/\">n\u00f3s<\/a> e, mais uma vez, evitar uma gralha ou um erro. Al\u00e9m disso, podemos definir o nosso tipo ou interface uma vez; como n\u00e3o temos de nos lembrar sempre da estrutura, podemos concentrar-nos em escrever a l\u00f3gica comercial.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"\/app\/uploads\/2024\/05\/code.png\" alt=\"c\u00f3digo\" title=\"C\u00f3digo JS\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"\/app\/uploads\/2024\/05\/js-code.png\" alt=\"C\u00f3digo JS\" title=\"c\u00f3digo\"\/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Refactoring menos doloroso<\/h2>\n\n\n\n<p>Imagine que tem de refactorizar por qualquer raz\u00e3o, por exemplo, juntou-se a um <a href=\"https:\/\/thecodest.co\/pt\/dictionary\/why-do-projects-fail\/\">projeto<\/a> e recebe a tarefa de adicionar uma nova funcionalidade, mas essa funcionalidade est\u00e1 de alguma forma ligada ao c\u00f3digo antigo.<br>O Typescript pode torn\u00e1-lo mais f\u00e1cil e menos doloroso, porque quando se faz uma altera\u00e7\u00e3o e h\u00e1 outro s\u00edtio onde se tem de fazer outra altera\u00e7\u00e3o, o compilador avisa-o disso.<\/p>\n\n\n\n<p>Por exemplo - pode ser uma assinatura de fun\u00e7\u00e3o alterada ou talvez, ap\u00f3s a altera\u00e7\u00e3o, uma<br>devolver\u00e1 algo totalmente diferente, pelo que o tipo devolvido tamb\u00e9m ser\u00e1 diferente.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Ter mais confian\u00e7a na base de c\u00f3digo<\/h2>\n\n\n\n<p>JavaScript \u00e9 fracamente e dinamicamente tipado, ent\u00e3o quando voc\u00ea inicializa uma vari\u00e1vel com o valor <code>let query = ''<\/code> mais tarde no c\u00f3digo, o programador pode fazer algo irracional por engano, por exemplo <code>consulta = verdadeiro<\/code>e ser\u00e1 v\u00e1lido <a href=\"https:\/\/thecodest.co\/pt\/blog\/hire-vue-js-developers\/\">JS<\/a> c\u00f3digo.<\/p>\n\n\n\n<p>Num c\u00f3digo bem escrito, a atribui\u00e7\u00e3o de um valor booleano a uma vari\u00e1vel que anteriormente era uma cadeia de caracteres n\u00e3o deveria acontecer. Por isso, normalmente, essa atribui\u00e7\u00e3o com mudan\u00e7a de tipo resulta de um erro.<\/p>\n\n\n\n<p>Ao usar o Typescript, n\u00e3o podemos alterar o tipo da vari\u00e1vel, portanto, se fizermos a vari\u00e1vel <code>let query = ''<\/code> vari\u00e1vel, ser\u00e1 <code>corda<\/code> e n\u00e3o poderemos alterar o seu tipo por engano.<\/p>\n\n\n\n<p>Se quisermos que uma vari\u00e1vel seja de mais do que um tipo, fazemo-lo sempre explicitamente utilizando o tipo union, por exemplo <code>cadeia | n\u00famero<\/code>.<\/p>\n\n\n\n<p>Por conseguinte, o Typescript torna o nosso c\u00f3digo mais previs\u00edvel e expl\u00edcito.<br>Al\u00e9m disso, o Typescript trata da explicita\u00e7\u00e3o na an\u00e1lise do fluxo de controlo e, se houver a possibilidade de algo correr mal, avisa-o.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"\/app\/uploads\/2024\/05\/code-sample.png\" alt=\"amostra de c\u00f3digo\" title=\"amostra de c\u00f3digo\"\/><\/figure>\n\n\n\n<p>Aqui no exemplo do primeiro <code>se<\/code> bloco, obteremos um erro:<\/p>\n\n\n\n<p><code>TS2339: A propriedade \"battery\" n\u00e3o existe no tipo \"ClothingProduct<\/code> 2 vezes, para <code>bateria<\/code>e <code>ram<\/code> propriedades.<\/p>\n\n\n\n<p>No segundo bloco - <code>sen\u00e3o<\/code>, obteremos esse erro para <code>tamanho<\/code> propriedade. \u00c9 claro que se trata apenas de um exemplo para mostrar como <a href=\"https:\/\/www.typescriptlang.org\/docs\/handbook\/2\/narrowing.html#discriminated-unions\">sindicatos discriminados<\/a> e <a href=\"https:\/\/www.typescriptlang.org\/docs\/handbook\/2\/narrowing.html#control-flow-analysis\">an\u00e1lise do fluxo de controlo<\/a> funcionam em Typescript, pelo que n\u00e3o estamos a fazer nada de muito complexo com esse c\u00f3digo.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Migra\u00e7\u00e3o f\u00e1cil e progressiva a partir do JavaScript<\/h2>\n\n\n\n<p>O c\u00f3digo JavaScript v\u00e1lido \u00e9 ao mesmo tempo c\u00f3digo Typescript v\u00e1lido, pelo que pode migrar a sua base de c\u00f3digo passo a passo. Normalmente, a utiliza\u00e7\u00e3o do modo estrito no Typescript \u00e9 uma boa pr\u00e1tica, mas neste caso,<br>temos de come\u00e7ar por <code>\"strict\": falso<\/code> em <code>tsconfig.json<\/code> e devemos tamb\u00e9m definir mais 2 op\u00e7\u00f5es.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"javascript\" class=\"language-javascript\">\"allowJs\": true, \/\/ permite-nos utilizar ficheiros .js e o tipo n\u00e3o ser\u00e1 verificado nos mesmos\n\"skipLibCheck\": true \/\/ n\u00e3o verifica os tipos nas bibliotecas que usamos<\/code><\/pre>\n\n\n\n<p>Com estas op\u00e7\u00f5es, podemos migrar de JS para TS passo a passo - ficheiro a ficheiro, mudando simplesmente a extens\u00e3o de <code>.js(x)<\/code> para <code>.ts(x)<\/code> e adicionando tipos nos ficheiros. Utilizando esta abordagem, podemos evitar centenas ou milhares de erros de compila\u00e7\u00e3o assustadores.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Resumo<\/h2>\n\n\n\n<p>Penso que devemos utilizar <b>Tipografia<\/b> t\u00e3o frequentemente quanto <strong>poss\u00edvel<\/strong>porque \u00e9 realmente ben\u00e9fico a longo prazo. Ajuda a manter os projectos, aumenta a experi\u00eancia dos programadores e torna a nossa base de c\u00f3digo mais expl\u00edcita e fi\u00e1vel.<\/p>\n\n\n\n<p>No entanto, como sempre, h\u00e1 excep\u00e7\u00f5es - por exemplo, para uma simples p\u00e1gina de destino<br>se o JavaScript for utilizado apenas para alternar a classe ou outro caso simples, o Typescript n\u00e3o faz sentido.<br>Al\u00e9m disso, temos de nos lembrar que, para tirar o m\u00e1ximo partido do Typescript, temos de aprender a utiliz\u00e1-lo a um n\u00edvel suficiente, e isso pode demorar algum tempo. Penso que continua a ser um investimento muito rent\u00e1vel do seu tempo.<\/p>\n\n\n\n<p><strong>Ler mais:<\/strong><\/p>\n\n\n\n<p><a href=\"https:\/\/thecodest.co\/blog\/ruby-3-0-ruby-and-lesser-known-privacy-control-methods\/\">Ruby 3.0. Ruby e m\u00e9todos de controlo da privacidade menos conhecidos<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/thecodest.co\/blog\/highest-quality-code-in-your-saas-project\/\">C\u00f3digo da mais alta qualidade no seu projeto SaaS. Porque \u00e9 que um fundador (n\u00e3o t\u00e9cnico) se deve preocupar com isso?<\/a><\/p>\n\n\n\n<p><em>*O gr\u00e1fico do t\u00edtulo foi retirado do s\u00edtio Web Know Your Meme.<\/em><\/p>","protected":false},"excerpt":{"rendered":"<p>Toda a gente que utiliza o ecossistema JavaScript conhece hoje em dia o Typescript. O Typescript \u00e9 uma das tecnologias mais adoradas* e a sua utiliza\u00e7\u00e3o est\u00e1 a aumentar constantemente (a quota de utiliza\u00e7\u00e3o aumentou de 52% em 2018 para 78% em 2020)*.<\/p>","protected":false},"author":2,"featured_media":3942,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[8],"tags":[],"class_list":["post-3941","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-software-development"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.3 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Why you should (probably) use Typescript - The Codest<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/thecodest.co\/pt\/blogue\/porque-e-que-provavelmente-deve-usar-typescript\/\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Why you should (probably) use Typescript\" \/>\n<meta property=\"og:description\" content=\"Everyone who use JavaScript ecosystem is nowadays aware of Typescript. 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