April 2025
Intermediate to advanced
298 pages
7h 13m
Portuguese (Portugal, Brazil)
Content preview from Aprendendo padrões de design JavaScript, 2ª edição
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Capítulo 10. Padrões de Design Modular do JavaScript
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No mundo do JavaScript escalável, quando dizemos que uma aplicação é modular, geralmente queremos dizer que ela é composta de um conjunto de partes distintas e altamente desacopladas de funcionalidade armazenadas em módulos. O acoplamento frouxo facilita a manutenção das aplicações, removendo as dependências sempre que possível. Quando implementado de forma eficiente, torna-se bastante fácil ver como as alterações a uma parte de um sistema podem afetar outra.
Nos capítulos anteriores, abordamos a importância da programação modular e a maneira moderna de implementar padrões de design modular. Embora o ES2015 tenha introduzido módulos nativos no JavaScript, escrever JavaScript modular ainda era possível antes de 2015.
Nesta seção, veremos três formatos para JavaScript modular usando a sintaxe JavaScript clássica (ES5): Definição de módulo assíncrono (AMD), CommonJS e Definição de módulo universal (UMD). Para saber mais sobre módulos JavaScript, consulta o Capítulo 5, que aborda a sintaxe ES2015+ para importações de módulos, exportações e muito mais.
Uma nota sobre carregadores de scripts
Não é fácil falar sobre AMD e módulos CommonJS sem falar sobre carregadores de scripts. O carregamento de scripts era um meio para atingir um objetivo. O JavaScript modular só poderia ser implementado usando carregadores ...
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