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ecmacript-classes-rocketseat's Introduction

EcmaScript - Nova forma de escrever o JavaScript

Babel

  • Converte as classes - que não são entendidas nativamente pelos navegadores, em uma sintaxe de funções para o código poder ser entendido pelos navegadores.

  • O babel cria outro arquivo .js, convertido de EcmaScript para JavaScript.

Webpack - Servidor para LiveReload, atualiza o babel a cada alteração salva no código.

  • Servidor de Desenvolvimento

******* iniciando uma aplicação

npm init na raiz do projeto

npm install @babel/cli npm install @babel/preset-env npm install @babel/core npm install @babel/plugin-proposal-object-rest-spread //Para utilizar os operadores rest e spread = ...

**** Configurar Babel

  • Criar arquivo .babelrc na raiz do projeto

    • instanciar os presets;
  • Criar arquivo index.html e main.js;

  • Configurar script dev no package.json

    • {"dev": "babel ./main.js -o bundle.js -w "}

** O source do script no HTML deve ser o bundle.js**

  • Webpack - serve para rodar arquivos que vão alem do inde.html e main .js e todos os arquivos continuarao sendo convertidos no bundle.js

-- Adicionando webpack na aplicação - npm install webpack webpack-cli -D

- criar arquivo de configuração do Webpack

nome: webpack.config.js
Ver dados do arquivo acima...

depois de configurado o arquivo, deve instalar o babel loader
- npm install babel-loader

Alterar script no package.json para conseguir rodar o webpack
- "dev": "webpack --mode=development -w"

Instalar webpack-dev-server
- npm install webpack-dev-server -D
    - adicionar o dev-server no webpack.config
    - alterar script no package.json

    A partir de agora a aplicação está rodando em um servidor local

-- ***** ASYNC AWAIT ***** - o async await é uma função do ES8 que não é nativa no Babel, então, deve-se instalar as seguintes dependencias... - npm install @babel/plugin-transform-async-to-generator -D - colocar nos plugins do babelrc - npm install @babel/polyfill -D - colocar no entry do webpack.config

-- ***** AXIOS ***** - Utilizado para acessar as api's externas do código - npm install axios

importar no main.js para ser utilizado

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