.eslintrc: Eslint settings which help us code easier and cleaner
All Babel API options except the callbacks are allowed (because .babelrc files are serialized as JSON5).
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List of presets (a set of plugins) to load and use, consist of
@babel/preset-react@babel/preset-env: is a smart preset that allows you to use the latest JavaScript without needing to micromanage which syntax transforms (and optionally, browser polyfills) are needed by your target environment(s)
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List of plugins to load and use, consist of:
@babel/plugin-transform-runtime: A plugin that enables the re-use of Babel's injected helper code to save on codesize.@babel/plugin-proposal-object-rest-spread@babel/plugin-proposal-decorators@babel/plugin-proposal-class-properties
Tells git to ignore certain files and folders which don't need to be version controlled, like the build folder.