modifications: {
babelSetup?: TransformationModifier<babel.Configuration>,
} = {}
While examining some code in a React project, I came across the above snippet that is passed as an argument to a function. As far as I can tell, the modifications parameter is an object with one key-value pair. The presence of ? indicates that babelSetup is an optional property, which is strange since it's the only entry. But what does the = {} signify at the end of the code?
When no value is provided for the transforms argument, it defaults to an empty object {}. This means that if you do not specify a value, the transforms will automatically be set to {}. Take the function fun as an example:
function fun(arg1: { bool?: true } = {}, arg2: boolean = false) {
}
If you omit providing a value for arg1, it will default to {}. Similarly, if you do not pass a value for arg2, it will default to false within the function fun.
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