Here is an example that highlights the question, but unfortunately it does not function as intended:
function test({ name = 'Bob', age = 18 }: { readonly name?: string, readonly age?: number }) {
// this should result in an error (but doesn't):
name = 'Lisa';
}
This informative article offers insights on achieving Immutability with parameters. However, it seems that default parameters do not support this feature.
This could be seen as a workaround, but in actuality, you are not passing 'named parameters', rather you are passing an object.
Therefore, it can be easily rephrased as:
function example(parameters: { name?: string, age?: number }) {
const { name = 'Bob', age = 18 } = parameters;
// this will result in an error
name = 'Lisa';
}
The reason why readonly does not carry through is because new variables are being created. The readonly only pertains to the properties of the object and not their values.
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