Use TypeScript satisfies operator for option defaults

[bmish]

Details

Throughout the codebase, we have objects which we use to define mappings. We typically want to ensure every value in an enum is mapped to some value and not forgotten (as could easily happen when implementing new notices, types, options, etc), so we use this syntax to ensure that any missing key in the object will cause a type error:

const columns: {
    [key in COLUMN_TYPE]: string;
  } = {
    [COLUMN_TYPE.CONFIGS_ERROR]: '...',
    ...
};

This works fine when every key maps to the same type of value.

But for our option defaults object, there are different types that each option can map to, including boolean, string, or array. When we want to access a particular option default, using the above syntax results in TypeScript thinking the option default could be any of boolean, string, or array, even though it actually has a known type.

The new TypeScript satisfies operator allows us to ensure the object contains all the right keys but without losing the known types for each particular entry in the object.

Waiting on prettier support for TypeScript 4.9: prettier/prettier#13516.

To use this new syntax, you have to select "Select TypeScript Version" in VSCode and choose the workspace version, since VSCode doesn't ship with TypeScript 4.9 yet.