fix: make typings more accurate by avoiding explict cast on consts

[kpanot]

Proposed change

When creating an object that is intended to be read-only, we should let typescript infer the type.

Not good:

interface NamedObjectMaybe {
  name?: string;
}
const UNMOVABLE_OBJECT: NamedObjectMaybe = {
  name: 'unicorn'
};

// UNMOVABLE_OBJECT.name is typed as string | undefined

Nice:

interface NamedObjectMaybe {
  name?: string;
}
const UNMOVABLE_OBJECT = {
  name: 'unicorn'
} as const satisfies NamedObjectMaybe;

// UNMOVABLE_OBJECT.name is typed as 'unicorn' but we still validate that UNMOVABLE_OBJECT matches the interface

Related issues

• Pull Request fix: make typings more accurate by avoiding explict cast on consts #2271

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