Make composable responsibilities readonly to nudge towards immutability

Co-authored-by: Janne Savolainen <janne.savolainen@live.fi>

Signed-off-by: Iku-turso <mikko.aspiala@gmail.com>

src/common/utils/composable-responsibilities/discriminable/discriminable.ts

@@ -4,7 +4,7 @@
  */
 
 // See: https://www.typescriptlang.org/docs/handbook/2/narrowing.html#discriminated-unions
-export interface Discriminable<T extends string> { kind: T }
+export interface Discriminable<T extends string> { readonly kind: T }
 
 // Note: this will fail at transpilation time, if all kinds are not instructed in switch/case.
 // See: https://www.typescriptlang.org/docs/handbook/2/narrowing.html#exhaustiveness-checking

src/common/utils/composable-responsibilities/labelable/labelable.ts

@@ -3,5 +3,5 @@
  * Licensed under MIT License. See LICENSE in root directory for more information.
  */
 export interface Labelable {
-  label: string;
+  readonly label: string;
 }

src/common/utils/composable-responsibilities/orderable/orderable.ts

@@ -6,7 +6,7 @@
 import { sortBy } from "lodash/fp";
 
 export interface Orderable {
-  orderNumber: number;
+  readonly orderNumber: number;
 }
 
 export const orderByOrderNumber = <T extends Orderable | {}>(maybeOrderables: T[]) =>

src/common/utils/composable-responsibilities/showable/showable.ts

@@ -7,7 +7,7 @@ import type { IComputedValue } from "mobx";
 import { isBoolean } from "../../type-narrowing";
 
 export interface Showable {
-  isShown: IComputedValue<boolean> | boolean;
+  readonly isShown: IComputedValue<boolean> | boolean;
 }
 
 export type MaybeShowable = Partial<Showable>;