typescript(option): feat: using symbols instead of plain strings

Signed-off-by: prescientmoon <git@moonythm.dev>

typescript/option/src/helpers.ts

@@ -7,8 +7,7 @@ import {
     BackFolder,
     Nullable
 } from './internalTypes'
-import { identity } from './internalHelperts'
-import { none, some } from './internals'
+import { identity, none, some } from './internals'
 
 export const isSome = <T>(option: Option<T>) => option._type === some
 export const isNothing = <T>(option: Option<T>) => option._type === none

typescript/option/src/internalHelperts.ts

@@ -1 +0,0 @@
-export const identity = <T>(v: T) => v

typescript/option/src/internals.ts

@@ -1,7 +1,4 @@
-export const some = 'some'
-export const none = 'none'
+export const identity = <T>(v: T) => v
 
-export type NominalTyped<T, U> = {
-    _type: T
-    value: U
-}
+export const some = Symbol('some')
+export const none = Symbol('none')

typescript/option/src/types.ts

@@ -1,16 +1,21 @@
-import { NominalTyped, none, some } from './internals'
+import { some, none } from './internals'
 
-export type None = NominalTyped<'none', null>
-export type Some<T> = NominalTyped<'some', T>
+type NominalTyped<T, U> = {
+    _type: T
+    value: U
+}
+
+export type None = NominalTyped<typeof none, null>
+export type Some<T> = NominalTyped<typeof some, T>
 
 export type Option<T> = Some<T> | None
 
 export const None: Option<any> = {
-    _type: 'none',
+    _type: none,
     value: null
 }
 
 export const Some = <T>(value: T): Option<T> => ({
-    _type: 'some',
+    _type: some,
     value
 })