Allow frozen objects/arrays to be coerced (#1151)

* Add frozen objects/arrays tests

* Update record coercer

* Update tuple coercer

* Update `record()` struct to only coerce non-array objects

src/structs/types.ts

@@ -386,6 +386,9 @@ export function record<K extends string, V>(
         `Expected an object, but received: ${print(value)}`
       )
     },
+    coercer(value) {
+      return isNonArrayObject(value) ? { ...value } : value
+    },
   })
 }
 
@@ -473,6 +476,9 @@ export function tuple<A extends AnyStruct, B extends AnyStruct[]>(
         `Expected an array, but received: ${print(value)}`
       )
     },
+    coercer(value) {
+      return Array.isArray(value) ? value.slice() : value
+    },
   })
 }
 

test/validation/array/valid-frozen.ts

@@ -0,0 +1,9 @@
+import { array, number } from '../../../src'
+
+export const Struct = array(number())
+
+export const data = Object.freeze([1, 2, 3])
+
+export const output = [1, 2, 3]
+
+export const create = true

test/validation/object/valid-frozen.ts

@@ -0,0 +1,18 @@
+import { object, string, number } from '../../../src'
+
+export const Struct = object({
+  name: string(),
+  age: number(),
+})
+
+export const data = Object.freeze({
+  name: 'john',
+  age: 42,
+})
+
+export const output = {
+  name: 'john',
+  age: 42,
+}
+
+export const create = true

test/validation/record/valid-frozen.ts

@@ -0,0 +1,15 @@
+import { record, string, number } from '../../../src'
+
+export const Struct = record(string(), number())
+
+export const data = Object.freeze({
+  a: 1,
+  b: 2,
+})
+
+export const output = {
+  a: 1,
+  b: 2,
+}
+
+export const create = true

test/validation/tuple/valid-frozen.ts

@@ -0,0 +1,9 @@
+import { tuple, string, number } from '../../../src'
+
+export const Struct = tuple([string(), number()])
+
+export const data = Object.freeze(['A', 1])
+
+export const output = ['A', 1]
+
+export const create = true

test/validation/type/valid-frozen.ts

@@ -0,0 +1,18 @@
+import { type, string, number } from '../../../src'
+
+export const Struct = type({
+  name: string(),
+  age: number(),
+})
+
+export const data = Object.freeze({
+  name: 'john',
+  age: 42,
+})
+
+export const output = {
+  name: 'john',
+  age: 42,
+}
+
+export const create = true