feat(types): MessageFn

Signed-off-by: Lexus Drumgold <[email protected]>

Author: unicornware

src/index.ts

@@ -4,3 +4,4 @@
  */
 
 export { default as determineSpecificType } from './determine-specific-type'
+export * from './types'

src/types/__tests__/fn-message.spec-d.ts

@@ -0,0 +1,17 @@
+/**
+ * @file Unit Tests - MessageFn
+ * @module create-node-error/types/tests/unit-d/MessageFn
+ */
+
+import type TestSubject from '../fn-message'
+
+describe('unit-d:types/MessageFn', () => {
+  it('should extract parameters from type parameter', () => {
+    expectTypeOf<TestSubject<[string]>>().parameter(0).toBeString()
+    expectTypeOf<TestSubject<[string, boolean]>>().parameter(1).toBeBoolean()
+  })
+
+  it('should return string', () => {
+    expectTypeOf<TestSubject>().returns.toBeString()
+  })
+})

src/types/fn-message.ts

@@ -0,0 +1,16 @@
+/**
+ * @file Type Definitions - MessageFn
+ * @module create-node-error/types/MessageFn
+ */
+
+/**
+ * Formats an error message.
+ *
+ * @template Args - Function parameters
+ *
+ * @param {Args} args - Function parameters
+ * @return {string} Formatted error message
+ */
+type MessageFn<Args extends any[] = any[]> = (...args: Args) => string
+
+export type { MessageFn as default }

src/types/index.ts

@@ -0,0 +1,6 @@
+/**
+ * @file Entry Point - Type Definitions
+ * @module create-node-error/types
+ */
+
+export type { default as MessageFn } from './fn-message'