Complete #469 - new function asserGuard().

Added new function `typia.assertGuard<T>()` function which performs the assertion guard of TypeScript.

build/internal/TestFeature.ts

@@ -37,6 +37,12 @@ export namespace TestFeature {
             creatable: true,
             spoilable: true,
         },
+        {
+            module: null,
+            method: "assertGuard",
+            creatable: true,
+            spoilable: true,
+        },
         {
             module: null,
             method: "validate",
@@ -59,6 +65,13 @@ export namespace TestFeature {
             spoilable: false,
             strict: true,
         },
+        {
+            module: null,
+            method: "assertGuardEquals",
+            creatable: true,
+            spoilable: false,
+            strict: true,
+        },
         {
             module: null,
             method: "validateEquals",

package.json

@@ -1,6 +1,6 @@
 {
   "name": "typia",
-  "version": "5.3.0-dev.20231112",
+  "version": "5.3.0-dev.20231117",
   "description": "Superfast runtime validators with only one line",
   "main": "lib/index.js",
   "typings": "lib/index.d.ts",

packages/typescript-json/package.json

@@ -1,6 +1,6 @@
 {
   "name": "typescript-json",
-  "version": "5.3.0-dev.20231112",
+  "version": "5.3.0-dev.20231117",
   "description": "Superfast runtime validators with only one line",
   "main": "lib/index.js",
   "typings": "lib/index.d.ts",
@@ -72,7 +72,7 @@
   },
   "homepage": "https://typia.io",
   "dependencies": {
-    "typia": "5.3.0-dev.20231112"
+    "typia": "5.3.0-dev.20231117"
   },
   "peerDependencies": {
     "typescript": ">=4.8.0 <5.3.0"

src/AssertionGuard.ts

@@ -0,0 +1 @@
+export type AssertionGuard<T> = (input: unknown) => asserts input is T;

src/module.ts

@@ -1,5 +1,6 @@
 import { Namespace } from "./functional/Namespace";
 
+import { AssertionGuard } from "./AssertionGuard";
 import { IRandomGenerator } from "./IRandomGenerator";
 import { IValidation } from "./IValidation";
 import { Resolved } from "./Resolved";
@@ -15,6 +16,7 @@ export * as tags from "./tags";
 export * from "./schemas/json/IJsonApplication";
 export * from "./schemas/json/IJsonComponents";
 export * from "./schemas/json/IJsonSchema";
+export * from "./AssertionGuard";
 export * from "./IRandomGenerator";
 export * from "./IValidation";
 export * from "./TypeGuardError";
@@ -38,6 +40,8 @@ export * from "./SnakeCase";
  * If what you want is not asserting but just knowing whether the parametric value is
  * following the type `T` or not, you can choose the {@link is} function instead.
  * Otherwise you want to know all the errors, {@link validate} is the way to go.
+ * Also, if you want to automatically cast the parametric value to the type `T`
+ * when no problem (perform the assertion guard of type).
  *
  * On the other and, if you don't want to allow any superfluous property that is not
  * enrolled to the type `T`, you can use {@link assertEquals} function instead.
@@ -82,6 +86,66 @@ export function assert(): never {
 }
 Object.assign(assert, Namespace.assert("assert"));
 
+/**
+ * Assertion guard of a value type.
+ *
+ * Asserts a parametric value type and throws a {@link TypeGuardError} with detailed
+ * reason, if the parametric value is not following the type `T`. Otherwise, the
+ * value is following the type `T`, nothing would be returned, but the input value
+ * would be automatically casted to the type `T`. This is the concept of
+ * "assertion guard" of a value type.
+ *
+ * If what you want is not asserting but just knowing whether the parametric value is
+ * following the type `T` or not, you can choose the {@link is} function instead.
+ * Otherwise you want to know all the errors, {@link validate} is the way to go.
+ * Also, if you want to returns the parametric value when no problem, you can use
+ * {@link assert} function instead.
+ *
+ * On the other and, if you don't want to allow any superfluous property that is not
+ * enrolled to the type `T`, you can use {@link assertGuardEquals} function instead.
+ *
+ * @template T Type of the input value
+ * @param input A value to be asserted
+ * @throws A {@link TypeGuardError} instance with detailed reason
+ *
+ * @author Jeongho Nam - https://github.com/samchon
+ */
+export function assertGuard<T>(input: T): asserts input is T;
+
+/**
+ * Assertion guard of a value type.
+ *
+ * Asserts a parametric value type and throws a {@link TypeGuardError} with detailed
+ * reason, if the parametric value is not following the type `T`. Otherwise, the
+ * value is following the type `T`, nothing would be returned, but the input value
+ * would be automatically casted to the type `T`. This is the concept of
+ * "assertion guard" of a value type.
+ *
+ * If what you want is not asserting but just knowing whether the parametric value is
+ * following the type `T` or not, you can choose the {@link is} function instead.
+ * Otherwise you want to know all the errors, {@link validate} is the way to go.
+ * Also, if you want to returns the parametric value when no problem, you can use
+ * {@link assert} function instead.
+ *
+ * On the other and, if you don't want to allow any superfluous property that is not
+ * enrolled to the type `T`, you can use {@link assertGuardEquals} function instead.
+ *
+ * @template T Type of the input value
+ * @param input A value to be asserted
+ * @throws A {@link TypeGuardError} instance with detailed reason
+ *
+ * @author Jeongho Nam - https://github.com/samchon
+ */
+export function assertGuard<T>(input: unknown): asserts input is T;
+
+/**
+ * @internal
+ */
+export function assertGuard(): never {
+    halt("assertGuard");
+}
+Object.assign(assertGuard, Namespace.assert("assertGuard"));
+
 /**
  * Tests a value type.
  *
@@ -257,6 +321,72 @@ export function assertEquals(): never {
 }
 Object.assign(assertEquals, Namespace.assert("assertEquals"));
 
+/**
+ * Assertion guard of a type with equality.
+ *
+ * Asserts a parametric value type and throws a {@link TypeGuardError} with detailed
+ * reason, if the parametric value is not following the type `T` or some superfluous
+ * property that is not listed on the type `T` has been found.
+ *
+ * Otherwise, the value is following the type `T` without any superfluous property,
+ * nothing would be returned, but the input value would be automatically casted to
+ * the type `T`. This is the concept of "assertion guard" of a value type.
+ *
+ * If what you want is not asserting but just knowing whether the parametric value is
+ * following the type `T` or not, you can choose the {@link equals} function instead.
+ * Otherwise, you want to know all the errors, {@link validateEquals} is the way to go.
+ * Also, if you want to returns the parametric value when no problem, you can use
+ * {@link assert} function instead.
+ *
+ * On the other hand, if you want to allow superfluous property that is not enrolled
+ * to the type `T`, you can use {@link assertEquals} function instead.
+ *
+ * @template T Type of the input value
+ * @param input A value to be asserted
+ * @returns Parametric input value casted as `T`
+ * @throws A {@link TypeGuardError} instance with detailed reason
+ *
+ * @author Jeongho Nam - https://github.com/samchon
+ */
+export function assertGuardEquals<T>(input: T): asserts input is T;
+
+/**
+ * Assertion guard of a type with equality.
+ *
+ * Asserts a parametric value type and throws a {@link TypeGuardError} with detailed
+ * reason, if the parametric value is not following the type `T` or some superfluous
+ * property that is not listed on the type `T` has been found.
+ *
+ * Otherwise, the value is following the type `T` without any superfluous property,
+ * nothing would be returned, but the input value would be automatically casted to
+ * the type `T`. This is the concept of "assertion guard" of a value type.
+ *
+ * If what you want is not asserting but just knowing whether the parametric value is
+ * following the type `T` or not, you can choose the {@link equals} function instead.
+ * Otherwise, you want to know all the errors, {@link validateEquals} is the way to go.
+ * Also, if you want to returns the parametric value when no problem, you can use
+ * {@link assertEquals} function instead.
+ *
+ * On the other hand, if you want to allow superfluous property that is not enrolled
+ * to the type `T`, you can use {@link assertGuard} function instead.
+ *
+ * @template T Type of the input value
+ * @param input A value to be asserted
+ * @returns Parametric input value casted as `T`
+ * @throws A {@link TypeGuardError} instance with detailed reason
+ *
+ * @author Jeongho Nam - https://github.com/samchon
+ */
+export function assertGuardEquals<T>(input: unknown): asserts input is T;
+
+/**
+ * @internal
+ */
+export function assertGuardEquals(): never {
+    halt("assertGuardEquals");
+}
+Object.assign(assertGuardEquals, Namespace.assert("assertGuardEquals"));
+
 /**
  * Tests equality between a value and its type.
  *
@@ -456,6 +586,65 @@ export function createAssert<T>(): (input: unknown) => T {
 }
 Object.assign(createAssert, assert);
 
+/**
+ * Creates a reusable {@link assertGuard} function.
+ *
+ * Note that, you've to declare the variable type of the factory function caller
+ * like below. If you don't declare the variable type, compilation error be thrown.
+ * This is the special rule of the TypeScript compiler.
+ *
+ * ```typescript
+ * // MUST DECLARE THE VARIABLE TYPE
+ * const func: typia.AssertionGuard<number> = typia.createAssertGuard<number>();
+ *
+ * // IF NOT, COMPILATION ERROR BE OCCURED
+ * const func = typia.createAssertGuard<number>();
+ * ```
+ *
+ * > *Assertions require every name in the call target to be declared with an*
+ * > *explicit type annotation.*
+ *
+ * @danger You must configure the generic argument `T`
+ * @returns Nothing until you configure the generic argument `T`
+ * @throws compile error
+ *
+ * @author Jeongho Nam - https://github.com/samchon
+ */
+export function createAssertGuard(): never;
+
+/**
+ * Creates a reusable {@link assertGuard} function.
+ *
+ * Note that, you've to declare the variable type of the factory function caller
+ * like below. If you don't declare the variable type, compilation error be thrown.
+ * This is the special rule of the TypeScript compiler.
+ *
+ * ```typescript
+ * // MUST DECLARE THE VARIABLE TYPE
+ * const func: typia.AssertionGuard<number> = typia.createAssertGuard<number>();
+ *
+ * // IF NOT, COMPILATION ERROR BE OCCURED
+ * const func = typia.createAssertGuard<number>();
+ * ```
+ *
+ * > *Assertions require every name in the call target to be declared with an*
+ * > *explicit type annotation.*
+ *
+ * @returns Nothing until you configure the generic argument `T`
+ * @throws compile error
+ *
+ * @author Jeongho Nam - https://github.com/samchon
+ */
+export function createAssertGuard<T>(): (input: unknown) => AssertionGuard<T>;
+
+/**
+ * @internal
+ */
+export function createAssertGuard<T>(): (input: unknown) => AssertionGuard<T> {
+    halt("createAssertGuard");
+}
+Object.assign(createAssertGuard, assertGuard);
+
 /**
  * Creates a reusable {@link is} function.
  *
@@ -543,6 +732,69 @@ export function createAssertEquals<T>(): (input: unknown) => T {
 }
 Object.assign(createAssertEquals, assertEquals);
 
+/**
+ * Creates a reusable {@link assertGuardEquals} function.
+ *
+ * Note that, you've to declare the variable type of the factory function caller
+ * like below. If you don't declare the variable type, compilation error be thrown.
+ * This is the special rule of the TypeScript compiler.
+ *
+ * ```typescript
+ * // MUST DECLARE THE VARIABLE TYPE
+ * const func: typia.AssertionGuard<number> = typia.createAssertGuardEquals<number>();
+ *
+ * // IF NOT, COMPILATION ERROR BE OCCURED
+ * const func = typia.createAssertGuardEquals<number>();
+ * ```
+ *
+ * > *Assertions require every name in the call target to be declared with an*
+ * > *explicit type annotation.*
+ *
+ * @danger You must configure the generic argument `T`
+ * @returns Nothing until you configure the generic argument `T`
+ * @throws compile error
+ *
+ * @author Jeongho Nam - https://github.com/samchon
+ */
+export function createAssertGuardEquals(): never;
+
+/**
+ * Creates a reusable {@link assertGuardEquals} function.
+ *
+ * Note that, you've to declare the variable type of the factory function caller
+ * like below. If you don't declare the variable type, compilation error be thrown.
+ * This is the special rule of the TypeScript compiler.
+ *
+ * ```typescript
+ * // MUST DECLARE THE VARIABLE TYPE
+ * const func: typia.AssertionGuard<number> = typia.createAssertGuardEquals<number>();
+ *
+ * // IF NOT, COMPILATION ERROR BE OCCURED
+ * const func = typia.createAssertGuardEquals<number>();
+ * ```
+ *
+ * > *Assertions require every name in the call target to be declared with an*
+ * > *explicit type annotation.*
+ *
+ * @returns Nothing until you configure the generic argument `T`
+ * @throws compile error
+ *
+ * @author Jeongho Nam - https://github.com/samchon
+ */
+export function createAssertGuardEquals<T>(): (
+    input: unknown,
+) => AssertionGuard<T>;
+
+/**
+ * @internal
+ */
+export function createAssertGuardEquals<T>(): (
+    input: unknown,
+) => AssertionGuard<T> {
+    halt("createAssertGuardEquals");
+}
+Object.assign(createAssertGuardEquals, assertGuardEquals);
+
 /**
  * Creates a reusable {@link equals} function.
  *