simplytyped - npm Package Compare versions

Comparing version 0.1.2 to 0.1.3

package.json

 {
     "name": "simplytyped",
-    "version": "0.1.2",
+    "version": "0.1.3",
     "description": "yet another Typescript type library for advanced types",
@@ -5,0 +5,0 @@ "main": "src/index.ts",

README.md

@@ -96,2 +96,11 @@ # SimplyTyped
 
+### IsType
+Given a base type and a value, check to see if value matches the base type.
+Useful for checking if something is an instance of a class.
+```ts
+class Thing { x: string };
+type x = IsType<Thing, { x: string }> // => True
+type y = IsType<Thing, { y: number }> // => False
+```
+
 ## Objects
@@ -98,0 +107,0 @@

src/types.ts

@@ -28,2 +28,3 @@ // Conditionals
 
+export type IsType<T, X> = ReallyTrue<HasKey<T, Keys<X>>>;
 export type IsAny<T> = IsNever<HasKey<T, string>>;
@@ -30,0 +31,0 @@ export type IsArray<T> = ReallyTrue<HasKey<T, ArrayPrototypeKeys>>;

test/prototypes.ts

 import test from 'ava';
-import { IsAny, IsArray, IsBoolean, IsFunction, IsNumber, IsObject, IsString, True, False } from '../src/index';
+import { IsAny, IsArray, IsBoolean, IsFunction, IsNumber, IsObject, IsString, IsType, True, False } from '../src/index';
 
-function assert<T, U extends T>(t: { pass: any }) { t.pass() }
+function assert<T, U extends T>(t: { pass: any }) { t.pass(); }
 
-class Class { public x = 'hey' };
+class Class { x = 'hey'; }
 const inst = new Class();
@@ -71,3 +71,3 @@
     assert<IsFunction<func>, True>(t);
-    assert<IsFunction<Function>, True>(t);
+    assert<IsFunction<Function>, True>(t); // tslint:disable-line
 
@@ -83,3 +83,3 @@ // TODO: this should probably be False
     assert<IsFunction<cls>, False>(t);
-})
+});
 
@@ -102,2 +102,9 @@ test('Can check if a type is an object', t => {
 
+test('Can check if type is the same as another type', t => {
+    assert<IsType<Class, cls>, True>(t);
+    assert<IsType<string, str>, True>(t);
+
+    assert<IsType<Class, str>, False>(t);
+});
+
 test('Can check if a type is any', t => {
@@ -104,0 +111,0 @@ assert<IsAny<any>, True>(t);

No alert changes

Improved metrics

Total package byte prevSize

33801

increased by1.69%

Lines of code

615

increased by0.99%

Number of lines in readme file

335

increased by2.76%

No dependency changes