Add Parse.defaulted

src/test/parse.test.ts

@@ -176,6 +176,14 @@ describe(Parse.nullable, () => {
   });
 });
 
+describe(Parse.defaulted, () => {
+  test("Parses uses a default value for undefined params", () => {
+    expect(Parse.defaulted(Parse.string, "default!")(undefined)).toBe(
+      "default!",
+    );
+  });
+});
+
 describe(Parse.nan, () => {
   test("Parses NaN", () => {
     expect(Parse.nan(Number.NaN)).toBe(Number.NaN);
@@ -189,7 +197,7 @@ describe(Parse.nan, () => {
   });
 });
 
-class TestClass { }
+class TestClass {}
 
 describe(Parse.instanceOf, () => {
   test("Parses instances of a class", () => {
@@ -206,7 +214,7 @@ describe(Parse.instanceOf, () => {
 
   test("Throws an error when parsing an instance of a different class", () => {
     const testClass = new TestClass();
-    expect(() => Parse.instanceOf(class AnotherClass { })(testClass)).toThrow(
+    expect(() => Parse.instanceOf(class AnotherClass {})(testClass)).toThrow(
       ParseError,
     );
   });