Emit .d.ts file in test

Author: ahejlsberg

tests/baselines/reference/strictFunctionTypes1.js

@@ -23,3 +23,20 @@ var x1 = f1(fo, fs); // (x: string) => void
 var x2 = f2("abc", fo, fs); // "abc"
 var x3 = f3("abc", fo, fx); // "abc" | "def"
 var x4 = f4(fo, fs); // Func<string>
+
+
+//// [strictFunctionTypes1.d.ts]
+declare function f1<T>(f1: (x: T) => void, f2: (x: T) => void): (x: T) => void;
+declare function f2<T>(obj: T, f1: (x: T) => void, f2: (x: T) => void): T;
+declare function f3<T>(obj: T, f1: (x: T) => void, f2: (f: (x: T) => void) => void): T;
+interface Func<T> {
+    (x: T): void;
+}
+declare function f4<T>(f1: Func<T>, f2: Func<T>): Func<T>;
+declare function fo(x: Object): void;
+declare function fs(x: string): void;
+declare function fx(f: (x: "def") => void): void;
+declare const x1: (x: string) => void;
+declare const x2 = "abc";
+declare const x3: string;
+declare const x4: Func<string>;

tests/cases/compiler/strictFunctionTypes1.ts

@@ -1,4 +1,5 @@
 // @strict: true
+// @declaration: true
 
 declare function f1<T>(f1: (x: T) => void, f2: (x: T) => void): (x: T) => void;
 declare function f2<T>(obj: T, f1: (x: T) => void, f2: (x: T) => void): T;