Fixed 20.7

Author: mattpocock

src/04-generics-advanced/20.7-working-around-partial-inference.problem.ts

@@ -2,7 +2,7 @@ import { Equal, Expect } from "../helpers/type-utils";
 
 export const makeSelectors = <
   TSource,
-  TSelectors extends Record<string, (source: TSource) => any> = {},
+  TSelectors extends Record<string, (source: TSource) => any>,
 >(
   selectors: TSelectors,
 ) => {
@@ -35,11 +35,11 @@ const selectors = makeSelectors<Source>({
 });
 
 type tests = [
-  Expect<Equal<typeof selectors["getFullName"], (source: Source) => string>>,
+  Expect<Equal<(typeof selectors)["getFullName"], (source: Source) => string>>,
   Expect<
-    Equal<typeof selectors["getFirstAndLastName"], (source: Source) => string>
+    Equal<(typeof selectors)["getFirstAndLastName"], (source: Source) => string>
   >,
   Expect<
-    Equal<typeof selectors["getFirstNameLength"], (source: Source) => number>
+    Equal<(typeof selectors)["getFirstNameLength"], (source: Source) => number>
   >,
 ];

src/04-generics-advanced/20.7-working-around-partial-inference.solution.ts

@@ -3,7 +3,7 @@ import { Equal, Expect } from "../helpers/type-utils";
 export const makeSelectors =
   <TSource = "makeSelectors expects to be passed a type argument">() =>
   <TSelectors extends Record<string, (source: TSource) => any>>(
-    selectors: TSelectors
+    selectors: TSelectors,
   ) => {
     return selectors;
   };
@@ -22,11 +22,11 @@ const selectors = makeSelectors<Source>()({
 });
 
 type tests = [
-  Expect<Equal<typeof selectors["getFullName"], (source: Source) => string>>,
+  Expect<Equal<(typeof selectors)["getFullName"], (source: Source) => string>>,
   Expect<
-    Equal<typeof selectors["getFirstAndLastName"], (source: Source) => string>
+    Equal<(typeof selectors)["getFirstAndLastName"], (source: Source) => string>
   >,
   Expect<
-    Equal<typeof selectors["getFirstNameLength"], (source: Source) => number>
-  >
+    Equal<(typeof selectors)["getFirstNameLength"], (source: Source) => number>
+  >,
 ];