Prettify with Prettier v2 and no trailing commas

.prettierrc

@@ -1,3 +1,4 @@
 {
-  "singleQuote": true
+  "singleQuote": true,
+  "trailingComma": "none"
 }

README.md

@@ -193,7 +193,7 @@ Feature parity with Scientist is _not_ a goal.
 
 - TypeScript strict option
 - No classes
-- Prettier with single quotes
+- Prettier 2 with single quotes and no trailing commas
 - No ESLint warnings/errors
 - All tests pass
 - No dependencies (other than devDependencies)

src/index.spec.ts

@@ -519,7 +519,7 @@ describe('experiment', () => {
 
 describe('experimentAsync', () => {
   const sleep = (ms: number): Promise<void> =>
-    new Promise(resolve => setTimeout(resolve, ms));
+    new Promise((resolve) => setTimeout(resolve, ms));
 
   describe('when functions are equivalent', () => {
     const publishMock: jest.Mock<

src/index.ts

@@ -145,17 +145,17 @@ export function experimentAsync<TParams extends any[], TResult>({
     if (isEnabled) {
       // Run in parallel
       [candidateResult, controlResult] = await Promise.all([
-        candidate(...args).catch(e => {
+        candidate(...args).catch((e) => {
           candidateError = e;
           return undefined;
         }),
-        control(...args).catch(e => {
+        control(...args).catch((e) => {
           controlError = e;
           return undefined;
         })
       ]);
     } else {
-      controlResult = await control(...args).catch(e => {
+      controlResult = await control(...args).catch((e) => {
         controlError = e;
         return undefined;
       });