fix tsconfig to be strict in test

test/focus-lens.test.tsx

@@ -3,6 +3,8 @@ import React from 'react'
 import * as rtl from '@testing-library/react'
 import { focus } from '../src/index'
 
+const succ = (input: number) => input + 1
+
 it('focus on an atom works', async () => {
   const bigAtom = atom({ a: 0 })
   const aAtom = focus(bigAtom, optic => optic.prop('a'))
@@ -14,7 +16,7 @@ it('focus on an atom works', async () => {
       <>
         <div>bigAtom: {JSON.stringify(bigAtomValue)}</div>
         <div>count: {count}</div>
-        <button onClick={() => setCount(c => c + 1)}>button</button>
+        <button onClick={() => setCount(succ)}>button</button>
       </>
     )
   }

test/focus-prism.test.tsx

@@ -4,7 +4,7 @@ import * as rtl from '@testing-library/react'
 import { focus } from '../src/index'
 
 it('updates prisms', async () => {
-  const bigAtom = atom<{ a: number | undefined }>({ a: 5 })
+  const bigAtom = atom<{ a?: number }>({ a: 5 })
   const aAtom = focus(bigAtom, optic => optic.prop('a').optional())
 
   const Counter: React.FC = () => {

tsconfig.json

@@ -1,13 +1,12 @@
 {
-  "include": ["src", "types"],
+  "include": ["src", "types", "test"],
   "compilerOptions": {
     "module": "esnext",
     "lib": ["dom", "esnext"],
     "importHelpers": true,
     "declaration": true,
     "sourceMap": true,
     "rootDir": "./src",
-    "strict": true,
     "strictNullChecks": true,
     "noUnusedLocals": true,
     "noUnusedParameters": true,