Update react-scripts and Typescript to version 4

.gitignore

@@ -21,6 +21,7 @@
 .env.development.local
 .env.test.local
 .env.production.local
+.eslintcache
 
 npm-debug.log*
 yarn-debug.log*

package.json

@@ -6,7 +6,8 @@
     "coverageReporters": [
       "text",
       "lcov"
-    ]
+    ],
+    "resetMocks": false
   },
   "dependencies": {
     "@babel/cli": "^7.10.1",
@@ -29,7 +30,7 @@
     "@types/react-dom": "^16.9.5",
     "@types/react-helmet": "^6.0.0",
     "@types/react-router-config": "^5.0.1",
-    "@types/react-router-dom": "^5.1.3",
+    "@types/react-router-dom": "^5.1.7",
     "axios": "^0.21.1",
     "babel-plugin-transform-assets": "^1.0.2",
     "bootstrap": "^4.5.0",
@@ -50,12 +51,12 @@
     "react-helmet": "^6.0.0",
     "react-hook-form": "^5.6.1",
     "react-router-dom": "^5.1.2",
-    "react-scripts": "^3.4.3",
+    "react-scripts": "^4.0.1",
     "serialize-javascript": "^3.1.0",
     "slate": "^0.58.3",
     "slate-history": "^0.58.4",
     "slate-react": "^0.58.4",
-    "typescript": "~3.9.7"
+    "typescript": "^4.1.3"
   },
   "scripts": {
     "start": "react-scripts start",
@@ -67,7 +68,16 @@
     "size": "npm run build && size-limit"
   },
   "eslintConfig": {
-    "extends": "react-app"
+    "extends": [
+      "react-app",
+      "prettier"
+    ],
+    "parserOptions": {
+      "ecmaVersion": 2018
+    },
+    "env": {
+      "es2017": true
+    }
   },
   "browserslist": {
     "production": [
@@ -94,7 +104,6 @@
     "@types/scheduler": "^0.16.1",
     "@types/serialize-javascript": "^1.5.0",
     "core-js": "^3.6.5",
-    "eslint": "^6.8.0",
     "eslint-config-prettier": "^6.10.0",
     "glob": "^7.1.6",
     "jest-mock-axios": "^4.0.0",

scripts/generate-manifest.js

@@ -9,7 +9,7 @@
 const fs = require("fs");
 const path = require("path");
 
-const configPath = path.resolve(__dirname, "..", "src", "config.ts");
+const configPath = path.resolve(__dirname, "..", "src", "config", "config.json");
 const manifestPath = path.resolve(
   __dirname,
   "..",
@@ -21,11 +21,7 @@ console.log("Loading config from", configPath);
 
 // Because TypeScript uses ES6 modules, we can't exactly load the contents of the config file
 // So instead, we read the source and evaluate it.
-const config = Function(
-  `"use strict"; return ${fs
-    .readFileSync(configPath, "utf-8")
-    .replace("export default", "")}`
-)();
+const config = JSON.parse(fs.readFileSync(configPath, "utf-8"))
 
 console.log("Loaded config:");
 console.dir(config);

src/auth/__tests__/Auth.unit.test.ts

@@ -1,12 +1,13 @@
 import { User } from "../../shared/types";
 import { testAdmin, testUser } from "../../shared/test-utils";
 import { authReducer, CSRF_COOKIE } from "../Auth";
+import Cookies from "js-cookie";
 
 describe("authReducer", () => {
   let authState: { user: User | null; csrfToken: string | null };
 
   beforeAll(() => {
-    window.document.cookie = `${CSRF_COOKIE}=csrf`;
+    Cookies.set(CSRF_COOKIE, 'csrf')
   });
 
   beforeEach(() => {
@@ -22,7 +23,7 @@ describe("authReducer", () => {
   });
 
   afterAll(() => {
-    delete window.document.cookie;
+    Cookies.remove(CSRF_COOKIE)
   });
 
   describe("action:login", () => {

src/auth/__tests__/AuthProvider.unit.test.tsx

@@ -14,13 +14,14 @@ import { APIResponseFailure, APIError } from "../../shared/types";
 
 // for spies
 import * as _a from "../Auth";
+import Cookies from "js-cookie";
 
 describe("AuthProvider", () => {
   let result: HookResult<AuthContext>;
   let auth: AuthContext;
 
   beforeAll(() => {
-    window.document.cookie = `${CSRF_COOKIE}=csrf`;
+    Cookies.set(CSRF_COOKIE, 'csrf')
   });
 
   beforeEach(() => {
@@ -36,7 +37,7 @@ describe("AuthProvider", () => {
   });
 
   afterAll(() => {
-    delete window.document.cookie;
+    Cookies.remove(CSRF_COOKIE)
   });
 
   it("provides access to all fields in interface (sanity check)", () => {

src/config/config.json

@@ -0,0 +1,39 @@
+{
+  "baseurl": "http://mathnews.uwaterloo.ca",
+  "title": "mathNEWS",
+  "description": "UWaterloo's Bastion of Erudite Thought",
+  "themeColor": "#000000",
+  "locale": "en_CA",
+  "alternateLocales": [],
+  "icons": {
+    "favicon": {
+      "src": "favicon.ico",
+      "type": "image/x-icon",
+      "sizes": "64x64 32x32 16x16"
+    },
+    "touchIcon": {
+      "src": "logo192.png",
+      "type": "image/png",
+      "sizes": "192x192"
+    },
+    "largeIcon": {
+      "src": "logo512.png",
+      "type": "image/png",
+      "sizes": "512x512"
+    }
+  },
+  "seo": {
+    "image": "",
+    "twitter": {
+      "card": "summary_large_image",
+      "site": "@UWmathNEWS"
+    }
+  },
+  "manifest": {
+    "fullName": "",
+    "start_url": ".",
+    "display": "standalone",
+    "backgroundColor": "#ffffff"
+  },
+  "googleSiteVerification": ""
+}

src/config/index.ts

@@ -0,0 +1,2 @@
+import config from "./config.json";
+export default config;

src/dash/EditorPage.tsx

@@ -30,10 +30,14 @@ const getEditorRequestState = (
   }
 };
 
+interface EditorPageRouteParams {
+  articleId: string
+}
+
 const ARTICLE_SAVE_DELAY_MSECS = 10000;
 
 const EditorPage: React.FC<RouteComponentProps> = (props) => {
-  const { articleId } = useParams();
+  const { articleId } = useParams<EditorPageRouteParams>();
 
   const [lastSaved, setLastSaved] = useState<Date>(new Date());
 

src/dash/issues/DashIssueDetail.tsx

@@ -23,8 +23,12 @@ const columns: Column<Article>[] = [
   },
 ];
 
+interface DashIssueDetailRouteParams {
+  issueId: string
+}
+
 const DashIssueDetail: React.FC<RouteComponentProps> = (props) => {
-  const { issueId } = useParams();
+  const { issueId } = useParams<DashIssueDetailRouteParams>();
 
   const [issue, issueError, issueReqInfo] = useAPI(
     useCallback(() => {

src/shared/components/ActionLink.tsx

@@ -15,11 +15,8 @@ import type { LinkProps } from "react-router-dom";
 const ActionLink = React.forwardRef<HTMLAnchorElement, LinkProps>(
   ({ className, children, ...props }, ref) => {
     return (
-      // Link forwards its refs (see
-      // https://github.com/ReactTraining/react-router/blob/master/packages/react-router-dom/docs/api/Link.md#innerref-refobject)
-      // but this is not recognized by the provided typings, so we must bodge it with a cast
       <Link
-        ref={ref as React.Ref<Link>}
+        ref={ref}
         className={`ActionLink ${className || ""}`}
         {...props}
       >

src/shared/components/Button.tsx

@@ -49,7 +49,7 @@ export const LinkButton = React.forwardRef<
 >(({ variant, className, children, ...props }, ref) => {
   return (
     <Link
-      ref={ref as React.Ref<Link>}
+      ref={ref}
       {...(props as LinkProps)}
       className={`btn btn-primary Button Button-${variant} ${className || ""}`}
     >

src/shared/components/Loader.tsx

@@ -8,7 +8,7 @@ interface LoaderProps {
   hideFromScreenreaders?: boolean;
 }
 
-export default (props: LoaderProps) => {
+const Loader: React.FC<LoaderProps> = (props: LoaderProps) => {
   if (props.variant === "spinner") {
     return (
       <div className={`d-flex justify-content-center ${props.className}`}>
@@ -32,3 +32,5 @@ export default (props: LoaderProps) => {
   }
   return <></>;
 };
+
+export default Loader;

src/shared/contexts/ToastContext.tsx

@@ -20,7 +20,7 @@ export interface ToastManager {
   addToasts: (toasts: ToastMessage[]) => void;
 }
 
-const ToastManager = createContext<ToastManager>({
+const ToastManagerContext = createContext<ToastManager>({
   toasts: [],
   setToasts: () => {},
   setToastsHeuristically: () => {},
@@ -67,10 +67,10 @@ export const ToastProvider: React.FC = props => {
     }).filter(t => t._delay === undefined || t._delay > 100))); // 150ms is the default bootstrap anim duration
 
   return (
-    <ToastManager.Provider value={{ toasts, setToasts, setToastsHeuristically, addToasts }}>
+    <ToastManagerContext.Provider value={{ toasts, setToasts, setToastsHeuristically, addToasts }}>
       {props.children}
-    </ToastManager.Provider>
+    </ToastManagerContext.Provider>
   )
 };
 
-export const useToast = () => useContext(ToastManager);
+export const useToast = () => useContext(ToastManagerContext);

src/shared/errors.ts

@@ -16,6 +16,11 @@ const errorsProxyFactory = (errors: { [key: string]: any }): ErrorsProxy => {
   return new Proxy(proxiedErrors, {
     get(_, prop: string) {
       if (prop === "__typeof__") return "proxy";
+      // HACK: react-refresh scans every export and uses $$typeof to determine
+      // if it's a React component that it needs to process. Without this, we'll
+      // throw an error here which breaks initialization.
+      // TODO: Consider returning undefined instead of throwing an error in the "not found" case.
+      if (prop === "$$typeof") return undefined;
       if (prop.includes(" ")) return prop;
       if (prop in memo) return memo[prop];
 

src/shared/form/PasswordField.tsx

@@ -29,8 +29,9 @@ export const validatePassword = {
 const PasswordField = React.forwardRef<
   FormControlElementType,
   PasswordFieldProps<any>
->(({ state = useState<boolean>(false), context, ...props }, ref) => {
-  const [showPassword, setShowPassword] = state;
+>(({ state, context, ...props }, ref) => {
+  const defaultState = useState<boolean>(false)
+  const [showPassword, setShowPassword] = state ?? defaultState;
   return (
     <Field
       type={showPassword ? "text" : "password"}

tsconfig.json

@@ -1,7 +1,11 @@
 {
   "compilerOptions": {
     "target": "es5",
-    "lib": ["dom", "dom.iterable", "esnext"],
+    "lib": [
+      "dom",
+      "dom.iterable",
+      "esnext"
+    ],
     "allowJs": true,
     "skipLibCheck": true,
     "esModuleInterop": true,
@@ -13,8 +17,11 @@
     "resolveJsonModule": true,
     "isolatedModules": true,
     "noEmit": true,
-    "jsx": "react",
-    "downlevelIteration": true
+    "jsx": "react-jsx",
+    "downlevelIteration": true,
+    "noFallthroughCasesInSwitch": true
   },
-  "include": ["src"]
+  "include": [
+    "src"
+  ]
 }