Upgrade eslint

.eslintrc

@@ -13,6 +13,7 @@
     "@typescript-eslint/no-use-before-define": "off",
     "@typescript-eslint/no-non-null-assertion": "off",
     "@typescript-eslint/no-empty-interface": "off",
+    "@typescript-eslint/ban-ts-ignore": "off",
     "jsx-a11y/anchor-has-content": "off",
     "jsx-a11y/anchor-is-valid": "off",
     "jsx-a11y/accessible-emoji": "off",

package.json

@@ -6,15 +6,15 @@
   "dependencies": {
     "@emotion/core": "^10.0.17",
     "@emotion/styled": "^10.0.17",
-    "@material-ui/core": "^4.4.0",
+    "@material-ui/core": "^4.4.3",
     "color": "^3.1.2",
-    "luxon": "^1.17.2",
-    "next": "9.0.5",
+    "luxon": "^1.19.2",
+    "next": "9.0.6",
     "react": "^16.9.0",
     "react-dom": "^16.9.0",
     "react-spring": "^8.0.27",
     "smoothscroll-polyfill": "^0.4.4",
-    "twemoji": "^12.1.2"
+    "twemoji": "^12.1.3"
   },
   "_moduleAliases": {
     "src": ".tsbuild/src",
@@ -54,20 +54,20 @@
     "@types/react": "^16.9.2",
     "@types/react-dom": "^16.9.0",
     "@types/smoothscroll-polyfill": "^0.3.1",
-    "@typescript-eslint/eslint-plugin": "^1.13.0",
-    "@typescript-eslint/parser": "^1.13.0",
+    "@typescript-eslint/eslint-plugin": "^2.3.1",
+    "@typescript-eslint/parser": "^2.3.1",
     "babel-eslint": "^10.0.3",
-    "babel-plugin-emotion": "^10.0.17",
+    "babel-plugin-emotion": "^10.0.19",
     "concurrently": "^4.1.2",
-    "eslint": "^5.16.0",
+    "eslint": "^6.4.0",
     "eslint-config-prettier": "^6.2.0",
-    "eslint-config-react-app": "^4.0.1",
-    "eslint-plugin-flowtype": "^2.x",
+    "eslint-config-react-app": "^5.0.2",
+    "eslint-plugin-flowtype": "3.x",
     "eslint-plugin-import": "^2.18.2",
     "eslint-plugin-jsx-a11y": "^6.2.3",
-    "eslint-plugin-prettier": "^3.1.0",
+    "eslint-plugin-prettier": "^3.1.1",
     "eslint-plugin-react": "^7.14.3",
-    "eslint-plugin-react-hooks": "^1.6.1",
+    "eslint-plugin-react-hooks": "1.x",
     "fs-extra": "^8.1.0",
     "glob": "^7.1.4",
     "jest": "^24.9.0",

scripts/lib/buildExpressionContainers.ts

@@ -21,7 +21,7 @@ const buildExpressionContainers = ({
 }: ExpressionRunnerConfig): readonly ExpressionContainer[] => {
   if (initialExpressionContainer) {
     let currentExpressionContainer: SteppedExpressionContainer = initialExpressionContainer
-    let results: ExpressionContainer[] = []
+    const results: ExpressionContainer[] = []
     const stepOptions = {
       showAllShowSteps,
       skipAlphaConvert,

scripts/lib/buildExpressionFromParams.ts

@@ -110,8 +110,7 @@ export default function buildExpressionFromParams(
   if (isVariableExpressionParams(expressionParams)) {
     return buildVariableExpression(expressionParams, true, 'default')
   } else if (isCallExpressionParams(expressionParams)) {
-    let nestedCallExpressionParams: CallExpressionParams
-    nestedCallExpressionParams =
+    const nestedCallExpressionParams: CallExpressionParams =
       expressionParams.length > 2
         ? nestCallExpressions(expressionParams)
         : expressionParams

scripts/lib/buildExpressionRunnerConfigFromShorthand.ts

@@ -99,7 +99,7 @@ function mergeWithDefault<
   A extends Record<string, any>,
   B extends Record<string, any>
 >(base: A, defaults: B): A & B {
-  let result: Record<string, any> = { ...base }
+  const result: Record<string, any> = { ...base }
   Object.keys(defaults).forEach(key => {
     if (base[key] === undefined) {
       result[key] = defaults[key]

src/hooks/useConditionalCards.ts

@@ -4,10 +4,7 @@ import EpisodeContext from 'src/components/EpisodeContext'
 import { EpisodeCardListType } from 'src/components/EpisodeCardList'
 import locale from 'src/lib/locale'
 
-const getNextYesNoQuizIndex = (
-  cards: EpisodeCardListType,
-  fromIndex: number = 0
-) => {
+const getNextYesNoQuizIndex = (cards: EpisodeCardListType, fromIndex = 0) => {
   for (let i = fromIndex; i < cards.length; i++) {
     if (cards[i].type === 'yesNoQuiz') {
       return i

src/hooks/useInterval.ts

@@ -18,7 +18,7 @@ export default function useInterval(
       savedCallback.current && savedCallback.current()
     }
     if (delay !== null) {
-      let id = setInterval(tick, delay)
+      const id = setInterval(tick, delay)
       return () => clearInterval(id)
     }
   }, [delay])