chore: using eslint instead of tslint

.eslintignore

@@ -0,0 +1,13 @@
+# from .gitignore
+node_modules/
+coverage/
+dist/
+.idea
+.cache
+*.tgz
+.DS_Store
+esm
+esnext
+
+# custom ignore pattern
+*.html

.eslintrc.json

@@ -0,0 +1,50 @@
+{
+  "plugins": ["@typescript-eslint"],
+  "parser": "@typescript-eslint/parser",
+  "extends": [
+    "plugin:react/recommended",
+    "plugin:@typescript-eslint/recommended",
+    "prettier"
+  ],
+  "globals": {
+    "Atomics": "readonly",
+    "SharedArrayBuffer": "readonly"
+  },
+  "rules": {
+    "@typescript-eslint/explicit-member-accessibility": [
+      "error",
+      {
+        "accessibility": "no-public",
+        "overrides": {
+          "parameterProperties": "explicit"
+        }
+      }
+    ],
+    "@typescript-eslint/explicit-function-return-type": "off",
+    "@typescript-eslint/no-non-null-assertion": "off",
+    "@typescript-eslint/no-parameter-properties": "off",
+    "@typescript-eslint/no-use-before-define": ["error", { "functions": false, "classes": false }],
+    "@typescript-eslint/no-explicit-any": "off",
+    "@typescript-eslint/no-var-requires": "off",
+    "@typescript-eslint/ban-ts-comment": "off",
+    "no-console": ["error", { "allow": ["warn", "error"] }]
+  },
+  "settings": {
+    "react": {
+      "version": "detect"
+    }
+  },
+  "env": {
+    "browser": true,
+    "es6": true
+  },
+  "parserOptions": {
+    "project": "./tsconfig.json",
+    "extraFileExtensions": [".html"],
+    "ecmaFeatures": {
+      "jsx": true
+    },
+    "ecmaVersion": 2018,
+    "sourceType": "module"
+  }
+}

package.json

@@ -12,9 +12,11 @@
     "build": "yarn build:esm && yarn build:cjs",
     "build:esm": "rm -rf dist/esm && tsc -p src/tsconfig.json --module es2015 --target es5 --outDir dist/esm",
     "build:cjs": "rm -rf dist/cjs && tsc -p src/tsconfig.json --module commonjs --target es5 --outDir dist/cjs",
-    "lint": "tslint -c tslint.json -p src/tsconfig.json",
     "start": "webpack-dev-server --config ./tools/webpack.config.js --progress --color",
-    "test": "NODE_ENV=test jest --no-cache --ci"
+    "test": "NODE_ENV=test jest --no-cache --ci",
+    "lint": "yarn lint:eslint && yarn lint:tsc",
+    "lint:eslint": "eslint . --ext .ts,.tsx --fix --max-warnings 0",
+    "lint:tsc": "tsc -p ./tsconfig.json --noEmit"
   },
   "repository": {
     "type": "git",
@@ -28,8 +30,13 @@
     "@types/sinon": "^9.0.0",
     "@types/sinon-chai": "^3.2.3",
     "@types/webpack": "^4.41.0",
+    "@typescript-eslint/eslint-plugin": "^4.19.0",
+    "@typescript-eslint/parser": "^4.19.0",
     "browser-resolve": "^2.0.0",
     "codecov": "^3.6.1",
+    "eslint": "^7.22.0",
+    "eslint-config-prettier": "^8.1.0",
+    "eslint-plugin-react": "^7.23.1",
     "fork-ts-checker-webpack-plugin": "^6.0.0",
     "happypack": "^5.0.1",
     "html-webpack-plugin": "^5.0.0",
@@ -46,18 +53,13 @@
     "standard": "^16.0.0",
     "ts-jest": "^26.0.0",
     "ts-loader": "^8.0.0",
-    "tslint": "^5.20.1",
-    "tslint-config-prettier": "^1.18.0",
-    "tslint-eslint-rules": "^5.4.0",
-    "tslint-react": "^4.1.0",
-    "tslint-sonarts": "^1.9.0",
-    "typescript": "^3.7.3",
+    "typescript": "^4.2.0",
     "webpack": "^5.0.0",
     "webpack-cli": "^4.0.0",
     "webpack-dev-server": "^3.9.0"
   },
   "dependencies": {
-    "tslib": "^2.0.0",
+    "tslib": "^2.1.0",
     "use-constant": "^1.0.0"
   },
   "lint-staged": {
@@ -67,7 +69,7 @@
     ],
     "*.@(ts|tsx)": [
       "prettier --write",
-      "tslint -c tslint.json --fix"
+      "yarn lint:eslint"
     ]
   },
   "prettier": {

src/__test__/find.ts

@@ -1,5 +1,5 @@
 import { ReactTestInstance } from 'react-test-renderer'
 
-export function find(node: ReactTestInstance, type: string) {
+export function find(node: ReactTestInstance, type: string): ReactTestInstance {
   return node.find((node) => node.type === type)
 }

src/__test__/use-event-callback.spec.tsx

@@ -87,7 +87,7 @@ describe('useEventCallback specs', () => {
     const factory = (event$: Observable<React.MouseEvent<HTMLButtonElement>>, state$: Observable<number>) =>
       event$.pipe(
         withLatestFrom(state$),
-        map(([_, state]) => {
+        map(([, state]) => {
           return state + value
         }),
         delay(timeToDelay),
@@ -130,7 +130,7 @@ describe('useEventCallback specs', () => {
     ): Observable<number> =>
       event$.pipe(
         combineLatest(inputs$),
-        map(([_, [count]]) => {
+        map(([, [count]]) => {
           return value + count
         }),
         delay(timeToDelay),