Get eslint running with typescript

Author: bkeepers

.eslintrc.cjs

@@ -1,18 +1,18 @@
 module.exports = {
-  env: {
-    browser: true,
-    es2021: true,
-    node: true
-  },
-  extends: 'eslint:recommended',
+  root: true,
+  env: { es2023: true },
+  parser: '@typescript-eslint/parser',
   parserOptions: {
     ecmaVersion: 'latest',
-    sourceType: 'module'
+    sourceType: 'module',
+    project: ['./tsconfig.json']
   },
+  plugins: ['@typescript-eslint'],
+  extends: ['eslint:recommended', 'plugin:@typescript-eslint/recommended'],
   rules: {
-    indent: ['error', 2],
-    'linebreak-style': ['error', 'unix'],
-    quotes: ['error', 'single'],
-    semi: ['error', 'never']
-  }
+    '@typescript-eslint/no-explicit-any': 'off',
+    '@typescript-eslint/no-unused-vars': ['warn', { argsIgnorePattern: '^_' }],
+    'no-extra-semi': 'warn'
+  },
+  ignorePatterns: ['dist/', 'node_modules/']
 }

package.json

@@ -18,6 +18,8 @@
   "devDependencies": {
     "@types/mocha": "^10.0.10",
     "@types/node": "^20.10.6",
+    "@typescript-eslint/eslint-plugin": "^7.0.0",
+    "@typescript-eslint/parser": "^7.0.0",
     "c8": "^7.11.3",
     "eslint": "^8.18.0",
     "mocha": "^10.0.0",

src/astronomy/index.ts

@@ -162,7 +162,7 @@ const astro = (time: Date): AstroData => {
   // in the more convenient unit of degrees per hour.
   const dTdHour = 1 / (24 * 365.25 * 100)
   Object.keys(polynomials).forEach((name) => {
-    ;(result as any)[name] = {
+    (result as any)[name] = {
       value: modulus(polynomial(polynomials[name], T(time)), 360.0),
       speed: derivativePolynomial(polynomials[name], T(time)) * dTdHour
     }

src/index.ts

@@ -1,10 +1,6 @@
 import harmonics from './harmonics/index.js'
 import type { HarmonicConstituent } from './harmonics/index.js'
-import type {
-  TimelinePoint,
-  Extreme,
-  ExtremesOptions
-} from './harmonics/prediction.js'
+import type { TimelinePoint, Extreme } from './harmonics/prediction.js'
 
 export interface TidePredictionOptions {
   phaseKey?: string
@@ -53,7 +49,7 @@ const tidePredictionFactory = (
   if (typeof options !== 'undefined') {
     Object.keys(harmonicsOptions).forEach((key) => {
       if (typeof options[key as keyof TidePredictionOptions] !== 'undefined') {
-        ;(harmonicsOptions as any)[key] =
+        (harmonicsOptions as any)[key] =
           options[key as keyof TidePredictionOptions]
       }
     })