add jsconfig. convert .eslintrc from JSON to JS

.eslintrc.js

@@ -0,0 +1,101 @@
+'use strict'
+//eslint-disable-next-line no-implicit-globals
+const m = 'Use arrow fn instead.'
+
+//eslint-disable-next-line no-undef
+module.exports = {
+	env: {
+		browser: true,
+		es2021: true
+	},
+	extends: 'eslint:recommended',
+	parserOptions: {
+		ecmaVersion: 'latest'
+	},
+	rules: {
+		'no-magic-numbers': [
+			'warn',
+			{
+				ignore: [
+					-1,
+					0,
+					1,
+					2
+				],
+				ignoreArrayIndexes: true,
+				ignoreDefaultValues: true,
+				enforceConst: true
+			}
+		],
+		'no-unused-vars': [
+			'warn',
+			{
+				varsIgnorePattern: '^_$',
+				argsIgnorePattern: '^_$'
+			}
+		],
+		'no-param-reassign': 'error',
+		'no-implicit-globals': [
+			'error',
+			{
+				lexicalBindings: true
+			}
+		],/*
+		'no-restricted-syntax': [
+			'error',
+			{
+				selector: 'FunctionDeclaration',
+				message: m
+			},
+			{
+				selector: 'FunctionExpression',
+				message: m
+			}
+		],*/
+		'no-empty-function': 'error',
+		'no-loop-func': 'error',
+		'no-lone-blocks': 'error',
+		'no-constant-binary-expression': 'error',
+		'no-self-compare': 'error',
+		'no-unmodified-loop-condition': 'error',
+		'no-unreachable-loop': 'error',
+		'no-extra-label': 'error',
+		'no-else-return': [
+			'error',
+			{
+				'allowElseIf': false
+			}
+		],
+		'require-atomic-updates': 'error',
+		'no-eval': 'error',
+		'no-implied-eval': 'error',
+		'dot-notation': 'error',
+		'no-array-constructor': 'error',
+		'max-depth': 'warn',
+		'max-nested-callbacks': [
+			'error',
+			3
+		],
+		'max-params': [
+			'error',
+			4
+		],
+		'indent': [
+			'error',
+			'tab'
+		],
+		'linebreak-style': [
+			'error',
+			'unix'
+		],
+		'no-template-curly-in-string': 'warn',
+		'quotes': [
+			'error',
+			'single'
+		],
+		'semi': [
+			'error',
+			'never'
+		]
+	}
+}

jsconfig.json

@@ -0,0 +1,12 @@
+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "module": "None",
+    "checkJs": true,
+    "strict": true,
+    "noUncheckedIndexedAccess": true
+  },
+  "exclude": [
+    "node_modules"
+  ]
+}

src/main.js

@@ -1,4 +1,3 @@
-//@ts-check
 'use strict'
 // global/public, for debugging/testing purposes
 /*exported RGBDR_anim*/
@@ -21,6 +20,7 @@ const RGBDR_anim = (() => {
 	/**
 	@param {number} n
 	*/
+	//eslint-disable-next-line no-restricted-syntax
 	const range = function*(n) {
 		for (let i = 0; i < n; i++)
 			yield i