chore: Add formatting and linting configs.

.eslintignore

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+.DS_Store
+coverage
+dist
+node_modules

.eslintrc.js

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+const prettierConf = require('./prettier.config');
+
+module.exports = {
+  env: {
+    browser: true,
+    es6: true,
+    node: true,
+  },
+  extends: [
+    'airbnb-base',
+    'eslint:recommended',
+    'plugin:@typescript-eslint/eslint-recommended',
+    'prettier',
+  ],
+  globals: {
+    Atomics: 'readonly',
+    SharedArrayBuffer: 'readonly',
+    tw: true,
+  },
+  parser: '@typescript-eslint/parser',
+  parserOptions: {
+    ecmaVersion: 2020,
+    ecmaFeatures: {
+      classes: true,
+      impliedStrict: true,
+      jsx: true,
+    },
+    sourceType: 'module',
+  },
+  plugins: ['prettier', '@typescript-eslint'],
+  rules: {
+    'id-length': [
+      2,
+      {
+        exceptions: ['_', 'a', 'b', 'c', 'i', 'x', 'y', 'z'],
+      },
+    ],
+    'import/extensions': 0,
+    'import/no-unresolved': [2, { caseSensitive: false }],
+    'import/prefer-default-export': 0,
+    'no-await-in-loop': 0,
+    'no-console': [
+      'error',
+      {
+        allow: ['error', 'info'],
+      },
+    ],
+    'no-case-declarations': 0,
+    'no-nested-ternary': 0,
+    'no-restricted-syntax': [
+      'error',
+      'FunctionExpression',
+      'WithStatement',
+      "BinaryExpression[operator='in']",
+    ],
+    'prettier/prettier': ['error', prettierConf],
+    '@typescript-eslint/explicit-function-return-type': 'off',
+    '@typescript-eslint/explicit-module-boundary-types': 'off',
+    '@typescript-eslint/interface-name-prefix': 'off',
+    '@typescript-eslint/no-useless-constructor': 'off',
+    '@typescript-eslint/no-explicit-any': 'off',
+  },
+  settings: {
+    'import/resolver': {
+      node: {
+        extensions: ['.js', '.ts'],
+      },
+    },
+  },
+};

.prettierignore

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+.DS_Store
+.env
+*.log
+*.pid
+*.seed
+coverage
+dist
+lib-cov
+logs
+node_modules

prettier.config.js

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+module.exports = {
+  arrowParens: 'avoid',
+  bracketSpacing: true,
+  endOfLine: 'auto',
+  overrides: [
+    {
+      files: '*.json',
+      options: {
+        printWidth: 200,
+      },
+    },
+  ],
+  printWidth: 80,
+  proseWrap: 'preserve',
+  requirePragma: false,
+  semi: true,
+  singleQuote: true,
+  tabWidth: 2,
+  trailingComma: 'es5',
+  useTabs: false,
+};