chore: add eslint config for the repo itself

Author: paambaati

Diff for: .eslintignore

@@ -0,0 +1,3 @@
+dist/
+.eslintrc.js
+.eslintcache

Diff for: .eslintrc.js

@@ -0,0 +1,39 @@
+module.exports = {
+  parser: '@typescript-eslint/parser',
+  parserOptions: {
+    project: './tsconfig.json',
+  },
+  plugins: ['@typescript-eslint'],
+  extends: [
+    'eslint:recommended',
+    'plugin:@typescript-eslint/recommended',
+    'plugin:@typescript-eslint/recommended-requiring-type-checking',
+    'airbnb-base',
+    'airbnb-typescript/base',
+    'plugin:import/recommended',
+    'plugin:import/typescript',
+    'prettier',
+    'plugin:prettier/recommended'
+  ],
+  rules: {
+    'no-self-compare': 'error',
+    'no-void': ['error', { allowAsStatement: true }],
+    '@typescript-eslint/consistent-type-imports': ['error', { disallowTypeAnnotations: false }],
+    'import/order': [
+      'error',
+      {
+        groups: [
+          'builtin',
+          'external',
+          'internal',
+          'parent',
+          'sibling',
+          'index',
+          'object',
+          'type',
+        ],
+      },
+    ],
+    'import/prefer-default-export': 'off', // Actually prefer named exports always, as they're tree-shakeable.
+  },
+}