Fix 'npm run lint' (#46)

# Description
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    A brief description of what the PR does/changes.
    Use active voice and present tense, e.g., This commit fixes ...
-->
This PR aims to fix the 'npm run lint' command, which runs `eslint .` in
the background. I've added eslint configuration and fixed all warnings
that persisted.

# DevRev issue
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A DevRev issue link (https://app.devrev.ai/devrev/works/ISS-00000) or
`no-work-item`.
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one.
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[#ISS-185661](https://app.devrev.ai/devrev/works/ISS-185661)

# Documentation PR
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    A link to the PR in fern-api-docs if relevant, otherwise `no-docs`.
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https://github.com/devrev/fern-api-docs.
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    require an update to the documentation.
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no-docs

Author: gasperzgonec

.env.example

@@ -0,0 +1,5 @@
+# Same as the URL path for your org, e.g. app.devrev.ai/my-org
+DEV_ORG=my-org
+
+# Your email address
+USER_EMAIL=[email protected]

code/babel.config.js

@@ -1,3 +1,4 @@
+// eslint-disable-next-line no-undef
 module.exports = {
   presets: [
     ['@babel/preset-env', { targets: { node: 'current' } }],

code/eslint.config.mts

@@ -0,0 +1,12 @@
+import js from "@eslint/js";
+import globals from "globals";
+import tseslint from "typescript-eslint";
+import { defineConfig } from "eslint/config";
+import prettierConfig from "eslint-config-prettier";
+
+export default defineConfig([
+  { ignores: ["dist/**", "test/**"] },
+  { files: ["**/*.{js,mjs,cjs,ts,mts,cts}"], plugins: { js }, extends: ["js/recommended"], languageOptions: { globals: globals.browser } },
+  ...tseslint.configs.recommended,
+  prettierConfig,
+]);

code/jest.config.js

@@ -1,3 +1,4 @@
+// eslint-disable-next-line no-undef
 module.exports = {
   preset: 'ts-jest',
   testEnvironment: 'node',