perf: remove dotenv dependency and use custom parse function

[chenjiahan]

Summary

This pull request replaces the dotenv dependency with a custom implementation of its parse method to reduce unused functionality.

• before:

File (esm_index)   Size       
dist/index.js      389.1 kB

• after:

File (esm_index)   Size       
dist/index.js      377.5 kB

Removed the following lines from the output bundle:

import * as __WEBPACK_EXTERNAL_MODULE_crypto__ from "crypto";
import * as __WEBPACK_EXTERNAL_MODULE_fs__ from "fs";
import * as __WEBPACK_EXTERNAL_MODULE_os__ from "os";
import * as __WEBPACK_EXTERNAL_MODULE_path__ from "path";

Related Links

https://github.com/motdotla/dotenv/blob/v16.5.0/lib/main.js#L9-L48

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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[Copilot]

Pull Request Overview

This PR refactors the environment loading logic by replacing the dotenv dependency with a custom parse function to reduce the output bundle size.

• Removed the dotenv dependency and its associated import.
• Introduced a custom parse function to handle .env file parsing.
• Updated package.json to reflect the removal of the unused dependency.

Reviewed Changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 1 comment.

File	Description
packages/core/src/loadEnv.ts	Replaced dotenv’s parse method with a custom implementation.
packages/core/package.json	Removed the dotenv dependency to reduce bundle size.

Files not reviewed (1)

• pnpm-lock.yaml: Language not supported

Comments suppressed due to low confidence (1)

packages/core/src/loadEnv.ts:19

• Ensure that the custom parse function is thoroughly covered by tests to validate its behavior against various .env file edge cases.

function parse(src: Buffer) {