fix(@stdlib/string/base/atob): guard global atob reference to prevent ReferenceError

[Planeshifter]

Description

What is the purpose of this pull request?

This pull request:

• Fixes lib/node_modules/@stdlib/string/base/atob/lib/global.js, which re-exported the bare global atob identifier directly. On Node.js runtimes that predate the global atob/btoa (added in Node 16+), referencing an undeclared identifier without a typeof guard throws ReferenceError: atob is not defined at module-evaluation time. Because main.js requires global.js at its top level, outside any try/catch, merely requiring the package crashed on Node 12/14. This broke the linux_test CI workflow's Node.js v12 and v14 jobs on every scheduled run against develop. The fix guards the reference with typeof atob === 'function', matching the identical pattern already used by the sibling @stdlib/assert/has-atob-support package.

Related Issues

Does this pull request have any related issues?

None.

Questions

Any questions for reviewers of this pull request?

No.

Other

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Found and fixed as part of automated CI-failure triage. Failing run: https://github.com/stdlib-js/stdlib/actions/runs/28785480753 (job: linux_test, Node.js v14; also reproduced on Node.js v12 and the macOS Node.js v16 job of the same run).

Validated by reproducing the crash and fix locally via a Node script that deletes globalThis.atob and confirms require() no longer throws. Reviewed by three independent passes (correctness, regression scope, style/conventions); all approved with no blocking findings.

Checklist

Please ensure the following tasks are completed before submitting this pull request.

• Read, understood, and followed the contributing guidelines.

AI Assistance

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Disclosure

If you answered "yes" to using AI assistance, please provide a short disclosure indicating how you used AI assistance. This helps reviewers determine how much scrutiny to apply when reviewing your contribution. Example disclosures: "This PR was written primarily by Claude Code." or "I consulted ChatGPT to understand the codebase, but the proposed changes were fully authored manually by myself.".

This PR was written primarily by Claude Code as part of an automated CI-failure triage and fix routine, based on live GitHub Actions job log analysis. The fix was reviewed by three independent automated review passes before being proposed here.

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[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
string/base/atob	$\\color{green}217/217$ $\\color{green}+100.00\\%$	$\\color{red}11/12$ $\\color{green}+91.67\\%$	$\\color{green}2/2$ $\\color{green}+100.00\\%$	$\\color{green}217/217$ $\\color{green}+100.00\\%$

The above coverage report was generated for the changes in this PR.