Fix CopyPromptButton crashing when rendered with no props

[dprevoznik]

Summary

• The homepage's fast setup copy-prompt button disappeared after Add Foreman integration guide to Vercel section #510 refactored CopyPromptButton to accept optional prompt/label props for reuse on the new Foreman page.
• <CopyPromptButton /> with no attributes renders with null props under the classic JSX transform. Destructured parameter defaults ({ prompt = X } = {}) only apply when the argument is undefined, not null, so the no-props call throws and the component renders empty.
• foreman.mdx always passes an explicit prompt object, so that usage was unaffected — only the homepage broke.

Fix: destructure prompt/label from props || {} inside the function body instead of relying on a parameter-level default, so both null and undefined fall back correctly.

Test plan

• Reproduced the exact failure in a Node harness: the old signature throws on Component(null); the new one returns the correct defaults for null, undefined, and a real props object.
• Confirmed via a live browser session against kernel.sh/docs that the homepage button currently renders as an empty <div> with no console errors, consistent with a swallowed render-time exception rather than a network/asset failure.
• Could not run mintlify dev in this sandbox to visually confirm the button reappears (matches the constraint noted in Add Foreman integration guide to Vercel section #510).

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Note

Low Risk
Tiny UI-only defaulting change in a docs snippet; no auth, data, or API impact.

Overview
Fixes the homepage copy-prompt button disappearing when rendered as <CopyPromptButton /> with no attributes.

Classic JSX can pass null props, so parameter defaults ({ prompt = … } = {}) never ran and destructuring threw. Defaults are now taken from props || {} so null and undefined both fall back to DEFAULT_PROMPT and the default label.

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[cursor]

Risk assessment: Very Low

Verdict: Approve.

What changed

A two-line fix in snippets/copy-prompt-button.jsx. The component now reads prompt/label from props || {} instead of destructuring in the parameter list with = {}. Callers that pass a real props object are unchanged. Callers that pass null (classic JSX with no attributes) no longer throw on destructure and fall back to the existing defaults.

DEFAULT_PROMPT text is not modified. The only other usages are <CopyPromptButton /> on the docs homepage and an explicit prompt={...} on the Foreman page.

Why this is Very Low

• Scope: 1 file, +2/−1. Docs-site snippet only.
• Blast radius: Restores the intended no-props render path. Explicit-prop usage is unaffected.
• Infra / security: No auth, permissions, APIs, schema, or infrastructure.
• Prompts: The LLM prompt string in this file is unchanged; this is a JS defaulting fix, not a prompt edit.
• Correctness: null and undefined both get the same defaults. Easy to reason about.

No CODEOWNERS file, and this PR has no prior reviews or approvals.

  

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Project	Status	Preview	Updated (UTC)
Kernel	🔴 Failed	–	Aug 21, 2026, 6:19 PM

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