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feat: add preamble to old blog posts #1003

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feat: add preamble to old blog posts #1003

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31 changes: 31 additions & 0 deletions src/theme/BlogPostItem/Header/index.tsx
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Original file line number Diff line number Diff line change
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import React, {type ReactNode} from 'react';
import Header from '@theme-original/BlogPostItem/Header';
import type HeaderType from '@theme/BlogPostItem/Header';
import type {WrapperProps} from '@docusaurus/types';
import {useBlogPost} from '@docusaurus/plugin-content-blog/client';
import Admonition from '@theme/Admonition';

type Props = WrapperProps<typeof HeaderType>;

export default function HeaderWrapper(props: Props): ReactNode {
const { metadata: { date: postDate } } = useBlogPost();

const postAgeInYears = Math.floor((Date.now() - new Date(postDate).getTime()) / (1000 * 60 * 60 * 24 * 365));

const postIsOld = postAgeInYears >= 1;

return (
<>
{
postIsOld ? (
<Admonition type="warning">
<p>
This blog post is over { postAgeInYears } { postAgeInYears === 1 ? 'year' : 'years' } old.
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@nmggithub nmggithub Feb 2, 2026

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This word copy can be adjusted as needed.

</p>
</Admonition>
) : null
}
<Header {...props} />
</>
);
}
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