How to use the sitemap.createSitemapIndex function in sitemap
To help you get started, we’ve selected a few sitemap examples, based on popular ways it is used in public projects.
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gatsbyjs / gatsby / packages / gatsby-plugin-sitemap / src / gatsby-node.js View on Github 
// sitemap-index.xml is default file name. (https://git.io/fhNgG)
const indexFilePath = path.join(
publicPath,
`${rest.sitemapName || `sitemap`}-index.xml`
)
const sitemapIndexOptions = {
...rest,
hostname: hostname || withoutTrailingSlash(siteUrl),
targetFolder: publicPath,
urls,
callback: error => {
if (error) throw new Error(error)
renameFile(indexFilePath, saved).then(resolve)
},
}
sitemap.createSitemapIndex(sitemapIndexOptions)
})
}
