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import type { NextFontManifest } from '../../build/webpack/plugins/next-font-manifest-plugin'
import type { DeepReadonly } from '../../shared/lib/deep-readonly'
/**
* Get hrefs for fonts to preload
* Returns null if there are no fonts at all.
* Returns string[] if there are fonts to preload (font paths)
* Returns empty string[] if there are fonts but none to preload and no other fonts have been preloaded
* Returns null if there are fonts but none to preload and at least some were previously preloaded
*/
export function getPreloadableFonts(
nextFontManifest: DeepReadonly<NextFontManifest> | undefined,
filePath: string | undefined,
injectedFontPreloadTags: Set<string>
): string[] | null {
if (!nextFontManifest || !filePath) {
return null
}
const filepathWithoutExtension = filePath.replace(/\.[^.]+$/, '')
const fontFiles = new Set<string>()
let foundFontUsage = false
const preloadedFontFiles = nextFontManifest.app[filepathWithoutExtension]
if (preloadedFontFiles) {
foundFontUsage = true
for (const fontFile of preloadedFontFiles) {
if (!injectedFontPreloadTags.has(fontFile)) {
fontFiles.add(fontFile)
injectedFontPreloadTags.add(fontFile)
}
}
}
if (fontFiles.size) {
return [...fontFiles].sort()
} else if (foundFontUsage && injectedFontPreloadTags.size === 0) {
return []
} else {
return null
}
}
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