2018-12-02 18:30:00 +01:00
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export async function generateBuildId (generate: () => string|null, fallback: () => string): Promise<string> {
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let buildId = await generate()
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// If there's no buildId defined we'll fall back
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if (buildId === null) {
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2019-04-01 21:22:21 +02:00
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// We also create a new buildId if it starts with `ad` to avoid false
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// positives with ad blockers
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2019-04-02 02:40:43 +02:00
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while (!buildId || /ad/i.test(buildId)) {
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2019-04-01 21:22:21 +02:00
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buildId = fallback()
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}
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2018-12-02 18:30:00 +01:00
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}
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if (typeof buildId !== 'string') {
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throw new Error('generateBuildId did not return a string. https://err.sh/zeit/next.js/generatebuildid-not-a-string')
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}
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return buildId.trim()
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}
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