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Add support for an optional faster file hashing method in Gatsby core #38891

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Add support for an optional faster file hashing method in Gatsby core #38891

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fbcaee9
Add support for a faster file hashing method
FraserThompson Mar 7, 2024
8150ddf
Add to flags.ts
FraserThompson Mar 7, 2024
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9 changes: 9 additions & 0 deletions packages/gatsby/src/utils/flags.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -152,6 +152,15 @@ const activeFlags: Array<IFlag> = [
? `Partial hydration is only available in Gatsby V5. Please upgrade Gatsby.`
: `Partial hydration requires React 18+ to work.`,
},
{
name: `FAST_HASHING`,
env: `GATSBY_FAST_HASHING`,
command: `all`,
telemetryId: `FastHashing`,
description: `Hashes file using a faster non-cryptographic method to improve build performance, particularly on sites sourcing large files.`,
experimental: false,
testFitness: (): fitnessEnum => true,
},
]

export default activeFlags
7 changes: 6 additions & 1 deletion packages/gatsby/src/utils/jobs/manager.ts
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Expand Up @@ -53,7 +53,12 @@ function convertPathsToAbsolute(filePath: string): string {
* Get contenthash of a file
*/
function createFileHash(path: string): string {
return hasha.fromFileSync(path, { algorithm: `sha1` })
if (process.env.GATSBY_FAST_HASHING) {
const stats = fs.statSync(path)
return stats.mtimeMs.toString() + stats.ino.toString()
} else {
return hasha.fromFileSync(path, { algorithm: `sha1` })
}
}

let hasActiveJobs: pDefer.DeferredPromise<void> | null = null
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