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build: derive generated-file stamps from git commit time, not wall clock
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Two builds of the same source tree could publish different artifacts
because buildEmbeddedPatterns.ts and buildTypeEmbeddings.ts stamped
their generated output with new Date().toISOString(). Route both
generators' "Generated:" header and the generatedAt runtime field
through a shared resolver: newest git commit time among the
generator's inputs (script + source data), falling back to the stamp
already present in the previous output when git is unavailable (e.g.
a published tarball build), and finally to a fixed epoch value. Every
fallback logs to stderr so degradation is never silent.

Regenerated both committed output files once so the tree carries
deterministic stamps; no other content changed.
This commit is contained in:
David Snelling 2026-08-27 09:18:45 -07:00
parent aad9e2eeb1
commit 8a5c1245a7
5 changed files with 148 additions and 9 deletions
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18
scripts/buildTypeEmbeddings.ts
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@ -11,6 +11,7 @@ import * as fs from 'fs/promises'
import * as path from 'path'
import { fileURLToPath } from 'url'
import { NounType, VerbType } from '../src/types/graphTypes.js'
import { resolveDeterministicStamp } from './lib/deterministicStamp.js'
const __dirname = path.dirname(fileURLToPath(import.meta.url))
@ -373,12 +374,24 @@ async function buildTypeEmbeddings() {
const uint8 = new Uint8Array(buffer)
const base64 = Buffer.from(uint8).toString('base64')
// Deterministic stamp: derived from the git commit time of this
// generator's inputs, never from wall-clock time — two builds of the
// same source tree must produce byte-identical output.
const outputPath = path.join(__dirname, '..', 'src', 'neural', 'embeddedTypeEmbeddings.ts')
const generatedStamp = resolveDeterministicStamp(
[
path.join(__dirname, 'buildTypeEmbeddings.ts'),
path.join(__dirname, '..', 'src', 'types', 'graphTypes.ts')
],
outputPath
)
// Generate TypeScript file
const tsContent = `/**
* 🧠 BRAINY EMBEDDED TYPE EMBEDDINGS
*
* AUTO-GENERATED - DO NOT EDIT
* Generated: ${new Date().toISOString()}
* Generated: ${generatedStamp}
* Noun Types: ${nounTypes.length}
* Verb Types: ${verbTypes.length}
*
@ -395,7 +408,7 @@ export const TYPE_METADATA = {
verbTypes: ${verbTypes.length},
totalTypes: ${totalTypes},
embeddingDimensions: ${embeddingDim},
generatedAt: "${new Date().toISOString()}",
generatedAt: "${generatedStamp}",
sizeBytes: {
embeddings: ${buffer.byteLength},
base64: ${base64.length}
@ -494,7 +507,6 @@ prodLog.info(\`🧠 Brainy Type Embeddings loaded: \${TYPE_METADATA.nounTypes} n
`
// Write the TypeScript file
const outputPath = path.join(__dirname, '..', 'src', 'neural', 'embeddedTypeEmbeddings.ts')
await fs.writeFile(outputPath, tsContent)
// Report statistics