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perf(v2): improve dev build time by not overwriting file if possible #2089

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merged 3 commits into from
Dec 6, 2019
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perf(v2): improve dev build time by not overwriting file if possible #2089

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004e930
perf(v2): improve sequential build time by not overwriting file if po…
endiliey Dec 5, 2019
49cf0e8
minor improvement
endiliey Dec 6, 2019
2574e11
docs
endiliey Dec 6, 2019
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13 changes: 12 additions & 1 deletion packages/docusaurus-utils/src/index.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -27,7 +27,18 @@ export async function generate(
return;
}

const lastHash = fileHash.get(filepath);
let lastHash = fileHash.get(filepath);

// If file already exist but its not in runtime cache hash yet,
// we try to calculate the content hash and then compare
// This is to avoid unnecessary overwrite and we can reuse old file
if (!lastHash && fs.existsSync(filepath)) {
const lastContent = await fs.readFile(filepath, 'utf8');
lastHash = createHash('md5')
.update(lastContent)
.digest('hex');
}

const currentHash = createHash('md5')
.update(content)
.digest('hex');
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