✨ add @datadog/js-core/sample sub-path with performDraw - #4844
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Introduces a new sample sub-path per the js-core RFC, containing performDraw, ported from browser-core's tools/utils/numberUtils.ts. Used by electron-sdk for telemetry sampling decisions. Wires up the new sub-path: package.json exports + physical sample/package.json fallback, tsconfig.base.json path mapping, and typedoc.json entry point, per packages/js-core/AGENTS.md.
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Deletes performDraw from tools/utils/numberUtils.ts (round/isPercentage/ isNumber stay, they're not migrated) and points telemetry.ts and browser-core's own public re-export in index.ts at @datadog/js-core/sample instead. Adds '@datadog/js-core/sample' to the disallow-side-effects lint rule's allowlist, alongside the other side-effect-free js-core sub-paths. Removes the now-redundant performDraw test from numberUtils.spec.ts since it has identical coverage in js-core's own sample.spec.ts. Downstream packages are unaffected: performDraw was only consumed internally by browser-core; the public re-export keeps '@datadog/browser-core' backward compatible regardless.
gogusarov
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Jul 9, 2026
bdibon
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Aug 10, 2026
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gogusarov
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Motivation
Per the
@datadog/js-coreRFC,electron-sdkneedsperformDraw(used for telemetry sampling decisions), which requires a new@datadog/js-core/samplesub-path — previously there was nosampleentry at all.Changes
@datadog/js-core/sample, exportingperformDraw, ported verbatim frombrowser-core/tools/utils/numberUtils.ts(theround/isNumber/isPercentagehelpers in that same file were left out — not in scope).packages/js-core/AGENTS.md's "adding a new sub-path" checklist:package.jsonexportsfield + physicalsample/package.jsonfallback (legacy resolvers)tsconfig.base.jsonpath mappingtypedoc.jsonentry pointapi/sample.api.mdAPI Extractor golden file (auto-generated byyarn api:check --update)Pure additive change (brand new sub-path), no existing behavior changes.
Test instructions
yarn workspace @datadog/js-core build && yarn api:checkpasses.yarn typecheckpasses.yarn test:unit --spec 'packages/js-core/src/**/*.spec.ts'passes (61/61), including a newsample.spec.tsmirroring browser-core'sperformDrawtest coverage.Checklist