test(bun): expand runtime smoke coverage by BridgeAR · Pull Request #10048 · DataDog/dd-trace-js

BridgeAR · 2026-08-28T13:57:53Z

This updates Bun to 1.4.0 and expands the runtime smoke suite to verify trace export, startup telemetry, async context propagation, HTTP client/server parenting, and Express route instrumentation.

Bun remains pinned as an exact development dependency so Dependabot updates the runtime and lockfile together. CI reads that pin for its bootstrap and runs the existing test:core and test:shimmer scripts through the installed local binary.

Proxyquire-dependent suites remain excluded because Bun treats module._load as a no-op. Proxyquire therefore cannot intercept CommonJS child loads through its Node-specific loader hook.

Bun 1.4.0 provides enough Node.js compatibility to pin async scope propagation, HTTP parentage, and Express auto-instrumentation in the runtime job.

…-bun-1-4-smoke-tests

Each unit spec runs in a separate Bun process because shared tracer and timer state makes a combined Mocha process order-dependent.

…-bun-1-4-smoke-tests

Bun's --bun mode replaces node recursively, so the Bun job can use the same package-script definitions as Node.

npm exec installs a missing package automatically in CI, while the global bootstrap restated the Bun version. Read the bootstrap version from package.json and invoke the installed local binary so Dependabot owns one pin.

dd-octo-sts · 2026-08-28T13:58:45Z

Overall package size

Self size: 8.56 MB
Deduped: 9.23 MB
No deduping: 9.23 MB

Dependency sizes

| name | version | self size | total size | |------|---------|-----------|------------| | import-in-the-middle | 3.4.0 | 127.33 kB | 447.04 kB | | opentracing | 0.14.7 | 194.81 kB | 194.81 kB | | dc-polyfill | 0.1.11 | 25.74 kB | 25.74 kB |

_{🤖 This report was automatically generated by heaviest-objects-in-the-universe}

datadog-prod-us1-6 · 2026-08-28T14:02:03Z

🎉 All green!

🧪 All tests passed
❄️ No new flaky tests detected

🎯 Code Coverage (details)
• Patch Coverage: 100.00%
• Overall Coverage: 98.60% (+0.00%)

_{This comment will be updated automatically if new data arrives.

🔗 Commit SHA: 744cbf4 | Docs | View more details | Give us feedback!}

pr-commenter · 2026-08-28T14:11:38Z

Benchmarks

Benchmark execution time: 2026-08-31 12:31:11

Comparing candidate commit 744cbf4 in PR branch BridgeAR/2026-08-28-bun-1-4-smoke-tests with baseline commit 6a922b4 in branch master.

📊 Benchmarking dashboard

Found 1 performance improvements and 0 performance regressions! Performance is the same for 2293 metrics, 16 unstable metrics.

Explanation

This is an A/B test comparing a candidate commit's performance against that of a baseline commit. Performance changes are noted in the tables below as:

🟩 = significantly better candidate vs. baseline
🟥 = significantly worse candidate vs. baseline

We compute a confidence interval (CI) over the relative difference of means between metrics from the candidate and baseline commits, considering the baseline as the reference.

If the CI is entirely outside the configured SIGNIFICANT_IMPACT_THRESHOLD (or the deprecated UNCONFIDENCE_THRESHOLD), the change is considered significant.

Feel free to reach out to #apm-benchmarking-platform on Slack if you have any questions.

More details about the CI and significant changes

You can imagine this CI as a range of values that is likely to contain the true difference of means between the candidate and baseline commits.

CIs of the difference of means are often centered around 0%, because often changes are not that big:

---------------------------------(------|---^--------)-------------------------------->
                              -0.6%    0%  0.3%     +1.2%
                                 |          |        |
         lower bound of the CI --'          |        |
sample mean (center of the CI) -------------'        |
         upper bound of the CI ----------------------'

As described above, a change is considered significant if the CI is entirely outside the configured SIGNIFICANT_IMPACT_THRESHOLD (or the deprecated UNCONFIDENCE_THRESHOLD).

For instance, for an execution time metric, this confidence interval indicates a significantly worse performance:

----------------------------------------|---------|---(---------^---------)---------->
                                       0%        1%  1.3%      2.2%      3.1%
                                                  |   |         |         |
       significant impact threshold --------------'   |         |         |
                      lower bound of CI --------------'         |         |
       sample mean (center of the CI) --------------------------'         |
                      upper bound of CI ----------------------------------'

scenario:encoders-0.4-events-native-20

🟩 max_rss_usage [-10.686MB; -3.165MB] or [-7.513%; -2.225%]

Unstable benchmarks

These benchmarks have a confidence interval too wide to call a change; treat them as noise rather than signal.

scenario:appsec-appsec-enabled-20

unstable max_rss_usage [-31.077MB; +43.782MB] or [-16.579%; +23.356%]

scenario:appsec-iast-no-vulnerability-iast-enabled-default-config-20

unstable max_rss_usage [-17.731MB; +5.558MB] or [-7.653%; +2.399%]

scenario:debugger-line-probe-with-snapshot-minimal-24

unstable max_rss_usage [-9.325MB; +18.573MB] or [-3.751%; +7.470%]

scenario:dogstatsd-with-tags-20

unstable cpu_user_time [-135.699ms; +578.119ms] or [-2.822%; +12.023%]
unstable execution_time [-140.478ms; +585.635ms] or [-2.872%; +11.975%]
unstable throughput [-200256.468op/s; +50187.293op/s] or [-11.654%; +2.921%]

scenario:plugin-claude-agent-sdk-compact-stream-scan-26

unstable cpu_usage_percentage [-4.166%; +5.962%]

scenario:plugin-graphql-long-with-depth-off-20

unstable max_rss_usage [-7497.612KB; +7534.183KB] or [-5.984%; +6.013%]

scenario:plugin-graphql-long-with-depth-on-max-20

unstable cpu_user_time [-723.508ms; +486.411ms] or [-6.304%; +4.238%]
unstable execution_time [-741.211ms; +500.307ms] or [-6.333%; +4.274%]
unstable throughput [-3.032op/s; +4.146op/s] or [-4.403%; +6.021%]

scenario:plugin-pg-service-26

unstable cpu_user_time [-49.453ms; +61.822ms] or [-5.546%; +6.933%]
unstable execution_time [-49.334ms; +63.065ms] or [-5.504%; +7.036%]
unstable throughput [-408081.366op/s; +331786.327op/s] or [-6.018%; +4.893%]

scenario:plugin-pino-json-log-injection-24

unstable execution_time [-135.758ms; +188.034ms] or [-4.718%; +6.534%]

scenario:test-optimization-large-suite-20

unstable max_rss_usage [-4398.728KB; +6110.728KB] or [-5.501%; +7.642%]

codecov · 2026-08-28T14:25:04Z

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.60%. Comparing base (6a922b4) to head (744cbf4).

Additional details and impacted files

@@           Coverage Diff            @@
##           master   #10048    +/-   ##
========================================
  Coverage   98.60%   98.60%            
========================================
  Files         992      992            
  Lines      149800   149800            
  Branches    12758    13096   +338     
========================================
  Hits       147704   147704            
  Misses       2096     2096

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BridgeAR added 6 commits August 28, 2026 13:07

test(bun): expand runtime smoke coverage

5012ab2

Bun 1.4.0 provides enough Node.js compatibility to pin async scope propagation, HTTP parentage, and Express auto-instrumentation in the runtime job.

Merge remote-tracking branch 'origin/master' into BridgeAR/2026-08-28…

3b9a3b1

…-bun-1-4-smoke-tests

ci(bun): run existing test suites

992f7db

Each unit spec runs in a separate Bun process because shared tracer and timer state makes a combined Mocha process order-dependent.

Merge remote-tracking branch 'origin/master' into BridgeAR/2026-08-28…

7201c6d

…-bun-1-4-smoke-tests

ci(bun): reuse package test scripts

67f1e4c

Bun's --bun mode replaces node recursively, so the Bun job can use the same package-script definitions as Node.

ci(bun): enforce the pinned runtime

316e585

npm exec installs a missing package automatically in CI, while the global bootstrap restated the Bun version. Read the bootstrap version from package.json and invoke the installed local binary so Dependabot owns one pin.

github-actions Bot added the semver-patch label Aug 28, 2026

Merge branch 'master' into BridgeAR/2026-08-28-bun-1-4-smoke-tests

744cbf4

BridgeAR marked this pull request as ready for review August 31, 2026 12:20

BridgeAR requested review from a team as code owners August 31, 2026 12:20

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test(bun): expand runtime smoke coverage - #10048

test(bun): expand runtime smoke coverage#10048
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Explanation

More details about the CI and significant changes

Unstable benchmarks

scenario:appsec-appsec-enabled-20

scenario:appsec-iast-no-vulnerability-iast-enabled-default-config-20

scenario:debugger-line-probe-with-snapshot-minimal-24

scenario:dogstatsd-with-tags-20

scenario:plugin-claude-agent-sdk-compact-stream-scan-26

scenario:plugin-graphql-long-with-depth-off-20

scenario:plugin-graphql-long-with-depth-on-max-20

scenario:plugin-pg-service-26

scenario:plugin-pino-json-log-injection-24

scenario:test-optimization-large-suite-20

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Overall package size

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Benchmarks

Explanation

More details about the CI and significant changes

scenario:encoders-0.4-events-native-20

Unstable benchmarks

scenario:appsec-appsec-enabled-20

scenario:appsec-iast-no-vulnerability-iast-enabled-default-config-20

scenario:debugger-line-probe-with-snapshot-minimal-24

scenario:dogstatsd-with-tags-20

scenario:plugin-claude-agent-sdk-compact-stream-scan-26

scenario:plugin-graphql-long-with-depth-off-20

scenario:plugin-graphql-long-with-depth-on-max-20

scenario:plugin-pg-service-26

scenario:plugin-pino-json-log-injection-24

scenario:test-optimization-large-suite-20

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