feat: add backwards compatibility for `Response::traces` by Wodann · Pull Request #1301 · NomicFoundation/edr

Wodann · 2026-02-19T17:54:52Z

Resolves #1288.

This reintroduces the Response::traces getter function to maintain support for Hardhat 2's EthereumJS VM interface.

I tested this using the help of Claude:

Hardhat Plugin Compatibility Report — EDR Tracing Back-Compat

Date: 2026-02-20
EDR branch: feat/tracing-back-compat
Hardhat branch: hh2/tracing-unification

Overview

This report validates that the new EDR trace format (unified tracing architecture)
is backward-compatible with the existing Hardhat v2 plugin ecosystem. Testing was
performed at three levels:

Plugin test suites — each plugin's own tests run against local Hardhat+EDR
Third-party project tests — real-world projects using stock plugins
Third-party projects with linked plugins — full local stack (EDR + Hardhat + plugins)

Critical Finding: `includeCallTraces` Default

During testing, solidity-coverage's test suite revealed that Response::traces()
returned empty arrays because include_call_traces defaults to IncludeTraces::None
in the new architecture. This was fixed in Hardhat commit c46cf5b by setting
includeCallTraces: IncludeTraces.All in the provider's observability config.

Plugin Test Suite Results

hardhat-gas-reporter v2.3.0

Category	Pass	Fail	Notes
Unit tests	16	5	Failures: missing API keys (CMC/Etherscan)
Integration tests	30	7	Failures: missing API keys + Alchemy token

Trace-format failures: 0. All gas measurement and reporting functionality works.

solidity-coverage v0.8.17

Category	Pass	Fail	Notes
Unit tests (before fix)	60	75	All failures: 0% coverage
Unit tests (after fix)	135	0	All recovered
Integration tests (before fix)	19	23	All failures: 0% coverage
Integration tests (after fix)	41	1	1 pre-existing (block gas limit)

Trace-format failures after fix: 0.

hardhat-tracer v3.4.0

Category	Pass	Fail	Notes
Tests	9	4	Failures: 2 missing Alchemy key, 2 stdin bug

Trace-format failures: 0. All trace-exercising tests pass (CALLs, STATICCALLs,
DELEGATECALLs, opcodes, debug_traceTransaction).

Third-Party Project Results (with linked plugins)

Seaport (best result — full validation)

Mode	Pass	Extra
Tests	402	--
Gas Reporter	402	Real gas data (e.g., ConduitController.createConduit avg 223,418)
Coverage	402	13.79% stmts overall; 95% for zones

OpenZeppelin Contracts v5.5.0

Mode	Pass	Fail	Extra
Tests (ERC20)	126	0	--
Gas Reporter	126	0	Real gas data (approve avg 44,656; transfer avg 40,133)
Coverage	--	--	Compilation fails (instrumentation bloat, not trace-related)

NexusMutual

Mode	Pass	Fail	Extra
Tests	0	2	Gas cap issue (30M > 16.7M cap)
Gas Reporter	0	2	Same gas cap issue
Coverage	2	0	Non-zero data (Pool.sol: 29.77% stmts)

Additional projects tested (stock plugins, local Hardhat+EDR)

Project	Tests	Gas Reporter	Coverage	Trace Errors
Rocket Pool	Subset pass	Works	Works	None
Synthetix	99/99 pass	Works	N/A	None
Safe Contracts	0/58 (gas cap)	N/A	N/A	None

Non-Trace Issues Found

EIP-7825 gas cap (Safe, NexusMutual): Transactions exceeding 16,777,216 gas
fail. This is a hardfork behavioral change, not a trace issue.
Synthetix function overloading: Pre-existing EDR limitation. Unrelated to traces.
OpenZeppelin coverage compilation: solidity-coverage instrumentation bloat
causes compilation failure on the full OZ codebase. Not trace-related.

Risk Assessment

Risk of trace format changes breaking existing Hardhat plugins: LOW

With the includeCallTraces: IncludeTraces.All fix in place, the backward-compatibility
layer in EDR (Response::traces()) combined with the Hardhat adapter successfully
preserves the expected trace format for all tested plugins:

hardhat-gas-reporter: Fully functional
solidity-coverage: Fully functional (after fix)
hardhat-tracer: Fully functional

changeset-bot · 2026-02-19T17:54:59Z

🦋 Changeset detected

Latest commit: 41931b5

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@nomicfoundation/edr	Minor

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

Copilot

Pull request overview

This PR reintroduces backwards compatibility for the Response::traces getter to support Hardhat 2's EthereumJS VM interface. The implementation converts the new CallTraceArena format back to the flat trace format that Hardhat 2 expects.

Changes:

Adds Response::traces() method that converts CallTraceArena to flat trace format compatible with Hardhat 2
Removes edr_tracing dependency from multiple crates
Deletes nested_tracer.rs and related code that are no longer needed
Re-enables verbose tracing tests for Hardhat 2 compatibility

Reviewed changes

Copilot reviewed 22 out of 25 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
`crates/edr_napi/src/trace.rs`	Implements conversion from `CallTraceArena` to flat trace format with Hardhat 2 compatibility quirks
`crates/edr_napi/src/provider/response.rs`	Adds `traces()` method to Response
`crates/edr_provider/src/observability.rs`	Updates tracing configuration to capture full stack snapshots
`patches/hardhat@2.28.4.patch`	Updates Hardhat 2 integration to use new trace format
`crates/edr_napi/test/provider.ts`	Re-enables verbose tracing tests
Multiple Cargo.toml files	Removes `edr_tracing` dependency
`crates/edr_solidity/src/nested_tracer.rs`	Deleted - no longer needed

Files not reviewed (1)

pnpm-lock.yaml: Language not supported

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

Copilot · 2026-02-19T17:57:39Z

        let tracing_config = if config.verbose_raw_tracing {
            TracingInspectorConfig::all()
        } else {
-            TracingInspectorConfig::default_parity().set_steps(true)
+            TracingInspectorConfig::default_parity()
+                .set_steps(true)
+                .set_stack_snapshots(StackSnapshotType::Full)


The StackSnapshotType::Full configuration is set regardless of verbose mode. This means that the full stack will always be captured in the tracing inspector, even when verbose tracing is disabled.

However, the actual filtering to return only the top of the stack happens in the conversion function raw_trace_from_call_trace_arena based on the verbose parameter. This creates an inconsistency where:

The inspector always captures full stack (performance cost)

The conversion then throws away most of the data when verbose=false

Consider setting StackSnapshotType based on verbose_raw_tracing to avoid unnecessary data collection and improve performance.

It's fixed in the stacked PRs rather than here: #1536 drops StackSnapshotType::Full from the non-verbose config and captures only the top of the stack per step.

codecov · 2026-02-19T18:32:28Z

Codecov Report

❌ Patch coverage is 87.83784% with 18 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.10%. Comparing base (46b2d01) to head (a8ef4d2).

Files with missing lines	Patch %	Lines
crates/edr_napi/src/trace.rs	86.55%	14 Missing and 2 partials ⚠️
crates/edr_napi_core/src/spec.rs	71.42%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1301      +/-   ##
==========================================
+ Coverage   79.67%   80.10%   +0.42%     
==========================================
  Files         446      445       -1     
  Lines       76647    76436     -211     
  Branches    76647    76436     -211     
==========================================
+ Hits        61072    61228     +156     
+ Misses      13457    13086     -371     
- Partials     2118     2122       +4

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

popescuoctavian

Overall looks good, but I believe there is an issue which Copilot pointed out and a small simplification.

popescuoctavian

There is significant performance regression seen in the benchmarks -- up to 2.45x.

I believe this is caused by the inclusion of the full stack snapshot. However, I don't see an immediate solution here, with the existing revm-inspectors tracing code.

The verbose-mode trace tests send raw eth_sendTransaction requests without a gas field, so they inherited defaultTransactionGasLimit. Under the latest L1 hardfork the EIP-7825 per-transaction gas cap rejects that, producing no trace arena and an empty traces() result. Set an explicit sub-cap gas limit, matching the existing isStaticCall test.

Regenerate the hardhat patch against 2.28.6: all code hunks apply unchanged; hardhat#7918 only shifted the provider source maps, which are spliced from the old patch and drift by a few mapping lines after the changed region (cosmetic, dev-only). Set observability.includeCallTraces: All at provider creation. Without it Response.traces() returns no arenas and the re-enabled vm trace-event bridge silently emits nothing (the solidity-coverage 0%-coverage failure mode). Add a hardhat-tests spec asserting step/beforeMessage/afterMessage fire on a transaction: the only executable coverage of the bridge.

socket-security · 2026-07-06T11:13:19Z

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	npm/hardhat@2.28.6

View full report

)

Wodann requested a review from Copilot February 19, 2026 17:54

Wodann self-assigned this Feb 19, 2026

Wodann had a problem deploying to github-action-benchmark February 19, 2026 17:54 — with GitHub Actions Error

Copilot started reviewing on behalf of Wodann February 19, 2026 17:55 View session

Copilot AI reviewed Feb 19, 2026

View reviewed changes

Wodann force-pushed the feat/tracing-back-compat branch from 87edb00 to 041399f Compare February 19, 2026 18:01

Wodann temporarily deployed to github-action-benchmark February 19, 2026 18:01 — with GitHub Actions Inactive

Wodann had a problem deploying to github-action-benchmark February 19, 2026 18:08 — with GitHub Actions Error

Wodann temporarily deployed to github-action-benchmark February 19, 2026 18:08 — with GitHub Actions Inactive

Wodann had a problem deploying to github-action-benchmark February 19, 2026 18:16 — with GitHub Actions Failure

Wodann requested a review from a team February 20, 2026 19:49

Wodann marked this pull request as ready for review February 20, 2026 22:32

popescuoctavian reviewed Feb 23, 2026

View reviewed changes

Comment thread crates/edr_napi/src/trace.rs Outdated

Comment thread crates/edr_napi/src/trace.rs Outdated

popescuoctavian temporarily deployed to github-action-benchmark February 23, 2026 14:59 — with GitHub Actions Inactive

popescuoctavian temporarily deployed to github-action-benchmark February 23, 2026 15:07 — with GitHub Actions Inactive

popescuoctavian had a problem deploying to github-action-benchmark February 23, 2026 15:07 — with GitHub Actions Failure

popescuoctavian reviewed Feb 23, 2026

View reviewed changes

popescuoctavian temporarily deployed to github-action-benchmark February 23, 2026 19:23 — with GitHub Actions Inactive

popescuoctavian temporarily deployed to github-action-benchmark February 23, 2026 19:40 — with GitHub Actions Inactive

popescuoctavian temporarily deployed to github-action-benchmark February 23, 2026 20:53 — with GitHub Actions Inactive

popescuoctavian had a problem deploying to github-action-benchmark February 23, 2026 21:29 — with GitHub Actions Failure

popescuoctavian temporarily deployed to github-action-benchmark February 23, 2026 21:29 — with GitHub Actions Inactive

popescuoctavian force-pushed the feat/tracing-back-compat branch from d203b12 to 369dc66 Compare February 23, 2026 23:17

popescuoctavian temporarily deployed to github-action-benchmark February 23, 2026 23:17 — with GitHub Actions Inactive

popescuoctavian temporarily deployed to github-action-benchmark February 23, 2026 23:19 — with GitHub Actions Inactive

popescuoctavian had a problem deploying to github-action-benchmark February 23, 2026 23:19 — with GitHub Actions Failure

Wodann mentioned this pull request Mar 3, 2026

build: upgrade to Rust v1.91.0 #1318

Merged

nebasuke force-pushed the feat/tracing-back-compat branch from 369dc66 to f017c6b Compare July 3, 2026 16:15

nebasuke temporarily deployed to github-action-benchmark July 3, 2026 16:15 — with GitHub Actions Inactive

nebasuke had a problem deploying to github-action-benchmark July 3, 2026 16:17 — with GitHub Actions Failure

nebasuke temporarily deployed to github-action-benchmark July 3, 2026 16:17 — with GitHub Actions Inactive

This was referenced Jul 3, 2026

perf: capture only the top of the stack for non-verbose raw traces #1536

Open

HH2: Port hardhat-network provider to the current EDR API and restore trace events NomicFoundation/hardhat#8422

Draft

perf: make raw trace collection demand-driven #1541

Draft

Wodann and others added 5 commits July 6, 2026 10:34

feat: add backwards compatibility for Response::traces

6b35186

misc: add changeset

081edd9

address feedback

8c8c3dc

nebasuke force-pushed the feat/tracing-back-compat branch from 9acaaac to a8ef4d2 Compare July 6, 2026 11:12

nebasuke temporarily deployed to github-action-benchmark July 6, 2026 11:12 — with GitHub Actions Inactive

nebasuke had a problem deploying to github-action-benchmark July 6, 2026 12:14 — with GitHub Actions Failure

nebasuke mentioned this pull request Jul 6, 2026

perf: record only the top of the stack for non-verbose raw traces #1544

Merged

nebasuke had a problem deploying to github-action-benchmark July 6, 2026 20:56 — with GitHub Actions Failure

perf: record only the top of the stack for non-verbose raw traces (#1544

41931b5

)

Provide feedback

Saved searches

Use saved searches to filter your results more quickly

Uh oh!

feat: add backwards compatibility for `Response::traces`#1301

feat: add backwards compatibility for `Response::traces`#1301
Wodann wants to merge 6 commits into
mainfrom
feat/tracing-back-compat

Wodann commented Feb 19, 2026 •

edited

Loading

Uh oh!

changeset-bot Bot commented Feb 19, 2026 •

edited

Loading

Uh oh!

Copilot AI left a comment

Uh oh!

Uh oh!

Copilot AI Feb 19, 2026

Uh oh!

nebasuke Jul 6, 2026

Uh oh!

codecov Bot commented Feb 19, 2026 •

edited

Loading

Uh oh!

popescuoctavian left a comment •

edited

Loading

Uh oh!

Uh oh!

Uh oh!

popescuoctavian left a comment

Uh oh!

socket-security Bot commented Jul 6, 2026

Uh oh!

Reviewers

Assignees

Labels

Projects

Milestone

Development

Uh oh!

4 participants

Uh oh!

Conversation

Wodann commented Feb 19, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

Uh oh!

Hardhat Plugin Compatibility Report — EDR Tracing Back-Compat

Overview

Critical Finding: includeCallTraces Default

Plugin Test Suite Results

hardhat-gas-reporter v2.3.0

solidity-coverage v0.8.17

hardhat-tracer v3.4.0

Third-Party Project Results (with linked plugins)

Seaport (best result — full validation)

OpenZeppelin Contracts v5.5.0

NexusMutual

Additional projects tested (stock plugins, local Hardhat+EDR)

Non-Trace Issues Found

Risk Assessment

Uh oh!

changeset-bot Bot commented Feb 19, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

Uh oh!

🦋 Changeset detected

Uh oh!

Copilot AI left a comment

Choose a reason for hiding this comment

Pull request overview

Reviewed changes

Uh oh!

Uh oh!

Copilot AI Feb 19, 2026

Choose a reason for hiding this comment

Uh oh!

nebasuke Jul 6, 2026

Choose a reason for hiding this comment

Uh oh!

codecov Bot commented Feb 19, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

Uh oh!

Codecov Report

Uh oh!

popescuoctavian left a comment • edited Loading Uh oh! There was an error while loading. Please reload this page.

Uh oh!

Choose a reason for hiding this comment

Uh oh!

Uh oh!

Uh oh!

popescuoctavian left a comment

Choose a reason for hiding this comment

Uh oh!

socket-security Bot commented Jul 6, 2026

Uh oh!

Reviewers

Assignees

Labels

Projects

Milestone

Development

Uh oh!

4 participants

Wodann commented Feb 19, 2026 •

edited

Loading

Critical Finding: `includeCallTraces` Default

changeset-bot Bot commented Feb 19, 2026 •

edited

Loading

codecov Bot commented Feb 19, 2026 •

edited

Loading

popescuoctavian left a comment •

edited

Loading