Add splitTestsCompilation solidity setting (7): Typechain updates

[alcuadrado]

Fairly straightforward update to the TypeChain plugin. The main difference is that now with splitTestsCompilation === false it needs to ignore the test contracts.

No errors are expected after this PR

[changeset-bot]

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[Copilot]

Pull request overview

This PR updates the Hardhat TypeChain integration to correctly exclude test artifacts from type generation when solidity.splitTestsCompilation === false (unified compilation mode), while adding regression tests/fixtures to validate unified-mode artifact behavior and npm dependency classification.

Changes:

• Filter TypeChain’s artifact list in unified mode using hre.solidity.getScope() so only contract-scope sources generate types.
• Add TypeChain tests + new fixture projects to ensure test artifacts (including .t.sol and test/) don’t generate types in unified mode.
• Add Hardhat core integration tests validating artifact APIs include test artifacts in unified mode and that ambiguous bare-name lookup fails.

Reviewed changes

Copilot reviewed 11 out of 13 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
packages/hardhat-typechain/src/internal/hook-handlers/solidity.ts	Filters artifact paths in unified mode to exclude test-scope sources before running TypeChain generation.
packages/hardhat-typechain/test/index.ts	Adds coverage for “no types for test artifacts in unified mode” and npm dependency behavior; adjusts an existing test to enable splitTestsCompilation for scope: "tests".
packages/hardhat-typechain/test/fixture-projects/unified-mode/**	New unified-mode fixture with contracts, .t.sol, and test/ sources to validate filtering.
packages/hardhat-typechain/test/fixture-projects/unified-mode-npm/**	New fixture with a fake npm dependency under node_modules for unified-mode npm artifact classification tests.
packages/hardhat/test/internal/builtin-plugins/solidity/build-system/integration/artifacts.ts	New Hardhat integration tests for artifact APIs in unified mode (including ambiguity behavior).

[Copilot]

Pull request overview

Copilot reviewed 11 out of 13 changed files in this pull request and generated 3 comments.

[Copilot]

Pull request overview

Copilot reviewed 15 out of 19 changed files in this pull request and generated 1 comment.

[Copilot]

Pull request overview

Copilot reviewed 15 out of 19 changed files in this pull request and generated 1 comment.

[schaable]

LGTM