Hardhat 3 Build System Integration testing and cleanup

[kanej]

The Hardhat 3 build system is in place, but there is a gap in test coverage and features before we consider it ready for production. This ticket captures those tasks.

TODO

Hardhat

• Validate the rest of the config paths
• Test the config paths resolution
• Running the tests deletes your compilers

hardhat-mocha and hardhat-node-test runner

• Test the config paths resolution in hardhat-mocha
• Test the config paths resolution in hardhat-node-test-runner

Config

• Complete the resolution and validtion of the Solidity config
• Improve the build profiles resolution by implementing a merge algorithm

Compilation Job

• Deep merge the output selection — Note: this is not done during config resolution in v3, as it depends on the actual compilation job
• Test the compilation job

Artifacts

• v2 feature to suggest similar names when name cannot be found
• Linking may require a fuzzy matcher of source names
  e.g. instead of npm/[email protected]/A.sol:A, we may want to accept A.sol:A if it isn’t ambiguous

Polishing

• Print a helpful error message if someone tries to compile with solc <0.4.11, as it’s not supported

hardhat utils

• Test getAllDirectoriesMatching