1.4.0

Added

• The PEP 517 metadata_directory is now respected as an input to the build_wheel hook (#487).

Changed

• Sources are now considered more carefully when dealing with dependencies with environment markers (#497).
• EmptyConstraint is now hashable (#513).
• ParseConstraintError is now raised on version and constraint parsing errors, and includes information on the package that caused the error (#514).

Fixed

• Fix an issue where invalid PEP 508 requirements were generated due to a missing space before semicolons (#510).
• Fix an issue where relative paths were encoded into package requirements, instead of a file:// URL as required by PEP 508 (#512).

Vendoring

• jsonschema==4.17.0
• lark==1.1.14
• pyrsistent==0.19.2
• tomlkit==0.11.6
• typing-extensions==4.4.0