purescript/purescript v0.10.3

on GitHub

Enhancements

Solving IsSymbol instances

(@LiamGoodacre)

The compiler will now derive Data.Symbol.IsSymbol instances for type-level string literals.

This enables interesting type-level programming features, such as deriving Show instances using Data.Generics.Rep.

Rows in Instance Heads

(@LiamGoodacre)

The compiler now allows rows to appear in type class instance heads, but only in type arguments which are fully determined by some functional dependency.

This allows instances like

MonadState { field :: Type } MyAppMonad

and also Newtype instances for newtypes which contain records.

Speeds up parsing by reading files as Text

(@kritzcreek)

The use of String has been replaced by Text in the compiler, resulting in some non-trivial performance improvements.

Functional Dependencies in psc-docs output

(@soupi, #2439)

psc-docs now includes functional dependency information when rendering type classes.

New psc-package Commands

• The available command (@andyarvanitis) shows all available packages in the current package set
• The uninstall command (@joneshf) removes a package from the set of active packages and updates the package configuration file.

Type Class Warning (@joneshf)

A warning was added for shadowed type variables in type class declarations.

Bug Fixes

• psc-package: display full path in 'packages.json does not exist' error messsage (@andyarvanitis)
• Use writeUTF8File in psc-bundle (@hdgarrood)
• Use HTTPS to query Pursuit (@paf31)
• Moved the expansion of astral code points to UTF-16 surrogate pairs from the JS code generator to the parser (@michaelficarra, #2434)
• Allow astral code points in record literal keys (@michaelficarra, #2438)
• Add value source positions (@nwolverson)
• Update error message of ErrorInDataBindingGroup to include participating identifiers (@LiamGoodacre)

psc-ide

• Polling option for psc-ide-server (@kritzcreek)
• Better logging and diagnostics (@kritzcreek)

Other

• Dump output of psc tests to file (@andyarvanitis, #2453)
• Fix windows CI (@hdgarrood)
• Link to new documentation repo (@hdgarrood)
• Create documentation for psc-package (@paf31)
• Fix GHC 8.0.2 build (@RyanGlScott)
• Add psc-package to release bundle (@marsam)
• Update for latest language-javascript (@tmcgilchrist)
• Fix exhaustivity warnings (@charleso)
• Update CONTRIBUTING.md (@osa1)