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Changelog

Unreleased

Compiler

  • The compiler now reports an error when integer and float binary operators are used incorrectly in case expression guards. (Adi Salimgereyev)

  • The compiler now supports string concatenation in clause guards:

    case message {
  #(version, action) if version <> ":" <> action == "v1:delete" ->
    handle_delete()
  _ -> ignore()
}

    (Adi Salimgereyev)

  • Improved the code generated on the Erlang target when dividing a Float number by the literal number 0.0. (Giacomo Cavalieri)

Build tool

  • When adding a package that does not exist on Hex, the message is a bit friendlier. (Ameen Radwan)

  • The gleam.toml format is now consistent. The two sausage-case fields (dev-dependencies and tag-prefix) have been replaced by snake_case versions. Files using the old names will continue to work. (Louis Pilfold)

  • The password used for encrypting new local Hex API keys must now be at least 8 characters in length. (Louis Pilfold)

  • The build tool now emits errors for unknown fields in package config, except for the ones under [tools]. For example, with this:

    name = "hello"
version = "1.0.0"

[tools.my-tool]
my-awesome-setting = true

    Building the project won't give any errors. But with this:

    name = "hello"
version = "1.0.0"
my-awesome-setting = true

    Building the project will emit an error.

    (Andrey Kozhev)

  • When attempting to publish a package on Hex with an already taken name, the message is clearer. (vyacheslavhere)

  • The build tool now shows better error message on passing unexpected labeled arguments by taking into account, whether it's a function or a constructor. (Andrey Kozhev)

  • The build tool will now refuse to publish any package that has the default README generated by the gleam new command. (Giacomo Cavalieri)

  • The build tool will now refuse to publish any package that has no README, or an empty README. (Giacomo Cavalieri)

Language server

  • The language server now allows extracting the start of a pipeline into a variable. (Giacomo Cavalieri)

  • The language server is now smarter when producing autocompletions. Imagine you're updating your code to fully qualify the uses of the Json type:

    pub fn payload() -> js|Json
//                    ^ typing the module name

    Accepting the json.Json completion will now produce the correct json.Json annotation rather than generating invalid code: json.JsonJson.

    (Giacomo Cavalieri)

  • The language server now suggests adding missing type parameters to custom generic types. (Andi Pabst)

  • The Extract function code action now provides more ergonomic/idiomatic refactorings when used on anonymous functions. (Hari Mohan)

  • It's now possible to find references and rename variables in string prefix patterns.

    case wibble {
  "1" as digit <> rest -> digit <> rest
  //     ^^^^^    ^^^^
  // You can now trigger "Find references" and "Rename" from here
}

    (Igor Castejón)

  • The language server now offers a rename for module when the cursor is placed over its import statement or when placed on its name or alias somewhere. For example,

    import lustre/element
import lustre/element/html
import lustre/event

fn view(model: Int) -> element.Element(Msg) {
  //                     ^  Renaming module to `el` here
  let count = int.to_string(model)

  html.div([], [
    html.button([event.on_click(Incr)], [element.text(" + ")]),
    html.p([], [element.text(count)]),
    html.button([event.on_click(Decr)], [element.text(" - ")]),
  ])
}

    Using renaming when hovering on module name will would result in the following code:

    import lustre/element as el
import lustre/element/html
import lustre/event

fn view(model: Int) -> el.Element(Msg) {
  let count = int.to_string(model)

  html.div([], [
    html.button([event.on_click(Incr)], [el.text(" + ")]),
    html.p([], [el.text(count)]),
    html.button([event.on_click(Decr)], [el.text(" - ")]),
  ])
}

    (Vladislav Shakitskiy)

  • The "Fill labels" code action now uses variables from scope when they match the label name and expected type, using shorthand syntax (name:) instead of name: todo.

    (Vladislav Shakitskiy)

  • The "Interpolate String" code action now lets the user "cut out" any portion of a string, regardless of whether it is a valid Gleam identifier or not. (Hari Mohan)

  • When interpolating an expression at the very start or the very end of a string, redundant empty strings are no longer added before/after the interpolated expression. (Hari Mohan)

  • The language server now performs best-effort zero value generation for decode.failure when using the Generate Dynamic Decoder code action. (Hari Mohan)

  • The Generate Dynamic Decoder and Generate To-JSON Function code action now generate a decoder and an encoder, respectively, for Nil values. (Hari Mohan)

Formatter

Bug fixes

  • Fixed a bug where some bit array patterns would erroneously be marked as unreachable. (Giacomo Cavalieri)

  • Fixed a bug where the Gleam standard library's dict.each function would incorrectly be assumed to be pure. (Giacomo Cavalieri)

  • The compiler now correctly tracks the minimum required version for constant record updates to be >= 1.14.0. (Giacomo Cavalieri)

  • The compiler now correctly tracks the minimum required version for expressions in BitArrays' size option to be >= 1.12.0. (Giacomo Cavalieri)

  • Fixed a bug where the formatter would not properly format some function calls if the last argument was followed by a trailing comment. (Giacomo Cavalieri)

  • Fixed a bug where the compiler would generate invalid code on the JavaScript target when using a case expression as the right hand side of an equality check in an assert. (Giacomo Cavalieri)

  • Fixed a bug where the compiler would generate invalid code on the JavaScript target for some case expressions using clause guards. (Giacomo Cavalieri)

  • The formatter no longer stack overflows trying to format lists with many items. (Giacomo Cavalieri)

  • Fixed a bug where the formatter would not be able to consistently format a constant list with an @internal attribute. (Giacomo Cavalieri)

  • The "convert to pipe" code action now works on nested function calls as well, rather than always being applied to the outermost one. (Giacomo Cavalieri)

  • The language server no longer recommends the deprecated @target attribute. (Hari Mohan)

  • The compiler no longer crashes when trying to pattern match on a UtfCodepoint. (Hari Mohan)

  • Fixed a bug that would result in not being able to rename an aliased pattern. (Giacomo Cavalieri)

  • Fixed JavaScript codegen bug for assert when using && with comparison operators on the right side. (vyacheslavhere)

  • Added an error message when attempting to update packages that are not dependencies of the project, instead of failing silently. (Etienne Boutet, Vladislav Shakitskiy)

  • The build tool now doesn't perform code generation when exporting package interface. (Andrey Kozhev)

  • The "Extract constant" code action now correctly places new constant when function has documentation. For example,

    /// Wibble does some wobbling
pub fn wibble() {
  let x = "wobble"
  //  ^ Trigger "Extract constant" here
  x
}

    Previously, it would incorrectly place it below doc comment:

    /// Wibble does some wobbling
const x = "wobble"

pub fn wibble() {
  x
}

    Now it will correctly place constant above doc comment:

    const x = "wobble"

/// Wibble does some wobbling
pub fn wibble() {
  x
}

    (Andrey Kozhev)

  • Fixed a bug where renaming would not work properly if there was an error in target file. (Surya Rose)

  • Fixed a bug where generics in custom types would not be properly generated when emitting TypeScript declarations. (Surya Rose)

  • Fixed a bug where the package cache would not properly be reset when a version of a package was replaced on Hex. (Surya Rose)

  • Fixed a crash (bad_generator) that could occur when a linked OTP process exits with a non-standard exit reason. (John Downey)

  • Fixed a bug where diagnostic about incorrect size and unit options would use incorrect error location. (Andrey Kozhev)