1.19.0

Released on 2025-10-16

Changes

Type: enhancement
Tool: Elixir
Module: Access
Description: Add `Access.values/0` for traversing maps and keyword lists values
Type: enhancement
Tool: Elixir
Module: Base
Description: Add functions to verify if an encoding is valid, such as `valid16?`, `valid64?`, and so forth
Type: enhancement
Tool: Elixir
Module: Calendar
Description: Support 2-arity options for `Calendar.strftime/3` which receives the whole data type
Type: enhancement
Tool: Elixir
Module: Code
Description: Add `:migrate_call_parens_on_pipe` formatter option
Type: enhancement
Tool: Elixir
Module: Code
Description: Add `:indentation` option to Code.string_to_quoted/2
Type: enhancement
Tool: Elixir
Module: Code.Fragment
Description: Preserve more block content around cursor in `container_cursor_to_quoted`
Type: enhancement
Tool: Elixir
Module: Code.Fragment
Description: Add `:block_keyword_or_binary_operator` to `Code.Fragment` for more precise suggestions after operators and closing terminators
Type: enhancement
Tool: Elixir
Module: Code.Fragment
Description: Add `Code.Fragment.lines/1`
Type: enhancement
Tool: Elixir
Module: Enum
Description: Provide more information on `Enum.OutOfBoundsError`
Type: enhancement
Tool: Elixir
Module: Inspect
Description: Allow `optional: :all` when deriving Inspect
Type: enhancement
Tool: Elixir
Module: Inspect.Algebra
Description: Add optimistic/pessimistic groups as a simplified implementation of `next_break_fits`
Type: enhancement
Tool: Elixir
Module: IO.ANSI
Description: Add ANSI codes to turn off conceal and crossed_out
Type: enhancement
Tool: Elixir
Module: Kernel
Description: Raise when U+2028 and U+2029 characters are present in comments and strings to avoid line spoofing attacks
Type: enhancement
Tool: Elixir
Module: Kernel
Description: Include the line for the previous clause in errors/warnings related to conflicts between defaults on function definitions
Type: enhancement
Tool: Elixir
Module: Kernel
Description: Support `min/2` and `max/2` as guards
Type: enhancement
Tool: Elixir
Module: Kernel.ParallelCompiler
Description: Add `each_long_verification_threshold` which invokes a callback when type checking a module takes too long
Type: enhancement
Tool: Elixir
Module: Kernel.ParallelCompiler
Description: Include lines in `== Compilation error in file ... ==` slogans
Type: enhancement
Tool: Elixir
Module: Macro
Description: Print debugging results from `Macro.dbg/3` as they happen, instead of once at the end
Type: enhancement
Tool: Elixir
Module: Macro
Description: Add `__escape__/1` callback so structs can escape references and other runtime data types in `Macro.escape/1`
Type: enhancement
Tool: Elixir
Module: Module
Description: Do not automatically load modules after their compilation, guaranteeing a more consistent compile time experience and drastically improving compilation times
Type: enhancement
Tool: Elixir
Module: OptionParser
Description: Support the `:regex` type
Type: enhancement
Tool: Elixir
Module: OptionParser
Description: Enhance parsing error to display available options
Type: enhancement
Tool: Elixir
Module: Protocol
Description: Type checking of protocols dispatch and implementations
Type: enhancement
Tool: Elixir
Module: Regex
Description: Add `Regex.to_embed/2` which returns an embeddable representation of regex in another regex
Type: enhancement
Tool: Elixir
Module: Regex
Description: Raise error message when regexes are used as default values in struct fields for compatibility with Erlang/OTP 28
Type: enhancement
Tool: Elixir
Module: Registry
Description: Add key-based partitioning of duplicate registries
Type: enhancement
Tool: Elixir
Module: String
Description: Add `String.count/2` to count occurrences of a pattern
Type: enhancement
Tool: Elixir
Module: String
Description: Update to Unicode 17.0.0
Type: enhancement
Tool: ExUnit
Module: ExUnit
Description: Set a process label for each test
Type: enhancement
Tool: ExUnit
Module: ExUnit.CaptureLog
Description: Parallelize log dispatch when multiple processes are capturing log
Type: enhancement
Tool: ExUnit
Module: ExUnit.Case
Description: Add `:test_group` to the test context
Type: enhancement
Tool: ExUnit
Module: ExUnit.Doctest
Description: Support ellipsis in doctest exceptions to match the remaining of the exception
Type: enhancement
Tool: ExUnit
Module: ExUnit.Doctest
Description: Add `:inspect_opts` option for doctest
Type: enhancement
Tool: IEx
Module: IEx
Description: Support multi-line prompts (due to this feature, `:continuation_prompt` and `:alive_continuation_prompt` are no longer supported as IEx configuration)
Type: enhancement
Tool: IEx
Module: IEx.Autocomplete
Description: Functions annotated with `@doc group: "Name"` metadata will appear within their own groups in autocompletion
Type: enhancement
Tool: Logger
Module: Logger
Description: Accept any enumerable in `Logger.metadata/1`
Type: enhancement
Tool: Mix
Module: mix
Description: Add support for `MIX_PROFILE_FLAGS` to configure `MIX_PROFILE`
Type: enhancement
Tool: Mix
Module: mix compile
Description: Debug the compiler and type checker PID when `MIX_DEBUG=1` and compilation/verification thresholds are met
Type: enhancement
Tool: Mix
Module: mix compile
Description: Add `Mix.Tasks.Compiler.reenable/1`
Type: enhancement
Tool: Mix
Module: mix deps.compile
Description: Support `MIX_OS_DEPS_COMPILE_PARTITION_COUNT` for compiling deps concurrently across multiple operating system processes
Type: enhancement
Tool: Mix
Module: mix help
Description: Add `mix help Mod`, `mix help :mod`, `mix help Mod.fun`, `mix help Mod.fun/arity`, and `mix help app:package`
Type: enhancement
Tool: Mix
Module: mix format
Description: Add options to mix format to allow excluding of files
Type: enhancement
Tool: Mix
Module: mix test
Description: Add `--name-pattern` option to mix test
Type: enhancement
Tool: Mix
Module: mix test
Description: Allow to distinguish the exit status between warnings as errors and test failures
Type: enhancement
Tool: Mix
Module: mix xref graph
Description: Add support for `--format json`
Type: enhancement
Tool: Mix
Module: mix xref graph
Description: Emit a warning if `--source` is part of a cycle
Type: enhancement
Tool: Mix
Module: Mix
Description: Support the `:compilers` option
Type: enhancement
Tool: Mix
Module: Mix.Task.Compiler
Description: Add `Mix.Task.Compiler.run/2`
Type: bugfix
Tool: Elixir
Module: Code
Description: Return error on invalid unicode sequences in `Code.string_to_quoted/2` instead of raising
Type: bugfix
Tool: Elixir
Module: Code
Description: Properly handle column annotation for `in` in `not in` expressions
Type: bugfix
Tool: Elixir
Module: DateTime
Description: Do not truncate microseconds regardless of precision in `DateTime.diff/3`
Type: bugfix
Tool: Elixir
Module: Enum
Description: Fix infinite loop on `Enum.take/2` with negative index on empty enumerable
Type: bugfix
Tool: Elixir
Module: File
Description: Properly handle permissions errors cascading from parent in `File.mkdir_p/1`
Type: bugfix
Tool: Elixir
Module: Inspect
Description: Inspect ill-formed structs as maps
Type: bugfix
Tool: Elixir
Module: Kernel
Description: Properly increment metadata newline when `?` is followed by a literal newline character
Type: bugfix
Tool: Elixir
Module: Kernel
Description: `not_a_map.key` now raises `BadMapError` for consistency with other map operations
Type: bugfix
Tool: Elixir
Module: Protocol
Description: `defstruct/1` and `defexception/1` are now disabled inside `defprotocol` as to not allow defining structs/exceptions alongside a protocol
Type: bugfix
Tool: Elixir
Module: Regex
Description: Fix `Regex.split/2` returning too many results when the chunk being split on was empty (which can happen when using features such as `/K`)
Type: bugfix
Tool: Elixir
Module: Stream
Description: Ensure `Stream.transform/5` respects suspend command when its inner stream halts
Type: bugfix
Tool: Elixir
Module: URI
Description: Several fixes to `URI.merge/2` related to trailing slashes, trailing dots, and hostless base URIs
Type: bugfix
Tool: ExUnit
Module: ExUnit.Assertions
Description: Fix order of pinned variables in failure reports
Type: bugfix
Tool: ExUnit
Module: ExUnit.Assertions
Description: Raise if attempting to raise an assertion error with invalid message (not a binary)
Type: bugfix
Tool: ExUnit
Module: ExUnit.Case
Description: Do not crash on empty test unit groups
Type: bugfix
Tool: IEx
Module: IEx
Description: Abort pipelines when there is an error in any step along the way
Type: bugfix
Tool: Mix
Module: mix cmd
Description: Preserve argument quoting in subcommands by no longer performing shell expansion. To revert to the previous behaviour, pass `--shell` before the command name
Type: bugfix
Tool: Mix
Module: mix compile
Description: Fix bug where reverting changes to an external resource (such as HEEx template) after a compilation error would make it so the source module would not be compiled
Type: bugfix
Tool: Mix
Module: mix compile
Description: Avoid failures when locking compilation across different users
Type: bugfix
Tool: Mix
Module: mix compile
Description: Fix race condition when renaming files used by the compilation lock
Type: bugfix
Tool: Mix
Module: mix format
Description: Ensure the formatter does not go over the specified limit in certain corner cases
Type: bugfix
Tool: Mix
Module: mix release
Description: Fix `RELEASE_SYS_CONFIG` for Windows 11
Type: bugfix
Tool: Mix
Module: mix test
Description: Ensure modules are preloaded in `mix test --slowest-modules=N`
Type: bugfix
Tool: Mix
Module: mix xref graph
Description: Provide more consistent output by considering strong connected components only when computing graphs
Type: soft_deprecation
Tool: Elixir
Module: Inspect.Algebra
Description: `next_break_fits` is deprecated in favor of `optimistic`/`pessimistic` groups
Type: soft_deprecation
Tool: Elixir
Module: Node
Description: `Node.start/2-3` is deprecated in favor of `Node.start/2` with a keyword list
Type: soft_deprecation
Tool: Mix
Module: mix compile
Description: `--no-protocol-consolidation` is deprecated in favor of `--no-consolidate-protocols` for consistency with `mix.exs` configuration
Type: soft_deprecation
Tool: Mix
Module: mix compile.protocols
Description: Protocol consolidation is now part of `compile.elixir` and the task itself has no effect
Type: hard_deprecation
Tool: Elixir
Module: Code
Description: Warn if line-break characters outside of `\r` and `\r\n` are found in strings according to UX#55. This warning will be fast-tracked into an error for security reasons in Elixir v1.20, following a similar rule to bidirectional control characters. They will already raise if found in comments
Type: hard_deprecation
Tool: Elixir
Module: Code
Description: The `on_undefined_variable: :warn` is deprecated. Relying on undefined variables becoming function calls will not be supported in the future
Type: hard_deprecation
Tool: Elixir
Module: File
Description: Passing a callback as third argument to `File.cp/3` is deprecated, pass it as a `on_conflict: callback` option instead
Type: hard_deprecation
Tool: Elixir
Module: File
Description: Passing a callback as third argument to `File.cp_r/3` is deprecated, pass it as a `on_conflict: callback` option instead
Type: hard_deprecation
Tool: Elixir
Module: Kernel
Description: The struct update syntax, such as `%URI{uri | path: "/foo/bar"}`, now requires the given variable (or expression) to explicitly pattern match on the struct before it can be updated. This is because, thanks to the type system, pattern matching on structs can find more errors, more reliably, and we want to promote its usage. Once pattern matching is added, you may optionally convert the struct update syntax into the map update syntax `%{uri | path: "/foo/bar"}` with no less of typing guarantees
Type: hard_deprecation
Tool: Elixir
Module: Kernel.ParallelCompiler
Description: Passing `return_diagnostics: true` as an option is required on `compile`, `compile_to_path` and `require`
Type: hard_deprecation
Tool: Logger
Module: Logger
Description: The `:backends` configuration is deprecated, either set the :default_handler to false or start backends in your application start callback
Type: hard_deprecation
Tool: Mix
Module: mix
Description: The `:default_task`, `:preferred_cli_env`, and :preferred_cli_target configuration inside `def project` in your `mix.exs` has been deprecated in favor of `:default_task`, `:preferred_envs` and `:preferred_targets` inside the `def cli` function
Type: hard_deprecation
Tool: Mix
Module: mix do
Description: Using commas as task separator in `mix do` (such as `mix do foo, bar`) is deprecated, use `+` instead (as in `mix do foo + bar`)