Starts a task for parallel compilation.

@spec compile(
  [Path.t()],
  keyword()
) ::
  {:ok, [atom()], [warning()] | info()}
  | {:error, [error()] | [Code.diagnostic(:error)], [warning()] | info()}

Compiles the given files.

Those files are compiled in parallel and can automatically detect dependencies between them. Once a dependency is found, the current file stops being compiled until the dependency is resolved.

It returns {:ok, modules, warnings} or {:error, errors, warnings} by default but we recommend using return_diagnostics: true so it returns diagnostics as maps as well as a map of compilation information. The map has the shape of:

%{
  runtime_warnings: [warning],
  compile_warnings: [warning]
}

Options

• :each_file - for each file compiled, invokes the callback passing the file

• :each_long_compilation - for each file that takes more than a given timeout (see the :long_compilation_threshold option) to compile, invoke this callback passing the file as its argument

• :each_module - for each module compiled, invokes the callback passing the file, module and the module bytecode

• :each_cycle - after the given files are compiled, invokes this function that should return the following values:

  • {:compile, modules, warnings} - to continue compilation with a list of further modules to compile
  • {:runtime, modules, warnings} - to stop compilation and verify the list of modules because dependent modules have changed

• :long_compilation_threshold - the timeout (in seconds) to check for modules taking too long to compile. For each file that exceeds the threshold, the :each_long_compilation callback is invoked. From Elixir v1.11, only the time spent compiling the actual module is taken into account by the threshold, the time spent waiting is not considered. Defaults to 10 seconds.

• :profile - if set to :time measure the compilation time of each compilation cycle and group pass checker

• :dest - the destination directory for the BEAM files. When using compile/2, this information is only used to properly annotate the BEAM files before they are loaded into memory. If you want a file to actually be written to dest, use compile_to_path/3 instead.

• :beam_timestamp - the modification timestamp to give all BEAM files

• :return_diagnostics (since v1.15.0) - returns maps with information instead of a list of warnings and returns diagnostics as maps instead of tuples

• :max_concurrency - the maximum number of files to compile in parallel. Setting this option to 1 will compile files sequentially. Defaults to the number of schedulers online, or at least 2.

@spec compile_to_path([Path.t()], Path.t(), keyword()) ::
  {:ok, [atom()], [warning()] | info()}
  | {:error, [error()] | [Code.diagnostic(:error)], [warning()] | info()}

Compiles the given files and writes resulting BEAM files into path.

See compile/2 for more information.

Perform parallel compilation of collection with fun.

If you have a file that needs to compile other modules in parallel, the spawned processes need to be aware of the compiler environment. This function allows a developer to perform such tasks.

@spec require(
  [Path.t()],
  keyword()
) ::
  {:ok, [atom()], [warning()] | info()}
  | {:error, [error()] | [Code.diagnostic(:error)], [warning()] | info()}

Requires the given files in parallel.

Opposite to compile, dependencies are not attempted to be automatically solved between files.

It returns {:ok, modules, warnings} or {:error, errors, warnings} by default but we recommend using return_diagnostics: true so it returns diagnostics as maps as well as a map of compilation information. The map has the shape of:

%{
  runtime_warnings: [warning],
  compile_warnings: [warning]
}

Options

• :each_file - for each file compiled, invokes the callback passing the file

• :each_module - for each module compiled, invokes the callback passing the file, module and the module bytecode

• :max_concurrency - the maximum number of files to compile in parallel. Setting this option to 1 will compile files sequentially. Defaults to the number of schedulers online, or at least 2.