lib.unifyModuleSyntax

The following is the current implementation of this function.

unifyModuleSyntax = file: key: m:
    let
      addMeta = config: if m ? meta
        then mkMerge [ config { meta = m.meta; } ]
        else config;
      addFreeformType = config: if m ? freeformType
        then mkMerge [ config { _module.freeformType = m.freeformType; } ]
        else config;
    in
    if m ? config || m ? options then
      let badAttrs = removeAttrs m ["_class" "_file" "key" "disabledModules" "imports" "options" "config" "meta" "freeformType"]; in
      if badAttrs != {} then
        throw "Module `${key}' has an unsupported attribute `${head (attrNames badAttrs)}'. This is caused by introducing a top-level `config' or `options' attribute. Add configuration attributes immediately on the top level instead, or move all of them (namely: ${toString (attrNames badAttrs)}) into the explicit `config' attribute."
      else
        { _file = toString m._file or file;
          _class = m._class or null;
          key = toString m.key or key;
          disabledModules = m.disabledModules or [];
          imports = m.imports or [];
          options = m.options or {};
          config = addFreeformType (addMeta (m.config or {}));
        }
    else
      # shorthand syntax
      throwIfNot (isAttrs m) "module ${file} (${key}) does not look like a module."
      { _file = toString m._file or file;
        _class = m._class or null;
        key = toString m.key or key;
        disabledModules = m.disabledModules or [];
        imports = m.require or [] ++ m.imports or [];
        options = {};
        config = addFreeformType (removeAttrs m ["_class" "_file" "key" "disabledModules" "require" "imports" "freeformType"]);
      };