Typed Ruby
RBS has its own syntax for defining Ruby types. The definitive source for the syntax reference is found at https://github.com/ruby/rbs/blob/master/docs/syntax.md. We’ll go over the structure here.
RBS Declarations and File Structure
RBS syntax has a few main parts (we’re adopting the naming convention from the official syntax file):
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Declarations are class, module, and interface structures that can be used as types in other parts of the file.
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Members are things that are inside declarations that might have type information, including instance variables, attributes, and methods.
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Types are the things that RBS uses to specify actual type information, including class names, union of class names, or literal types, as well as a few RBS-specific ...
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