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diff --git a/lib/prism.rb b/lib/prism.rb
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+# frozen_string_literal: true
+
+module YARP
+  # There are many files in YARP that are templated to handle every node type,
+  # which means the files can end up being quite large. We autoload them to make
+  # our require speed faster since consuming libraries are unlikely to use all
+  # of these features.
+  autoload :BasicVisitor, "yarp/visitor"
+  autoload :Compiler, "yarp/compiler"
+  autoload :Debug, "yarp/debug"
+  autoload :DesugarCompiler, "yarp/desugar_compiler"
+  autoload :Dispatcher, "yarp/dispatcher"
+  autoload :DSL, "yarp/dsl"
+  autoload :LexCompat, "yarp/lex_compat"
+  autoload :LexRipper, "yarp/lex_compat"
+  autoload :MutationCompiler, "yarp/mutation_compiler"
+  autoload :NodeInspector, "yarp/node_inspector"
+  autoload :RipperCompat, "yarp/ripper_compat"
+  autoload :Pack, "yarp/pack"
+  autoload :Pattern, "yarp/pattern"
+  autoload :Serialize, "yarp/serialize"
+  autoload :Visitor, "yarp/visitor"
+
+  # Some of these constants are not meant to be exposed, so marking them as
+  # private here.
+  private_constant :Debug
+  private_constant :LexCompat
+  private_constant :LexRipper
+
+  # Returns an array of tokens that closely resembles that of the Ripper lexer.
+  # The only difference is that since we don't keep track of lexer state in the
+  # same way, it's going to always return the NONE state.
+  def self.lex_compat(source, filepath = "")
+    LexCompat.new(source, filepath).result
+  end
+
+  # This lexes with the Ripper lex. It drops any space events but otherwise
+  # returns the same tokens. Raises SyntaxError if the syntax in source is
+  # invalid.
+  def self.lex_ripper(source)
+    LexRipper.new(source).result
+  end
+
+  # Load the serialized AST using the source as a reference into a tree.
+  def self.load(source, serialized)
+    Serialize.load(source, serialized)
+  end
+end
+
+require_relative "yarp/node"
+require_relative "yarp/node_ext"
+require_relative "yarp/parse_result"
+require_relative "yarp/parse_result/comments"
+require_relative "yarp/parse_result/newlines"
+
+# This is a Ruby implementation of the YARP parser. If we're running on CRuby
+# and we haven't explicitly set the YARP_FFI_BACKEND environment variable, then
+# it's going to require the built library. Otherwise, it's going to require a
+# module that uses FFI to call into the library.
+if RUBY_ENGINE == "ruby" and !ENV["YARP_FFI_BACKEND"]
+  require "yarp/yarp"
+else
+  require_relative "yarp/ffi"
+end