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diff --git a/lib/prism.rb b/lib/prism.rb
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+# frozen_string_literal: true
+
+# The Prism Ruby parser.
+#
+# "Parsing Ruby is suddenly manageable!"
+#   - You, hopefully
+#
+module Prism
+  # There are many files in prism 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, "prism/visitor"
+  autoload :Compiler, "prism/compiler"
+  autoload :Debug, "prism/debug"
+  autoload :DesugarCompiler, "prism/desugar_compiler"
+  autoload :Dispatcher, "prism/dispatcher"
+  autoload :DotVisitor, "prism/dot_visitor"
+  autoload :DSL, "prism/dsl"
+  autoload :InspectVisitor, "prism/inspect_visitor"
+  autoload :LexCompat, "prism/lex_compat"
+  autoload :LexRipper, "prism/lex_compat"
+  autoload :MutationCompiler, "prism/mutation_compiler"
+  autoload :Pack, "prism/pack"
+  autoload :Pattern, "prism/pattern"
+  autoload :Reflection, "prism/reflection"
+  autoload :Serialize, "prism/serialize"
+  autoload :Translation, "prism/translation"
+  autoload :Visitor, "prism/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
+
+  # :call-seq:
+  #   Prism::lex_compat(source, **options) -> LexCompat::Result
+  #
+  # Returns a parse result whose value is an array of tokens that closely
+  # resembles the return value of Ripper::lex. The main difference is that the
+  # `:on_sp` token is not emitted.
+  #
+  # For supported options, see Prism::parse.
+  def self.lex_compat(source, **options)
+    LexCompat.new(source, **options).result # steep:ignore
+  end
+
+  # :call-seq:
+  #   Prism::lex_ripper(source) -> Array
+  #
+  # 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 # steep:ignore
+  end
+
+  # :call-seq:
+  #   Prism::load(source, serialized) -> ParseResult
+  #
+  # 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 "prism/node"
+require_relative "prism/node_ext"
+require_relative "prism/parse_result"
+require_relative "prism/parse_result/comments"
+require_relative "prism/parse_result/newlines"
+
+# This is a Ruby implementation of the prism parser. If we're running on CRuby
+# and we haven't explicitly set the PRISM_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["PRISM_FFI_BACKEND"]
+  require "prism/prism"
+
+  # The C extension is the default backend on CRuby.
+  Prism::BACKEND = :CEXT
+else
+  require_relative "prism/ffi"
+
+  # The FFI backend is used on other Ruby implementations.
+  Prism::BACKEND = :FFI
+end