diff --git a/lib/schemable/constants.rb b/lib/schemable/constants.rb
new file mode 100644
index 0000000..92bfca4
--- /dev/null
+++ b/lib/schemable/constants.rb
@@ -0,0 +1,41 @@
+module Schemable
+  module Constants
+    TYPES_MAP = {
+      text: { type: :string },
+      string: { type: :string },
+      integer: { type: :integer },
+      boolean: { type: :boolean },
+      date: { type: :string, format: :date },
+      time: { type: :string, format: :time },
+      json: { type: :object, properties: {} },
+      hash: { type: :object, properties: {} },
+      jsonb: { type: :object, properties: {} },
+      object: { type: :object, properties: {} },
+      binary: { type: :string, format: :binary },
+      trueclass: { type: :boolean, default: true },
+      falseclass: { type: :boolean, default: false },
+      datetime: { type: :string, format: :'date-time' },
+      float: {
+        type: (configs[:float_as_string] ? :string : :number).to_s.to_sym,
+        format: :float
+      },
+      decimal: {
+        type: (configs[:decimal_as_string] ? :string : :number).to_s.to_sym,
+        format: :double
+      },
+      array: {
+        type: :array,
+        items: {
+          anyOf: [
+            { type: :string },
+            { type: :integer },
+            { type: :boolean },
+            { type: :number, format: :float },
+            { type: :object, properties: {} },
+            { type: :number, format: :double }
+          ]
+        }
+      }
+    }.freeze
+  end
+end
diff --git a/sig/schemable/constants.rbs b/sig/schemable/constants.rbs
new file mode 100644
index 0000000..cf93edf
--- /dev/null
+++ b/sig/schemable/constants.rbs
@@ -0,0 +1,5 @@
+module Schemable
+  module Constants
+    TYPES_MAP: Hash[Symbol, Symbol | Object]
+  end
+end