diff --git a/packages/react-native-codegen/android/gradlePlugin-build/gradlePlugin/src/main/java/com/facebook/react/codegen/generator/model/AliasType.java b/packages/react-native-codegen/android/gradlePlugin-build/gradlePlugin/src/main/java/com/facebook/react/codegen/generator/model/AliasType.java
new file mode 100644
index 00000000000..2915cdabdf9
--- /dev/null
+++ b/packages/react-native-codegen/android/gradlePlugin-build/gradlePlugin/src/main/java/com/facebook/react/codegen/generator/model/AliasType.java
@@ -0,0 +1,18 @@
+/*
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+package com.facebook.react.codegen.generator.model;
+
+public final class AliasType extends Type {
+
+  public final TypeId referredTypeId;
+
+  public AliasType(final TypeId typeId, final TypeId referredTypeId) {
+    super(typeId);
+    this.referredTypeId = referredTypeId;
+  }
+}
diff --git a/packages/react-native-codegen/android/gradlePlugin-build/gradlePlugin/src/main/java/com/facebook/react/codegen/generator/model/AnyType.java b/packages/react-native-codegen/android/gradlePlugin-build/gradlePlugin/src/main/java/com/facebook/react/codegen/generator/model/AnyType.java
new file mode 100644
index 00000000000..d26fd527e77
--- /dev/null
+++ b/packages/react-native-codegen/android/gradlePlugin-build/gradlePlugin/src/main/java/com/facebook/react/codegen/generator/model/AnyType.java
@@ -0,0 +1,15 @@
+/*
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+package com.facebook.react.codegen.generator.model;
+
+public final class AnyType extends Type {
+
+  public AnyType(final TypeId typeId) {
+    super(typeId);
+  }
+}
diff --git a/packages/react-native-codegen/android/gradlePlugin-build/gradlePlugin/src/main/java/com/facebook/react/codegen/generator/model/ArrayType.java b/packages/react-native-codegen/android/gradlePlugin-build/gradlePlugin/src/main/java/com/facebook/react/codegen/generator/model/ArrayType.java
new file mode 100644
index 00000000000..58af1236956
--- /dev/null
+++ b/packages/react-native-codegen/android/gradlePlugin-build/gradlePlugin/src/main/java/com/facebook/react/codegen/generator/model/ArrayType.java
@@ -0,0 +1,18 @@
+/*
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+package com.facebook.react.codegen.generator.model;
+
+public final class ArrayType extends Type {
+
+  public final Type elementType;
+
+  public ArrayType(final TypeId typeId, final Type elementType) {
+    super(typeId);
+    this.elementType = elementType;
+  }
+}
diff --git a/packages/react-native-codegen/android/gradlePlugin-build/gradlePlugin/src/main/java/com/facebook/react/codegen/generator/model/BooleanType.java b/packages/react-native-codegen/android/gradlePlugin-build/gradlePlugin/src/main/java/com/facebook/react/codegen/generator/model/BooleanType.java
new file mode 100644
index 00000000000..ae5de917064
--- /dev/null
+++ b/packages/react-native-codegen/android/gradlePlugin-build/gradlePlugin/src/main/java/com/facebook/react/codegen/generator/model/BooleanType.java
@@ -0,0 +1,15 @@
+/*
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+package com.facebook.react.codegen.generator.model;
+
+public final class BooleanType extends Type {
+
+  public BooleanType(final TypeId typeId) {
+    super(typeId);
+  }
+}
diff --git a/packages/react-native-codegen/android/gradlePlugin-build/gradlePlugin/src/main/java/com/facebook/react/codegen/generator/model/DoubleType.java b/packages/react-native-codegen/android/gradlePlugin-build/gradlePlugin/src/main/java/com/facebook/react/codegen/generator/model/DoubleType.java
new file mode 100644
index 00000000000..2cb8aa08c98
--- /dev/null
+++ b/packages/react-native-codegen/android/gradlePlugin-build/gradlePlugin/src/main/java/com/facebook/react/codegen/generator/model/DoubleType.java
@@ -0,0 +1,15 @@
+/*
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+package com.facebook.react.codegen.generator.model;
+
+public final class DoubleType extends NumberType {
+
+  public DoubleType(final TypeId typeId) {
+    super(typeId);
+  }
+}
diff --git a/packages/react-native-codegen/android/gradlePlugin-build/gradlePlugin/src/main/java/com/facebook/react/codegen/generator/model/FloatType.java b/packages/react-native-codegen/android/gradlePlugin-build/gradlePlugin/src/main/java/com/facebook/react/codegen/generator/model/FloatType.java
new file mode 100644
index 00000000000..198872f227c
--- /dev/null
+++ b/packages/react-native-codegen/android/gradlePlugin-build/gradlePlugin/src/main/java/com/facebook/react/codegen/generator/model/FloatType.java
@@ -0,0 +1,15 @@
+/*
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+package com.facebook.react.codegen.generator.model;
+
+public final class FloatType extends NumberType {
+
+  public FloatType(final TypeId typeId) {
+    super(typeId);
+  }
+}
diff --git a/packages/react-native-codegen/android/gradlePlugin-build/gradlePlugin/src/main/java/com/facebook/react/codegen/generator/model/FunctionType.java b/packages/react-native-codegen/android/gradlePlugin-build/gradlePlugin/src/main/java/com/facebook/react/codegen/generator/model/FunctionType.java
new file mode 100644
index 00000000000..bc40e8d9c88
--- /dev/null
+++ b/packages/react-native-codegen/android/gradlePlugin-build/gradlePlugin/src/main/java/com/facebook/react/codegen/generator/model/FunctionType.java
@@ -0,0 +1,71 @@
+/*
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+package com.facebook.react.codegen.generator.model;
+
+import java.util.Collections;
+import java.util.List;
+import java.util.Objects;
+
+public final class FunctionType extends Type {
+
+  public static class ArgumentType {
+    public final String name;
+    public final Type type;
+
+    private ArgumentType(String name, Type type) {
+      this.name = name;
+      this.type = type;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+      if (this == o) {
+        return true;
+      }
+      if (o == null || getClass() != o.getClass()) {
+        return false;
+      }
+
+      ArgumentType that = (ArgumentType) o;
+      return Objects.equals(this.name, that.name) && Objects.equals(this.type, that.type);
+    }
+
+    @Override
+    public int hashCode() {
+      return Objects.hash(name, type);
+    }
+  }
+
+  public final List<ArgumentType> parameters;
+  public final Type returnType;
+
+  public FunctionType(final TypeId typeId, List<ArgumentType> parameters, Type returnType) {
+    super(typeId);
+    this.parameters = Collections.unmodifiableList(parameters);
+    this.returnType = returnType;
+  }
+
+  @Override
+  public boolean equals(Object o) {
+    if (this == o) {
+      return true;
+    }
+    if (o == null || getClass() != o.getClass() || !super.equals(o)) {
+      return false;
+    }
+
+    FunctionType that = (FunctionType) o;
+    return Objects.equals(this.parameters, that.parameters)
+        && Objects.equals(this.returnType, that.returnType);
+  }
+
+  @Override
+  public int hashCode() {
+    return Objects.hash(super.hashCode(), parameters, returnType);
+  }
+}
diff --git a/packages/react-native-codegen/android/gradlePlugin-build/gradlePlugin/src/main/java/com/facebook/react/codegen/generator/model/GenericObjectType.java b/packages/react-native-codegen/android/gradlePlugin-build/gradlePlugin/src/main/java/com/facebook/react/codegen/generator/model/GenericObjectType.java
new file mode 100644
index 00000000000..f9995a68f2e
--- /dev/null
+++ b/packages/react-native-codegen/android/gradlePlugin-build/gradlePlugin/src/main/java/com/facebook/react/codegen/generator/model/GenericObjectType.java
@@ -0,0 +1,15 @@
+/*
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+package com.facebook.react.codegen.generator.model;
+
+public final class GenericObjectType extends Type {
+
+  public GenericObjectType(final TypeId typeId) {
+    super(typeId);
+  }
+}
diff --git a/packages/react-native-codegen/android/gradlePlugin-build/gradlePlugin/src/main/java/com/facebook/react/codegen/generator/model/Int32Type.java b/packages/react-native-codegen/android/gradlePlugin-build/gradlePlugin/src/main/java/com/facebook/react/codegen/generator/model/Int32Type.java
new file mode 100644
index 00000000000..72afa7c8d85
--- /dev/null
+++ b/packages/react-native-codegen/android/gradlePlugin-build/gradlePlugin/src/main/java/com/facebook/react/codegen/generator/model/Int32Type.java
@@ -0,0 +1,15 @@
+/*
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+package com.facebook.react.codegen.generator.model;
+
+public final class Int32Type extends NumberType {
+
+  public Int32Type(final TypeId typeId) {
+    super(typeId);
+  }
+}
diff --git a/packages/react-native-codegen/android/gradlePlugin-build/gradlePlugin/src/main/java/com/facebook/react/codegen/generator/model/NumberType.java b/packages/react-native-codegen/android/gradlePlugin-build/gradlePlugin/src/main/java/com/facebook/react/codegen/generator/model/NumberType.java
new file mode 100644
index 00000000000..11770f829fe
--- /dev/null
+++ b/packages/react-native-codegen/android/gradlePlugin-build/gradlePlugin/src/main/java/com/facebook/react/codegen/generator/model/NumberType.java
@@ -0,0 +1,15 @@
+/*
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+package com.facebook.react.codegen.generator.model;
+
+public class NumberType extends Type {
+
+  public NumberType(final TypeId typeId) {
+    super(typeId);
+  }
+}
diff --git a/packages/react-native-codegen/android/gradlePlugin-build/gradlePlugin/src/main/java/com/facebook/react/codegen/generator/model/ObjectType.java b/packages/react-native-codegen/android/gradlePlugin-build/gradlePlugin/src/main/java/com/facebook/react/codegen/generator/model/ObjectType.java
new file mode 100644
index 00000000000..940cdd5a9c4
--- /dev/null
+++ b/packages/react-native-codegen/android/gradlePlugin-build/gradlePlugin/src/main/java/com/facebook/react/codegen/generator/model/ObjectType.java
@@ -0,0 +1,32 @@
+/*
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+package com.facebook.react.codegen.generator.model;
+
+public final class ObjectType extends Type {
+
+  public ObjectType(final TypeId typeId) {
+    super(typeId);
+  }
+
+  public static class Property {
+    public final String propertyName;
+    public final Type type;
+    public final boolean optional;
+
+    public Property(String propertyName, Type type, boolean optional) {
+      this.propertyName = propertyName;
+      this.type = type;
+      this.optional = optional;
+    }
+
+    @Override
+    public String toString() {
+      return propertyName + " " + type;
+    }
+  }
+}
diff --git a/packages/react-native-codegen/android/gradlePlugin-build/gradlePlugin/src/main/java/com/facebook/react/codegen/generator/model/ReservedFunctionValueType.java b/packages/react-native-codegen/android/gradlePlugin-build/gradlePlugin/src/main/java/com/facebook/react/codegen/generator/model/ReservedFunctionValueType.java
new file mode 100644
index 00000000000..8664fd10df1
--- /dev/null
+++ b/packages/react-native-codegen/android/gradlePlugin-build/gradlePlugin/src/main/java/com/facebook/react/codegen/generator/model/ReservedFunctionValueType.java
@@ -0,0 +1,21 @@
+/*
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+package com.facebook.react.codegen.generator.model;
+
+public final class ReservedFunctionValueType extends Type {
+  public enum ReservedName {
+    RootTag,
+  }
+
+  public ReservedName reservedName;
+
+  public ReservedFunctionValueType(final TypeId typeId, ReservedName reservedName) {
+    super(typeId);
+    this.reservedName = reservedName;
+  }
+}
diff --git a/packages/react-native-codegen/android/gradlePlugin-build/gradlePlugin/src/main/java/com/facebook/react/codegen/generator/model/StringType.java b/packages/react-native-codegen/android/gradlePlugin-build/gradlePlugin/src/main/java/com/facebook/react/codegen/generator/model/StringType.java
new file mode 100644
index 00000000000..897e8d9fef7
--- /dev/null
+++ b/packages/react-native-codegen/android/gradlePlugin-build/gradlePlugin/src/main/java/com/facebook/react/codegen/generator/model/StringType.java
@@ -0,0 +1,15 @@
+/*
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+package com.facebook.react.codegen.generator.model;
+
+public final class StringType extends Type {
+
+  public StringType(final TypeId typeId) {
+    super(typeId);
+  }
+}
diff --git a/packages/react-native-codegen/android/gradlePlugin-build/gradlePlugin/src/main/java/com/facebook/react/codegen/generator/model/Type.java b/packages/react-native-codegen/android/gradlePlugin-build/gradlePlugin/src/main/java/com/facebook/react/codegen/generator/model/Type.java
new file mode 100644
index 00000000000..bf1b6d087b5
--- /dev/null
+++ b/packages/react-native-codegen/android/gradlePlugin-build/gradlePlugin/src/main/java/com/facebook/react/codegen/generator/model/Type.java
@@ -0,0 +1,44 @@
+/*
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+package com.facebook.react.codegen.generator.model;
+
+import java.util.Objects;
+
+public abstract class Type {
+  protected final TypeId mTypeId;
+
+  public Type(final TypeId typeId) {
+    mTypeId = typeId;
+  }
+
+  public TypeId getTypeId() {
+    return mTypeId;
+  }
+
+  @Override
+  public String toString() {
+    return mTypeId.toString();
+  }
+
+  @Override
+  public boolean equals(final Object o) {
+    if (this == o) {
+      return true;
+    }
+    if (o == null || getClass() != o.getClass()) {
+      return false;
+    }
+    final Type type = (Type) o;
+    return Objects.equals(mTypeId, type.mTypeId);
+  }
+
+  @Override
+  public int hashCode() {
+    return Objects.hash(mTypeId);
+  }
+}
diff --git a/packages/react-native-codegen/android/gradlePlugin-build/gradlePlugin/src/main/java/com/facebook/react/codegen/generator/model/TypeId.java b/packages/react-native-codegen/android/gradlePlugin-build/gradlePlugin/src/main/java/com/facebook/react/codegen/generator/model/TypeId.java
new file mode 100644
index 00000000000..bbec7886106
--- /dev/null
+++ b/packages/react-native-codegen/android/gradlePlugin-build/gradlePlugin/src/main/java/com/facebook/react/codegen/generator/model/TypeId.java
@@ -0,0 +1,66 @@
+/*
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+package com.facebook.react.codegen.generator.model;
+
+import java.util.Objects;
+import javax.annotation.Nullable;
+
+/** Represents the fully qualified name for a Flow type. */
+public final class TypeId {
+  public final String moduleName;
+  public final String typeName;
+
+  private static final String EMPTY_TYPE_NAME = "";
+
+  private TypeId(final String moduleName, final String typeName) {
+    this.moduleName = moduleName;
+    this.typeName = typeName;
+  }
+
+  public static TypeId of(final String moduleName) {
+    return new TypeId(moduleName, EMPTY_TYPE_NAME);
+  }
+
+  public static TypeId of(final String moduleName, @Nullable final String typeName) {
+    if (typeName == null) {
+      return TypeId.of(moduleName);
+    }
+
+    if (moduleName.equals(typeName)) {
+      return TypeId.of(moduleName);
+    }
+
+    return new TypeId(moduleName, typeName);
+  }
+
+  @Override
+  public String toString() {
+    return String.format(
+        "<moduleName = %s, typeName = %s>",
+        moduleName, EMPTY_TYPE_NAME.equals(typeName) ? moduleName : typeName);
+  }
+
+  @Override
+  public boolean equals(final Object o) {
+    if (this == o) {
+      return true;
+    }
+    if (o == null || getClass() != o.getClass()) {
+      return false;
+    }
+
+    final TypeId typeId = (TypeId) o;
+    return Objects.equals(moduleName, typeId.moduleName)
+        && Objects.equals(typeName, typeId.typeName);
+  }
+
+  @Override
+  public int hashCode() {
+    return Objects.hash(moduleName, typeName);
+  }
+}
diff --git a/packages/react-native-codegen/android/gradlePlugin-build/gradlePlugin/src/main/java/com/facebook/react/codegen/generator/model/VoidType.java b/packages/react-native-codegen/android/gradlePlugin-build/gradlePlugin/src/main/java/com/facebook/react/codegen/generator/model/VoidType.java
new file mode 100644
index 00000000000..1e6f7d460c5
--- /dev/null
+++ b/packages/react-native-codegen/android/gradlePlugin-build/gradlePlugin/src/main/java/com/facebook/react/codegen/generator/model/VoidType.java
@@ -0,0 +1,15 @@
+/*
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+package com.facebook.react.codegen.generator.model;
+
+public final class VoidType extends Type {
+
+  public VoidType(final TypeId typeId) {
+    super(typeId);
+  }
+}