diff --git a/package-lock.json b/package-lock.json
index b7e99ae..7278ab6 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "garph",
-  "version": "0.6.5",
+  "version": "0.6.6",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "garph",
-      "version": "0.6.5",
+      "version": "0.6.6",
       "license": "MIT",
       "dependencies": {
         "graphql-compose": "^9.0.10",
diff --git a/package.json b/package.json
index 44572a4..c87aab1 100644
--- a/package.json
+++ b/package.json
@@ -5,7 +5,7 @@
     "type": "git",
     "url": "https://github.com/stepci/garph"
   },
-  "version": "0.6.5",
+  "version": "0.6.6",
   "license": "MIT",
   "main": "dist/index.js",
   "scripts": {
@@ -15,7 +15,7 @@
     "build": "tsc -p tsconfig.json",
     "postbuild": "typedoc --readme none --entryDocument index.md --plugin typedoc-plugin-markdown --tsconfig tsconfig.json --hideInPageTOC true --out www/api src/index.ts",
     "ts:check": "tsc -p tsconfig.test.json",
-    "test": "ts-node examples/relay.ts"
+    "test": "ts-node examples/promo.ts"
   },
   "devDependencies": {
     "@graphql-yoga/plugin-defer-stream": "^2.0.4",
diff --git a/src/index.ts b/src/index.ts
index ecb77ef..2a19466 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -596,7 +596,7 @@ class GArgs<T extends AnyType, X extends Args> extends Type<T, 'Args'> {
 }
 
 export class GarphSchema {
-  types: AnyType[] = []
+  types: Map<string, AnyType> = new Map()
 
   nodeType = this.interface('Node', {
     id: this.id()
@@ -618,12 +618,8 @@ export class GarphSchema {
 
   registerType(type: AnyType) {
     const name = type.typeDef.name
-    if (name) {
-      if (this.types.find(t => t.typeDef.name === name)) {
-        throw new Error(`Detected multiple types with name: ${name}`)
-      }
-    }
-    this.types.push(type)
+    if (this.types.has(name)) throw new Error(`Type with name "${name}" already exists`)
+    this.types.set(name, type)
   }
 
   constructor ({ types }: { types: AnyType[] } = { types: [] }) {
diff --git a/www/api/classes/GarphSchema.md b/www/api/classes/GarphSchema.md
index 52987b6..0b63f99 100644
--- a/www/api/classes/GarphSchema.md
+++ b/www/api/classes/GarphSchema.md
@@ -17,7 +17,7 @@
 
 #### Defined in
 
-[index.ts:629](https://github.com/stepci/garph/blob/45f35d4/src/index.ts#L629)
+[index.ts:625](https://github.com/stepci/garph/blob/11bfe12/src/index.ts#L625)
 
 ## Properties
 
@@ -27,7 +27,7 @@
 
 #### Defined in
 
-[index.ts:601](https://github.com/stepci/garph/blob/45f35d4/src/index.ts#L601)
+[index.ts:601](https://github.com/stepci/garph/blob/11bfe12/src/index.ts#L601)
 
 ___
 
@@ -46,7 +46,7 @@ ___
 
 #### Defined in
 
-[index.ts:612](https://github.com/stepci/garph/blob/45f35d4/src/index.ts#L612)
+[index.ts:612](https://github.com/stepci/garph/blob/11bfe12/src/index.ts#L612)
 
 ___
 
@@ -56,17 +56,17 @@ ___
 
 #### Defined in
 
-[index.ts:605](https://github.com/stepci/garph/blob/45f35d4/src/index.ts#L605)
+[index.ts:605](https://github.com/stepci/garph/blob/11bfe12/src/index.ts#L605)
 
 ___
 
 ### types
 
-• **types**: [`AnyType`](../index.md#anytype)[] = `[]`
+• **types**: `Map`<`string`, [`AnyType`](../index.md#anytype)\>
 
 #### Defined in
 
-[index.ts:599](https://github.com/stepci/garph/blob/45f35d4/src/index.ts#L599)
+[index.ts:599](https://github.com/stepci/garph/blob/11bfe12/src/index.ts#L599)
 
 ## Methods
 
@@ -80,7 +80,7 @@ ___
 
 #### Defined in
 
-[index.ts:714](https://github.com/stepci/garph/blob/45f35d4/src/index.ts#L714)
+[index.ts:710](https://github.com/stepci/garph/blob/11bfe12/src/index.ts#L710)
 
 ___
 
@@ -108,7 +108,7 @@ ___
 
 #### Defined in
 
-[index.ts:645](https://github.com/stepci/garph/blob/45f35d4/src/index.ts#L645)
+[index.ts:641](https://github.com/stepci/garph/blob/11bfe12/src/index.ts#L641)
 
 ___
 
@@ -136,7 +136,7 @@ ___
 
 #### Defined in
 
-[index.ts:655](https://github.com/stepci/garph/blob/45f35d4/src/index.ts#L655)
+[index.ts:651](https://github.com/stepci/garph/blob/11bfe12/src/index.ts#L651)
 
 ___
 
@@ -164,7 +164,7 @@ ___
 
 #### Defined in
 
-[index.ts:674](https://github.com/stepci/garph/blob/45f35d4/src/index.ts#L674)
+[index.ts:670](https://github.com/stepci/garph/blob/11bfe12/src/index.ts#L670)
 
 ___
 
@@ -178,7 +178,7 @@ ___
 
 #### Defined in
 
-[index.ts:710](https://github.com/stepci/garph/blob/45f35d4/src/index.ts#L710)
+[index.ts:706](https://github.com/stepci/garph/blob/11bfe12/src/index.ts#L706)
 
 ___
 
@@ -192,7 +192,7 @@ ___
 
 #### Defined in
 
-[index.ts:702](https://github.com/stepci/garph/blob/45f35d4/src/index.ts#L702)
+[index.ts:698](https://github.com/stepci/garph/blob/11bfe12/src/index.ts#L698)
 
 ___
 
@@ -220,7 +220,7 @@ ___
 
 #### Defined in
 
-[index.ts:668](https://github.com/stepci/garph/blob/45f35d4/src/index.ts#L668)
+[index.ts:664](https://github.com/stepci/garph/blob/11bfe12/src/index.ts#L664)
 
 ___
 
@@ -234,7 +234,7 @@ ___
 
 #### Defined in
 
-[index.ts:706](https://github.com/stepci/garph/blob/45f35d4/src/index.ts#L706)
+[index.ts:702](https://github.com/stepci/garph/blob/11bfe12/src/index.ts#L702)
 
 ___
 
@@ -262,7 +262,7 @@ ___
 
 #### Defined in
 
-[index.ts:692](https://github.com/stepci/garph/blob/45f35d4/src/index.ts#L692)
+[index.ts:688](https://github.com/stepci/garph/blob/11bfe12/src/index.ts#L688)
 
 ___
 
@@ -290,7 +290,7 @@ ___
 
 #### Defined in
 
-[index.ts:639](https://github.com/stepci/garph/blob/45f35d4/src/index.ts#L639)
+[index.ts:635](https://github.com/stepci/garph/blob/11bfe12/src/index.ts#L635)
 
 ___
 
@@ -316,7 +316,7 @@ ___
 
 #### Defined in
 
-[index.ts:720](https://github.com/stepci/garph/blob/45f35d4/src/index.ts#L720)
+[index.ts:716](https://github.com/stepci/garph/blob/11bfe12/src/index.ts#L716)
 
 ___
 
@@ -336,7 +336,7 @@ ___
 
 #### Defined in
 
-[index.ts:619](https://github.com/stepci/garph/blob/45f35d4/src/index.ts#L619)
+[index.ts:619](https://github.com/stepci/garph/blob/11bfe12/src/index.ts#L619)
 
 ___
 
@@ -364,7 +364,7 @@ ___
 
 #### Defined in
 
-[index.ts:686](https://github.com/stepci/garph/blob/45f35d4/src/index.ts#L686)
+[index.ts:682](https://github.com/stepci/garph/blob/11bfe12/src/index.ts#L682)
 
 ___
 
@@ -378,7 +378,7 @@ ___
 
 #### Defined in
 
-[index.ts:698](https://github.com/stepci/garph/blob/45f35d4/src/index.ts#L698)
+[index.ts:694](https://github.com/stepci/garph/blob/11bfe12/src/index.ts#L694)
 
 ___
 
@@ -406,7 +406,7 @@ ___
 
 #### Defined in
 
-[index.ts:633](https://github.com/stepci/garph/blob/45f35d4/src/index.ts#L633)
+[index.ts:629](https://github.com/stepci/garph/blob/11bfe12/src/index.ts#L629)
 
 ___
 
@@ -434,4 +434,4 @@ ___
 
 #### Defined in
 
-[index.ts:680](https://github.com/stepci/garph/blob/45f35d4/src/index.ts#L680)
+[index.ts:676](https://github.com/stepci/garph/blob/11bfe12/src/index.ts#L676)
diff --git a/www/api/classes/Type.md b/www/api/classes/Type.md
index 4ec5454..d20a4ea 100644
--- a/www/api/classes/Type.md
+++ b/www/api/classes/Type.md
@@ -30,7 +30,7 @@
 
 #### Defined in
 
-[index.ts:13](https://github.com/stepci/garph/blob/45f35d4/src/index.ts#L13)
+[index.ts:13](https://github.com/stepci/garph/blob/11bfe12/src/index.ts#L13)
 
 ___
 
@@ -40,7 +40,7 @@ ___
 
 #### Defined in
 
-[index.ts:11](https://github.com/stepci/garph/blob/45f35d4/src/index.ts#L11)
+[index.ts:11](https://github.com/stepci/garph/blob/11bfe12/src/index.ts#L11)
 
 ___
 
@@ -50,7 +50,7 @@ ___
 
 #### Defined in
 
-[index.ts:10](https://github.com/stepci/garph/blob/45f35d4/src/index.ts#L10)
+[index.ts:10](https://github.com/stepci/garph/blob/11bfe12/src/index.ts#L10)
 
 ___
 
@@ -60,7 +60,7 @@ ___
 
 #### Defined in
 
-[index.ts:9](https://github.com/stepci/garph/blob/45f35d4/src/index.ts#L9)
+[index.ts:9](https://github.com/stepci/garph/blob/11bfe12/src/index.ts#L9)
 
 ___
 
@@ -70,7 +70,7 @@ ___
 
 #### Defined in
 
-[index.ts:12](https://github.com/stepci/garph/blob/45f35d4/src/index.ts#L12)
+[index.ts:12](https://github.com/stepci/garph/blob/11bfe12/src/index.ts#L12)
 
 ___
 
@@ -80,7 +80,7 @@ ___
 
 #### Defined in
 
-[index.ts:14](https://github.com/stepci/garph/blob/45f35d4/src/index.ts#L14)
+[index.ts:14](https://github.com/stepci/garph/blob/11bfe12/src/index.ts#L14)
 
 ___
 
@@ -90,7 +90,7 @@ ___
 
 #### Defined in
 
-[index.ts:15](https://github.com/stepci/garph/blob/45f35d4/src/index.ts#L15)
+[index.ts:15](https://github.com/stepci/garph/blob/11bfe12/src/index.ts#L15)
 
 ## Methods
 
@@ -110,7 +110,7 @@ ___
 
 #### Defined in
 
-[index.ts:22](https://github.com/stepci/garph/blob/45f35d4/src/index.ts#L22)
+[index.ts:22](https://github.com/stepci/garph/blob/11bfe12/src/index.ts#L22)
 
 ___
 
@@ -130,4 +130,4 @@ ___
 
 #### Defined in
 
-[index.ts:17](https://github.com/stepci/garph/blob/45f35d4/src/index.ts#L17)
+[index.ts:17](https://github.com/stepci/garph/blob/11bfe12/src/index.ts#L17)
diff --git a/www/api/index.md b/www/api/index.md
index 1e0625e..cd57550 100644
--- a/www/api/index.md
+++ b/www/api/index.md
@@ -15,7 +15,7 @@ garph
 
 #### Defined in
 
-[index.ts:58](https://github.com/stepci/garph/blob/45f35d4/src/index.ts#L58)
+[index.ts:58](https://github.com/stepci/garph/blob/11bfe12/src/index.ts#L58)
 
 ___
 
@@ -25,7 +25,7 @@ ___
 
 #### Defined in
 
-[index.ts:46](https://github.com/stepci/garph/blob/45f35d4/src/index.ts#L46)
+[index.ts:46](https://github.com/stepci/garph/blob/11bfe12/src/index.ts#L46)
 
 ___
 
@@ -35,7 +35,7 @@ ___
 
 #### Defined in
 
-[index.ts:54](https://github.com/stepci/garph/blob/45f35d4/src/index.ts#L54)
+[index.ts:54](https://github.com/stepci/garph/blob/11bfe12/src/index.ts#L54)
 
 ___
 
@@ -45,7 +45,7 @@ ___
 
 #### Defined in
 
-[index.ts:49](https://github.com/stepci/garph/blob/45f35d4/src/index.ts#L49)
+[index.ts:49](https://github.com/stepci/garph/blob/11bfe12/src/index.ts#L49)
 
 ___
 
@@ -55,7 +55,7 @@ ___
 
 #### Defined in
 
-[index.ts:45](https://github.com/stepci/garph/blob/45f35d4/src/index.ts#L45)
+[index.ts:45](https://github.com/stepci/garph/blob/11bfe12/src/index.ts#L45)
 
 ___
 
@@ -65,7 +65,7 @@ ___
 
 #### Defined in
 
-[index.ts:56](https://github.com/stepci/garph/blob/45f35d4/src/index.ts#L56)
+[index.ts:56](https://github.com/stepci/garph/blob/11bfe12/src/index.ts#L56)
 
 ___
 
@@ -75,7 +75,7 @@ ___
 
 #### Defined in
 
-[index.ts:48](https://github.com/stepci/garph/blob/45f35d4/src/index.ts#L48)
+[index.ts:48](https://github.com/stepci/garph/blob/11bfe12/src/index.ts#L48)
 
 ___
 
@@ -85,7 +85,7 @@ ___
 
 #### Defined in
 
-[index.ts:57](https://github.com/stepci/garph/blob/45f35d4/src/index.ts#L57)
+[index.ts:57](https://github.com/stepci/garph/blob/11bfe12/src/index.ts#L57)
 
 ___
 
@@ -95,7 +95,7 @@ ___
 
 #### Defined in
 
-[index.ts:51](https://github.com/stepci/garph/blob/45f35d4/src/index.ts#L51)
+[index.ts:51](https://github.com/stepci/garph/blob/11bfe12/src/index.ts#L51)
 
 ___
 
@@ -105,7 +105,7 @@ ___
 
 #### Defined in
 
-[index.ts:47](https://github.com/stepci/garph/blob/45f35d4/src/index.ts#L47)
+[index.ts:47](https://github.com/stepci/garph/blob/11bfe12/src/index.ts#L47)
 
 ___
 
@@ -115,7 +115,7 @@ ___
 
 #### Defined in
 
-[index.ts:60](https://github.com/stepci/garph/blob/45f35d4/src/index.ts#L60)
+[index.ts:60](https://github.com/stepci/garph/blob/11bfe12/src/index.ts#L60)
 
 ___
 
@@ -129,7 +129,7 @@ ___
 
 #### Defined in
 
-[index.ts:71](https://github.com/stepci/garph/blob/45f35d4/src/index.ts#L71)
+[index.ts:71](https://github.com/stepci/garph/blob/11bfe12/src/index.ts#L71)
 
 ___
 
@@ -139,7 +139,7 @@ ___
 
 #### Defined in
 
-[index.ts:61](https://github.com/stepci/garph/blob/45f35d4/src/index.ts#L61)
+[index.ts:61](https://github.com/stepci/garph/blob/11bfe12/src/index.ts#L61)
 
 ___
 
@@ -149,7 +149,7 @@ ___
 
 #### Defined in
 
-[index.ts:59](https://github.com/stepci/garph/blob/45f35d4/src/index.ts#L59)
+[index.ts:59](https://github.com/stepci/garph/blob/11bfe12/src/index.ts#L59)
 
 ___
 
@@ -159,7 +159,7 @@ ___
 
 #### Defined in
 
-[index.ts:52](https://github.com/stepci/garph/blob/45f35d4/src/index.ts#L52)
+[index.ts:52](https://github.com/stepci/garph/blob/11bfe12/src/index.ts#L52)
 
 ___
 
@@ -169,7 +169,7 @@ ___
 
 #### Defined in
 
-[index.ts:50](https://github.com/stepci/garph/blob/45f35d4/src/index.ts#L50)
+[index.ts:50](https://github.com/stepci/garph/blob/11bfe12/src/index.ts#L50)
 
 ___
 
@@ -179,7 +179,7 @@ ___
 
 #### Defined in
 
-[index.ts:55](https://github.com/stepci/garph/blob/45f35d4/src/index.ts#L55)
+[index.ts:55](https://github.com/stepci/garph/blob/11bfe12/src/index.ts#L55)
 
 ___
 
@@ -189,7 +189,7 @@ ___
 
 #### Defined in
 
-[index.ts:44](https://github.com/stepci/garph/blob/45f35d4/src/index.ts#L44)
+[index.ts:44](https://github.com/stepci/garph/blob/11bfe12/src/index.ts#L44)
 
 ___
 
@@ -199,7 +199,7 @@ ___
 
 #### Defined in
 
-[index.ts:43](https://github.com/stepci/garph/blob/45f35d4/src/index.ts#L43)
+[index.ts:43](https://github.com/stepci/garph/blob/11bfe12/src/index.ts#L43)
 
 ___
 
@@ -213,7 +213,7 @@ ___
 
 #### Defined in
 
-[index.ts:67](https://github.com/stepci/garph/blob/45f35d4/src/index.ts#L67)
+[index.ts:67](https://github.com/stepci/garph/blob/11bfe12/src/index.ts#L67)
 
 ___
 
@@ -223,7 +223,7 @@ ___
 
 #### Defined in
 
-[index.ts:53](https://github.com/stepci/garph/blob/45f35d4/src/index.ts#L53)
+[index.ts:53](https://github.com/stepci/garph/blob/11bfe12/src/index.ts#L53)
 
 ___
 
@@ -237,7 +237,7 @@ ___
 
 #### Defined in
 
-[index.ts:63](https://github.com/stepci/garph/blob/45f35d4/src/index.ts#L63)
+[index.ts:63](https://github.com/stepci/garph/blob/11bfe12/src/index.ts#L63)
 
 ___
 
@@ -254,7 +254,7 @@ ___
 
 #### Defined in
 
-[index.ts:93](https://github.com/stepci/garph/blob/45f35d4/src/index.ts#L93)
+[index.ts:93](https://github.com/stepci/garph/blob/11bfe12/src/index.ts#L93)
 
 ___
 
@@ -270,7 +270,7 @@ ___
 
 #### Defined in
 
-[index.ts:125](https://github.com/stepci/garph/blob/45f35d4/src/index.ts#L125)
+[index.ts:125](https://github.com/stepci/garph/blob/11bfe12/src/index.ts#L125)
 
 ___
 
@@ -286,7 +286,7 @@ ___
 
 #### Defined in
 
-[index.ts:126](https://github.com/stepci/garph/blob/45f35d4/src/index.ts#L126)
+[index.ts:126](https://github.com/stepci/garph/blob/11bfe12/src/index.ts#L126)
 
 ___
 
@@ -302,7 +302,7 @@ ___
 
 #### Defined in
 
-[index.ts:120](https://github.com/stepci/garph/blob/45f35d4/src/index.ts#L120)
+[index.ts:120](https://github.com/stepci/garph/blob/11bfe12/src/index.ts#L120)
 
 ___
 
@@ -318,7 +318,7 @@ ___
 
 #### Defined in
 
-[index.ts:121](https://github.com/stepci/garph/blob/45f35d4/src/index.ts#L121)
+[index.ts:121](https://github.com/stepci/garph/blob/11bfe12/src/index.ts#L121)
 
 ___
 
@@ -335,7 +335,7 @@ ___
 
 #### Defined in
 
-[index.ts:94](https://github.com/stepci/garph/blob/45f35d4/src/index.ts#L94)
+[index.ts:94](https://github.com/stepci/garph/blob/11bfe12/src/index.ts#L94)
 
 ___
 
@@ -352,7 +352,7 @@ ___
 
 #### Defined in
 
-[index.ts:134](https://github.com/stepci/garph/blob/45f35d4/src/index.ts#L134)
+[index.ts:134](https://github.com/stepci/garph/blob/11bfe12/src/index.ts#L134)
 
 ___
 
@@ -369,7 +369,7 @@ ___
 
 #### Defined in
 
-[index.ts:156](https://github.com/stepci/garph/blob/45f35d4/src/index.ts#L156)
+[index.ts:156](https://github.com/stepci/garph/blob/11bfe12/src/index.ts#L156)
 
 ___
 
@@ -386,7 +386,7 @@ ___
 
 #### Defined in
 
-[index.ts:108](https://github.com/stepci/garph/blob/45f35d4/src/index.ts#L108)
+[index.ts:108](https://github.com/stepci/garph/blob/11bfe12/src/index.ts#L108)
 
 ___
 
@@ -402,7 +402,7 @@ ___
 
 #### Defined in
 
-[index.ts:132](https://github.com/stepci/garph/blob/45f35d4/src/index.ts#L132)
+[index.ts:132](https://github.com/stepci/garph/blob/11bfe12/src/index.ts#L132)
 
 ___
 
@@ -435,7 +435,7 @@ ___
 
 #### Defined in
 
-[index.ts:28](https://github.com/stepci/garph/blob/45f35d4/src/index.ts#L28)
+[index.ts:28](https://github.com/stepci/garph/blob/11bfe12/src/index.ts#L28)
 
 ## Variables
 
@@ -445,7 +445,7 @@ ___
 
 #### Defined in
 
-[index.ts:733](https://github.com/stepci/garph/blob/45f35d4/src/index.ts#L733)
+[index.ts:729](https://github.com/stepci/garph/blob/11bfe12/src/index.ts#L729)
 
 ## Functions
 
@@ -468,7 +468,7 @@ ___
 
 #### Defined in
 
-[schema.ts:17](https://github.com/stepci/garph/blob/45f35d4/src/schema.ts#L17)
+[schema.ts:17](https://github.com/stepci/garph/blob/11bfe12/src/schema.ts#L17)
 
 ___
 
@@ -489,4 +489,4 @@ ___
 
 #### Defined in
 
-[schema.ts:11](https://github.com/stepci/garph/blob/45f35d4/src/schema.ts#L11)
+[schema.ts:11](https://github.com/stepci/garph/blob/11bfe12/src/schema.ts#L11)