diff --git a/.github/workflows/pull-request.yml b/.github/workflows/pull-request.yml
index b8be5c30..86355ad8 100644
--- a/.github/workflows/pull-request.yml
+++ b/.github/workflows/pull-request.yml
@@ -20,6 +20,7 @@ jobs:
         run: yarn -s test:ci
       - name: Upload coverage to Codecov
         uses: codecov/codecov-action@v1
+        if: matrix.os == 'ubuntu-latest' && matrix.node-version == '10.x'
         with:
           directory: ./coverage
 
diff --git a/.github/workflows/trunk.yml b/.github/workflows/trunk.yml
index 7753a1c4..f3a5bae2 100644
--- a/.github/workflows/trunk.yml
+++ b/.github/workflows/trunk.yml
@@ -21,6 +21,7 @@ jobs:
       - name: Test
         run: yarn -s test:ci
       - name: Upload coverage to Codecov
+        if: matrix.os == 'ubuntu-latest' && matrix.node-version == '10.x'
         uses: codecov/codecov-action@v1
         with:
           directory: ./coverage
diff --git a/codecov.yml b/codecov.yml
index 55a95925..9afc2967 100644
--- a/codecov.yml
+++ b/codecov.yml
@@ -1,5 +1,10 @@
+codecov:
+  require_ci_to_pass: no
+  notify:
+    wait_for_ci: no
+
 comment:
-  layout: "diff"
+  layout: 'diff'
 
 coverage:
   status:
diff --git a/docs/content/015-api/110-plugins.mdx b/docs/content/015-api/110-plugins.mdx
index 076a2d34..8c6c2f4c 100644
--- a/docs/content/015-api/110-plugins.mdx
+++ b/docs/content/015-api/110-plugins.mdx
@@ -78,6 +78,49 @@ plugin({
 })
 ```
 
+### onObjectDefinition(t, objectConfig)
+
+The "onObjectDefinition" hook is called when an `objectType` is created, and is provided `t`, the object
+passed into the `definition` block, as well as the `config` of the object.
+
+```ts
+export const NodePlugin = plugin({
+  name: 'NodePlugin',
+  description: 'Allows us to designate the field used to determine the "node" interface',
+  objectTypeDefTypes: `node?: string | core.FieldResolver<TypeName, any>`,
+  onObjectDefinition(t, { node }) {
+    if (node) {
+      let resolveFn
+      if (typeof node === 'string') {
+        const fieldResolve: FieldResolver<any, any> = (root, args, ctx, info) => {
+          return `${info.parentType.name}:${root[node]}`
+        }
+        resolveFn = fieldResolve
+      } else {
+        resolveFn = node
+      }
+      t.implements('Node')
+      t.id('id', {
+        nullable: false,
+        resolve: resolveFn,
+      })
+    }
+  },
+})
+```
+
+Usage:
+
+```ts
+const User = objectType({
+  name: 'User',
+  node: 'id', // adds `id` field
+  definition(t) {
+    t.string('name')
+  },
+})
+```
+
 ### onCreateFieldResolver(config)
 
 Every ObjectType, whether they are defined via Nexus' `objectType` api, or elsewhere is given a resolver.
diff --git a/examples/kitchen-sink/src/example-plugins.ts b/examples/kitchen-sink/src/example-plugins.ts
index 5321bea1..cc9b7a77 100644
--- a/examples/kitchen-sink/src/example-plugins.ts
+++ b/examples/kitchen-sink/src/example-plugins.ts
@@ -1,4 +1,4 @@
-import { plugin } from '@nexus/schema'
+import { plugin, interfaceType, FieldResolver } from '@nexus/schema'
 
 export const logMutationTimePlugin = plugin({
   name: 'LogMutationTime',
@@ -15,3 +15,50 @@ export const logMutationTimePlugin = plugin({
     }
   },
 })
+
+export const NodePlugin = plugin({
+  name: 'NodePlugin',
+  description: 'Allows us to designate the field used to ',
+  objectTypeDefTypes: `node?: string | core.FieldResolver<TypeName, any>`,
+  onObjectDefinition(t, { node }) {
+    if (node) {
+      let resolveFn
+      if (typeof node === 'string') {
+        const fieldResolve: FieldResolver<any, any> = (root, args, ctx, info) => {
+          return `${info.parentType.name}:${root[node]}`
+        }
+        resolveFn = fieldResolve
+      } else {
+        resolveFn = node
+      }
+      t.implements('Node')
+      t.id('id', {
+        nullable: false,
+        resolve: resolveFn,
+      })
+    }
+  },
+  onMissingType(t, builder) {
+    if (t === 'Node') {
+      return interfaceType({
+        name: 'Node',
+        description:
+          'A "Node" is a field with a required ID field (id), per the https://relay.dev/docs/en/graphql-server-specification',
+        definition(t) {
+          t.id('id', {
+            nullable: false,
+            resolve: () => {
+              throw new Error('Abstract')
+            },
+          })
+          t.resolveType((t) => {
+            if (t.__typename) {
+              return t.__typename
+            }
+            throw new Error('__typename missing for resolving Node')
+          })
+        },
+      })
+    }
+  },
+})
diff --git a/examples/kitchen-sink/src/index.ts b/examples/kitchen-sink/src/index.ts
index 0c58d6c6..5840951b 100644
--- a/examples/kitchen-sink/src/index.ts
+++ b/examples/kitchen-sink/src/index.ts
@@ -10,7 +10,7 @@ import { ApolloServer } from 'apollo-server'
 import { separateOperations } from 'graphql'
 import { fieldExtensionsEstimator, getComplexity, simpleEstimator } from 'graphql-query-complexity'
 import path from 'path'
-import { logMutationTimePlugin } from './example-plugins'
+import { logMutationTimePlugin, NodePlugin } from './example-plugins'
 import * as types from './kitchen-sink-definitions'
 
 const DEBUGGING_CURSOR = false
@@ -24,6 +24,7 @@ const schema = makeSchema({
     typegen: path.join(__dirname, './kitchen-sink.gen.ts'),
   },
   plugins: [
+    NodePlugin,
     connectionPlugin({
       encodeCursor: fn,
       decodeCursor: fn,
diff --git a/examples/kitchen-sink/src/kitchen-sink-definitions.ts b/examples/kitchen-sink/src/kitchen-sink-definitions.ts
index 1f114bfa..f4c10f6e 100644
--- a/examples/kitchen-sink/src/kitchen-sink-definitions.ts
+++ b/examples/kitchen-sink/src/kitchen-sink-definitions.ts
@@ -31,18 +31,6 @@ export const testArgs2 = {
   bar: idArg(),
 }
 
-export const Node = interfaceType({
-  name: 'Node',
-  definition(t) {
-    t.id('id', {
-      nullable: false,
-      resolve: () => {
-        throw new Error('Abstract')
-      },
-    })
-  },
-})
-
 export const Mutation = mutationType({
   definition(t) {
     t.boolean('ok', () => true)
@@ -118,6 +106,7 @@ export const TestUnion = unionType({
 
 export const TestObj = objectType({
   name: 'TestObj',
+  node: (obj) => `TestObj:${obj.item}`,
   definition(t) {
     t.implements('Bar', Baz)
     t.string('item')
diff --git a/examples/ts-ast-reader/ts-ast-reader-schema.graphql b/examples/ts-ast-reader/ts-ast-reader-schema.graphql
index ec6a2c50..34592f35 100644
--- a/examples/ts-ast-reader/ts-ast-reader-schema.graphql
+++ b/examples/ts-ast-reader/ts-ast-reader-schema.graphql
@@ -613,6 +613,7 @@ enum NodeFlags {
   Namespace
   NestedNamespace
   None
+  OptionalChain
   PermanentlySetIncrementalFlags
   PossiblyContainsDynamicImport
   PossiblyContainsImportMeta
@@ -621,6 +622,7 @@ enum NodeFlags {
   Synthesized
   ThisNodeHasError
   ThisNodeOrAnySubNodesHasError
+  TypeCached
   TypeExcludesFlags
   UNKNOWN
   YieldContext
@@ -842,6 +844,7 @@ enum SyntaxKind {
   ArrowFunction
   AsExpression
   AsKeyword
+  AssertsKeyword
   AsteriskAsteriskEqualsToken
   AsteriskAsteriskToken
   AsteriskEqualsToken
@@ -942,6 +945,7 @@ enum SyntaxKind {
   FirstNode
   FirstPunctuation
   FirstReservedWord
+  FirstStatement
   FirstTemplateToken
   FirstToken
   FirstTriviaToken
@@ -994,12 +998,17 @@ enum SyntaxKind {
   JSDocComment
   JSDocEnumTag
   JSDocFunctionType
+  JSDocImplementsTag
   JSDocNamepathType
   JSDocNonNullableType
   JSDocNullableType
   JSDocOptionalType
   JSDocParameterTag
+  JSDocPrivateTag
   JSDocPropertyTag
+  JSDocProtectedTag
+  JSDocPublicTag
+  JSDocReadonlyTag
   JSDocReturnTag
   JSDocSignature
   JSDocTag
@@ -1037,6 +1046,7 @@ enum SyntaxKind {
   LastLiteralToken
   LastPunctuation
   LastReservedWord
+  LastStatement
   LastTemplateToken
   LastToken
   LastTriviaToken
@@ -1063,6 +1073,7 @@ enum SyntaxKind {
   MultiLineCommentTrivia
   NamedExports
   NamedImports
+  NamespaceExport
   NamespaceExportDeclaration
   NamespaceImport
   NamespaceKeyword
@@ -1097,6 +1108,7 @@ enum SyntaxKind {
   PlusToken
   PostfixUnaryExpression
   PrefixUnaryExpression
+  PrivateIdentifier
   PrivateKeyword
   PropertyAccessExpression
   PropertyAssignment
@@ -1105,6 +1117,8 @@ enum SyntaxKind {
   ProtectedKeyword
   PublicKeyword
   QualifiedName
+  QuestionDotToken
+  QuestionQuestionToken
   QuestionToken
   ReadonlyKeyword
   RegularExpressionLiteral
@@ -1133,6 +1147,7 @@ enum SyntaxKind {
   SymbolKeyword
   SyntaxList
   SyntheticExpression
+  SyntheticReferenceExpression
   TaggedTemplateExpression
   TemplateExpression
   TemplateHead
diff --git a/src/builder.ts b/src/builder.ts
index 30eac51d..8831165e 100644
--- a/src/builder.ts
+++ b/src/builder.ts
@@ -403,6 +403,16 @@ export class SchemaBuilder {
    */
   protected onAfterBuildFns: Exclude<PluginConfig['onAfterBuild'], undefined>[] = []
 
+  /**
+   * Executed after the object is defined, allowing us to add additional fields to the object
+   */
+  protected onObjectDefinitionFns: Exclude<PluginConfig['onObjectDefinition'], undefined>[] = []
+
+  /**
+   * Executed after the object is defined, allowing us to add additional fields to the object
+   */
+  protected onInputObjectDefinitionFns: Exclude<PluginConfig['onInputObjectDefinition'], undefined>[] = []
+
   /**
    * The `schemaExtension` is created just after the types are walked,
    * but before the fields are materialized.
@@ -673,6 +683,12 @@ export class SchemaBuilder {
       if (pluginConfig.onAfterBuild) {
         this.onAfterBuildFns.push(pluginConfig.onAfterBuild)
       }
+      if (pluginConfig.onObjectDefinition) {
+        this.onObjectDefinitionFns.push(pluginConfig.onObjectDefinition)
+      }
+      if (pluginConfig.onInputObjectDefinition) {
+        this.onInputObjectDefinitionFns.push(pluginConfig.onInputObjectDefinition)
+      }
     })
   }
 
@@ -761,6 +777,9 @@ export class SchemaBuilder {
       warn: consoleWarn,
     })
     config.definition(definitionBlock)
+    this.onInputObjectDefinitionFns.forEach((fn) => {
+      fn(definitionBlock, config)
+    })
     const extensions = this.inputTypeExtendMap[config.name]
     if (extensions) {
       extensions.forEach((extension) => {
@@ -790,6 +809,9 @@ export class SchemaBuilder {
       warn: consoleWarn,
     })
     config.definition(definitionBlock)
+    this.onObjectDefinitionFns.forEach((fn) => {
+      fn(definitionBlock, config)
+    })
     const extensions = this.typeExtendMap[config.name]
     if (extensions) {
       extensions.forEach((extension) => {
diff --git a/src/plugin.ts b/src/plugin.ts
index aecd9e28..08571efb 100644
--- a/src/plugin.ts
+++ b/src/plugin.ts
@@ -11,6 +11,9 @@ import {
 } from './definitions/_types'
 import { NexusSchemaExtension } from './extensions'
 import { isPromiseLike, PrintedGenTyping, PrintedGenTypingImport, venn } from './utils'
+import { NexusObjectTypeConfig, ObjectDefinitionBlock } from './definitions/objectType'
+import { InputDefinitionBlock } from './definitions/definitionBlocks'
+import { NexusInputObjectTypeConfig } from './definitions/inputObjectType'
 
 export { PluginBuilderLens }
 
@@ -89,6 +92,19 @@ export interface PluginConfig {
    * After the schema is built, provided the Schema to do any final config validation.
    */
   onAfterBuild?: (schema: GraphQLSchema) => void
+  /**
+   * Called immediately after the object is defined, allows for using metadata
+   * to define the shape of the object.
+   */
+  onObjectDefinition?: (block: ObjectDefinitionBlock<any>, objectConfig: NexusObjectTypeConfig<any>) => void
+  /**
+   * Called immediately after the input object is defined, allows for using metadata
+   * to define the shape of the input object
+   */
+  onInputObjectDefinition?: (
+    block: InputDefinitionBlock<any>,
+    objectConfig: NexusInputObjectTypeConfig<any>
+  ) => void
   /**
    * If a type is not defined in the schema, our plugins can register an `onMissingType` handler,
    * which will intercept the missing type name and give us an opportunity to respond with a valid
@@ -206,6 +222,8 @@ function validatePluginConfig(pluginConfig: PluginConfig): void {
     'onBeforeBuild',
     'onMissingType',
     'onAfterBuild',
+    'onObjectDefinition',
+    'onInputObjectDefinition',
   ]
   const validOptionalProps = ['description', 'fieldDefTypes', 'objectTypeDefTypes', ...optionalPropFns]
 
diff --git a/tests/plugin.spec.ts b/tests/plugin.spec.ts
index 76a5b002..3fedc747 100644
--- a/tests/plugin.spec.ts
+++ b/tests/plugin.spec.ts
@@ -1,5 +1,5 @@
-import { buildSchema, graphql, GraphQLSchema, printSchema } from 'graphql'
-import { makeSchema, MiddlewareFn, objectType, plugin, queryField } from '../src/core'
+import { buildSchema, graphql, GraphQLSchema, printSchema, introspectionFromSchema } from 'graphql'
+import { makeSchema, MiddlewareFn, objectType, plugin, queryField, interfaceType } from '../src/core'
 import { nullabilityGuardPlugin } from '../src/plugins'
 import { EXAMPLE_SDL } from './_sdl'
 
@@ -203,6 +203,70 @@ describe('plugin', () => {
     )
     expect(calls).toMatchSnapshot()
   })
+
+  it('has an onObjectDefinition option, which receives the object metadata', async () => {
+    //
+    const schema = makeSchema({
+      outputs: false,
+      types: [
+        interfaceType({
+          name: 'Node',
+          definition(t) {
+            t.id('id', {
+              nullable: false,
+              resolve: () => {
+                throw new Error('Abstract')
+              },
+            })
+            t.resolveType((n) => n.__typename)
+          },
+        }),
+        objectType({
+          name: 'AddsNode',
+          // @ts-ignore
+          node: 'id',
+          definition(t) {
+            t.string('name')
+          },
+        }),
+        queryField('getNode', {
+          type: 'Node',
+          resolve: () => ({ __typename: 'AddsNode', name: 'test', id: 'abc' }),
+        }),
+      ],
+      plugins: [
+        plugin({
+          name: 'Node',
+          onObjectDefinition(t, config) {
+            const node = (config as any).node as any
+            if (node) {
+              t.implements('Node')
+              t.id('id', {
+                nullable: false,
+                resolve: (root) => `${config.name}:${root[node]}`,
+              })
+            }
+          },
+        }),
+      ],
+    })
+    const result = await graphql(
+      schema,
+      `
+        {
+          getNode {
+            __typename
+            id
+            ... on AddsNode {
+              name
+            }
+          }
+        }
+      `
+    )
+    expect(result.data?.getNode).toEqual({ __typename: 'AddsNode', id: 'AddsNode:abc', name: 'test' })
+  })
+
   it('has a plugin.completeValue fn which is used to efficiently complete a value which is possibly a promise', async () => {
     const calls: string[] = []
     const testResolve = (name: string) => (): MiddlewareFn => async (root, args, ctx, info, next) => {