feat: add TS type definitions

Author: jedwards1211

src/getSchemaTypes.d.ts

@@ -0,0 +1,30 @@
+export type RawField = {
+  name: string
+  type: RawType
+}
+export type RawType = {
+  name: string | null | undefined
+  kind: string
+  ofType?: RawType | null | undefined
+  fields?: Array<RawField> | null | undefined
+}
+export type Field = {
+  name: string
+  type: Type
+  parent: Type
+}
+export type Type = {
+  name: string | null | undefined
+  kind: string
+  ofType?: Type | null | undefined
+  fields?:
+    | {
+        [name: string]: Field
+      }
+    | null
+    | undefined
+  parents?: Array<Field>
+}
+export type Types = {
+  [name: string]: Type
+}

src/index.d.ts

@@ -0,0 +1,20 @@
+import { ApolloClient } from 'apollo-client'
+import type { Types } from './getSchemaTypes'
+import typesQuery, { TypeMetadata } from './typesQuery'
+export { typesQuery }
+export type { TypeMetadata }
+
+type Term = [string, any, string | null | undefined] | [string, any] | [string]
+
+declare const refetch: {
+  (
+    client: unknown,
+    typenameOrTerms: string | ReadonlyArray<Term>,
+    predicate?: any | null,
+    idField?: string
+  ): Promise<any>
+  fetchTypeMetadata(client: ApolloClient<any>): Promise<Types>
+  setTypeMetadata(metadata: Promise<TypeMetadata> | TypeMetadata): void
+}
+
+export default refetch

src/typesQuery.d.ts

@@ -0,0 +1,46 @@
+import { DocumentNode } from 'graphql'
+declare const typesQuery: DocumentNode
+export default typesQuery
+
+type __TypeKind =
+  | 'SCALAR'
+  | 'OBJECT'
+  | 'INTERFACE'
+  | 'UNION'
+  | 'ENUM'
+  | 'INPUT_OBJECT'
+  | 'LIST'
+  | 'NON_NULL'
+
+export type TypeMetadata = {
+  data: {
+    __schema: {
+      types: Array<{
+        name: string | null | undefined
+        fields: Array<{
+          name: string
+          type:
+            | {
+                name: string | null | undefined
+                kind: __TypeKind
+                ofType:
+                  | {
+                      name: string | null | undefined
+                      kind: __TypeKind
+                      ofType:
+                        | {
+                            name: string | null | undefined
+                          }
+                        | null
+                        | undefined
+                    }
+                  | null
+                  | undefined
+              }
+            | null
+            | undefined
+        }>
+      }>
+    }
+  }
+}