implement converter isntead of a parser

Author: dotansimha

example/query.graphql

@@ -1,3 +1,3 @@
-query my {
+query myQuery {
   hello
 }

example/schema.graphql

@@ -1,3 +1,3 @@
 type Query {
-  hello: String!
+  hello: String! @deprecated(test: "", reason: "!") 
 }

packages/graphql-estree/package.json

@@ -16,10 +16,12 @@
     "prepack": "bob prepack"
   },
   "dependencies": {
+    "clone-deep": "4.0.1",
     "@graphql-eslint/types": "0.0.1",
     "@graphql-tools/utils": "6.2.0"
   },
   "devDependencies": {
+    "@types/clone-deep": "4.0.1",
     "@types/eslint": "7.2.2",
     "bob-the-bundler": "1.1.0",
     "graphql": "15.3.0",

packages/graphql-estree/src/converter.ts

@@ -0,0 +1,77 @@
+import { convertDescription, GraphQLESTreeNode, SafeGraphQLType, convertLocation, convertRange } from "@graphql-eslint/types";
+import {
+  ASTNode,
+  TypeNode,
+  TypeInfo,
+  visit,
+  visitWithTypeInfo,
+} from "graphql";
+import cloneAst from "clone-deep";
+
+export function convertToESTree<T extends ASTNode>(
+  node: T,
+  typeInfo?: TypeInfo
+): GraphQLESTreeNode<T> {
+  const visitor = { leave: convertNode(typeInfo) };
+  return visit(node, typeInfo ? visitWithTypeInfo(typeInfo, visitor) : visitor);
+}
+
+function hasTypeField<T extends ASTNode>(
+  obj: any
+): obj is T & { readonly type: TypeNode } {
+  return obj && !!(obj as any).type;
+}
+
+const convertNode = (typeInfo?: TypeInfo) => <T extends ASTNode>(
+  node: T
+): GraphQLESTreeNode<T> => {
+  const rawNode = cloneAst(node);
+  const commonFields = {
+    typeInfo: typeInfo
+      ? {
+          argument: typeInfo.getArgument(),
+          defaultValue: typeInfo.getDefaultValue(),
+          directive: typeInfo.getDirective(),
+          enumValue: typeInfo.getEnumValue(),
+          fieldDef: typeInfo.getFieldDef(),
+          inputType: typeInfo.getInputType(),
+          parentInputType: typeInfo.getParentInputType(),
+          parentType: typeInfo.getParentType(),
+          gqlType: typeInfo.getType(),
+        }
+      : {},
+    leadingComments: convertDescription(node),
+    trailingComments: [],
+    loc: convertLocation(node.loc),
+    range: convertRange(node.loc),
+  };
+
+  if (hasTypeField<T>(node)) {
+    const { type: gqlType, loc: gqlLocation, ...rest } = node;
+    const typeFieldSafe: SafeGraphQLType<T> = {
+      ...rest,
+      gqlType,
+    } as SafeGraphQLType<T & { readonly type: TypeNode }>;
+    const estreeNode: GraphQLESTreeNode<T> = {
+      ...typeFieldSafe,
+      ...commonFields,
+      type: node.kind,
+      rawNode,
+      gqlLocation,
+    } as any as GraphQLESTreeNode<T>;
+
+    return estreeNode;
+  } else {
+    const { loc: gqlLocation, ...rest } = node;
+    const typeFieldSafe: SafeGraphQLType<T> = rest as SafeGraphQLType<T & { readonly type: TypeNode }>;
+    const estreeNode: GraphQLESTreeNode<T> = {
+      ...typeFieldSafe,
+      ...commonFields,
+      type: node.kind,
+      rawNode,
+      gqlLocation,
+    } as any as GraphQLESTreeNode<T>;
+
+    return estreeNode;
+  }
+};

packages/graphql-estree/src/index.ts

@@ -1 +1 @@
-export * from "./parser";
+export * from "./converter";