graphql-query-tree

Parse info object (passed to resolver) into a query tree and extract useful info from it.

Installation

$ npm install --save graphql-query-tree

Features

• Parse info argument (passed to resolver) into GraphqlQueryTree
  • Supports Fragments and InlineFragments
• Check if field at given path is present in query
• Get arguments for field at given path
  • Supports variables
  • Supports default argument(s) values
• Get child fields (keys) of field at given path

Usage

query {
  posts (limit: 20) {
    id
    title
    author {
      id
      name
    }
    tags (limit: 10, sort: "created_at") {
      id
      text
    }
  }
}

import GraphqlQueryTree from 'graphql-query-tree';

export default function (root, args, context, info) {
  const tree = new GraphqlQueryTree(info);

  // check if field is selected
  tree.isSelected('tags'); // true
  tree.isSelected('author.profilePicture'); // false

  // get field arguments
  tree.getArguments('tags'); // { limit: 10, sort: 'created_at' }
  tree.getArguments(); // { limit: 20 }
  tree.getArguments('some.invalid.path'); // null

  // get child fields
  tree.getChildFields('tags'); // ['id', 'text']
  tree.getChildFields('some.invalid.path'); // null

  tree.getParentType(); // 'Query'
  tree.getParentField(); // 'posts'
  tree.getReturnType(); // 'Post'
  tree.getType(); // 'Post'
  tree.getType('author'); // 'User'
  tree.getType('tags'); // 'Tag'
  tree.getType('some.invalid.path'); // null
}