bf-graphql-typed-client/src/render/client/renderClient.ts

A tool that generates a strongly typed client library for any GraphQL endpoint. The client allows writing GraphQL queries as plain JS objects (with type safety, awesome code completion experience, custom scalar type mapping, type guards and more)

import { GraphQLSchema } from 'graphql'
import { relativeImportPath } from '../common/relativeImportPath'
import { RenderContext } from '../common/RenderContext'

const packageJson = require('../../../package.json')

export const renderClient = (schema: GraphQLSchema, ctx: RenderContext) => {
  const options = []

  const queryType = schema.getQueryType()
  const mutationType = schema.getMutationType()
  const subscriptionType = schema.getSubscriptionType()

  if (queryType) options.push(`queryRoot: typeMap.${queryType.name}`)
  if (mutationType) options.push(`mutationRoot: typeMap.${mutationType.name}`)
  if (subscriptionType) options.push(`subscriptionRoot: typeMap.${subscriptionType.name}`)

  const typeMapperImport =
    ctx.config &&
    ctx.config.output &&
    ctx.config.options &&
    ctx.config.options.typeMapper &&
    relativeImportPath(ctx.config.output, ctx.config.options.typeMapper.location)

  if (typeMapperImport) options.push('typeMapper')

  ctx.addCodeBlock(`
    "use strict";
    var __assign =
      (this && this.__assign) ||
      function() {
        __assign =
          Object.assign ||
          function(t) {
            for (var s, i = 1, n = arguments.length; i < n; i++) {
              s = arguments[i];
              for (var p in s)
                if (Object.prototype.hasOwnProperty.call(s, p)) t[p] = s[p];
            }
            return t;
          };
        return __assign.apply(this, arguments);
      };
    Object.defineProperty(exports, "__esModule", { value: true });
    
		import * as __1 from "${packageJson.name}";
		import typeMapJSON from "./typeMap.json";

    ${typeMapperImport ? `import { typeMapper } from "${typeMapperImport}";` : ''}
    exports.createClient = function(options) {
      var typeMap = __1.linkTypeMap(typeMapJSON);
      return __1.createClient(
        __assign({}, options, {
          ${options.join(',')}
        })
      );
    };
  `)
}