typescript errors with version 1.0.1

Hello,

When I update from version 0.7.1 to 1.0.1, I have the following typesciprt errors:

```
node_modules/apollo-link-http-common/lib/index.d.ts:4:15 - error TS2304: Cannot find name 'Response'.

4 response: Response;
~~~~~~~~

node_modules/apollo-link-http-common/lib/index.d.ts:9:15 - error TS2304: Cannot find name 'Response'.

9 response: Response;
~~~~~~~~

node_modules/apollo-link-http-common/lib/index.d.ts:38:13 - error TS2304: Cannot find name 'WindowOrWorkerGlobalScope'.

38 fetch?: WindowOrWorkerGlobalScope['fetch'];
~~~~~~~~~~~~~~~~~~~~~~~~~

node_modules/apollo-link-http-common/lib/index.d.ts:54:81 - error TS2304: Cannot find name 'Response'.

54 export declare const parseAndCheckHttpResponse: (operations: any) => (response: Response) => Promise;
~~~~~~~~

node_modules/apollo-link-http-common/lib/index.d.ts:55:54 - error TS2304: Cannot find name 'RequestInfo'.

55 export declare const checkFetcher: (fetcher: (input: RequestInfo, init?: RequestInit) => Promise) => void;
~~~~~~~~~~~

node_modules/apollo-link-http-common/lib/index.d.ts:55:74 - error TS2304: Cannot find name 'RequestInit'.

55 export declare const checkFetcher: (fetcher: (input: RequestInfo, init?: RequestInit) => Promise) => void;
~~~~~~~~~~~

node_modules/apollo-link-http-common/lib/index.d.ts:55:98 - error TS2304: Cannot find name 'Response'.

55 export declare const checkFetcher: (fetcher: (input: RequestInfo, init?: RequestInit) => Promise) => void;
~~~~~~~~

node_modules/graphql-tools-fork/dist/links/createServerHttpLink.d.ts:5:8 - error TS1259: Module '"/node_modules/form-data/index"' can only be default-imported using the 'esModuleInterop' flag

5 import KnownLengthFormData, { AppendOptions } from 'form-data';
~~~~~~~~~~~~~~~~~~~

node_modules/form-data/index.d.ts:10:1
10 export = FormData;
~~~~~~~~~~~~~~~~~~
This module is declared with using 'export =', and can only be used with a default import when using the 'esModuleInterop' flag.

Found 8 errors.
```

Here is how I use `importSchema`:

```js
import { buildSchema } from 'graphql'
import { importSchema } from 'graphql-import'

const index = importSchema(schemas/index.graphql')

const schema = buildSchema(index)

export default schema
```

How can I fix these errors?

Than you

Start by reproducing the TypeScript compilation errors from the reported importSchema usage. Inspect the declarations in node_modules/apollo-link-http-common/lib/index.d.ts, node_modules/graphql-tools-fork/dist/links/createServerHttpLink.d.ts, and node_modules/form-data/index.d.ts to identify the dependency or compiler-configuration mismatch. Done means the reported eight errors no longer occur with graphql-import 1.0.1.

Written by the indexing model from the issue text.