SvgPanZoom namespace workaround

[mac2000]

Hopefully will also fix #91 required for graphql-faker voyager tab

While we are waiting for PR to dependency library there is an workaround

The problem is that in dependency there is outdated namespace way of declarations which indeed makes everything harder

Unfortunately we can not force other library to make es6 like modules

But there is an workaround - we just declare required interfaces and everything become working

How I did check this:

Prepared test.json with following content:

{
  "extends": "./tsconfig.lib.json",
  "include": ["./typings/**/*.ts" ]
}

# cleanup everything
rm -rf dist middleware typings node_modules
# install dependencies
yarn
# build
yarn build:release
# test
.\node_modules\.bin\tsc --noEmit -p test.json

without this change we got:

typings/graph/viewport.d.ts:6:13 - error TS2503: Cannot find namespace 'SvgPanZoom'.

6     zoomer: SvgPanZoom.Instance;
              ~~~~~~~~~~

Found 1 error.

with them - everything is ok

[IvanGoncharov]

@mac2000 Merged and released as graphql-voyager@1.0.0-rc.31 🎉