Build failure (@types/isomorphic-fetch)

[PatSmuk]

Vortigern fails to build due to outdated @types/isomorphic-fetch.

C:\Users\Pat\Source\vortigern>npm start

> vortigern@0.1.2 prestart C:\Users\Pat\Source\vortigern
> npm run build


> vortigern@0.1.2 prebuild C:\Users\Pat\Source\vortigern
> npm run clean


> vortigern@0.1.2 clean C:\Users\Pat\Source\vortigern
> rimraf build


> vortigern@0.1.2 build C:\Users\Pat\Source\vortigern
> webpack --config config/webpack/index.js


[at-loader] Using typescript@2.3.1 from typescript and "tsconfig.json" from C:\Users\Pat\Source\vortigern/tsconfig.json.


[at-loader] Checking started in a separate process...

[at-loader] Checking finished with 13 errors
Hash: de971dd61af0e317b59a
Version: webpack 2.4.1
Time: 10438ms
   [7] ./~/react-dom/lib/ReactMount.js 25.5 kB {0} [built]
   [8] (webpack)/buildin/module.js 517 bytes {0} [built]
  [10] ./~/react-hot-api/modules/index.js 57 bytes {0} [built]
  [11] ./~/react-hot-loader/RootInstanceProvider.js 1.18 kB {0} [built]
  [12] ./~/react-hot-loader/makeExportsHot.js 1.73 kB {0} [built]
 [239] ./src/client.tsx 2.46 kB {0} [built]
 [240] ./src/vendor/main.ts 1.48 kB {0} [built]
 [241] (webpack)-hot-middleware/client.js?reload=true 6.68 kB {0} [built]
 [303] ./~/es6-promise/dist/es6-promise.js 28.5 kB {0} [built]
 [383] ./~/querystring-es3/index.js 127 bytes {0} [built]
 [384] ./~/react-dom/index.js 59 bytes {0} [built]
 [474] ./src/app/redux/store.ts 2.83 kB {0} [built]
 [475] ./src/app/routes/index.tsx 1.97 kB {0} [built]
 [547] ./~/strip-ansi/index.js 161 bytes {0} [built]
 [562] multi webpack-hot-middleware/client?reload=true ./src/client.tsx ./src/vendor/main.ts 52 bytes {0} [built]
    + 548 hidden modules

ERROR in [at-loader] ./node_modules/@types/isomorphic-fetch/index.d.ts:45:5
    TS2403: Subsequent variable declarations must have the same type.  Variable 'referrerPolicy' must be of type 'ReferrerPolicy', but here has type 'string'.

ERROR in [at-loader] ./node_modules/@types/isomorphic-fetch/index.d.ts:46:5
    TS2403: Subsequent variable declarations must have the same type.  Variable 'mode' must be of type 'RequestMode', but here has type 'string'.

ERROR in [at-loader] ./node_modules/@types/isomorphic-fetch/index.d.ts:47:5
    TS2403: Subsequent variable declarations must have the same type.  Variable 'credentials' must be of type 'RequestCredentials', but here has type 'string'.

ERROR in [at-loader] ./node_modules/@types/isomorphic-fetch/index.d.ts:48:5
    TS2403: Subsequent variable declarations must have the same type.  Variable 'cache' must be of type 'RequestCache', but here has type 'string'.

ERROR in [at-loader] ./node_modules/@types/isomorphic-fetch/index.d.ts:49:5
    TS2403: Subsequent variable declarations must have the same type.  Variable 'redirect' must be of type 'RequestRedirect', but here has type 'string'.

ERROR in [at-loader] ./node_modules/@types/isomorphic-fetch/index.d.ts:56:14
    TS2403: Subsequent variable declarations must have the same type.  Variable 'cache' must be of type 'RequestCache', but here has type 'string'.

ERROR in [at-loader] ./node_modules/@types/isomorphic-fetch/index.d.ts:57:14
    TS2403: Subsequent variable declarations must have the same type.  Variable 'credentials' must be of type 'RequestCredentials', but here has type 'string'.

ERROR in [at-loader] ./node_modules/@types/isomorphic-fetch/index.d.ts:58:14
    TS2403: Subsequent variable declarations must have the same type.  Variable 'destination' must be of type 'RequestDestination', but here has type 'string'.

ERROR in [at-loader] ./node_modules/@types/isomorphic-fetch/index.d.ts:63:14
    TS2403: Subsequent variable declarations must have the same type.  Variable 'mode' must be of type 'RequestMode', but here has type 'string'.

ERROR in [at-loader] ./node_modules/@types/isomorphic-fetch/index.d.ts:64:14
    TS2403: Subsequent variable declarations must have the same type.  Variable 'redirect' must be of type 'RequestRedirect', but here has type 'string'.

ERROR in [at-loader] ./node_modules/@types/isomorphic-fetch/index.d.ts:66:14
    TS2403: Subsequent variable declarations must have the same type.  Variable 'referrerPolicy' must be of type 'ReferrerPolicy', but here has type 'string'.

ERROR in [at-loader] ./node_modules/@types/isomorphic-fetch/index.d.ts:67:14
    TS2403: Subsequent variable declarations must have the same type.  Variable 'type' must be of type 'RequestType', but here has type 'string'.

ERROR in [at-loader] ./node_modules/@types/isomorphic-fetch/index.d.ts:94:14
    TS2403: Subsequent variable declarations must have the same type.  Variable 'type' must be of type 'ResponseType', but here has type 'string'.

[empz]

I can confirm that updating @types/isomorphic-fetch fixes the issue.