Errors when installing locally: Namespace '"fs"' has no exported member...
Thanks for this useful tool! 
Generating a font from svg icons works fine, also the web app builds fine with webpack.
BUT when I install it locally, I get these errors:
```
✖ ｢atl｣: Checking finished with 10 errors
[at-loader] ./node_modules/@types/fs-extra/index.d.ts:188:87 
    TS2694: Namespace '"fs"' has no exported member 'Dir'. 

[at-loader] ./node_modules/@types/fs-extra/index.d.ts:191:17 
    TS2694: Namespace '"fs"' has no exported member 'OpenDirOptions'. 

[at-loader] ./node_modules/@types/fs-extra/index.d.ts:192:53 
    TS2694: Namespace '"fs"' has no exported member 'Dir'. 

[at-loader] ./node_modules/@types/fs-extra/index.d.ts:194:52 
    TS2694: Namespace '"fs"' has no exported member 'OpenDirOptions'. 

[at-loader] ./node_modules/@types/fs-extra/index.d.ts:194:80 
    TS2694: Namespace '"fs"' has no exported member 'Dir'. 

[at-loader] ./node_modules/@types/fs-extra/index.d.ts:265:52 
    TS2694: Namespace 'NodeJS' has no exported member 'ArrayBufferView'. 

[at-loader] ./node_modules/@types/fs-extra/index.d.ts:265:167 
    TS2694: Namespace 'NodeJS' has no exported member 'ArrayBufferView'. 

[at-loader] ./node_modules/@types/fs-extra/index.d.ts:266:52 
    TS2694: Namespace 'NodeJS' has no exported member 'ArrayBufferView'. 

[at-loader] ./node_modules/@types/fs-extra/index.d.ts:266:149 
    TS2694: Namespace 'NodeJS' has no exported member 'ArrayBufferView'. 

[at-loader] ./node_modules/@types/fs-extra/index.d.ts:267:52 
    TS2694: Namespace 'NodeJS' has no exported member 'ArrayBufferView'. 
```

If I check in yarn.lock, it contains different versions of `fs-extra`:
```
"@types/fs-extra@9.0.1":
fs-extra@9.0.1:
fs-extra@^4.0.3:
fs-extra@^7.0.1:
fs-extra@^8.1.0:
```

Btw, in `node_modules/fs-extra/package.json` it shows `"version": "7.0.1"`.
My guess is that these version aren't compatible or that it tries to use the types from v9.0.1 for v7.0.1.
Any idea what I can do to eliminate these errors? :)
