Argument of type '{ icon: DivIcon; }' is not assignable to parameter of type 'MarkerOptions | undefined'.

[cornelius-agrippa]

Hello,

I was trying to run this project for the first time but I'm having some trouble with it.

I did the usual npm install and then npm run dev to get it running, however I get the following errors:

ERROR in [at-loader] src\ui\map\SensorMap.tsx:78:87
    TS2345: Argument of type '{ icon: DivIcon; }' is not assignable to parameter of type 'MarkerOptions | undefined'.
  Type '{ icon: DivIcon; }' is not assignable to type 'MarkerOptions'.
    Types of property 'icon' are incompatible.
      Type 'DivIcon' is not assignable to type 'Icon | undefined'.
        Type 'DivIcon' is not assignable to type 'Icon'.
          Types of property 'options' are incompatible.
            Type 'DivIconOptions' is not assignable to type 'IconOptions'.
              Types of property 'iconUrl' are incompatible.
                Type 'string | undefined' is not assignable to type 'string'.
                  Type 'undefined' is not assignable to type 'string'.

ERROR in [at-loader] src\ui\map\SensorMap.tsx:112:55
    TS2345: Argument of type '{ icon: DivIcon; }' is not assignable to parameter of type 'MarkerOptions | undefined'.
  Type '{ icon: DivIcon; }' is not assignable to type 'MarkerOptions'.
    Types of property 'icon' are incompatible.
      Type 'DivIcon' is not assignable to type 'Icon | undefined'.
        Type 'DivIcon' is not assignable to type 'Icon'.

ERROR in [at-loader] src\ui\map\SensorMap.tsx:115:9
    TS2532: Object is possibly 'undefined'.

ERROR in [at-loader] src\ui\map\SensorMap.tsx:126:15
    TS2532: Object is possibly 'undefined'.
webpack: Failed to compile.

I have a feeling something's wrong with the leaflet package, but I could be wrong.

Do you have any idea what could be wrong?

Node version is 7.5.0
NPM version is 4.1.2

My best regards