compiler error, undefined is not assignable to number

[carwe]

map/src/components/coordinates.ts

Line 437 in 6bb6459

points[i] = new Coordinates(point.lat2, point.lon2);

ERROR in /home/user/Projekte/map/src/components/coordinates.ts
./src/components/coordinates.ts 437:44-54
[tsl] ERROR in /home/user/Projekte/map/src/components/coordinates.ts(437,45)
      TS2345: Argument of type 'number | undefined' is not assignable to parameter of type 'number'.
  Type 'undefined' is not assignable to type 'number'.

A possible workaround (to quickly get a working build) is to assert them as not-undefined (see https://stackoverflow.com/questions/52838335/ts2345-argument-of-type-number-undefined-is-not-assignable-to-parameter-of) like so:
points[i] = new Coordinates(point.lat2!, point.lon2!);

... or to globally disable the compiler-check for that (strictNullChecks) (nope).