writeMap: Export and display the map
In rleafmap: Interactive Maps with R and Leaflet

This function combines all the elements specified by the user and write the corresponding HTML and Javascript code in a local directory.

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writeMap(..., dir = getwd(), prefix = "", width = 700, height = 400,
  setView = NULL, setZoom = NULL, interface = NULL, lightjson = FALSE,
  directView = c("viewer", "browser", "disabled"), leaflet.loc = "online")

`...`	`basemap` and `spl` objects to embed into the map
`dir`	a character string giving the directory path to export the map. Default is the working directory.
`prefix`	a character string to add a prefix to file names. This allows multiple exportations in the same directory.
`width,height`	the width and height of the map, in pixels.
`setView`	a numeric vector of the form `c(x, y)` setting the initial geographical center of the map.
`setZoom`	a numeric value setting the initial map zoom.
`interface`	an `ui` object created with `ui` to customize the interface controls.
`lightjson`	logical. Should GeoJSON files size be reducedby supressing extra whitespace characters and rounding numeric values? Default is `FALSE`. This is currently not compatible with RMarkdown popups.
`directView`	a character string indicating if and how should the map be displayed. Default option "`viewer`" uses (if available) the RStudio HTML viewer to display the map, "`browser`" opens the map into the web browser and "`disabled`" disables direct display.
`leaflet.loc`	a character string specifying the location (directory) of the leaflet library. If set to "`online`" (default), the library is loaded from the leaflet official CDN and requires an internet connection.