ndjson-split output artifacts in PowerShell #39

Inspired by the Command Line Cartography series, I started out implementing the same sequence for the state of Texas (this issue relates to step 8 in that sequence). Following this, I decided to automate this process by writing a PowerShell script that generates a choropleth based on a provided FIPS code.

With this in mind, I ran into a pretty big roadblock when trying to generate the NDJSON version of the census data. I've created a GitHub Repo to demonstrate the issue, but here is the short of it:

When calling ndjson-cat "{json-file}" | ndjson-split "d.slice(1)", I'm getting odd output artifacts in PowerShell:

resulting .ndjson

E:\Jaime\Desktop\Work\Projects\ps-mapping-issue>node  "C:\Users\jpsti\AppData\Local\Yarn\Data\global\node_modules\.bin\\..\ndjson-cli\ndjson-split" d.slice(1) 
["1201","01","001","021000"]
["1293","01","001","021100"]
/* additional data removed */
["1880","01","133","965800"]
["834","01","133","965900"]

E:\Jaime\Desktop\Work\Projects\ps-mapping-issue>

I initially realized there was an issue when I would pipe this into the ndjson-map call directly after ndjson-split, and it was providing me with this error:

stdin:1

^
SyntaxError: Unexpected end of JSON input

If I run this from a command prompt instead, the desired output is provided.

The following block works just fine in PowerShell:

shp2json "maps/$($shape)/$($shape).shp" | `
      geoproject "d3.$($state.projection).fitSize([$width, $height], d)" | `
      ndjson-split "d.features" | `
      ndjson-map "d.id = d.properties.GEOID.slice(2), d" > "data/$($state.name).ndjson"

The only thing I can think of that would be different in this scenario is that this call to ndjson-split is simply accessing a property of the data, as opposed to calling a JavaScript Array function.