hitting limits with large GeoJSON file

[pmgh1]

I have a large hexagon grid that I thought would be a perfect candidate for topojson.

But I seem to be hitting the limits of ndjson and geo2topo.

There are a few million (3 or 4) hexagons in the GeoJSON file and the file is about 1GB.

Thanks!

Can anything be done ?
Running on Windows 7
node: 10.13
npm: 5.6
ndjson-split 0.3.1
geo2topo 3.0.0

D:>ndjson-split 'd.features' < output_hexgrid_oneline.json > hexgrid.ndjson
readline.js:421
string = this._line_buffer + string;
^
RangeError: Invalid string length
at Interface._normalWrite (readline.js:421:32)
at ReadStream.ondata (readline.js:149:10)
at ReadStream.emit (events.js:182:13)
at addChunk (_stream_readable.js:283:12)
at readableAddChunk (_stream_readable.js:264:11)
at ReadStream.Readable.push (_stream_readable.js:219:10)
at lazyFs.read (internal/fs/streams.js:181:12)
at FSReqWrap.wrapper [as oncomplete] (fs.js:460:17)

D:>geo2topo tracts=output_hexgrid_oneline.json > hex_topo.json
buffer.js:646
return this.utf8Slice(0, this.length);
^
Error: Cannot create a string longer than 0x3fffffe7 characters
at Buffer.toString (buffer.js:646:17)
at JSON.parse ()
at ReadStream. (C:\Users\steve.o'brien\AppData\Roaming\npm\node_modules\topojson\node_modules\topojson-server\bin\geo2topo:107:46)
at ReadStream.emit (events.js:187:15)
at endReadableNT (_stream_readable.js:1094:12)
at process._tickCallback (internal/process/next_tick.js:63:19)

[dfrankow]

I am hitting this with https://github.com/jgoodall/us-maps/blob/master/geojson/zcta5.geo.json