comando topojson no agregado en npm install

Recibo un error cuando uso topojson diciendo que no se puede encontrar el comando. Creo que la instalación ha ido bien, pero simplemente no hay un comando para topojson, pero hay otros para topo2geo, topomerge, etc. Estoy usando nvm si eso es relevante y en mac.

Algunos detalles del nodo:

Grahams-MacBook-Air:data grahamfletcher$ ls -l /Users/grahamfletcher/.nvm/versions/node/v7.10.0/lib/node_modules/ total 0 drwxr-xr-x 3 grahamfletcher staff 102 14 Jul 22:01 @angular drwxr-xr-x 7 grahamfletcher staff 238 10 Oct 02:58 create-react-app drwxr-xr-x 11 grahamfletcher staff 374 14 Jul 23:35 eslint drwxr-xr-x 18 grahamfletcher staff 612 25 Jul 01:34 nodemon drwxr-xr-x 25 grahamfletcher staff 850 3 May 2017 npm drwxr-xr-x 13 grahamfletcher staff 442 22 Nov 13:00 ogr2ogr drwxr-xr-x 11 grahamfletcher staff 374 22 Nov 14:42 topojson 

topojson está ahí, pero …

  Grahams-MacBook-Air:data grahamfletcher$ ls -l /Users/grahamfletcher/.nvm/versions/node/v7.10.0/bin total 69760 lrwxr-xr-x 1 grahamfletcher staff 45 10 Oct 02:58 create-react-app -> ../lib/node_modules/create-react-app/index.js lrwxr-xr-x 1 grahamfletcher staff 40 14 Jul 23:35 eslint -> ../lib/node_modules/eslint/bin/eslint.js lrwxr-xr-x 1 grahamfletcher staff 70 15 Nov 11:10 geo2topo -> ../lib/node_modules/topojson/node_modules/topojson-server/bin/geo2topo lrwxr-xr-x 1 grahamfletcher staff 39 14 Jul 22:01 ng -> ../lib/node_modules/@angular/cli/bin/ng -rwxr-xr-x 1 grahamfletcher staff 35672760 3 May 2017 node lrwxr-xr-x 1 grahamfletcher staff 42 25 Jul 01:34 nodemon -> ../lib/node_modules/nodemon/bin/nodemon.js lrwxr-xr-x 1 grahamfletcher staff 38 3 May 2017 npm -> ../lib/node_modules/npm/bin/npm-cli.js lrwxr-xr-x 1 grahamfletcher staff 70 15 Nov 11:10 topo2geo -> ../lib/node_modules/topojson/node_modules/topojson-client/bin/topo2geo lrwxr-xr-x 1 grahamfletcher staff 71 15 Nov 11:10 topomerge -> ../lib/node_modules/topojson/node_modules/topojson-client/bin/topomerge lrwxr-xr-x 1 grahamfletcher staff 74 15 Nov 11:10 topoquantize -> ../lib/node_modules/topojson/node_modules/topojson-client/bin/topoquantize lrwxr-xr-x 1 grahamfletcher staff 76 15 Nov 11:10 toposimplify -> ../lib/node_modules/topojson/node_modules/topojson-simplify/bin/toposimplify 

No topojson aqui ??

Mi camino, que es decir algo acerca de un identificador válido. ¿Es esto un problema?

  Grahams-MacBook-Air:data grahamfletcher$ export $PATH -bash: export: `/Library/Frameworks/GDAL.framework/Programs:/opt/local/bin:/opt/local/sbin:/Users/grahamfletcher/.nvm/versions/node/v7.10.0/bin:/usr/local/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/opt/local/bin:/usr/local/share/dotnet:/Library/Frameworks/Mono.framework/Versions/Current/Commands': not a valid identifier