npm start fails with `FSEventStreamStart: register_with_server: ERROR: f2d_register_rpc() => (null) (-21)`

Running OS X 10.10.1
The npm install worked fine, but I can’t seem to get npm start to work. It fails with a long stream of identical errors:

2015-02-02 10:56 node[24294] (FSEvents.framework) FSEventStreamStart: register_with_server: ERROR: f2d_register_rpc() => (null) (-21)
2015-02-02 10:56 node[24294] (FSEvents.framework) FSEventStreamStart: register_with_server: ERROR: f2d_register_rpc() => (null) (-21)
2015-02-02 10:56 node[24294] (FSEvents.framework) FSEventStreamStart: register_with_server: ERROR: f2d_register_rpc() => (null) (-21)
2015-02-02 10:56 node[24294] (FSEvents.framework) FSEventStreamStart: register_with_server: ERROR: f2d_register_rpc() => (null) (-21)

More info on environment:

$ npm --version
1.3.14

$ node --version
v0.10.22

Seems like it might be a lower level node issue (nodejs/node-v0.x-archive#5463) though a cursory search indicates that there may be workarounds it in the app (e.g. maybe there are ways to reduce the number of files being watched?).

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