software PWM error? "not a valid PWM pin"

I am getting a pin error when trying to send a simple led.fade to a non-PWM pin. My understanding was that all pins should now use the software PWM by default.

Here's a reduced script:

const five = require("johnny-five");
const Raspi = require("raspi-io").RaspiIO;

const board = new five.Board({
  io: new Raspi()
});

board.on("ready", () => {
  new five.Led("P1-7").fade(255, 1000);
});

That works if I connect to one of the PWM pins (P1-12, P1-32 & P1-33) but fails on all the other GPIO pins I tried.

Here's an example error:

Error: Pin Error: 7 is not a valid PWM pin (Led)
    at Function.Pins.Error (/usr/app/node_modules/johnny-five/lib/board.pins.js:81:9)
    at Led.value (/usr/app/node_modules/johnny-five/lib/led/led.js:89:22)
    at Led.(anonymous function) [as @@render] (/usr/app/node_modules/johnny-five/lib/led/led.js:349:15)
    at Animation.loopFunction (/usr/app/node_modules/johnny-five/lib/animation.js:293:32)
    at Immediate.processQueue (/usr/app/node_modules/temporal/lib/temporal.js:195:20)
    at processImmediate (timers.js:637:19)
    at process.topLevelDomainCallback (domain.js:120:23)

Am I doing something wrong or missing a step? This note from the 10.0.0 changelog makes me think the above should work.

BREAKING CHANGE: removed the enableSoftPwm and switched to using software PWM by default for all pins

Note: this means that hardware PWM is not used on the pins that support hardware PWM, we still use software PWM

My hardware is an old Raspberry Pi 2 Model B v 1.1. I don't think it matters, but the script runs in a Docker container.

nebrius / raspi-io

software PWM error? "not a valid PWM pin" #115