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[14:05:10.212] [ERROR]  Error: EACCES, Permission denied
    at /home/pi/MagicMirror/modules/MMM-Swipe/node_modules/mmm-gpio/lib/gpio.js:30:18
    at ChildProcess.exithandler (child_process.js:299:7)
    at ChildProcess.emit (events.js:210:5)
    at maybeClose (internal/child_process.js:1021:16)
    at Socket.<anonymous> (internal/child_process.js:430:11)
    at Socket.emit (events.js:210:5)
    at Pipe.<anonymous> (net.js:658:12) {
  errno: 13,
  code: 'EACCES',
  syscall: 'init'
}
[14:05:10.252] [LOG]    MagicMirror will not quit, but it might be a good idea to check why this happened. Maybe no internet connection?
[14:05:10.254] [LOG]    If you think this really is an issue, please open an issue on GitHub: https://github.com/MichMich/MagicMirror/issues
[14:05:10.276] [LOG]    Whoops! There was an uncaught exception...
[14:05:10.278] [ERROR]  Error: EACCES, Permission denied
    at /home/pi/MagicMirror/modules/MMM-Swipe/node_modules/mmm-usonic/lib/usonic.js:32:20
    at ChildProcess.exithandler (child_process.js:299:7)
    at ChildProcess.emit (events.js:210:5)
    at maybeClose (internal/child_process.js:1021:16)
    at Socket.<anonymous> (internal/child_process.js:430:11)
    at Socket.emit (events.js:210:5)
    at Pipe.<anonymous> (net.js:658:12) {
  errno: 13,
  code: 'EACCES',
  syscall: 'init'
}

Error: unknown hardware: “BCM2835”
at /home/pi/MagicMirror/modules/MMM-Swipe/node_modules/mmm-usonic/lib/usonic.js:34:29

no idea, you would have to read the code there

readme:

	{
		module: 'MMM-Swipe',
		position: 'bottom_left',	// Doesn't matter after it's setup.  It should be blank.
									// Best results in one of the side regions like: bottom_left
		config: {
			// See 'Configuration options' for more information.
			echoLeftPin: 24, 		//Left Sensor's BCM Numbered Echo pin - REQUIRED
			triggerLeftPin: 23, 	//Left Sensor's BCM Numbered trigger pin - REQUIRED
			echoRightPin: 26, 		//Right Sensor's BCM Numbered Echo pin - REQUIRED
			triggerRightPin: 25, 	//Right Sensor's BCM Numbered trigger pin - REQUIRED
			useAsButton: false,		//Enable a GPIO output when you "press".
			buttonPin: 8,
			verbose: false,		
			calibrate: false	
		}
	}

My config:

	{
		module: 'MMM-Swipe',
		position: 'bottom_left',	// Doesn't matter after it's setup.  It should be blank.
									// Best results in one of the side regions like: bottom_left
		config: {
			// See 'Configuration options' for more information.
			echoLeftPin: 27, 		//Left Sensor's BCM Numbered Echo pin - REQUIRED
			triggerLeftPin: 24, 	//Left Sensor's BCM Numbered trigger pin - REQUIRED
			echoRightPin: 23, 		//Right Sensor's BCM Numbered Echo pin - REQUIRED
			triggerRightPin: 22, 	//Right Sensor's BCM Numbered trigger pin - REQUIRED
			useAsButton: false,		//Enable a GPIO output when you "press".
			buttonPin: 8,
			verbose: true,		
			calibrate: true	
		}
	},

[13:13:56.836] [LOG]    Error: unknown hardware: "BCM2835"
    at /home/pi/MagicMirror/modules/MMM-Swipe/node_modules/mmm-gpio/lib/gpio.js:34:29
    at ChildProcess.exithandler (child_process.js:299:7)
    at ChildProcess.emit (events.js:210:5)
    at maybeClose (internal/child_process.js:1021:16)
    at Socket.<anonymous> (internal/child_process.js:430:11)
    at Socket.emit (events.js:210:5)
    at Pipe.<anonymous> (net.js:658:12)
[13:13:56.862] [LOG]    Error: unknown hardware: "BCM2835"
    at /home/pi/MagicMirror/modules/MMM-Swipe/node_modules/mmm-usonic/lib/usonic.js:34:29
    at ChildProcess.exithandler (child_process.js:299:7)
    at ChildProcess.emit (events.js:210:5)
    at maybeClose (internal/child_process.js:1021:16)
    at Socket.<anonymous> (internal/child_process.js:430:11)
    at Socket.emit (events.js:210:5)
    at Pipe.<anonymous> (net.js:658:12)

Any Ideas?

[1580:0329/130746.224199:FATAL:electron_main_delegate.cc(211)] Running as root without --no-sandbox is not supported. See https://crbug.com/638180.

Any idea what that means?

the package.json file in MMM-Swipe and change

this

    "postinstall": "node_modules/.bin/electron-rebuild -e ../../node_modules/electron-prebuilt"

to this

    "postinstall": "node_modules/.bin/electron-rebuild"

sadly has same labeling and same verbiage (module)

he wrote MMM-Swipe, which uses his library (mmm-usonic)

> electron-rebuild -e ../../node_modules/electron-prebuilt


An unhandled error occurred inside electron-rebuild
Unable to find electron's version number, either install it or specify an explicit version

Error: Unable to find electron's version number, either install it or specify an explicit version
    at /home/pi/MagicMirror/modules/MMM-Swipe/node_modules/electron-rebuild/lib/src/cli.js:86:19
    at Generator.next (<anonymous>)
    at fulfilled (/home/pi/MagicMirror/modules/MMM-Swipe/node_modules/electron-rebuild/lib/src/cli.js:6:58)
npm ERR! code ELIFECYCLE
npm ERR! errno 255
npm ERR! MMM-Swipe@1.1.1 postinstall: `electron-rebuild -e ../../node_modules/electron-prebuilt`
npm ERR! Exit status 255
npm ERR! 
npm ERR! Failed at the MMM-Swipe@1.1.1 postinstall script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

it says it cant find the electron version number, but idk how to fix it

so rn i did the install in the /home/pi/node_modules

what install?

MMM_Swipe (https://github.com/mochman/MMM-Swipe)

already lists that dependency in package.json

  "dependencies": {
    "math-statistics": "latest",
    "mmm-usonic": "latest",
    "mmm-gpio": "latest"
  },

and lists that file in node_helper.js

const usonic = require('mmm-usonic');

the install instructions say

1. Navigate into your MagicMirror's modules folder and execute git clone https://github.com/mochman/MMM-Swipe.git. A new folder labeled MMM-Swipe will appear, cd into it.

2 Execute npm install to install the dependencies

if u are adding a library to a module, then in the module folder

/home/pi/MagicMirror/modules/module_name   (MMM-Swipe in this case)

you would do

npm install --save mmm-usonic

if all of that is ok, then sometimes a module ships a library that is built on a specific level of electron,
and our is different…
so do

cd ~/MagicMirror
npm install electron-rebuild
node_modules/.bin/electron-rebuild

to rebuild the used libraries to match the installed electron version

So then when i run the MagicMirror using npm start these errors show up

home/pi/MagicMirror/node_modules/electron/dist/electron: symbol lookup error: /home/pi/node_modules/mmm-usonic/build/Release/usonic.node: undefined symbol: _ZN2v816FunctionTemplate3NewEPNS_7IsolateEPFvRKNS_20FunctionCallbackInfoINS_5ValueEEEENS_5LocalIS4_EENSA_INS_9SignatureEEEiNS_19ConstructorBehaviorENS_14SideEffectTypeE
npm ERR! code ELIFECYCLE
npm ERR! syscall spawn
npm ERR! file sh
npm ERR! errno ENOENT
npm ERR! magicmirror@2.10.1 start: `./run-start.sh`
npm ERR! spawn ENOENT
npm ERR! 
npm ERR! Failed at the magicmirror@2.10.1 start script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     /root/.npm/_logs/2020-03-28T03_18_41_984Z-debug.log