output.split is not a function

[zeke]

$ electron-forge --version
✔ Checking your system
4.2.0


$ electron-forge install hypermodules/hyperamp
✔ Checking your system
✔ Searching for Releases
Found latest release: v0.5.8
? Multiple potential assets found, please choose one from the list below: Hyperamp-0.5.8.dmg
✖ Installing Application

An unhandled error has occurred inside Forge:
output.split is not a function
TypeError: output.split is not a function
    at /usr/local/lib/node_modules/electron-forge/dist/util/hdiutil.js:29:27
    at Generator.next (<anonymous>)
    at Generator.tryCatcher (/usr/local/lib/node_modules/electron-forge/node_modules/bluebird/js/release/util.js:16:23)
    at PromiseSpawn._promiseFulfilled (/usr/local/lib/node_modules/electron-forge/node_modules/bluebird/js/release/generators.js:97:49)
    at Promise._settlePromise (/usr/local/lib/node_modules/electron-forge/node_modules/bluebird/js/release/promise.js:574:26)
    at Promise._settlePromise0 (/usr/local/lib/node_modules/electron-forge/node_modules/bluebird/js/release/promise.js:614:10)
    at Promise._settlePromises (/usr/local/lib/node_modules/electron-forge/node_modules/bluebird/js/release/promise.js:693:18)
    at Async._drainQueue (/usr/local/lib/node_modules/electron-forge/node_modules/bluebird/js/release/async.js:133:16)
    at Async._drainQueues (/usr/local/lib/node_modules/electron-forge/node_modules/bluebird/js/release/async.js:143:10)
    at Immediate.Async.drainQueues (/usr/local/lib/node_modules/electron-forge/node_modules/bluebird/js/release/async.js:17:14)
    at runCallback (timers.js:781:20)
    at tryOnImmediate (timers.js:743:5)
    at processImmediate [as _immediateCallback] (timers.js:714:5)

[zeke]

Saw it break again for a different app's DMG, but worked for its ZIP:

$ electron-forge install 0x00A/scratches
✔ Checking your system
✔ Searching for Releases
Found latest release: 0.0.5
? Multiple potential assets found, please choose one from the list below: Scratches-0.0.5.dmg
Downloading 0x00A-scratches-0.0.5-Scratches-0.0.5.dmg
[============================================>] 100.0% of 50.36 MB (2.24 MB/s)
✖ Installing Application

An unhandled error has occurred inside Forge:
output.split is not a function
TypeError: output.split is not a function
    at /usr/local/lib/node_modules/electron-forge/dist/util/hdiutil.js:29:27
    at Generator.next (<anonymous>)
    at Generator.tryCatcher (/usr/local/lib/node_modules/electron-forge/node_modules/bluebird/js/release/util.js:16:23)
    at PromiseSpawn._promiseFulfilled (/usr/local/lib/node_modules/electron-forge/node_modules/bluebird/js/release/generators.js:97:49)
    at Promise._settlePromise (/usr/local/lib/node_modules/electron-forge/node_modules/bluebird/js/release/promise.js:574:26)
    at Promise._settlePromise0 (/usr/local/lib/node_modules/electron-forge/node_modules/bluebird/js/release/promise.js:614:10)
    at Promise._settlePromises (/usr/local/lib/node_modules/electron-forge/node_modules/bluebird/js/release/promise.js:693:18)
    at Async._drainQueue (/usr/local/lib/node_modules/electron-forge/node_modules/bluebird/js/release/async.js:133:16)
    at Async._drainQueues (/usr/local/lib/node_modules/electron-forge/node_modules/bluebird/js/release/async.js:143:10)
    at Immediate.Async.drainQueues (/usr/local/lib/node_modules/electron-forge/node_modules/bluebird/js/release/async.js:17:14)
    at runCallback (timers.js:781:20)
    at tryOnImmediate (timers.js:743:5)
    at processImmediate [as _immediateCallback] (timers.js:714:5)

~/git/electron/electron-security-review blog-post 31s
$ electron-forge install 0x00A/scratches
✔ Checking your system
✔ Searching for Releases
Found latest release: 0.0.5
? Multiple potential assets found, please choose one from the list below: Scratches-0.0.5-mac.zip
Downloading 0x00A-scratches-0.0.5-Scratches-0.0.5-mac.zip
[============================================>] 100.0% of 48.6 MB (2.18 MB/s)
✔ Installing Application