Stuck on an issue?

Lightrun Answers was designed to reduce the constant googling that comes with debugging 3rd party libraries. It collects links to all the places you might be looking at while hunting down a tough bug.

And, if you’re still stuck at the end, we’re happy to hop on a call to see how we can help out.

Build fails with "Error: `background` missing from JSON Specification"

See original GitHub issue

This only recently started happening as we wiped our npm cache and it updated to the latest patch release. The docs suggest that this attribute is optional.

Error: `background` missing from JSON Specification
    at Object.fn (/Users/distiller/propeller-desktop/node_modules/appdmg-tf/lib/appdmg.js:152:12)
    at Pipeline._runStep (/Users/distiller/propeller-desktop/node_modules/appdmg-tf/lib/pipeline.js:44:8)
    at Pipeline._run (/Users/distiller/propeller-desktop/node_modules/appdmg-tf/lib/pipeline.js:93:8)
    at Function.next.skip (/Users/distiller/propeller-desktop/node_modules/appdmg-tf/lib/pipeline.js:39:21)
    at Object.fn (/Users/distiller/propeller-desktop/node_modules/appdmg-tf/lib/appdmg.js:111:37)
    at Pipeline._runStep (/Users/distiller/propeller-desktop/node_modules/appdmg-tf/lib/pipeline.js:44:8)
    at Pipeline._run (/Users/distiller/propeller-desktop/node_modules/appdmg-tf/lib/pipeline.js:93:8)
    at Function.next.skip (/Users/distiller/propeller-desktop/node_modules/appdmg-tf/lib/pipeline.js:39:21)
    at Object.fn (/Users/distiller/propeller-desktop/node_modules/appdmg-tf/lib/appdmg.js:94:37)
    at Pipeline._runStep (/Users/distiller/propeller-desktop/node_modules/appdmg-tf/lib/pipeline.js:44:8)
    at Pipeline._run (/Users/distiller/propeller-desktop/node_modules/appdmg-tf/lib/pipeline.js:93:8)
    at next (/Users/distiller/propeller-desktop/node_modules/appdmg-tf/lib/pipeline.js:33:23)
    at /Users/distiller/propeller-desktop/node_modules/appdmg-tf/lib/appdmg.js:84:9
    at FSReqWrap.cb [as oncomplete] (fs.js:251:19)
From previous event:
    at OsXPackager.packageInDistributableFormat (/Users/distiller/propeller-desktop/node_modules/electron-builder/src/osxPackager.ts:183:20)
    at nonMasPromise.doPack.then.then (/Users/distiller/propeller-desktop/node_modules/electron-builder/src/osxPackager.ts:58:74)
From previous event:
    at OsXPackager.<anonymous> (/Users/distiller/propeller-desktop/node_modules/electron-builder/src/osxPackager.ts:58:10)
    at undefined.next (native)
From previous event:
    at tsAwaiter (/Users/distiller/propeller-desktop/node_modules/electron-builder/src/awaiter.ts:10:47)
    at Object.build (/Users/distiller/propeller-desktop/node_modules/electron-builder/src/builder.ts:30:59)
    at Object.<anonymous> (/Users/distiller/propeller-desktop/node_modules/electron-builder/src/build-cli.ts:47:2)
    at Module._compile (module.js:541:32)
    at Object.Module._extensions..js (module.js:550:10)
    at Module.load (module.js:456:32)
    at tryModuleLoad (module.js:415:12)
    at Function.Module._load (module.js:407:3)
    at Function.Module.runMain (module.js:575:10)
    at startup (node.js:160:18)
    at node.js:445:3