Electron builder fails due to trailing comma in dependency package.json

[drclementshimizu]

I previously filed this bug with electron builder, but the issue was with app-builder.

Electron-Builder Version:
^24.13.3
Node Version:
10.7.0
Electron Version:
Electron Type (current, beta, nightly):
26.0.0
Target:
windows
Electron builder fails when there is a trailing comma in a package.json.
this is not allowed in json, but many systems are able to overlook it, because javascript allows it.

for example, a NPM dependency of a project's package.json has a trailing comma. and this produces a difficult to interpret error
https://www.npmjs.com/package/Babel

electron-builder

• electron-builder version=24.13.3 os=10.0.22631
• loaded configuration file=package.json ("build" field)
• description is missed in the package.json appPackageFile=MYAPP\package.json
• writing effective config file=dist\builder-effective-config.yaml
⨯ node_modules.Dependency.ReadString: expects " or n, but found }, error found in electron-userland/electron-builder#10 byte of ...|.x"
},
}|..., bigger context ...| "step": "0.0.x",
"underscore": "1.x.x"
},
}|...
Error reading package.json: MYAPP\node_modules\Babel\package.json

I was able to fix my error by ensuring the node_modules\Babel\package.json has no trailing commas

However, just a request to make that work without having to police my dependencies...