NoSuchLanguageError: No known languages found for specification English.

• Version: 22.10.5

• Electron Version: 8.5.5
• Electron Type (current, beta, nightly):

• Target: macOS

If I try to build our application with electron-builder it fails with the following exception:

  ⨯ No known languages found for specification English.  stackTrace=
                                                           NoSuchLanguageError: No known languages found for specification English.
                                                               at Function.bySpec (/Users/dmey/workspace/drive/node_modules/dmg-license/lib/Language.js:35:19)
                                                               at Object.indexByLanguage (/Users/dmey/workspace/drive/node_modules/dmg-license/lib/Language.js:81:41)
                                                               at labelCache (/Users/dmey/workspace/drive/node_modules/dmg-license/lib/assembleLicenses.js:92:35)
                                                               at Object.assembleLicenses [as default] (/Users/dmey/workspace/drive/node_modules/dmg-license/lib/assembleLicenses.js:117:23)
                                                               at dmgLicensePlist (/Users/dmey/workspace/drive/node_modules/dmg-license/lib/index.js:27:78)
                                                               at dmgLicense (/Users/dmey/workspace/drive/node_modules/dmg-license/lib/index.js:21:62)
                                                               at dmgLicenseFromJSON (/Users/dmey/workspace/drive/node_modules/dmg-license/lib/index.js:37:18)
                                                               at addLicenseToDmg (/Users/dmey/workspace/drive/node_modules/dmg-builder/src/dmgLicense.ts:57:9)

The exact same configuration is working on a workmates device.

We have a license_de.rtf, license_en.rtf, licenseButtons_de.json and a licenseButtons_en.json in our build directory.

Thanks for your help, best regards, Dominic

[argv-minus-one]

I borrowed a Mac and successfully reproduced your problem.

Problems

There are two things going on here:

1. The licenseButtons property lang is supposed to be a language tag (like en-us), but the documentation says to put a language name (like English) there. Doing this results in the error message you originally reported: No known languages found for specification English. I’ve opened issue #5887 about that.
2. The code that parses the language tag out of your file name doesn’t work correctly if you put a dash in it (as in languageButtons_en-us.json). electron-builder expects an underscore between the language and country (as in languageButtons_en_us.json), presumably for backward compatibility reasons. Putting a dash there results in the error message you reported just now: No known languages found for specification en-us-EN-US.

Solutions

• Remove the lang property from all licenseButtons files. It’s not needed with electron-builder and can only cause confusion.
• Rename all license files such that the language tag contains only underscores, not dashes: license_en_us.rtf, licenseButtons_en_us.json, license_de_de.rtf, licenseButtons_de_de.json.

Giving a Language Name

You can give a language name in the licenseButtons file (though it’s optional, except for languages marked “requires languageName” in the list). It goes in the languageName property, not lang. Example:

{
  "languageName": "English, do you speak it",
  "agree": "Agree",
  "disagree": "Disagree",
  "print": "Print",
  "save": "Save",
  "description": "Here is my own description"
}

However, I don’t think current macOS actually displays the language name anywhere. It still expects a language name to appear in the DMG metadata, but there probably isn’t any benefit in providing a languageName unless it’s required.

licenseButtons Are Optional

For several languages, including both US English and German, you don’t actually have to provide a licenseButtons file at all. For any language marked as having “predefined labels” in the list, those predefined labels will be used if you don’t provide your own.

[meydominic]

Many thanks @argv-minus-one , your solution works fine 😃