---Added by npm team--- > See this comment https://github.com/npm/cli/issues/8153#issuecomment-2718937461 for the proper way to have package-level config that does not collide with npm config **Summary** When running `npm --version`, npm issues warnings about some custom configuration keys in my `.npmrc`. These warnings indicate that the keys will stop working in the next major version of npm. **Environment** - **node version:** v23.9.0 - **npm version:** 11.2.0 - *Win11* **Steps to Reproduce** 1. Create a `.npmrc` file with the following content: ```txt registry="https://registry.npmmirror.com/" electron_mirror="https://npmmirror.com/mirrors/electron/" electron_custom_dir="{{ version }}" electron_builder_binaries_mirror="http://npmmirror.com/mirrors/electron-builder-binaries/" ``` 2. Run the command: ```bash npm --version ``` 3. Observe the following warnings: ```txt npm warn Unknown user config "electron_mirror". This will stop working in the next major version of npm. npm warn Unknown user config "electron_custom_dir". This will stop working in the next major version of npm. npm warn Unknown user config "electron_builder_binaries_mirror". This will stop working in the next major version of npm. ``` **Expected Behavior** The custom configuration keys should be recognized, or there should be documentation clarifying the correct way to set these options without triggering warnings. **Actual Behavior** The custom keys (`electron_mirror`, `electron_custom_dir`, and `electron_builder_binaries_mirror`) are not recognized by npm, resulting in warning messages about their future deprecation. **Questions** 1. Are these warnings expected with the current configuration, or is there a recommended way to define these custom options? 2. Will these configurations be supported in future versions of npm, or should they be modified/removed to ensure compatibility? **Additional Context** I am using custom mirror URLs to optimize package and binary downloads. Any guidance or documentation regarding the proper configuration for these settings would be greatly appreciated.