mine/node_modules/less-loader/dist/options.json

{
  "title": "Less Loader options",
  "type": "object",
  "properties": {
    "lessOptions": {
      "description": "Options to pass through to `Less`.",
      "link": "https://github.com/webpack-contrib/less-loader#lessoptions",
      "anyOf": [
        {
          "type": "object",
          "additionalProperties": true
        },
        {
          "instanceof": "Function"
        }
      ]
    },
    "additionalData": {
      "description": "Prepends/Appends `Less` code to the actual entry file.",
      "link": "https://github.com/webpack-contrib/less-loader#additionalData",
      "anyOf": [
        {
          "type": "string"
        },
        {
          "instanceof": "Function"
        }
      ]
    },
    "sourceMap": {
      "description": "Enables/Disables generation of source maps.",
      "link": "https://github.com/webpack-contrib/less-loader#sourcemap",
      "type": "boolean"
    },
    "webpackImporter": {
      "description": "Enables/Disables default `webpack` importer.",
      "link": "https://github.com/webpack-contrib/less-loader#webpackimporter",
      "type": "boolean"
    },
    "implementation": {
      "description": "The implementation of the `Less` to be used.",
      "link": "https://github.com/webpack-contrib/less-loader#implementation",
      "anyOf": [
        {
          "type": "string"
        },
        {
          "type": "object"
        }
      ]
    }
  },
  "additionalProperties": false
}