How to fix 'Paths configuration XXX uses wildcards which are being deprecated for just leaving a trailing "/" to indicate folder paths.' and how to fix 'defaultJSExtensions configuration option is deprecated ...'

[ericnewton76]

Given a config.js similar to:

System.config({
  defaultJSExtensions: true,
  transpiler: "plugin-babel",
  babelOptions: {
    "optional": [
      "runtime",
      "optimisation.modules.system"
    ]
  },
  paths: {
    "github:*": "jspm_packages/github/*",
    "npm:*": "jspm_packages/npm/*"
  },
  warnings: true,

  meta: {
    "*": {
      "babelOptions": {
        "react": true
      },
      "defaultExtension": "js"
    }
  },

  map: {
    "accounting": "npm:[email protected]",
    "babel": "npm:[email protected]",
    "babel-runtime": "npm:[email protected]",
    "core-js": "npm:[email protected]",
"---snip---":"--------------------snip-------------------------"
  }

I'm not sure how to fix this warning. Tried removing the wildcard from either side and both sides but still get either deprecation warning or failure to find package.