message: Don't import WeakMap polyfill in deep-map-keys
  Changelog-entry: Don't import WeakMap polyfill in deep-map-keys
  Change-type: patch
diff: @@ -137,6 +137,11 @@ const commonConfig = {
  test: /\.tsx?$/,
  use: 'ts-loader',
  },
  + // don't import WeakMap polyfill in deep-map-keys (required in corvus)
  + replace(/node_modules\/deep-map-keys\/lib\/deep-map-keys\.js$/, {
  + search: "var WeakMap = require('es6-weak-map');",
  + replace: '',
  + }),
  // force axios to use http backend (not xhr) to support streams
  replace(/node_modules\/axios\/lib\/defaults\.js$/, {
  search: './adapters/xhr',
  