TypeError: defaultsDeep is not a function

[kawasako]

lodash seem to be missing.

> nuxt build && backpack build

  nuxt:build Building... +0ms
  nuxt: Call build:before hooks (4) +0ms
  nuxt:pwa Adding icons +0ms
  nuxt:pwa Adding manifest +403ms
  nuxt:pwa Adding meta +0ms
  nuxt:pwa No host specified, skipping og:image +1ms
  nuxt:pwa Adding workbox +0ms
  nuxt: Call error hooks (1) +405ms

 ERROR  build:before

  TypeError: defaultsDeep is not a function

  - index.js:105 ModuleContainer.getOptions
    [mochigome]/[@nuxtjs]/workbox/index.js:105:19

  - index.js:24 hook
    [mochigome]/[@nuxtjs]/workbox/index.js:24:26

  - nuxt.js:122 fn
    [mochigome]/[nuxt]/lib/core/nuxt.js:122:47

  - utils.js:96 promise.then
    [mochigome]/[nuxt]/lib/common/utils.js:96:43