strapi-examples repo hello-world example fails on npm start without installing mongoose

hello-world-npm-start-without-mongoose-module.log

$ npm start
> hello-world@0.1.0 start /Users/georgep/Documents/GitHub/strapi-examples/hello-world
> node server.js

(node:3567) DeprecationWarning: current URL string parser is deprecated, and will be removed in a future version. To use the new parser, pass option { useNewUrlParser: true } to MongoClient.connect.
/Users/georgep/Documents/GitHub/strapi-examples/hello-world/node_modules/strapi-mongoose/node_modules/mongodb/lib/operations/mongo_client_ops.js:466
      throw err;
      ^

Error: Cannot find module 'mongoose'
    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:581:15)
    at Function.Module._load (internal/modules/cjs/loader.js:507:25)
    at Module.require (internal/modules/cjs/loader.js:637:17)
    at require (internal/modules/cjs/helpers.js:20:18)
    at Object.<anonymous> (/Users/georgep/Documents/GitHub/strapi-examples/hello-world/node_modules/mongoose-float/lib/index.js:3:16)
    at Module._compile (internal/modules/cjs/loader.js:689:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:700:10)
    at Module.load (internal/modules/cjs/loader.js:599:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:538:12)
    at Function.Module._load (internal/modules/cjs/loader.js:530:3)
    at Module.require (internal/modules/cjs/loader.js:637:17)
    at require (internal/modules/cjs/helpers.js:20:18)
    at module.exports.mongoose (/Users/georgep/Documents/GitHub/strapi-examples/hello-world/node_modules/strapi-mongoose/lib/utils/index.js:8:3)
    at _.forEach (/Users/georgep/Documents/GitHub/strapi-examples/hello-world/node_modules/strapi-mongoose/lib/index.js:272:55)
    at /Users/georgep/Documents/GitHub/strapi-examples/hello-world/node_modules/lodash/lodash.js:4911:15
    at baseForOwn (/Users/georgep/Documents/GitHub/strapi-examples/hello-world/node_modules/lodash/lodash.js:2996:24)
    at /Users/georgep/Documents/GitHub/strapi-examples/hello-world/node_modules/lodash/lodash.js:4880:18
    at Function.forEach (/Users/georgep/Documents/GitHub/strapi-examples/hello-world/node_modules/lodash/lodash.js:9344:14)
    at _.forEach (/Users/georgep/Documents/GitHub/strapi-examples/hello-world/node_modules/strapi-mongoose/lib/index.js:265:17)
    at /Users/georgep/Documents/GitHub/strapi-examples/hello-world/node_modules/lodash/lodash.js:4911:15
    at baseForOwn (/Users/georgep/Documents/GitHub/strapi-examples/hello-world/node_modules/lodash/lodash.js:2996:24)
    at /Users/georgep/Documents/GitHub/strapi-examples/hello-world/node_modules/lodash/lodash.js:4880:18
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! hello-world@0.1.0 start: `node server.js`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the hello-world@0.1.0 start script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     /Users/georgep/.npm/_logs/2018-10-03T01_58_35_476Z-debug.log