npm ERR! missing: node-sass@^4.14.1, required by [email protected] code example

Example 1: vuejs install [email protected] requires a peer of ajv@^6.9.1

var Ajv = require('ajv');var ajv = new Ajv;require('ajv-keywords')(ajv); ajv.validate({ instanceof: 'RegExp' }, /.*/); // trueajv.validate({ instanceof: 'RegExp' }, '.*'); // false

Example 2: vuejs install [email protected] requires a peer of ajv@^6.9.1

npm install ajv-keywords