npm WARN [email protected] requires a peer of ajv@^6.9.1 but none is installed. You must install peer dependencies yourself. code example

Example 1: npm WARN [email protected] requires a peer of tslint@^5.0.0 || ^6.0.0 but none is installed. You must install peer dependencies yourself.

npm install --save-dev xxxxx
# Eg
npm install --save-dev tslint@^5.0.0

Example 2: npm WARN [email protected] requires a peer of tslint@^5.0.0 || ^6.0.0 but none is installed. You must install peer dependencies yourself.

npm install --save-dev xxxxx