It asks to use Pug with own well-handled interpolation than just using JavaScript interpolation.
The following patterns are considered warnings:
const test = 'Hello'
pug`
div ${test}
`
const test = 'Hello'
pug`
Component(attr=${test})
`
The following patterns are not considered warnings:
const test = 'Hello'
pug`
div #{test}
`
const test = 'Hello'
pug`
Component(attr=test)
`
If you are not using Pug then you can disable this rule.