lastSlice is not defined in noqsa line 846

[nrkn]

https://github.com/dperini/nwmatcher/blob/master/src/nwmatcher-noqsa.js#L846

Confirmed in both browser, and node.js+jsdom

This is the smallest I could get it down to:

const el1 = document.createDocumentFragment()
const child1 = document.createElement( 'div' )
el1.appendChild( child1 )

const el2 = document.createElement( 'section' )
const child2 = document.createElement( 'p' )
el2.appendChild( child2 )

first( 'span', el1 )
first( 'span', el2 )

• throws TypeError: lastSlice is undefined on the second call to first - expected was returns null
• el1 must be a document fragment
• el1 and el2 must have at least one child
• the same selector must be used on both
• neither el2 nor the child elements' tagNames seem to matter
• the selector doesn't seem to matter

[dperini]

Acknowledge the bug ... thank you for reporting the issue.
A fix is on the way, also this bug did exist at least since 1.3.x so it was well hidden :)

[dperini]

Fixed ! Doing some test before pushing to npm.
Thank you again for reporting.
👍