Popper-core: Cannot use tooltip's option placement with function ???

[KytoSai]

I use webpack 4 with two package:
"popper.js": "^1.14.3"
"tooltip.js": "^1.2.0"

I have config tooltip with option:

new Tooltip(document.getElementById('ttip'),{
  html: true,
  placement: 'left',
  title () {
    return this.dataset.ttipTitle
  }
})

It work fine. But i try change placement with function

new Tooltip(document.getElementById('ttip'),{
  html: true,
  placement () {
    return 'left'
  },
  title () {
    return this.dataset.ttipTitle
  }
})

It have error

Uncaught TypeError: placement.indexOf is not a function

I don't know why. Please help me fix it !

Thank you !

[FezVrasta]

Placement must be a string

[KytoSai]

Document: http://prntscr.com/k9r7ke
@FezVrasta ???

[FezVrasta]

The documentation is wrong, I'm sorry. We need to update it.

[KytoSai]

Thank you ! I like popper.js plugin

[piglovesyou]

@FezVrasta So all the PlacementFunction in the source code are supposed to be deleted? I'll take care of it.

[piglovesyou]

It can be fixed.