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Sadparrot Automated updating of API pages at this location, to reflect patch changes, has ceased from 10.1.7 onwards.

Needs summary. 

texture, colorR, colorG, colorB, colorA = GetUnitPowerBarTextureInfo(unitToken, textureIndex [, timerIndex])
                                        = GetUnitPowerBarTextureInfoByID(barID, textureIndex)

Arguments

GetUnitPowerBarTextureInfo

unitToken
string : UnitId
textureIndex
number
timerIndex
number?

GetUnitPowerBarTextureInfoByID

barID
number
textureIndex
number

Returns

texture
number
colorR
number
colorG
number
colorB
number
colorA
number

Patch changes

Battle for Azeroth Patch 8.3.0 (2020-01-14): Added. Replaces UnitAlternatePowerTextureInfo() [1]