How to use the p5.prototype function in p5

Object.keys(this.lines).forEach((linekey) => {
      const line = this.lines[linekey]
      const circleA = this.circles[line.circleIndices[0]]
      const circleB = this.circles[line.circleIndices[1]]
      if (this.hasWebGL) {
        // TODO: figure out why p5 line() function not working
        // with hardware-accel graphics
        p.push()
        p.beginShape(P5.prototype.LINES)
        p.translate(circleA.x, circleA.y, 0)
        p.vertex(0, 0, 0)
        p.vertex((circleB.x - circleA.x),
          (circleB.y - circleA.y),
          0)
        p.fill(83, 76, 101) // prevent P5 spamming shader uniform warnings
        p.stroke(83, 76, 101)
        p.endShape()
        p.pop()
      } else {
        p.line(circleA.x, circleA.y, circleB.x, circleB.y)
      }
    })
  }

private loadImage = (path: string, successCallback: (pImg: any) => void, failureCallback: (e: any) => void) => {
    const match = /^delir:(.+)/.exec(path)

    if (match) {
      path = this.resolver.resolveAsset(match[1])!.path
    }

    return P5.prototype.loadImage.call(this.p5, path, successCallback, failureCallback)
  }
}