message: fix(bar-race): export interpolate methods
diff: @@ -14,15 +14,15 @@ type InterpolatableType = string | number | NumberArray | NumberArray[];
  const arraySlice = Array.prototype.slice;
  -function interpolateNumber(p0: number, p1: number, percent: number): number {
  +export function interpolateNumber(p0: number, p1: number, percent: number): number {
  return (p1 - p0) * percent + p0;
  }
  -function step(p0: any, p1: any, percent: number): any {
  +export function step(p0: any, p1: any, percent: number): any {
  return percent > 0.5 ? p1 : p0;
  }
  -function interpolate1DArray(
  +export function interpolate1DArray(
  out: NumberArray,
  p0: NumberArray,
  p1: NumberArray,
  @@ -35,7 +35,7 @@ function interpolate1DArray(
  }
  }
  -function interpolate2DArray(
  +export function interpolate2DArray(
  out: NumberArray[],
  p0: NumberArray[],
  p1: NumberArray[],
  