Function isBuiltinShader

isBuiltinShader(
    shader: string,
): shader is
    | "chromatic"
    | "circleBlur"
    | "fisheye"
    | "glitch"
    | "grayscale"
    | "noise"
    | "pixel"
    | "radialBlur"
    | "shockwave"
    | "vignette"
Check whether a shader name refers to a known built-in shader.
Parameters
- shader: string
  Shader name string.
Returns shader is
    | "chromatic"
    | "circleBlur"
    | "fisheye"
    | "glitch"
    | "grayscale"
    | "noise"
    | "pixel"
    | "radialBlur"
    | "shockwave"
    | "vignette"
True if it's a recognized built-in.
- Defined in extra.ts:247