How to transform normals to world space for lighting

vertex.glsl

out vec3 vWorldSpaceNormal;

void main()
{
  vec4 worldSpaceNormal = modelMatrix * vec4( normal, 0.0 );
  
  vWorldSpaceNormal = normalize( worldSpaceNormal.xyz );
  
  gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );
  
 }