uniforms.js

function getMaterial(uniformsCallback) {
  const material = new THREE.MeshStandardMaterial(/* ... */);
  
  material.onBeforeCompile = shader => {
    shader.uniforms.time = { value: 0 };
    if(uniformsCallback) uniformsCallback(shader.uniforms);
    shader.fragmentShader = applyPatches(shader.fragmentShader, {
      'varying vec3 vViewPosition;': `$&
        uniform float time;
      `
    });
  }
  return material;
}

let uniforms;
const material = getMaterial(u => uniforms = u);
const mesh     = initMesh(material);
mesh.onBeforeRender = (renderer, scene, camera, geometry, material, group) => {
  if(!uniforms) renderer.compile(scene, camera);
  uniforms.time.value = performance.now() / 1000;
}