Webgl Extension methods get renamed when required as glslify module

[kevzettler]

I have a frag shader that is dependant on the GL_OES_standard_derivatives extension

#extension GL_OES_standard_derivatives : enable
precision mediump float;
#pragma glslify: grid = require(glsl-solid-wireframe/barycentric/scaled)
varying vec2 b;
void main () {
  gl_FragColor = vec4(vec3(grid(b, 1.0)), 1);
}

When compiled through glslify the ouput looks like

"#extension GL_OES_standard_derivatives : enable
precision mediump float;
#define GLSLIFY 1
float gridFactor_1_0 (vec2 vBC_1_1, float width_1_2, float feather_1_3) {
  float w1 = width_1_2 - feather_1_3 * 0.5;
  vec3 bary = vec3(vBC_1_1.x, vBC_1_1.y, 1.0 - vBC_1_1.x - vBC_1_1.y);
  vec3 d = fwidth_1_4(bary);
  vec3 a3 = smoothstep(d * w1, d * (w1 + feather_1_3), bary);
  return min(min(a3.x, a3.y), a3.z);
}

float gridFactor_1_0 (vec2 vBC_1_1, float width_1_2) {
  vec3 bary = vec3(vBC_1_1.x, vBC_1_1.y, 1.0 - vBC_1_1.x - vBC_1_1.y);
  vec3 d = fwidth_1_4(bary);
  vec3 a3 = smoothstep(d * (width_1_2 - 0.5), d * (width_1_2 + 0.5), bary);
  return min(min(a3.x, a3.y), a3.z);
}

varying vec2 b;
void main () {
  gl_FragColor = vec4(vec3(gridFactor_1_0(b, 1.0)), 1);
}

The problem here is the GL_OES_standard_derivatives extension includes a fwidth function. glslify namepaces this as fwidth_1_4 which dosen't exist. The shader then fails to compile. I'm not sure if this is related to #46