The capacities of glslify are the following:

#pragma glslify: topDot = require(./my-function.glsl)

It allows for the import of a named function from another class. This likely works in a recursive fashion.

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• It does not allow for inline javascript execution.
• It does not output JS modules.
• It does not support tree shaking?

One could create a tagged template literal function for threeify:

glsl`vec3 dot( vec3 a, vec3 b ) { return a . b ; }`