How to tell what dependencies I need for custom loading?

[GreenImp]

Hi,

I'm looking at custom loading to reduce the bundle size, as explained here:

• https://mathjs.org/docs/custom_bundling.html#using-just-a-few-functions
• https://mathjs.org/examples/advanced/custom_evaluate_using_import.js.html

However, I'm struggling to figure out which dependencies I need to include.
I'm only using the Math.evaluate() method in my code, but it obviously calls other method in the background.

I first tried this:

import { create, evaluateDependencies } from 'mathjs/lib/esm/number';

const math = create({ evaluateDependencies });

But my tests then failed for missing dependencies. I went through, one by one, adding dependencies until my tests passed, but now I have a long list of them, and I'm not sure if I might have missed anything, or included too much.

This is what I've currently got:

import {
  create,
  addDependencies,
  ceilDependencies,
  divideDependencies,
  evaluateDependencies,
  floorDependencies,
  maxDependencies,
  minDependencies,
  modDependencies,
  multiplyDependencies,
  powDependencies,
  subtractDependencies,
  unaryMinusDependencies,
} from 'mathjs/lib/esm/number';

const math = create({
  addDependencies,
  ceilDependencies,
  divideDependencies,
  evaluateDependencies,
  floorDependencies,
  maxDependencies,
  minDependencies,
  modDependencies,
  multiplyDependencies,
  powDependencies,
  subtractDependencies,
  unaryMinusDependencies,
});

Is there any way of telling if I've missed any dependencies which my tests may have missed, and how do I know which dependencies I need for the evaluate() method? Does it depend on what notation I'm trying to evaluate?

For reference, I did find this ticket; #2229
But, although it solved the issue for the OP, it didn't really clarify how to figure it out.

Cheers

[josdejong]

That is an interesting one. The parser has a set of operators that it supports like + and *, and these operators map to a function like add and multiply. This is not a dependency right now but maybe it would be better to have that as an explicit dependency.

You can find a list with all supported operators in the docs. However that list does not contain the corresponding function names. It maybe easiest to look inside src/expression/parse.js, search for all occurrences of new OperatorNode(...), and list the function names of all operators from there.

Besides that, the expression parser can evaluate functions like sqrt(4) and also constants like in sin(pi/2), but only if sqrt, sin, and pi are defined.