Possible alternate Mesh sheet structure. Minimal boilerplate, with auto-caching (albeit shallow) of calcs, and optimised for diff readability.

alt_mesh_structure.js

const ROOT = [
    ['hello', [1, 1], $ => `world`],
    ['calc', [0, 0], $ => $['hello']],
].reduce((o,[k,g,v]) => Object.defineProperty(o, k, {
    get: () => {
        console.log('Recording', k);
        delete o[k];
        return o[k]=v(o)
    },
    configurable:true
}), {})

console.log(ROOT['calc']);
// Won't see 'recording' show up in console for second access
console.log(ROOT['calc']);

// Could use as a template via below (before sheet props are accessed):
// Object.defineProperties(ROOT, {hello: {value: `planet`}});

/* Condenses to:
const ROOT = [
    ['hello', [1, 1], $ => `world`],
    ['calc', [0, 0], $ => $['hello']],
].reduce((o,[k,g,v])=>Object.defineProperty(o,k,{get:()=>{
delete o[k];return o[k]=v(o)},configurable:true}),{})
*/

// Could we condense via Object.defineProperties?
// Can we avoid Object.[anything] by getting calc solve order another way?