[tfjs-node] replace deprecated utils

[tharvik]

after been marked as deprecated in node 22, node 23 removed nearly all its util.is* functions. so using the node backend in 23 fails quite loudly with some "TypeError: util_1.isNullOrUndefined is not a function".

this PR replace the few places where theses functions were used with node's recommended fixes. or with nullish-coalescing where appropriate.

[andresribeiro]

+1

[Ananthusubramanian]

+1

[domdomegg]

@mattsoulanille can you review this? The fix looks correct and it blocks being able to use tfjs-node on Node >=23.

[mrddter]

any news on this?

[barroudjo]

Same thing, on node 23 (and above) this is absolutely needed. Is there a reason for it not being merged ?

[bubbatls]

+1
Please

[mattsoulanille]

Thanks! We're currently changing our CI config, so I've run this locally to verify it passes.

[chr4ss12]

why is this still not released?

Added this to my project:

// nice hack to support tensorflow,
// in future tensorflow package upgrade should not need these functions anymore.
// #8425
const util = require('util');
if (!util.isNullOrUndefined) {
util.isNullOrUndefined = (val: any): val is null | undefined => {
return val === null || val === undefined;
};
}

if (!util.isArray) {
util.isArray = (val: any): val is any[] => {
return Array.isArray(val);
};
}