dynamic/value-id.js

"use strict";

// This generates stable (for the lifetime of the process) identifiers for individual values, by identity - it's useful for correlating together eg. debug logs where pretty-printing the full values is impractical
// FIXME: Move this out into its own dedicated package

const nanoid = require("nanoid/non-secure").customAlphabet("1234567890abcdefghklmpqrsvxyz", 6);

let knownValues = new WeakMap();

module.exports = function valueID(value) {
	if (value == null) {
		return value;
	} else {
		if (!knownValues.has(value)) {
			knownValues.set(value, nanoid());
		}

		return knownValues.get(value);
	}
};