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You can still write JS or TypeScript code that tries its best to keep memory use under check. JavaScript was around in the late 90s when the memory footprint of software was at least an order of magnitude lower, so it's absolutely doable.

JavaScript in the late 90s was doing a hell of a lot less than it is today.

You don't have to go that deep. 99% of the time our analytics or risk management teams have some really memory inefficient Python and they want me to write them one of our "magic C things" it turns out to be fixable by replacing their in-memory iterations with a generator.

Most people don't have the chance to do that, but hopefully we can see some other languages get first class access on the web. At least there is the whole WASM project.