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Why would I want to write JavaScript that targets WASM?
Because you want to use JavaScript in the browser.
/satire off
😉
Code obfuscation and proprietary code.
Because that way you can use it wherever something accepts WASM. In particular, as mentioned in the linked article, Javy started its life as a way for you to submit code to Shopify Functions in JavaScript, as Shopify Functions lets you submit code as WASM so that you can program in whatever language you prefer.
Why would one choose JavaScript in this circumstance?