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To answer the first question "learn JS or TS" the answer has to be JS then TS. Nowadays to become a professional web application developer you need both. You first need a firm foundation in JS before adopting TS. After all, the web browser and Node do not understand TS (unlike Deno). When debugging code, you might have access to source maps that link the obfuscated JS code to the TS instructions but sometimes to need to delve deep into the JS and get as close to the JS processor as possible to discover the root cause of issues.
To answer the first question "learn JS or TS" the answer has to be JS then TS. Nowadays to become a professional web application developer you need both. You first need a firm foundation in JS before adopting TS. After all, the web browser and Node do not understand TS (unlike Deno). When debugging code, you might have access to source maps that link the obfuscated JS code to the TS instructions but sometimes to need to delve deep into the JS and get as close to the JS processor as possible to discover the root cause of issues.
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