Why I can't do this: ${someValue} in JavaScript / Typescript? [duplicate]

You write single quotes, which doesn't have interpolation capability.

Please try "backtick" char, which will solve your issue

`Hello ${a}`

You can read more about this here:

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Template_literals

Only works with backticks, not quotes.

Do `Hello ${a}` instead of 'Hello ${a}'

whenever you want to use template string, you have to wrap up with the backtick (type alt + 96), the correct syntax is:

`string ${YOUR_VARIABLE} string`

read this document: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Template_literals

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