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But if you declare a string literal as const, then the string runtime value will match the string type. So it would be possible to have a runtime result (that e
by ricksharp 6y ago
But if you declare a string literal as const, then the string runtime value will match the string type. So it would be possible to have a runtime result (that executes an actual db query for example) that is paired with the type result.
- james-mcelwain 6y agoNo, TypeScript is compile time only. There's no runtime type info.
- whatshisface 6y agoThe parent comment is saying that if you write the string twice, you can get the compiler to check #1 and the runtime to use #2.
- ricksharp 6y agoNot exactly (there is no duplication), a string constant in typescript is it's own type: const sql = 'SELECT ...'; type SQL = typeof sql; // type SQL = "SELECT ..."