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james-mcelwain
on Sept 28, 2020
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Show HN: A SQL database implemented purely in Type...
No, TypeScript is compile time only. There's no runtime type info.
whatshisface
on Sept 28, 2020
[–]
The 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
on Sept 28, 2020
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Not 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 ..."
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