Narrowing template literals

[hallow compass]

Can I narrow this type with template literal, to remove ${number} from the type?

[marsh kindle]

drwarpman#0

Playground Link

Preview:```ts
const LOG_LEVEL = {
ERROR: 0,
WARN: 1,
INFO: 2,
}

const createLogger = (
logLevel: keyof typeof LOG_LEVEL | ${number}
) => {
let level: keyof typeof LOG_LEVEL

if (logLevel in LOG_LEVEL) {
level = logLevel // throws error
}
...```

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[unreal sundial]

you can do this but it might not be very satisfying:

[marsh kindle]

mkantor#0

Playground Link

Preview:ts ... if ( logLevel === "ERROR" || logLevel === "WARN" || logLevel === "INFO" ) { level = logLevel } ...

[unreal sundial]

i don't think you can directly check for ```${number}` `` to rule out that possibility, at least not without writing a custom type guard