ivory spear
hey! i'm almost certain this is 100% impossible, but i'd like to ask anyway. say i have a string with "templates" defined like {{TEMPLATE_NAME}}. is it possible to write a function with types regarding the templates included in the string? for example:
doSomething("Hello, {{NAME}}", {
// right here, there would be a property called "name" or "{{NAME}}" or something
});```
again, almost certain this is not possible, but would love to be proven wrongoh no way its actually possible
give me a minute
type ExtractPlaceholders<T extends string> = T extends `${infer _Start}{{${infer Placeholder}}}${infer Rest}`
? Placeholder | ExtractPlaceholders<Rest>
: never;
type CreateObjectType<T extends string> = {
[K in ExtractPlaceholders<T> as Lowercase<K>]: string
};
type ExampleString = "Hello, {{NAME}}, you are {{AGE}} years old.";
type ResultType = CreateObjectType<ExampleString>;```
TS has come a long way. this is mental
stoic bane
```ts
type ExtractPlaceholders<T extends string> = T extends `${infer _Start}{{$...
Some small improvements:
infer _Start can be replaced with string.CreateObjectType can be simplified to:type CreateObjectType<T extends string> = Record<Lowercase<ExtractPlaceholders<T>>, string>
this code was generated by llama3:8b lol