Usually for cases like this I would create a factory to avoid the ambiguity, something like:
type Vaccine = "pfizer" | "moderna" type Patient = { name: string; } type PatientWithCoronaVaccineDetails = Patient & { vaccine: Vaccine; doses: number; } function vaccineFactoryForPatient(patient: PatientWithCoronaVaccineDetails) { // ... return { giveFirstDoseOfVaccine() { // ... }, giveSecondDoseOfVaccine() { // ... } } } }
This way we can avoid this category of issues in the first place.
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Usually for cases like this I would create a factory to avoid the ambiguity, something like:
This way we can avoid this category of issues in the first place.