function updateFilterData(
mode: 'PaymentType' | 'Origin' | 'Destination',
value: string,
) {
}
I need to modify this function so that when mode is 'Origin' | 'Destination', the value should be a string. If the mode is PaymentType, then the value should be either 'Payment in' or 'Payment out'.
It appears to be a case of function overloading.
function handleAddFilter(
mode: 'Destination' | 'Origin',
value: string,
)
function handleAddFilter(
mode: 'PaymentType',
value:'Payment in' | 'Payment out',
)
Here are some theories about function overloading:
If you combine the two function arguments into a single object-type argument, you can then create two distinct types to handle your specific use cases separately.
type TypeA = {
mode: 'Origin' | 'Destination';
value: string;
};
type TypeB = {
mode: 'PaymentType';
value: 'Payment in' | 'Payment out';
};
function applyFilter(input: TypeA | TypeB) {}
applyFilter({
mode: 'Destination',
value: 'xyz789',
});
applyFilter({
mode: 'PaymentType',
value: 'Payment out', // Allows for full type checking
});
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