OptionalequalCustom function to compare two values, that should return true if they are equal.
It is called when setting a new value to avoid doing anything (such as notifying subscribers) if the value did not change.
true if a and b are considered equal.
OptionalnotCustom function to compare two values, that should return true if they are different.
It is called when setting a new value to avoid doing anything (such as notifying subscribers) if the value did not change.
true if a and b are considered different.
The default logic (when this option is not present) is to return true
if a is a function or an object, or if a and b are different
according to Object.is.
StoreOptions.equal takes precedence over notEqual if both are defined.
Use StoreOptions.equal instead
OptionalonA function that is called when the number of subscribers changes from 0 to 1 (but not called when the number of subscribers changes from 1 to 2, ...). If it returns a function, that function will be called when the number of subscribers changes from 1 to 0.
Store options that can be passed to readable or writable.