Known Limitations

Type Inference

This library's type hints do not work with mypy, but they do work relatively well with pyright.

Methods on Mutable Collection

When working with collections like lists, methods that mutate the underlying object don't trigger signified to notify observers:

from signified import Signal

# This won't work as expected
numbers = Signal([1, 2, 3])
sum_numbers = computed(sum)(numbers)
print(sum_numbers.value)  # 6

numbers.value.append(4)   # Mutation doesn't trigger update
print(sum_numbers.value)  # Still 6, not 10 as expected

# Instead, do one of these:
# 1. Assign a new list
numbers.value = [1, 2, 3, 4]
print(sum_numbers.value)  # 10

# 2. Create a new list with the existing values
numbers.value = numbers.value + [4]
print(sum_numbers.value) # 10