isAssignableFrom method

Implementation

bool isAssignableFrom(ResolvableType other, bool strict, Map<Type, Type>? matchedBefore, bool upUntilUnresolvable) {
  // If we cannot resolve types, we are not assignable
  if (this == NONE || other == NONE) {
    return false;
  }

  if (matchedBefore != null && matchedBefore[_type] == other._type) {
    return true;
  }

  if (upUntilUnresolvable && (other._isUnresolvableTypeVariable() || other._isDynamicType())) {
    return true;
  }

  // Deal with array by delegating to the component type
  if (isArray()) {
    return other.isArray() &&
           getComponentType().isAssignableFrom(other.getComponentType(), true, matchedBefore, upUntilUnresolvable);
  }

  // Main assignability check
  final ourResolved = resolve();
  final otherResolved = other.resolve();

  if (ourResolved == null || otherResolved == null) {
    return false;
  }

  if (strict) {
    return ourResolved.getType() == otherResolved.getType();
  } else {
    return ourResolved.isAssignableFrom(otherResolved);
  }
}