function getAtom()

in packages/recoil/recoil_values/Recoil_atom.js [481:515]
28 lines of code
7 McCabe index (conditional complexity)

  function getAtom(_store: Store, state: TreeState): Loadable<T> {
    if (state.atomValues.has(key)) {
      // Atom value is stored in state:
      return nullthrows(state.atomValues.get(key));
    } else if (state.nonvalidatedAtoms.has(key)) {
      // Atom value is stored but needs validation before use.
      // We might have already validated it and have a cached validated value:
      if (cachedAnswerForUnvalidatedValue != null) {
        return cachedAnswerForUnvalidatedValue;
      }

      if (persistence == null) {
        expectationViolation(
          `Tried to restore a persisted value for atom ${key} but it has no persistence settings.`,
        );
        return defaultLoadable;
      }
      const nonvalidatedValue = state.nonvalidatedAtoms.get(key);
      const validatorResult: T | DefaultValue = persistence.validator(
        nonvalidatedValue,
        DEFAULT_VALUE,
      );

      const validatedValueLoadable =
        validatorResult instanceof DefaultValue
          ? defaultLoadable
          : loadableWithValue(validatorResult);

      cachedAnswerForUnvalidatedValue = validatedValueLoadable;

      return cachedAnswerForUnvalidatedValue;
    } else {
      return defaultLoadable;
    }
  }