0.4.0 no more SUB and consistent behavior

Breaking changes

Removed SUB export, same behavior can be achieved using a function:

// before
merge({ nested: { deep: true } }, { nested: SUB({ replaced: true }) })
// now
merge({ nested: { deep: true } }, { nested: () => ({ replaced: true }) })

Top level function patches will no longer merge in order to be consistent with lower level function patches. The merge function is now passed as the second arg to function patches to allow merging without needing to import anything.

Example:

merge(
  {
    person: { name: 'bob' }
  },
  {
    person: (obj, merge) =>
      merge(obj, {
        name_backwards: obj.name
          .split('')
          .reverse()
          .join('')
      })
  }
)

0.3.0 bye bye DEL/SUB, hello (x => x) and undefined

This versions contains breaking changes:

DEL is no longer exported, specify undefined as the value to delete properties, use null if you don't want to delete

// before
merge({ prop: true }, { prop: DEL })

// now
merge({ prop: true }, { prop: undefined })

SUB is only used to perform replacements and sidestep recursive logic, directly set a function as the value in order to perform a function substitution

// before
merge({ count: 1, nest: { foo: 'bar' } }, { count: SUB(x => x + 1), nest: SUB({}) }

// now
merge({ count: 1, nest: { foo: 'bar' } }, { count: x => x + 1, nest: SUB({}) }

This release also contains 1 bug fix. Previously SUB operations nested into a path that didn't exist in the source object would be copied in unresolved, leaving mergerino artifacts in state. This has been fixed.