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Add builtin sublevels ✨ #8

Merged
merged 5 commits into from
Jan 2, 2022
Merged

Add builtin sublevels ✨ #8

merged 5 commits into from
Jan 2, 2022

Commits on Jan 2, 2022

  1. Add builtin sublevels ✨ 

    Adds a `db.sublevel(name[, options]`) method that works the same as
`subleveldown` except it returns an `abstract-level` database instead
of a `levelup` database. Data-wise there's no change, so an
`abstract-level` sublevel can read sublevels previously created with
(and populated by) `subleveldown`.

Uses code and tests from `subleveldown`. Where possible, I converted
functional tests (against a `memdown` db) to unit tests (against a
mocked database). The abstract test suite also repeats itself, to run
both on a regular database, and a sublevel of the database.

Comes with some new features compared to `subleveldown`:

- `db.batch(..)` takes a `sublevel` option on operations, to atomically
  commit data to multiple sublevels
- Sublevels support Uint8Array in addition to Buffer
- `AbstractLevel#_sublevel()` can be overridden to add additional
  methods to sublevels.
    @vweevers
    vweevers committed Jan 2, 2022
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  2. Bump level-supports and remove unused manifest properties

    @vweevers
    vweevers committed Jan 2, 2022
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  3. Freeze default options to prevent mutation

    @vweevers
    vweevers committed Jan 2, 2022
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  4. Improve README.md and UPGRADING.md 

    - Add links to modules
- Replace references to `leveldown` (etc) with `classic-level` (etc)
- Add more code examples
- Document lack of constructor callback (compared to `levelup`)
- Split encodings guide into consumers and implementors sections
- Describe idempotent open in more detail
- Describe passive open
- Document that `open()` options must be accepted by constructor too
- Describe `level@7` vs `level@8`.
    @vweevers
    vweevers committed Jan 2, 2022
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  5. Bump devDependencies

    @vweevers
    vweevers committed Jan 2, 2022
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