subleveldown - npm Package Compare versions

Comparing version 5.0.1 to 6.0.0

CHANGELOG.md

 # Changelog
 
-_**If you are upgrading:** please see [`UPGRADING.md`](UPGRADING.md)._
+## [6.0.0] - 2021-10-01
 
+_If you are upgrading: please see [`UPGRADING.md`](UPGRADING.md)._
+
+### Changed
+
+- **Breaking:** bump `abstract-leveldown`, `encoding-down`, `levelup` ([`60bd660`](https://github.com/Level/subleveldown/commit/60bd660)) (Vincent Weevers)
+- **Breaking:** hide private properties with Symbol ([`1f9d550`](https://github.com/Level/subleveldown/commit/1f9d550)) (Vincent Weevers)
+- Refactor: use `addRestOptions()` for iterator ([`717066e`](https://github.com/Level/subleveldown/commit/717066e)) (Vincent Weevers)
+- Modernize syntax and bump standard ([`0bd41cc`](https://github.com/Level/subleveldown/commit/0bd41cc)) (Vincent Weevers)
+
+### Added
+
+- Add `db.getMany(keys)` ([#107](https://github.com/Level/subleveldown/issues/107)) ([`0ff2b68`](https://github.com/Level/subleveldown/commit/0ff2b68)) (Vincent Weevers)
+- Add manifest ([Level/community#83](https://github.com/Level/community/issues/83)) ([`f7ee1e3`](https://github.com/Level/subleveldown/commit/f7ee1e3)) (Vincent Weevers)
+- Clarify scope of keys in README examples ([`58a628a`](https://github.com/Level/subleveldown/commit/58a628a)) (Vincent Weevers)
+
+### Removed
+
+- **Breaking:** drop Node.js 6 and 8 ([`ab713d1`](https://github.com/Level/subleveldown/commit/ab713d1)) (Vincent Weevers).
+
 ## [5.0.1] - 2020-06-26
@@ -9,18 +28,20 @@
 
-- Run `abstract-leveldown` tests on `levelup` interface ([#90](https://github.com/level/subleveldown/issues/90)) ([`8928189`](https://github.com/level/subleveldown/commit/8928189)) ([**@vweevers**](https://github.com/vweevers))
+- Run `abstract-leveldown` tests on `levelup` interface ([#90](https://github.com/Level/subleveldown/issues/90)) ([`8928189`](https://github.com/Level/subleveldown/commit/8928189)) ([**@vweevers**](https://github.com/vweevers))
 
 ### Fixed
 
-- Don't mutate arguments object, which fails in strict mode ([#93](https://github.com/level/subleveldown/issues/93)) ([`5513c83`](https://github.com/level/subleveldown/commit/5513c83)) ([**@andymatuschak**](https://github.com/andymatuschak))
+- Don't mutate arguments object, which fails in strict mode ([#93](https://github.com/Level/subleveldown/issues/93)) ([`5513c83`](https://github.com/Level/subleveldown/commit/5513c83)) ([**@andymatuschak**](https://github.com/andymatuschak))
 
 ## [5.0.0] - 2020-04-05
 
+_If you are upgrading: please see [`UPGRADING.md`](UPGRADING.md)._
+
 ### Changed
 
-- **Breaking:** parent db must support deferredOpen ([#89](https://github.com/level/subleveldown/issues/89)) ([**@vweevers**](https://github.com/vweevers))
-- Upgrade `dependency-check` devDependency from `^3.3.0` to `^4.1.0` ([`b47f991`](https://github.com/level/subleveldown/commit/b47f991)) ([**@vweevers**](https://github.com/vweevers))
+- **Breaking:** parent db must support deferredOpen ([#89](https://github.com/Level/subleveldown/issues/89)) ([**@vweevers**](https://github.com/vweevers))
+- Upgrade `dependency-check` devDependency from `^3.3.0` to `^4.1.0` ([`b47f991`](https://github.com/Level/subleveldown/commit/b47f991)) ([**@vweevers**](https://github.com/vweevers))
 
 ### Fixed
 
-- **Breaking:** fix iterating buffer keys that contain bytes 196-255 ([#88](https://github.com/level/subleveldown/issues/88)) ([**@vweevers**](https://github.com/vweevers))
+- **Breaking:** fix iterating buffer keys that contain bytes 196-255 ([#88](https://github.com/Level/subleveldown/issues/88)) ([**@vweevers**](https://github.com/vweevers))
 
@@ -31,4 +52,4 @@ ## [4.1.4] - 2019-10-08
 
-- Fix double prefixes ([#81](https://github.com/level/subleveldown/issues/81)) ([**@vweevers**](https://github.com/vweevers))
-- Fix `open()` test ([#80](https://github.com/level/subleveldown/issues/80)) ([**@vweevers**](https://github.com/vweevers))
+- Fix double prefixes ([#81](https://github.com/Level/subleveldown/issues/81)) ([**@vweevers**](https://github.com/vweevers))
+- Fix `open()` test ([#80](https://github.com/Level/subleveldown/issues/80)) ([**@vweevers**](https://github.com/vweevers))
 
@@ -39,3 +60,3 @@ ## [4.1.3] - 2019-09-17
 
-- Use `reachdown` package ([Level/community#82](https://github.com/Level/community/issues/82)) ([#75](https://github.com/level/subleveldown/issues/75)) ([**@vweevers**](https://github.com/vweevers))
+- Use `reachdown` package ([Level/community#82](https://github.com/Level/community/issues/82)) ([#75](https://github.com/Level/subleveldown/issues/75)) ([**@vweevers**](https://github.com/vweevers))
 
@@ -46,12 +67,12 @@ ## [4.1.2] - 2019-09-12
 
-- Upgrade `standard` devDependency from `^13.0.1` to `^14.0.0` ([#71](https://github.com/level/subleveldown/issues/71)) ([**@vweevers**](https://github.com/vweevers))
-- Upgrade `hallmark` devDependency from `^1.0.0` to `^2.0.0` ([#72](https://github.com/level/subleveldown/issues/72)) ([**@vweevers**](https://github.com/vweevers))
+- Upgrade `standard` devDependency from `^13.0.1` to `^14.0.0` ([#71](https://github.com/Level/subleveldown/issues/71)) ([**@vweevers**](https://github.com/vweevers))
+- Upgrade `hallmark` devDependency from `^1.0.0` to `^2.0.0` ([#72](https://github.com/Level/subleveldown/issues/72)) ([**@vweevers**](https://github.com/vweevers))
 
 ### Removed
 
-- Remove outdated `example.js` ([`3ef72c9`](https://github.com/level/subleveldown/commit/3ef72c9)) ([**@vweevers**](https://github.com/vweevers))
+- Remove outdated `example.js` ([`3ef72c9`](https://github.com/Level/subleveldown/commit/3ef72c9)) ([**@vweevers**](https://github.com/vweevers))
 
 ### Fixed
 
-- Polish `clear()` ([#74](https://github.com/level/subleveldown/issues/74)) ([**@vweevers**](https://github.com/vweevers))
+- Polish `clear()` ([#74](https://github.com/Level/subleveldown/issues/74)) ([**@vweevers**](https://github.com/vweevers))
   - Bump `levelup`, `abstract-leveldown` and `encoding-down` to prevent dedupe
@@ -65,9 +86,9 @@ - Opt-in to new `clear()` tests
 
-- Upgrade `memdown` devDependency from `^4.0.0` to `^5.0.0` ([#70](https://github.com/level/subleveldown/issues/70)) ([**@vweevers**](https://github.com/vweevers))
-- Upgrade `hallmark` devDependency from `^0.1.0` to `^1.0.0` ([#68](https://github.com/level/subleveldown/issues/68)) ([**@vweevers**](https://github.com/vweevers))
-- Upgrade `standard` devDependency from `^12.0.1` to `^13.0.1` ([#67](https://github.com/level/subleveldown/issues/67)) ([**@vweevers**](https://github.com/vweevers))
+- Upgrade `memdown` devDependency from `^4.0.0` to `^5.0.0` ([#70](https://github.com/Level/subleveldown/issues/70)) ([**@vweevers**](https://github.com/vweevers))
+- Upgrade `hallmark` devDependency from `^0.1.0` to `^1.0.0` ([#68](https://github.com/Level/subleveldown/issues/68)) ([**@vweevers**](https://github.com/vweevers))
+- Upgrade `standard` devDependency from `^12.0.1` to `^13.0.1` ([#67](https://github.com/Level/subleveldown/issues/67)) ([**@vweevers**](https://github.com/vweevers))
 
 ### Fixed
 
-- Relax `isAbstract()` check ([`fbbf525`](https://github.com/level/subleveldown/commit/fbbf525)) ([**@vweevers**](https://github.com/vweevers))
+- Relax `isAbstract()` check ([`fbbf525`](https://github.com/Level/subleveldown/commit/fbbf525)) ([**@vweevers**](https://github.com/vweevers))
 
@@ -78,37 +99,39 @@ ## [4.1.0] - 2019-06-28
 
-- Upgrade `nyc` devDependency from `^13.3.0` to `^14.0.0` ([#63](https://github.com/level/subleveldown/issues/63)) ([**@vweevers**](https://github.com/vweevers))
+- Upgrade `nyc` devDependency from `^13.3.0` to `^14.0.0` ([#63](https://github.com/Level/subleveldown/issues/63)) ([**@vweevers**](https://github.com/vweevers))
 
 ### Added
 
-- Support seeking ([#66](https://github.com/level/subleveldown/issues/66)) ([**@MeirionHughes**](https://github.com/MeirionHughes))
+- Support seeking ([#66](https://github.com/Level/subleveldown/issues/66)) ([**@MeirionHughes**](https://github.com/MeirionHughes))
 
 ## [4.0.0] - 2019-04-06
 
+_If you are upgrading: please see [`UPGRADING.md`](UPGRADING.md)._
+
 ### Changed
 
-- Upgrade `abstract-leveldown` from `^5.0.0` to `^6.0.2` ([#61](https://github.com/level/subleveldown/issues/61)) ([**@vweevers**](https://github.com/vweevers))
-- Upgrade `encoding-down` from `^5.0.3` to `^6.0.1` ([#61](https://github.com/level/subleveldown/issues/61)) ([**@vweevers**](https://github.com/vweevers))
-- Upgrade `levelup` from `^3.0.1` to `^4.0.1` ([#61](https://github.com/level/subleveldown/issues/61)) ([**@vweevers**](https://github.com/vweevers))
-- Avoid unnecessary copy of batch operations ([#61](https://github.com/level/subleveldown/issues/61)) ([**@vweevers**](https://github.com/vweevers))
-- Invoke abstract tests from single function ([#61](https://github.com/level/subleveldown/issues/61)) ([**@vweevers**](https://github.com/vweevers))
-- Add mandatory `db` argument to abstract iterator ([#61](https://github.com/level/subleveldown/issues/61)) ([**@vweevers**](https://github.com/vweevers))
-- Upgrade `memdown` devDependency from `^3.0.0` to `^4.0.0` ([#61](https://github.com/level/subleveldown/issues/61)) ([**@vweevers**](https://github.com/vweevers))
-- Upgrade `nyc` devDependency from `^12.0.2` to `^13.3.0` ([#61](https://github.com/level/subleveldown/issues/61)) ([**@vweevers**](https://github.com/vweevers))
-- Upgrade `standard` devDependency from `^11.0.1` to `^12.0.1` ([#61](https://github.com/level/subleveldown/issues/61)) ([**@vweevers**](https://github.com/vweevers))
-- Apply common project tweaks ([#58](https://github.com/level/subleveldown/issues/58), [#59](https://github.com/level/subleveldown/issues/59)) ([**@vweevers**](https://github.com/vweevers))
+- Upgrade `abstract-leveldown` from `^5.0.0` to `^6.0.2` ([#61](https://github.com/Level/subleveldown/issues/61)) ([**@vweevers**](https://github.com/vweevers))
+- Upgrade `encoding-down` from `^5.0.3` to `^6.0.1` ([#61](https://github.com/Level/subleveldown/issues/61)) ([**@vweevers**](https://github.com/vweevers))
+- Upgrade `levelup` from `^3.0.1` to `^4.0.1` ([#61](https://github.com/Level/subleveldown/issues/61)) ([**@vweevers**](https://github.com/vweevers))
+- Avoid unnecessary copy of batch operations ([#61](https://github.com/Level/subleveldown/issues/61)) ([**@vweevers**](https://github.com/vweevers))
+- Invoke abstract tests from single function ([#61](https://github.com/Level/subleveldown/issues/61)) ([**@vweevers**](https://github.com/vweevers))
+- Add mandatory `db` argument to abstract iterator ([#61](https://github.com/Level/subleveldown/issues/61)) ([**@vweevers**](https://github.com/vweevers))
+- Upgrade `memdown` devDependency from `^3.0.0` to `^4.0.0` ([#61](https://github.com/Level/subleveldown/issues/61)) ([**@vweevers**](https://github.com/vweevers))
+- Upgrade `nyc` devDependency from `^12.0.2` to `^13.3.0` ([#61](https://github.com/Level/subleveldown/issues/61)) ([**@vweevers**](https://github.com/vweevers))
+- Upgrade `standard` devDependency from `^11.0.1` to `^12.0.1` ([#61](https://github.com/Level/subleveldown/issues/61)) ([**@vweevers**](https://github.com/vweevers))
+- Apply common project tweaks ([#58](https://github.com/Level/subleveldown/issues/58), [#59](https://github.com/Level/subleveldown/issues/59)) ([**@vweevers**](https://github.com/vweevers))
 
 ### Added
 
-- Test that errors from `open()` and iterators bubble up ([#61](https://github.com/level/subleveldown/issues/61)) ([**@vweevers**](https://github.com/vweevers))
-- Test without a user-provided `levelup` layer ([#61](https://github.com/level/subleveldown/issues/61)) ([**@vweevers**](https://github.com/vweevers))
-- Gitignore `coverage` directory ([#61](https://github.com/level/subleveldown/issues/61)) ([**@vweevers**](https://github.com/vweevers))
+- Test that errors from `open()` and iterators bubble up ([#61](https://github.com/Level/subleveldown/issues/61)) ([**@vweevers**](https://github.com/vweevers))
+- Test without a user-provided `levelup` layer ([#61](https://github.com/Level/subleveldown/issues/61)) ([**@vweevers**](https://github.com/vweevers))
+- Gitignore `coverage` directory ([#61](https://github.com/Level/subleveldown/issues/61)) ([**@vweevers**](https://github.com/vweevers))
 
 ### Removed
 
-- Remove obsolete `_batch()` checks ([#61](https://github.com/level/subleveldown/issues/61)) ([**@vweevers**](https://github.com/vweevers))
-- Remove dummy location from `abstract-leveldown` constructor call ([#61](https://github.com/level/subleveldown/issues/61)) ([**@vweevers**](https://github.com/vweevers))
+- Remove obsolete `_batch()` checks ([#61](https://github.com/Level/subleveldown/issues/61)) ([**@vweevers**](https://github.com/vweevers))
+- Remove dummy location from `abstract-leveldown` constructor call ([#61](https://github.com/Level/subleveldown/issues/61)) ([**@vweevers**](https://github.com/vweevers))
 
 ### Fixed
 
-- Serialize non-buffer keys to strings ([#61](https://github.com/level/subleveldown/issues/61)) ([**@vweevers**](https://github.com/vweevers))
+- Serialize non-buffer keys to strings ([#61](https://github.com/Level/subleveldown/issues/61)) ([**@vweevers**](https://github.com/vweevers))
 
@@ -131,2 +154,4 @@ ## [3.0.1] - 2018-07-27
 
+_If you are upgrading: please see [`UPGRADING.md`](UPGRADING.md)._
+
 ### Added
@@ -255,44 +280,48 @@
 
-## 1.0.0 - 2014-12-23
+## [1.0.0] - 2014-12-23
 
 :seedling: Initial release.
 
-[5.0.1]: https://github.com/level/subleveldown/compare/v5.0.0...v5.0.1
+[6.0.0]: https://github.com/Level/subleveldown/releases/tag/v6.0.0
 
-[5.0.0]: https://github.com/level/subleveldown/compare/v4.1.4...v5.0.0
+[5.0.1]: https://github.com/Level/subleveldown/releases/tag/v5.0.1
 
-[4.1.4]: https://github.com/level/subleveldown/compare/v4.1.3...v4.1.4
+[5.0.0]: https://github.com/Level/subleveldown/releases/tag/v5.0.0
 
-[4.1.3]: https://github.com/level/subleveldown/compare/v4.1.2...v4.1.3
+[4.1.4]: https://github.com/Level/subleveldown/releases/tag/v4.1.4
 
-[4.1.2]: https://github.com/level/subleveldown/compare/v4.1.1...v4.1.2
+[4.1.3]: https://github.com/Level/subleveldown/releases/tag/v4.1.3
 
-[4.1.1]: https://github.com/level/subleveldown/compare/v4.1.0...v4.1.1
+[4.1.2]: https://github.com/Level/subleveldown/releases/tag/v4.1.2
 
-[4.1.0]: https://github.com/level/subleveldown/compare/v4.0.0...v4.1.0
+[4.1.1]: https://github.com/Level/subleveldown/releases/tag/v4.1.1
 
-[4.0.0]: https://github.com/level/subleveldown/compare/v3.0.1...v4.0.0
+[4.1.0]: https://github.com/Level/subleveldown/releases/tag/v4.1.0
 
-[3.0.1]: https://github.com/level/subleveldown/compare/v3.0.0...v3.0.1
+[4.0.0]: https://github.com/Level/subleveldown/releases/tag/v4.0.0
 
-[3.0.0]: https://github.com/level/subleveldown/compare/v3.0.0-rc1...v3.0.0
+[3.0.1]: https://github.com/Level/subleveldown/releases/tag/v3.0.1
 
-[3.0.0-rc1]: https://github.com/level/subleveldown/compare/v2.1.0...v3.0.0-rc1
+[3.0.0]: https://github.com/Level/subleveldown/releases/tag/v3.0.0
 
-[2.1.0]: https://github.com/level/subleveldown/compare/v2.0.0...v2.1.0
+[3.0.0-rc1]: https://github.com/Level/subleveldown/releases/tag/v3.0.0-rc1
 
-[2.0.0]: https://github.com/level/subleveldown/compare/v1.1.0...v2.0.0
+[2.1.0]: https://github.com/Level/subleveldown/releases/tag/v2.1.0
 
-[1.1.0]: https://github.com/level/subleveldown/compare/v1.0.6...v1.1.0
+[2.0.0]: https://github.com/Level/subleveldown/releases/tag/v2.0.0
 
-[1.0.6]: https://github.com/level/subleveldown/compare/v1.0.5...v1.0.6
+[1.1.0]: https://github.com/Level/subleveldown/releases/tag/v1.1.0
 
-[1.0.5]: https://github.com/level/subleveldown/compare/v1.0.4...v1.0.5
+[1.0.6]: https://github.com/Level/subleveldown/releases/tag/v1.0.6
 
-[1.0.4]: https://github.com/level/subleveldown/compare/v1.0.3...v1.0.4
+[1.0.5]: https://github.com/Level/subleveldown/releases/tag/v1.0.5
 
-[1.0.3]: https://github.com/level/subleveldown/compare/v1.0.2...v1.0.3
+[1.0.4]: https://github.com/Level/subleveldown/releases/tag/v1.0.4
 
-[1.0.2]: https://github.com/level/subleveldown/compare/v1.0.1...v1.0.2
+[1.0.3]: https://github.com/Level/subleveldown/releases/tag/v1.0.3
 
-[1.0.1]: https://github.com/level/subleveldown/compare/v1.0.0...v1.0.1
+[1.0.2]: https://github.com/Level/subleveldown/releases/tag/v1.0.2
+
+[1.0.1]: https://github.com/Level/subleveldown/releases/tag/v1.0.1
+
+[1.0.0]: https://github.com/Level/subleveldown/releases/tag/v1.0.0

index.js

@@ -1,5 +0,7 @@
-var subdown = require('./leveldown')
-var levelup = require('levelup')
-var encoding = require('encoding-down')
+'use strict'
 
+const subdown = require('./leveldown')
+const levelup = require('levelup')
+const encoding = require('encoding-down')
+
 module.exports = function (db, prefix, opts) {
@@ -9,3 +11,11 @@ if (typeof prefix === 'object' && !opts) return module.exports(db, null, prefix)
 
-  return levelup(encoding(subdown(db, prefix, opts), opts), opts)
+  const wrapped = levelup(encoding(subdown(db, prefix, opts), opts), opts)
+
+  // Workaround for abstract-leveldown tests that expect db._nextTick
+  // TODO: fix tests or add _nextTick to levelup for API parity
+  if (!wrapped._nextTick) {
+    wrapped._nextTick = subdown.prototype._nextTick
+  }
+
+  return wrapped
 }

leveldown.js

@@ -1,11 +0,18 @@
-var inherits = require('inherits')
-var abstract = require('abstract-leveldown')
-var wrap = require('level-option-wrap')
-var reachdown = require('reachdown')
-var matchdown = require('./matchdown')
+'use strict'
 
-var rangeOptions = 'start end gt gte lt lte'.split(' ')
-var defaultClear = abstract.AbstractLevelDOWN.prototype._clear
-var hasOwnProperty = Object.prototype.hasOwnProperty
+const inherits = require('inherits')
+const abstract = require('abstract-leveldown')
+const wrap = require('level-option-wrap')
+const reachdown = require('reachdown')
+const matchdown = require('./matchdown')
 
+const rangeOptions = ['gt', 'gte', 'lt', 'lte']
+const defaultClear = abstract.AbstractLevelDOWN.prototype._clear
+const hasOwnProperty = Object.prototype.hasOwnProperty
+const nextTick = abstract.AbstractLevelDOWN.prototype._nextTick
+
+const kIterator = Symbol('iterator')
+const kPrefix = Symbol('prefix')
+const kBeforeOpen = Symbol('beforeOpen')
+
 function concat (prefix, key, force) {
@@ -20,4 +27,4 @@ if (typeof key === 'string' && (force || key.length)) return prefix + key
 function SubIterator (db, ite, prefix) {
-  this.iterator = ite
-  this.prefix = prefix
+  this[kIterator] = ite
+  this[kPrefix] = prefix
 
@@ -32,6 +39,5 @@ abstract.AbstractIterator.call(this, db)
 
-  var self = this
-  this.iterator.next(function (err, key, value) {
+  this[kIterator].next((err, key, value) => {
     if (err) return cb(err)
-    if (key) key = key.slice(self.prefix.length)
+    if (key) key = key.slice(this[kPrefix].length)
     cb(err, key, value)
@@ -42,3 +48,3 @@ })
 SubIterator.prototype._seek = function (key) {
-  this.iterator.seek(concat(this.prefix, key))
+  this[kIterator].seek(concat(this[kPrefix], key))
 }
@@ -48,3 +54,3 @@
   if (maybeError(this.db.leveldown, cb)) return
-  this.iterator.end(cb)
+  this[kIterator].end(cb)
 }
@@ -57,3 +63,3 @@
 
-  var separator = opts.separator
+  let separator = opts.separator
 
@@ -65,4 +71,4 @@ if (!prefix) prefix = ''
 
-  var code = separator.charCodeAt(0) + 1
-  var ceiling = String.fromCharCode(code)
+  const code = separator.charCodeAt(0) + 1
+  const ceiling = String.fromCharCode(code)
 
@@ -77,6 +83,5 @@ Buffer.from(prefix).forEach(function (byte) {
   this.prefix = separator + prefix + separator
-  this._beforeOpen = opts.open
+  this[kBeforeOpen] = opts.open
 
-  var self = this
-  var manifest = db.supports || {}
+  let manifest = db.supports || {}
 
@@ -89,3 +94,3 @@ // The parent db must open itself or be (re)opened by the user because a
 
-  var subdb = reachdown(db, 'subleveldown')
+  const subdb = reachdown(db, 'subleveldown')
 
@@ -113,10 +118,10 @@ if (subdb) {
   this._wrap = {
-    gt: function (x) {
-      return concat(self.prefix, x || '', true)
+    gt: (x) => {
+      return concat(this.prefix, x || '', true)
     },
-    lt: function (x) {
+    lt: (x) => {
       if (!x || isEmptyBuffer(x)) {
-        return self.prefix.slice(0, -1) + ceiling
+        return this.prefix.slice(0, -1) + ceiling
       } else {
-        return concat(self.prefix, x)
+        return concat(this.prefix, x)
       }
@@ -126,3 +131,22 @@ }
 
-  abstract.AbstractLevelDOWN.call(this)
+  manifest = {
+    // Inherit manifest from parent db
+    ...manifest,
+
+    // We support this on the levelup interface, but not on the
+    // abstract-leveldown interface.
+    deferredOpen: false,
+
+    // Disable unsupported features
+    keyIterator: false,
+    valueIterator: false,
+    iteratorNextv: false,
+    iteratorAll: false,
+
+    // Unset additional methods (like approximateSize) which we can't support
+    // here and should typically be called on the underlying store instead.
+    additionalMethods: {}
+  }
+
+  abstract.AbstractLevelDOWN.call(this, manifest)
 }
@@ -136,10 +160,17 @@
 // because that means we can always do operations on this.leveldown.
-// Alternatively have the sublevel follow the open state of this.db.
 SubDown.prototype._open = function (opts, cb) {
-  var self = this
+  // TODO: start using db.status (added to levelup recently) in a next major.
+  const m = typeof this.db.isOpening === 'function' ? 'isOpening' : '_isOpening'
 
-  // TODO: make _isOpening public in levelup or add a method like
-  // ready(cb) which waits for - but does not initiate - a state change.
-  var m = typeof this.db.isOpening === 'function' ? 'isOpening' : '_isOpening'
+  const onopen = () => {
+    // TODO: start using db.status (added to levelup recently) in a next major.
+    if (!this.db.isOpen()) return cb(new Error('Parent database is not open'))
+    if (this.leveldown.status !== 'open') return cb(new Error('Inner database is not open'))
 
+    // TODO: add hooks to abstract-leveldown
+    if (this[kBeforeOpen]) return this[kBeforeOpen](cb)
+
+    cb()
+  }
+
   if (this.db[m]()) {
@@ -150,12 +181,2 @@ this.db.once('open', onopen)
   }
-
-  function onopen () {
-    if (!self.db.isOpen()) return cb(new Error('Parent database is not open'))
-    if (self.leveldown.status !== 'open') return cb(new Error('Inner database is not open'))
-
-    // TODO: add hooks to abstract-leveldown
-    if (self._beforeOpen) return self._beforeOpen(cb)
-
-    cb()
-  }
 }
@@ -177,2 +198,8 @@
 
+SubDown.prototype._getMany = function (keys, opts, cb) {
+  // maybeError is not necessary here, abstract-leveldown does that
+  keys = keys.map(key => concat(this.prefix, key))
+  this.leveldown.getMany(keys, opts, cb)
+}
+
 SubDown.prototype._del = function (key, opts, cb) {
@@ -187,3 +214,3 @@ if (maybeError(this.leveldown, cb)) return
   // No need to make a copy of the array, abstract-leveldown does that
-  for (var i = 0; i < operations.length; i++) {
+  for (let i = 0; i < operations.length; i++) {
     operations[i].key = concat(this.prefix, operations[i].key)
@@ -209,3 +236,3 @@ }
 function addRestOptions (target, opts) {
-  for (var k in opts) {
+  for (const k in opts) {
     if (hasOwnProperty.call(opts, k) && !isRangeOption(k)) {
@@ -234,3 +261,3 @@ target[k] = opts[k]
     // TODO: use require('level-errors').ReadError
-    process.nextTick(callback, new Error('Database is not open'))
+    ;(leveldown._nextTick || nextTick)(callback, new Error('Database is not open'))
     return true
@@ -242,26 +269,4 @@ }
 
-// TODO (refactor): use addRestOptions instead
-function extend (xopts, opts) {
-  xopts.keys = opts.keys
-  xopts.values = opts.values
-  xopts.createIfMissing = opts.createIfMissing
-  xopts.errorIfExists = opts.errorIfExists
-  xopts.keyEncoding = opts.keyEncoding
-  xopts.valueEncoding = opts.valueEncoding
-  xopts.compression = opts.compression
-  xopts.db = opts.db
-  xopts.limit = opts.limit
-  xopts.keyAsBuffer = opts.keyAsBuffer
-  xopts.valueAsBuffer = opts.valueAsBuffer
-  xopts.reverse = opts.reverse
-  xopts.fillCache = opts.fillCache
-  return xopts
-}
-
-function fixRange (opts) {
-  return (!opts.reverse || (!opts.end && !opts.start)) ? opts : { start: opts.end, end: opts.start }
-}
-
 SubDown.prototype._iterator = function (opts) {
-  var xopts = extend(wrap(fixRange(opts), this._wrap), opts)
+  const xopts = addRestOptions(wrap(opts, this._wrap), opts)
   return new SubIterator(this, this.leveldown.iterator(xopts), this.prefix)
@@ -268,0 +273,0 @@ }

matchdown.js

@@ -0,1 +1,3 @@
+'use strict'
+
 module.exports = function matchdown (db, type) {
@@ -2,0 +4,0 @@ // Skip layers that we handle ourselves

package.json

 {
   "name": "subleveldown",
-  "version": "5.0.1",
+  "version": "6.0.0",
   "description": "Split a levelup database into sublevels with their own keyspace, encoding and events",
@@ -10,3 +10,4 @@ "author": "Mathias Buus (@mafintosh)",
     "test": "standard && hallmark && (nyc -s node test | faucet) && nyc report",
-    "coverage": "nyc report --reporter=text-lcov | coveralls",
+    "test-browsers-local": "airtap test/index.js",
+    "coverage": "nyc report -r lcovonly",
     "hallmark": "hallmark --fix",
@@ -16,11 +17,15 @@ "dependency-check": "dependency-check --no-dev .",
   },
-  "directories": {
-    "test": "test"
-  },
+  "files": [
+    "index.js",
+    "leveldown.js",
+    "matchdown.js",
+    "CHANGELOG.md",
+    "UPGRADING.md"
+  ],
   "dependencies": {
-    "abstract-leveldown": "^6.3.0",
-    "encoding-down": "^6.2.0",
+    "abstract-leveldown": "^7.2.0",
+    "encoding-down": "^7.1.0",
     "inherits": "^2.0.3",
     "level-option-wrap": "^1.1.0",
-    "levelup": "^4.4.0",
+    "levelup": "^5.1.0",
     "reachdown": "^1.1.0"
@@ -30,23 +35,20 @@ },
     "after": "^0.8.2",
-    "coveralls": "^3.0.2",
+    "airtap": "^4.0.3",
+    "airtap-playwright": "^1.0.1",
     "dependency-check": "^4.1.0",
     "faucet": "^0.0.1",
-    "hallmark": "^2.0.0",
-    "level-community": "^3.0.0",
-    "level-concat-iterator": "^2.0.1",
-    "memdown": "^5.0.0",
-    "nyc": "^14.0.0",
-    "standard": "^14.0.0",
-    "tape": "^4.9.0"
+    "hallmark": "^3.1.0",
+    "level-concat-iterator": "^3.0.0",
+    "memdown": "^6.1.0",
+    "nyc": "^15.1.0",
+    "standard": "^16.0.3",
+    "tape": "^5.0.1"
   },
-  "hallmark": {
-    "community": "level-community"
-  },
   "repository": {
     "type": "git",
-    "url": "https://github.com/level/subleveldown.git"
+    "url": "https://github.com/Level/subleveldown.git"
   },
-  "homepage": "https://github.com/level/subleveldown",
+  "homepage": "https://github.com/Level/subleveldown",
   "bugs": {
-    "url": "https://github.com/level/subleveldown/issues"
+    "url": "https://github.com/Level/subleveldown/issues"
   },
@@ -57,4 +59,4 @@ "keywords": [
   "engines": {
-    "node": ">=6"
+    "node": ">=10"
   }
 }

README.md

@@ -6,10 +6,9 @@ # subleveldown
 [![level badge][level-badge]](https://github.com/Level/awesome)
-[![npm](https://img.shields.io/npm/v/subleveldown.svg?label=&logo=npm)](https://www.npmjs.com/package/subleveldown)
+[![npm](https://img.shields.io/npm/v/subleveldown.svg)](https://www.npmjs.com/package/subleveldown)
 [![Node version](https://img.shields.io/node/v/subleveldown.svg)](https://www.npmjs.com/package/subleveldown)
-[![Travis](https://img.shields.io/travis/com/Level/subleveldown.svg?logo=travis&label=)](https://travis-ci.com/Level/subleveldown)
-[![npm](https://img.shields.io/npm/dm/subleveldown.svg?label=dl)](https://www.npmjs.com/package/subleveldown)
-[![Coverage Status](https://coveralls.io/repos/github/Level/subleveldown/badge.svg)](https://coveralls.io/github/Level/subleveldown)
-[![JavaScript Style Guide](https://img.shields.io/badge/code_style-standard-brightgreen.svg)](https://standardjs.com)
-[![Backers on Open Collective](https://opencollective.com/level/backers/badge.svg?color=orange)](#backers)
-[![Sponsors on Open Collective](https://opencollective.com/level/sponsors/badge.svg?color=orange)](#sponsors)
+[![Test](https://img.shields.io/github/workflow/status/Level/subleveldown/Test?label=test)](https://github.com/Level/subleveldown/actions/workflows/test.yml)
+[![Coverage](https://img.shields.io/codecov/c/github/Level/subleveldown?label=&logo=codecov&logoColor=fff)](https://codecov.io/gh/Level/subleveldown)
+[![Standard](https://img.shields.io/badge/standard-informational?logo=javascript&logoColor=fff)](https://standardjs.com)
+[![Common Changelog](https://common-changelog.org/badge.svg)](https://common-changelog.org)
+[![Donate](https://img.shields.io/badge/donate-orange?logo=open-collective&logoColor=fff)](https://opencollective.com/level)
 
@@ -23,2 +22,3 @@ ## Table of Contents
 - [API](#api)
+  - [`subdb = sub(db[, prefix][, options])`](#subdb--subdb-prefix-options)
 - [Install](#install)
@@ -33,11 +33,11 @@ - [Contributing](#contributing)
 
-**If you are upgrading:** please see [UPGRADING.md](UPGRADING.md).
+_If you are upgrading: please see [UPGRADING.md](UPGRADING.md)._
 
 ```js
-var sub = require('subleveldown')
-var level = require('level')
+const sub = require('subleveldown')
+const level = require('level')
 
-var db = level('db')
-var example = sub(db, 'example')
-var nested = sub(example, 'nested')
+const db = level('db')
+const example = sub(db, 'example')
+const nested = sub(example, 'nested')
 ```
@@ -50,4 +50,4 @@
   nested.put('hi', 'welt', function () {
-    // will print {key:'hello', value:'world'}
-    example.createReadStream().on('data', console.log)
+    // Prints { key: 'hi', value: 'welt' }
+    nested.createReadStream().on('data', console.log)
   })
@@ -57,2 +57,23 @@ })
 
+Or with promises and iterators:
+
+```js
+await example.put('hello', 'world')
+await nested.put('hi', 'welt')
+
+for await (const [key, value] of nested.iterator()) {
+  // Prints ['hi', 'welt']
+  console.log([key, value])
+}
+```
+
+Sublevels see their own keys as well as keys of any nested sublevels:
+
+```js
+// Prints:
+// { key: '!nested!hi', value: 'welt' }
+// { key: 'hello', value: 'world' }
+example.createReadStream().on('data', console.log)
+```
+
 They also support `db.clear()` which is very useful to empty a bucket of stuff:
@@ -66,3 +87,3 @@
 
-// For believers
+// With promises
 await example.clear()
@@ -119,15 +140,7 @@ ```
 
-To sustain [`Level`](https://github.com/Level) and its activities, become a backer or sponsor on [Open Collective](https://opencollective.com/level). Your logo or avatar will be displayed on our 28+ [GitHub repositories](https://github.com/Level) and [npm](https://www.npmjs.com/) packages. 💖
+Support us with a monthly donation on [Open Collective](https://opencollective.com/level) and help us continue our work.
 
-### Backers
-
-[![Open Collective backers](https://opencollective.com/level/backers.svg?width=890)](https://opencollective.com/level)
-
-### Sponsors
-
-[![Open Collective sponsors](https://opencollective.com/level/sponsors.svg?width=890)](https://opencollective.com/level)
-
 ## License
 
-[MIT](LICENSE.md) © 2014-present [Mathias Buus](https://github.com/mafintosh) and [Contributors](CONTRIBUTORS.md).
+[MIT](LICENSE)
 
@@ -134,0 +147,0 @@ [level-badge]: https://leveljs.org/img/badge.svg

UPGRADING.md

@@ -5,4 +5,29 @@ # Upgrade Guide
 
-## v5
+## 6.0.0
 
+Legacy range options have been removed ([Level/community#86](https://github.com/Level/community/issues/86)). If you previously did:
+
+```js
+db.createReadStream({ start: 'a', end: 'z' })
+```
+
+An error would now be thrown and you must instead do:
+
+```js
+db.createReadStream({ gte: 'a', lte: 'z' })
+```
+
+The same applies to `db.iterator()`, `db.createKeyStream()` and `db.createValueStream()`.
+
+This release also drops support of legacy runtime environments ([Level/community#98](https://github.com/Level/community/issues/98)):
+
+- Node.js 6 and 8
+- Internet Explorer 11
+- Safari 9-11
+- Stock Android browser (AOSP).
+
+Some private properties have been replaced with Symbols ([`1f9d550`](https://github.com/Level/subleveldown/commit/1f9d550)). Lastly, in browsers, `process.nextTick()` has been replaced with [`queue-microtask`](https://github.com/feross/queue-microtask), except in streams.
+
+## 5.0.0
+
 ### Fixes iterating buffer keys that contain bytes 196-255 ([#88](https://github.com/level/subleveldown/issues/88))
@@ -61,3 +86,3 @@
 
-## v4
+## 4.0.0
 
@@ -71,3 +96,3 @@ Upgraded to `abstract-leveldown@6`, `encoding-down@6` and `levelup@4`. We recommend to pair `subleveldown@4` with `level` >= 5 or when using a custom store, one that is based on `abstract-leveldown` >= 6. For details please see:
 
-## v3
+## 3.0.0
 
@@ -74,0 +99,0 @@ Dropped support for node 4.

New alerts

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Found 1 instance in 1 package

Major refactor

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Package has recently undergone a major refactor. It may be unstable or indicate significant internal changes. Use caution when updating to versions that include significant changes.

Found 1 instance in 1 package

Fixed alerts

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This package is not allowed per your license policy. Review the package's license to ensure compliance.

Found 1 instance in 1 package

Improved metrics

Number of lines in readme file

151

increased by9.42%

Worsened metrics

Total package byte prevSize

37816

decreased by-32.12%

Number of package files

8

decreased by-27.27%

Lines of code

228

decreased by-71.85%

Number of medium supply chain risk alerts

1

increased byInfinity%

Dependency changes

• + Addedabstract-leveldown@7.2.0(transitive)

• + Addedbuffer@6.0.3(transitive)

• + Addedcatering@2.1.1(transitive)

• + Addeddeferred-leveldown@7.0.0(transitive)

• + Addedencoding-down@7.1.0(transitive)

• + Addedis-buffer@2.0.5(transitive)

• + Addedlevel-codec@10.0.0(transitive)

• + Addedlevel-concat-iterator@3.1.0(transitive)

• + Addedlevel-errors@3.0.1(transitive)

• + Addedlevel-iterator-stream@5.0.0(transitive)

• + Addedlevel-supports@2.1.0(transitive)

• + Addedlevelup@5.1.1(transitive)

• + Addedqueue-microtask@1.2.3(transitive)

• - Removedabstract-leveldown@6.2.36.3.0(transitive)

• - Removedbuffer@5.7.1(transitive)

• - Removeddeferred-leveldown@5.3.0(transitive)

• - Removedencoding-down@6.3.0(transitive)

• - Removederrno@0.1.8(transitive)

• - Removedimmediate@3.3.0(transitive)

• - Removedlevel-codec@9.0.2(transitive)

• - Removedlevel-concat-iterator@2.0.1(transitive)

• - Removedlevel-errors@2.0.1(transitive)

• - Removedlevel-iterator-stream@4.0.2(transitive)

• - Removedlevel-supports@1.0.1(transitive)

• - Removedlevelup@4.4.0(transitive)

• - Removedprr@1.0.1(transitive)

• - Removedxtend@4.0.2(transitive)

• Updatedabstract-leveldown@^7.2.0

• Updatedencoding-down@^7.1.0

• Updatedlevelup@^5.1.0