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Migrate to TypeScript
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@whymarrh
whymarrh committed Mar 19, 2019
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# Changelog

All notable changes to this project will be documented in this file.

The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
(modification: no type change headlines) and this project adheres to
The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
(modification: no type change headlines) and this project adheres to
[Semantic Versioning](http://semver.org/spec/v2.0.0.html).


## [3.4.0] - 2019-02-06
**Petersburg** (aka `constantinopleFix`) as well as **Goerli**
support/readiness by updating to a supporting `ethereumjs-common` version
[v1.1.0](https://github.com/ethereumjs/ethereumjs-common/releases/tag/v1.1.0),

**Petersburg** (aka `constantinopleFix`) as well as **Goerli**
support/readiness by updating to a supporting `ethereumjs-common` version
[v1.1.0](https://github.com/ethereumjs/ethereumjs-common/releases/tag/v1.1.0),
PR [#86](https://github.com/ethereumjs/ethereumjs-blockchain/pull/86)

[3.4.0]: https://github.com/ethereumjs/ethereumjs-blockchain/compare/v3.3.3...v3.4.0

## [3.3.3] - 2019-01-03
- Fixed a bug causing the ``iterate()`` method to fail when an older version
``levelup`` DB instance is passed, see PR [#83](https://github.com/ethereumjs/ethereumjs-blockchain/pull/83)

- Fixed a bug causing the `iterate()` method to fail when an older version
`levelup` DB instance is passed, see PR [#83](https://github.com/ethereumjs/ethereumjs-blockchain/pull/83)

[3.3.3]: https://github.com/ethereumjs/ethereumjs-blockchain/compare/v3.3.2...v3.3.3

## [3.3.2] - 2018-12-20
- Updated ``levelup`` dependency to ``level-mem`` ``v3.0.1``, PR [#75](https://github.com/ethereumjs/ethereumjs-blockchain/pull/75)
- Fix ``putBlock()`` edge case, PR [#79](https://github.com/ethereumjs/ethereumjs-blockchain/pull/79)

- Updated `levelup` dependency to `level-mem` `v3.0.1`, PR [#75](https://github.com/ethereumjs/ethereumjs-blockchain/pull/75)
- Fix `putBlock()` edge case, PR [#79](https://github.com/ethereumjs/ethereumjs-blockchain/pull/79)
- Replaced uses of deprecated `new Buffer` with `Buffer.from`, PR [#80](https://github.com/ethereumjs/ethereumjs-blockchain/pull/80)

[3.3.2]: https://github.com/ethereumjs/ethereumjs-blockchain/compare/v3.3.1...v3.3.2

## [3.3.1] - 2018-10-26
- Replaced calls to BN.toBuffer() with BN.toArrayLike() so that ``ethereumjs-blockchain`` can run in a browser environment, PR [#73](https://github.com/ethereumjs/ethereumjs-blockchain/pull/73)

- Replaced calls to BN.toBuffer() with BN.toArrayLike() so that `ethereumjs-blockchain` can run in a browser environment, PR [#73](https://github.com/ethereumjs/ethereumjs-blockchain/pull/73)

[3.3.1]: https://github.com/ethereumjs/ethereumjs-blockchain/compare/v3.3.0...v3.3.1

## [3.3.0] - 2018-10-19
- Constantinople support when using block validation (set with ``opts.validate`` in constructor),
update to a Constantinople-ready version of the ``ethereumjs-block`` dependency (>2.1.0), PR [#71](https://github.com/ethereumjs/ethereumjs-blockchain/pull/71)

- Constantinople support when using block validation (set with `opts.validate` in constructor),
update to a Constantinople-ready version of the `ethereumjs-block` dependency (>2.1.0), PR [#71](https://github.com/ethereumjs/ethereumjs-blockchain/pull/71)

[3.3.0]: https://github.com/ethereumjs/ethereumjs-blockchain/compare/v3.2.1...v3.3.0

## [3.2.1] - 2018-08-29
- Fixed an issue with the ``iterator()`` function returning an error on end of block iteration instead of finish gracefully, PR [#64](https://github.com/ethereumjs/ethereumjs-blockchain/pull/64)
- Updated ``ethereumjs-common`` dependency to ``v0.5.0`` (custom chain support), PR [#63](https://github.com/ethereumjs/ethereumjs-blockchain/pull/63)

- Fixed an issue with the `iterator()` function returning an error on end of block iteration instead of finish gracefully, PR [#64](https://github.com/ethereumjs/ethereumjs-blockchain/pull/64)
- Updated `ethereumjs-common` dependency to `v0.5.0` (custom chain support), PR [#63](https://github.com/ethereumjs/ethereumjs-blockchain/pull/63)

[3.2.1]: https://github.com/ethereumjs/ethereumjs-blockchain/compare/v3.2.0...v3.2.1

## [3.2.0] - 2018-08-13

- Added support for setting network and performing hardfork-specific validation by integrating with [ethereumjs-common](https://github.com/ethereumjs/ethereumjs-common), PR [#59](https://github.com/ethereumjs/ethereumjs-blockchain/pull/59)
- Added ``Blockchain.putHeader()`` and ``Blockchain.putHeaders()`` functions to provide header-chain functionality (needed by ethereumjs-client), PR [#59](https://github.com/ethereumjs/ethereumjs-blockchain/pull/59)
- Added `Blockchain.putHeader()` and `Blockchain.putHeaders()` functions to provide header-chain functionality (needed by ethereumjs-client), PR [#59](https://github.com/ethereumjs/ethereumjs-blockchain/pull/59)
- Fixed a bug with caching, PR [#59](https://github.com/ethereumjs/ethereumjs-blockchain/pull/59)
- Fixed error propagation in ``Blockchain.iterator()``, PR [#60](https://github.com/ethereumjs/ethereumjs-blockchain/pull/60)
- Fixed error propagation in `Blockchain.iterator()`, PR [#60](https://github.com/ethereumjs/ethereumjs-blockchain/pull/60)

[3.2.0]: https://github.com/ethereumjs/ethereumjs-blockchain/compare/v3.1.0...v3.2.0

## [3.1.0] - 2018-05-24
- New ``getLatestHeader()`` and ``getLatestBlock()`` methods for retrieving the latest header

- New `getLatestHeader()` and `getLatestBlock()` methods for retrieving the latest header
respectively full block in the canonical chain, PR [#52](https://github.com/ethereumjs/ethereumjs-blockchain/pull/52)
- Fixed ``saveHeads()`` bug not storing the internal ``headHeader``/``headBlock`` header cursors
- Fixed `saveHeads()` bug not storing the internal `headHeader`/`headBlock` header cursors
to the DB, PR [#52](https://github.com/ethereumjs/ethereumjs-blockchain/pull/52)
- Updated API docs

[3.1.0]: https://github.com/ethereumjs/ethereumjs-blockchain/compare/v3.0.0...v3.1.0

## [3.0.0] - 2018-05-18

This release comes with heavy internal changes bringing Geth DB compatibility to the
``ethereumjs-blockchain`` library. For a full list of changes and associated discussion
`ethereumjs-blockchain` library. For a full list of changes and associated discussion
see PR [#47](https://github.com/ethereumjs/ethereumjs-blockchain/pull/47)
(thanks to @vpulim for this amazing work!). To test iterating through your local Geth
chaindata DB you can run the [example](https://github.com/ethereumjs/ethereumjs-blockchain#example)
Expand All @@ -76,64 +85,69 @@ instances, so it is not possible to load an old DB with the new library version
problems for you get in touch on GitHub or Gitter!).

Summary of the changes:
- New unified constructor where ``detailsDB`` and ``blockDB`` are replaced by a single ``db`` reference
- Deprecation of the ``getDetails()`` method now returning an empty object
- ``td`` and ``height`` are not stored in the db as meta info but computed as needed

- New unified constructor where `detailsDB` and `blockDB` are replaced by a single `db` reference
- Deprecation of the `getDetails()` method now returning an empty object
- `td` and `height` are not stored in the db as meta info but computed as needed
- Block headers and body are stored under two separate keys
- Changes have been made to properly rebuild the chain and number/hash mappings as a result of forks and deletions
- A write-through cache has been added to reduce database reads
- Similar to geth, we now defend against selfish mining vulnerability
- Similar to geth, we now defend against selfish mining vulnerability
- Added many more tests to increase coverage to over 90%
- Updated docs to reflect the API changes
- Updated library dependencies

[3.0.0]: https://github.com/ethereumjs/ethereumjs-blockchain/compare/v2.1.0...v3.0.0

## [2.1.0] - 2017-10-11
- ``Metro-Byzantium`` compatible
- Updated ``ethereumjs-block`` dependency (new difficulty formula / difficulty bomb delay)

- `Metro-Byzantium` compatible
- Updated `ethereumjs-block` dependency (new difficulty formula / difficulty bomb delay)

[2.1.0]: https://github.com/ethereumjs/ethereumjs-blockchain/compare/v2.0.2...v2.1.0

## [2.0.2] - 2017-09-19
- Tightened dependencies to prevent the ``2.0.x`` version of the library to break
after ``ethereumjs`` Byzantium library updates

- Tightened dependencies to prevent the `2.0.x` version of the library to break
after `ethereumjs` Byzantium library updates

[2.0.2]: https://github.com/ethereumjs/ethereumjs-blockchain/compare/v2.0.1...v2.0.2

## [2.0.1] - 2017-09-14

- Fixed severe bug adding blocks before blockchain init is complete

[2.0.1]: https://github.com/ethereumjs/ethereumjs-blockchain/compare/v2.0.0...v2.0.1

## [2.0.0] - 2017-01-01
- Split ``db`` into ``blockDB`` and ``detailsDB`` (breaking)

- Split `db` into `blockDB` and `detailsDB` (breaking)

[2.0.0]: https://github.com/ethereumjs/ethereumjs-blockchain/compare/v1.4.2...v2.0.0

## [1.4.2] - 2016-12-29
- New ``getBlocks`` API method

- New `getBlocks` API method
- Testing improvements

[1.4.2]: https://github.com/ethereumjs/ethereumjs-blockchain/compare/v1.4.1...v1.4.2

## [1.4.1] - 2016-03-01

- Update dependencies to support Windows

[1.4.1]: https://github.com/ethereumjs/ethereumjs-blockchain/compare/v1.4.0...v1.4.1

## [1.4.0] - 2016-01-09

- Bump dependencies

[1.4.0]: https://github.com/ethereumjs/ethereumjs-blockchain/compare/v1.3.4...v1.4.0


## Older releases:

- [1.3.4](https://github.com/ethereumjs/ethereumjs-blockchain/compare/v1.3.3...v1.3.4) - 2016-01-08
- [1.3.3](https://github.com/ethereumjs/ethereumjs-blockchain/compare/v1.3.2...v1.3.3) - 2015-11-27
- [1.3.2](https://github.com/ethereumjs/ethereumjs-blockchain/compare/v1.3.1...v1.3.2) - 2015-11-27
- [1.3.1](https://github.com/ethereumjs/ethereumjs-blockchain/compare/v1.2.0...v1.3.1) - 2015-10-23
- 1.2.0 - 2015-10-01


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