v0.97.1

• Breaking change Add the passing on an explicit Registry to all calls to createType as well as all codec classes. If you are upgrading form an older version, use the migration guide to walk through the changes required.
• Breaking change The metadata classes have been moved from @polkadot/types into @polkadot/metadata. If you explicitly create Metadata classes, you now would need to do so with the import Metadata from '@polkadot/metadata'; This is a decorated class, where the previous metadata is now available on Metadata.metadata, alongside decorated consts.*', tx.* and query.*.
• Breaking change Session Keys defaults to 4 keys now (Substrate master), depending on your node config, you would want to override with e.g. Keys: 'SessionKeys3' (1, 2, 3, 4, 5 & 6)
• Breaking change ValidatorPrefs now default to the new percentage commission model, to use the previous validatorPayment, you can override with ValidatorPrefs: 'ValidatorPrefsTo196'
• api.derive.* now has built-in memomization
• Various fixes and cleanups to api.derive.* including era length progress and vesting calculations
• Aligned all types with the latest Polkadot & Substrate, including Kusama CC3
• Support for Metadata V9, which adjusts the hashing methods of storage entries
• Support for Metadata V10 (still un-released), which includes prefixed map support

v0.96.1

• Updated types for latest Kusama
• Add filterRecords (in addition to findRecord) on submittable results
• Various ABI v2 contract fixes
• Update derive for elections (incl. RunnersUp) and heartbeat derives (with blocks & messages)
• Add vesting totals & locked breakdowns to derive balances
• Update council derives for the latest Substrate master support (with constants)
• Derive cleanups, including sharing of instances between the API and internal to derives

v0.95.2

• Support Extrinsic V4 with additional signature indicator (Latest Polkadot/Substrate/Kusama)
• Adjust subscription update checks to avoid duplicated data updates
• Support Metadata V8 (exposes per-module decl_error definitions)
• Support next generation contracts ABI (with additional type definitions)
• Support for BTreeMap<K, V> types and definitions
• All latest Polkadot & Substrate types (as per master branches)
• Breaking change Call.injectMethods is moved to Call.injectMetadata to align with Events (This should not be used externally, however mentioned as breaking here)

v0.94.1

• Add handling of Result<Ok, Error> definitions
• Adjust API cloning now takes RPC filters from source into account
• Simplification of isPedantic checks and less overhead on StorageData types
• Cleanups and fixes around RPC and derive type definitions
• Fix derive.imOnline.receivedHeatbeats to query via indexes
• Adjustment of api.derive.elections.{approvalsOf|approvalsOfAt} to allow ss58 address input
• Cleanup Enum .eq handling to be more exhaustive
• Add documentation for custom extrinsic formats (advanced chains)
• Update to latest substrate master metadata

v0.93.1

• Support for Kusama CC2
• In extrinsic submission, use rpc.account.nextIndex to retrieve the nonce when available
• For TypeScript users api.query.*.* is now properly typed for default Substrate calls, i.e. api.query.balances.freeBalance(...) will return a Balance type. Additionally the api.queryMulti and .multi on queries not allow generic type params.
• Add api.rpc.accounts.nextIndex, api.rpc.contracts.call and api.rpc.rpc.methods calls. Optional calls (such as account/contracts) is decorated based on the results from rpc.methods, so they don't show up on nodes where they are not active.
• Updated types to support the latest Polkadot/Substrate master changes
• Support recursive type registration (self-referencing via Box) in addition to better sanitation of user-defined-types
• Documentation and example updates (thanks mostly to contributions)

v0.92.1

• The API now correctly sets the ss58 prefix as retrieved from the chain properties via ss58Format
• Bump to @polkadot/util 1.4.1, removing use of ExtError
• The Keyring from @polkadot/keyring is now exposed on the API as well. You can do import { Keyring } from '@polkadot/api' - this alleviates the need for extra dependencies (apart from @polkadot/api), and since the keyring is critical for signing operations, aligns everything in one bundle
• Support the latest Polkadot & Substrate master branches (incl. metadata updates)
• Getting started documentation has been made available

v0.91.1

• This release was focussed on stability, with a number of cleanups and bug-fixes
• Adjustments for Substrate 1.x chain detection (with auto-types) and Substrate 2.x support has been extended with all latest types
• The getRuntimeVersion and subscribeRuntimeVersion RPCs are now only available on the rpc.state.* endpoints. This aligns with the Substrate implementation.
• The author_insertKey RPC's last argument publicKey is now required, as to reflect Substrate implementation.
• Support for extrinsics with versions that is not in the base Substrate implementation (V1-V3) can now be done by providing an implementation for ExtrinsicUnknown
• Redeemed balance calculation if api.derive now returns the correct values again (bugfix)
  added the yarn chain:info [--ws URL] utility to extract a calls-only metadata version
• Missing types are now logged via a console.warn, not via .error
• Extrinsic, ExtrinsicPayload & SignerPayload is registered in the type registry and can be overriden now

v0.90.1

Support for Kusama with Polkadot 0.5.0 and current pre-release Substrate 2.x networks. (Along with existing Substrate 1.x-era networks)

When upgrading, take care of looking at the CHANGELOG and UPGRADING guides.