v6.0.0

6.0.0 (2022-02-02)

Features

• add additional configuration that generates ES Modules (1e919ce)
• add additional configurations for DOM and WebWorker environments (95b0fc1)
• drop support for TypeScript <4.0 (9473a2a)
• fix broken "extends" clause in CommonJS configurations (26e1aac)
• require TypeScript >= 4.2 (4e4a18a)
• require TypeScript >=4.5 (766597b)
• set exactOptionalPropertyTypes option (1ecdbd9)
• set noImplicitOverride option (c8ab892)
• node: drop support for node ^13 || ^15 (33e3ec2)
• set noPropertyAccessFromIndexSignature (2858e04)
• set noUncheckedIndexedAccess option (00a093c)

BREAKING CHANGES

• undefined is no longer assignable to optional properties, unless the type of the
  property explicitly includes undefined. See
  https://www.typescriptlang.org/docs/handbook/release-notes/typescript-4-4.html#exact-optional-property-types---exactoptionalpropertytypes
• Methods that override a method from a base class must now be marked with the
  override keyword. See:
  https://www.typescriptlang.org/docs/handbook/release-notes/typescript-4-3.html#override-and-the---noimplicitoverride-flag
• TypeScript >=4.5 is now required.
• node: node ^13 || ^15 are no longer supported.
• Fields accessed via index signatures now always include the type "undefined" to
  better match the underlying runtime behaviour. This forces a not-null check on the fields before
  they can be used, which can avoid a class of nullity bugs. See
  https://www.typescriptlang.org/docs/handbook/release-notes/typescript-4-1.html#checked-indexed-accesses---nouncheckedindexedaccess
• TypeScript >= 4.2 is now required.
• noPropertyAccessFromIndexSignature is set, which requires the use of square bracket
  notation to access fields via index signatures. This is to guard against spelling errors. See
  https://devblogs.microsoft.com/typescript/announcing-typescript-4-2/#no-property-access-index-signature
  for rationale.
• TypeScript <4.0 is no longer supported.