Added

• Expose ts-node REPL via the API (#1121) @MarcManiez
• Allow --typeCheck flag to override --transpileOnly flag specified in tsconfig.json (#1142)

Changed

• Rename interface Register to Service. It is still aliased as Register for backwards compatibility (#1158)
• Update code copied from node's ESM resolver to be the latest from node 15, to keep our ESM resolver's behavior as close as possible to vanilla node (#1167)

Fixed

• ESM resolver will preserve search portion of URL, used for cache busting (#1165) @frandiox
• Fix ESM resolution of builtin modules on node >=14.13.1 (#1136)
• Recognize --es-module-specifier-resolution as an alias of --experimental-specifier-resolution for node 12 compatibility (#1122) @nguyensomniac

Docs

• Fix description of ts-node-dev in README (#1131) @iamandrewluca
• Update transformers description to clarify incompatibility with transpileOnly (#1123)

Misc

• Changes to test matrix: Test against node 15; drop node 13 tests; remove 12.16 in favor of latest 12.x.x (#1138, #1148)
• Improve codecov rules to remove misleading test failures (#1159)

v9.0.0...v9.1.0