const enums don't work with ts-jest

[microbit-carlos]

Currently affecting ihex.RecordType.

A possible workaround might be to move the enum into its own file. Tests in ts-jest work with files configured that way: https://github.com/kulshekhar/ts-jest/tree/2852078d83cc58eed3986aa2e3e210cd5d306b23/e2e/__cases__/const-enum

• Issues with exporting and importing enums kulshekhar/ts-jest#281
• [Question]Const enum still not working kulshekhar/ts-jest#944
• constant enums are not compiled... again! (v23.10.5) kulshekhar/ts-jest#962