Support old typescript compiler
Support old typescript compiler

dfahlander/Dexie.js,chrahunt/Dexie.js,chrahunt/Dexie.js,jimmywarting/Dexie.js,YuriSolovyov/Dexie.js,dfahlander/Dexie.js,chrahunt/Dexie.js,chrahunt/Dexie.js,jimmywarting/Dexie.js,jimmywarting/Dexie.js,dfahlander/Dexie.js,YuriSolovyov/Dexie.js,jimmywarting/Dexie.js,dfahlander/Dexie.js