Expose SourceLocation data type

src/index.ts

@@ -9,6 +9,7 @@ export { Duration } from "./Duration";
 export { Intensity, ConstantIntensity, RangeIntensity, FreeIntensity } from "./Intensity";
 export { ZoneType, intensityValueToZoneType } from "./ZoneType";
 export { ParseError } from "./parser/ParseError";
+export { SourceLocation } from "./parser/tokenizer";
 
 // utils
 export { totalDuration } from "./stats/totalDuration";