Remove src dts files and correct exports

Esbuild doesn't appear to play nice with dts files and when they are regular ts
files they require the exports

src/common/InputHandler.test.ts

@@ -5,7 +5,7 @@
 
 import { assert } from 'chai';
 import { InputHandler } from 'common/InputHandler';
-import { IBufferLine, IAttributeData, IColorEvent, ColorIndex, ColorRequestType, SpecialColorIndex } from 'common/Types';
+import { IBufferLine, IAttributeData, IColorEvent, ColorRequestType, SpecialColorIndex } from 'common/Types';
 import { DEFAULT_ATTR_DATA } from 'common/buffer/BufferLine';
 import { CellData } from 'common/buffer/CellData';
 import { Attributes, BgFlags, UnderlineStyle } from 'common/buffer/Constants';

src/common/InputHandler.ts

@@ -3456,6 +3456,6 @@ class DirtyRowTracker implements IDirtyRowTracker {
   }
 }
 
-function isValidColorIndex(value: number): value is ColorIndex {
+export function isValidColorIndex(value: number): value is ColorIndex {
   return 0 <= value && value < 256;
 }

src/common/Types.ts

@@ -425,8 +425,8 @@ type Enumerate<N extends number, Acc extends number[] = []> = Acc['length'] exte
   : Enumerate<N, [...Acc, Acc['length']]>;
 type IntRange<F extends number, T extends number> = Exclude<Enumerate<T>, Enumerate<F>>;
 
-type ColorIndex = IntRange<0, 256>; // number from 0 to 255
-type AllColorIndex = ColorIndex | SpecialColorIndex;
+export type ColorIndex = IntRange<0, 256>; // number from 0 to 255
+export type AllColorIndex = ColorIndex | SpecialColorIndex;
 export const enum SpecialColorIndex {
   FOREGROUND = 256,
   BACKGROUND = 257,