Add conditional BigInt support to loader & minor README fixes

lib/loader/index.d.ts

@@ -13,21 +13,25 @@ interface ImportsObject {
 /** Utility mixed in by the loader. */
 interface ASUtil {
   /** An 8-bit signed integer view on the memory. */
-  readonly I8: Uint8Array,
+  readonly I8: Uint8Array;
   /** An 8-bit unsigned integer view on the memory. */
-  readonly U8: Uint8Array,
+  readonly U8: Uint8Array;
   /** A 16-bit signed integer view on the memory. */
-  readonly I16: Uint16Array,
+  readonly I16: Uint16Array;
   /** A 16-bit unsigned integer view on the memory. */
-  readonly U16: Uint16Array,
+  readonly U16: Uint16Array;
   /** A 32-bit signed integer view on the memory. */
-  readonly I32: Uint32Array,
+  readonly I32: Uint32Array;
   /** A 32-bit unsigned integer view on the memory. */
-  readonly U32: Uint32Array,
+  readonly U32: Uint32Array;
+  /** A 64-bit signed integer view on the memory. */
+  readonly I64: any; // BigInt64Array
+  /** A 64-bit unsigned integer vieww on the memory. */
+  readonly U64: any; // BigUint64Array
   /** A 32-bit float view on the memory. */
-  readonly F32: Float32Array,
+  readonly F32: Float32Array;
   /** A 64-bit float view on the memory. */
-  readonly F64: Float64Array,
+  readonly F64: Float64Array;
   /** Allocates a new string in the module's memory and returns its pointer. */
   newString(str: string): number;
   /** Gets a string from the module's memory by its pointer. */