init: add source code from src.zip

src/ink/instances.ts

@@ -0,0 +1,10 @@
+// Store all instances of Ink (instance.js) to ensure that consecutive render() calls
+// use the same instance of Ink and don't create a new one
+//
+// This map has to be stored in a separate file, because render.js creates instances,
+// but instance.js should delete itself from the map on unmount
+
+import type Ink from './ink.js'
+
+const instances = new Map<NodeJS.WriteStream, Ink>()
+export default instances