As a temporary workaround, since idl files are simple .json files you can bundle it within the web-app and load it with a simple:

import idl from "./testprogram.json";
...
new anchor.Program(idl, ...)

As a temporary workaround, since idl files are simple .json files you can bundle it within the web-app and load it with a simple:

import idl from "./testprogram.json";
...
new anchor.Program(idl, ...)

Edit:
Even better, you may copy the target/types/testprogram.ts file into the app and import both the IDL and Contract type with:

import { Testprogram, IDL } from "./testprogram";