Method callback

wasm/browser/src/mains/spn.main.js:249–250

(...arguments_)

        accumulator.fs = accumulator.fs || {};
        const reference = csoundApi[apiName];
        const callback = async (...arguments_) =>
          makeSingleThreadCallback(this.wasm, csoundApi[apiName]).apply({}, arguments_);
        callback.toString = reference.toString;
        accumulator.fs[apiName] = callback;
      } else {