Method apply

src/map.ts:250–277

(instructions: unknown[])

  }

  apply(instructions: unknown[]): RpcPayload {
    try {
      if (instructions.length < 1) {
        throw new Error("Invalid empty mapper function.");
      }

      for (let instruction of instructions.slice(0, -1)) {
        let payload = new Evaluator(this).evaluateCopy(instruction);

        // The payload almost always contains a single stub. As an optimization, unwrap it.
        if (payload.value instanceof RpcStub) {
          let hook = unwrapStubNoProperties(payload.value);
          if (hook) {
            this.variables.push(hook);
            continue;
          }
        }

        this.variables.push(new PayloadStubHook(payload));
      }

      return new Evaluator(this).evaluateCopy(instructions[instructions.length - 1]);
    } finally {
      for (let variable of this.variables) {
        variable.dispose();
      }
    }
  }

  importStub(idx: ImportId): StubHook {
    // This implies we saw an "export" appear inside the body of a mapper function. This should be