Call multiple denops functions sequentially without RPC overhead and return values

import { Denops } from "../mod.ts";
import { gather } from "./gather.ts";

export async function main(denops: Denops): Promise<void> {
  const results = await gather(denops, async (denops) => {
    await denops.eval("&modifiable");
    await denops.eval("&modified");
    await denops.eval("&filetype");
  });
  // results contains the value of modifiable, modified, and filetype
}

Not like batch, the function can NOT be nested.

Note that denops.call() or denops.eval() always return falsy value in gather(), indicating that you cannot write code like below:

import { Denops } from "../mod.ts";
import { gather } from "./gather.ts";

export async function main(denops: Denops): Promise<void> {
  const results = await gather(denops, async (denops) => {
    // !!! DON'T DO THIS !!!
    if (await denops.call("has", "nvim")) {
      // deno-lint-ignore no-explicit-any
      await (denops.call("api_info") as any).version;
    } else {
      await denops.eval("v:version");
    }
  });
}

The denops instance passed to the gather block is NOT available outside of the block. An error is thrown when denops.call(), denops.cmd(), or denops.eval() is called.

Note that denops.redraw() cannot be called within gather(). If it is called, an error is raised.