Consider defaulting jsc target to the current Node version's supported level

[JoshuaKGoldberg]

Generators and async/await have been fully supported in Node for years, but the default SWC options are still set to transpile them to using regenerator-runtime. Since @swc/jest is specifically for usage in Jest, if there isn't a jsc.target specified in .swcrc or the Jest config, can it default to whatever level is supported by the runtime Node version?

Reasoning: it's a little extra work for projects that don't yet have a SWC configuration to specify a jsc target. https://swc.rs/docs/usage/jest indicates your Jest configuration only needs to include:

module.exports = {
  transform: {
    "^.+\\.(t|j)sx?$": ["@swc/jest"],
  },
};

...but in actuality, if this is your first swc setup, you need something more like:

module.exports = {
    transform: {
        "^.+\\.(t|j)s$": [
            "@swc/jest",
            {
                jsc: {
                    target: "es2021",
                },
            },
        ],
    },
};

...which is a pain point for new SWC users and a bit of noisy configuration.

[kdy1]

It sounds good to me.