feat!: implement with unjs template

[nozomuikuta]

No related PRs.

I applied unjs/template to this repository.

⚠️ This PR includes breaking changes:

• Return type of serial is now Promise<unknown> (as far as I research, there is no way to exactly infer type of the last result). Treating it as unknown is for safety (cf. any). I added "escape hatch" to its typing (i.e. second type argument), for cases where developer is sure what is return type of the function.

const tasks = [1, "2", 3, 4];

const result = await serial(tasks, (task, previous) => {
  return Promise.resolve(Number(task) + Number(/* unknown */ previous === null ? 0 : previous));
});

const result = await serial<(number | string)[], number>(tasks, (task, previous) => {
  return Promise.resolve(Number(task) + Number(/* number | null */ previous === null ? 0 : previous));
});

---

Please close this PR with a message if it is not needed to "unjs-nize" the repository, or is there any other way I can contribute?

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (main@f951c3a). Click here to learn what that means.
The diff coverage is n/a.

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  Files           ?         1           
  Lines           ?        20           
  Branches        ?         7           
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  Hits            ?        20           
  Misses          ?         0           
  Partials        ?         0           

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[nozomuikuta]

Should I pass undefined instead?

[nozomuikuta]

Of course, only if you are fine.

[nozomuikuta]

📝 Applied unjs/template (until 070b86f)