feat(async-each): concurrency 0 means no limit

It's identical to `Infinity` but has broader support (e.g. in JSON).

@vates/async-each/.USAGE.md

@@ -14,7 +14,7 @@ Returns a promise wich rejects as soon as a call to `iteratee` throws or a promi
 
 `opts` is an object that can contains the following options:
 
-- `concurrency`: a number which indicates the maximum number of parallel call to `iteratee`, defaults to `1`
+- `concurrency`: a number which indicates the maximum number of parallel call to `iteratee`, defaults to `1`. The value `0` means no concurrency limit.
 - `signal`: an abort signal to stop the iteration
 - `stopOnError`: wether to stop iteration of first error, or wait for all calls to finish and throw an `AggregateError`, defaults to `true`
 

@vates/async-each/README.md

@@ -32,7 +32,7 @@ Returns a promise wich rejects as soon as a call to `iteratee` throws or a promi
 
 `opts` is an object that can contains the following options:
 
-- `concurrency`: a number which indicates the maximum number of parallel call to `iteratee`, defaults to `1`
+- `concurrency`: a number which indicates the maximum number of parallel call to `iteratee`, defaults to `1`. The value `0` means no concurrency limit.
 - `signal`: an abort signal to stop the iteration
 - `stopOnError`: wether to stop iteration of first error, or wait for all calls to finish and throw an `AggregateError`, defaults to `true`
 

@vates/async-each/index.js

@@ -10,6 +10,9 @@ class AggregateError extends Error {
 }
 
 exports.asyncEach = function asyncEach(iterable, iteratee, { concurrency = 1, signal, stopOnError = true } = {}) {
+  if (concurrency === 0) {
+    concurrency = Infinity
+  }
   return new Promise((resolve, reject) => {
     const it = (iterable[Symbol.iterator] || iterable[Symbol.asyncIterator]).call(iterable)
     const errors = []

CHANGELOG.unreleased.md

@@ -29,6 +29,7 @@
 
 <!--packages-start-->
 
+- @vates/async-each minor
 - xo-web minor
 
 <!--packages-end-->