Add node modules and compiled JavaScript from main

node_modules/p-each-series/index.d.ts

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+declare const pEachSeries: {
+	/**
+	Iterate over promises serially.
+
+	@param input - Iterated over serially in the `iterator` function.
+	@param iterator - Return value is ignored unless it's `Promise`, then it's awaited before continuing with the next iteration.
+	@returns A `Promise` that fulfills when all promises in `input` and ones returned from `iterator` are fulfilled, or rejects if any of the promises reject. The fulfillment value is the original `input`.
+
+	@example
+	```
+	import pEachSeries = require('p-each-series');
+
+	const keywords = [
+		getTopKeyword(), //=> Promise
+		'rainbow',
+		'pony'
+	];
+
+	const iterator = async element => saveToDiskPromise(element);
+
+	(async () => {
+		console.log(await pEachSeries(keywords, iterator));
+		//=> ['unicorn', 'rainbow', 'pony']
+	})();
+	```
+	*/
+	<ValueType>(
+		input: Iterable<PromiseLike<ValueType> | ValueType>,
+		iterator: (element: ValueType, index: number) => unknown
+	): Promise<ValueType[]>;
+
+	// TODO: Remove this for the next major release, refactor the whole definition to:
+	// declare function pEachSeries<ValueType>(
+	// 	input: Iterable<PromiseLike<ValueType> | ValueType>,
+	// 	iterator: (element: ValueType, index: number) => unknown
+	// ): Promise<ValueType[]>;
+	// export = pEachSeries;
+	default: typeof pEachSeries;
+};
+
+export = pEachSeries;