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node_modules/p-map/index.js

@@ -0,0 +1,81 @@
+'use strict';
+const AggregateError = require('aggregate-error');
+
+module.exports = async (
+	iterable,
+	mapper,
+	{
+		concurrency = Infinity,
+		stopOnError = true
+	} = {}
+) => {
+	return new Promise((resolve, reject) => {
+		if (typeof mapper !== 'function') {
+			throw new TypeError('Mapper function is required');
+		}
+
+		if (!(typeof concurrency === 'number' && concurrency >= 1)) {
+			throw new TypeError(`Expected \`concurrency\` to be a number from 1 and up, got \`${concurrency}\` (${typeof concurrency})`);
+		}
+
+		const ret = [];
+		const errors = [];
+		const iterator = iterable[Symbol.iterator]();
+		let isRejected = false;
+		let isIterableDone = false;
+		let resolvingCount = 0;
+		let currentIndex = 0;
+
+		const next = () => {
+			if (isRejected) {
+				return;
+			}
+
+			const nextItem = iterator.next();
+			const i = currentIndex;
+			currentIndex++;
+
+			if (nextItem.done) {
+				isIterableDone = true;
+
+				if (resolvingCount === 0) {
+					if (!stopOnError && errors.length !== 0) {
+						reject(new AggregateError(errors));
+					} else {
+						resolve(ret);
+					}
+				}
+
+				return;
+			}
+
+			resolvingCount++;
+
+			(async () => {
+				try {
+					const element = await nextItem.value;
+					ret[i] = await mapper(element, i);
+					resolvingCount--;
+					next();
+				} catch (error) {
+					if (stopOnError) {
+						isRejected = true;
+						reject(error);
+					} else {
+						errors.push(error);
+						resolvingCount--;
+						next();
+					}
+				}
+			})();
+		};
+
+		for (let i = 0; i < concurrency; i++) {
+			next();
+
+			if (isIterableDone) {
+				break;
+			}
+		}
+	});
+};