save code
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+9
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{
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"root": true,
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"extends": "@ljharb",
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"rules": {
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"no-new-func": 1,
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},
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}
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+9
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{
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"all": true,
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"check-coverage": false,
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"reporter": ["text-summary", "text", "html", "json"],
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"exclude": [
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"coverage",
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"test"
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]
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}
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+20
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The MIT License (MIT)
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Copyright (c) 2021 Jordan Harband
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Permission is hereby granted, free of charge, to any person obtaining a copy of
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this software and associated documentation files (the "Software"), to deal in
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the Software without restriction, including without limitation the rights to
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use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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the Software, and to permit persons to whom the Software is furnished to do so,
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subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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+32
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'use strict';
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var callBound = require('call-bound');
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var safeRegexTest = require('safe-regex-test');
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var toStr = callBound('Object.prototype.toString');
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var fnToStr = callBound('Function.prototype.toString');
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var isFnRegex = safeRegexTest(/^\s*async(?:\s+function(?:\s+|\()|\s*\()/);
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var hasToStringTag = require('has-tostringtag/shams')();
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var getProto = require('get-proto');
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var getAsyncFunc = require('async-function');
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/** @type {import('.')} */
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module.exports = function isAsyncFunction(fn) {
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if (typeof fn !== 'function') {
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return false;
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}
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if (isFnRegex(fnToStr(fn))) {
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return true;
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}
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if (!hasToStringTag) {
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var str = toStr(fn);
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return str === '[object AsyncFunction]';
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}
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if (!getProto) {
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return false;
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}
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var asyncFunc = getAsyncFunc();
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return asyncFunc && asyncFunc.prototype === getProto(fn);
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};
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+91
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'use strict';
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/* globals window */
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var test = require('tape');
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var isAsyncFunction = require('../index');
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var generatorFuncs = require('make-generator-function')();
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var asyncFuncs = require('make-async-function').list();
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var hasToStringTag = require('has-tostringtag/shams')();
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var forEach = require('for-each');
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test('returns false for non-functions', function (t) {
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var nonFuncs = [
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true,
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false,
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null,
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undefined,
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{},
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[],
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/a/g,
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'string',
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42,
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new Date()
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];
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t.plan(nonFuncs.length);
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forEach(nonFuncs, function (nonFunc) {
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t.notOk(isAsyncFunction(nonFunc), nonFunc + ' is not a function');
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});
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t.end();
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});
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test('returns false for non-async functions', function (t) {
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var func = function () {};
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t.notOk(isAsyncFunction(func), 'anonymous function is not an async function');
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var namedFunc = function foo() {};
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t.notOk(isAsyncFunction(namedFunc), 'named function is not an async function');
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if (typeof window === 'undefined') {
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t.skip('window.alert is not an async function');
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} else {
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t.notOk(isAsyncFunction(window.alert), 'window.alert is not an async function');
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}
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t.end();
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});
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var fakeToString = function () { return 'async function () { return "TOTALLY REAL I SWEAR!"; }'; };
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test('returns false for non-async function with faked toString', function (t) {
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var func = function () {};
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func.toString = fakeToString;
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t.notEqual(String(func), Function.prototype.toString.apply(func), 'faked toString is not real toString');
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t.notOk(isAsyncFunction(func), 'anonymous function with faked toString is not an async function');
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t.end();
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});
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test('returns false for generator functions', function (t) {
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if (generatorFuncs.length > 0) {
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forEach(generatorFuncs, function (generatorFunc) {
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t.notOk(isAsyncFunction(generatorFunc), generatorFunc + ' is not async function');
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});
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} else {
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t.skip('generator function is not async function - this environment does not support ES6 generator functions. Please use an engine that supports them.');
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}
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t.end();
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});
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test('returns false for non-async function with faked @@toStringTag', { skip: !hasToStringTag || asyncFuncs.length === 0 }, function (t) {
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var asyncFunc = asyncFuncs[0];
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/** @type {{ toString(): unknown; valueOf(): unknown; [Symbol.toStringTag]?: unknown }} */
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var fakeAsyncFunction = {
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toString: function () { return String(asyncFunc); },
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valueOf: function () { return asyncFunc; }
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};
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fakeAsyncFunction[Symbol.toStringTag] = 'AsyncFunction';
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t.notOk(isAsyncFunction(fakeAsyncFunction), 'fake AsyncFunction with @@toStringTag "AsyncFunction" is not an async function');
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t.end();
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});
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test('returns true for async functions', function (t) {
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if (asyncFuncs.length > 0) {
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forEach(asyncFuncs, function (asyncFunc) {
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t.ok(isAsyncFunction(asyncFunc), asyncFunc + ' is async function');
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});
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} else {
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t.skip('async function is async function - this environment does not support ES2018 async functions. Please use an engine that supports them.');
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}
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t.end();
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});
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