{
	"id": "171349",
	"key": "TIMOB-25883",
	"fields": {
		"issuetype": {
			"id": "1",
			"description": "A problem which impairs or prevents the functions of the product.",
			"name": "Bug",
			"subtask": false
		},
		"project": {
			"id": "10153",
			"key": "TIMOB",
			"name": "Titanium SDK/CLI",
			"projectCategory": {
				"id": "10100",
				"description": "Titanium and related SDKs used in application development",
				"name": "Client"
			}
		},
		"fixVersions": [
			{
				"id": "20115",
				"name": "Release 7.3.0",
				"archived": false,
				"released": true,
				"releaseDate": "2018-08-17"
			}
		],
		"resolution": {
			"id": "1",
			"description": "A fix for this issue is checked into the tree and tested.",
			"name": "Fixed"
		},
		"resolutiondate": "2018-05-01T13:38:07.000+0000",
		"created": "2018-03-19T18:42:23.000+0000",
		"priority": {
			"name": "High",
			"id": "2"
		},
		"labels": [
			"async.js",
			"hyperloop",
			"ios"
		],
		"versions": [
			{
				"id": "19957",
				"description": "",
				"name": "Release 7.1.0",
				"archived": false,
				"released": true,
				"releaseDate": "2018-03-14"
			},
			{
				"id": "19975",
				"name": "Hyperloop 3.1.0",
				"archived": false,
				"released": true
			}
		],
		"issuelinks": [],
		"assignee": {
			"name": "cwilliams",
			"key": "cwilliams",
			"displayName": "Christopher Williams",
			"active": true,
			"timeZone": "America/New_York"
		},
		"updated": "2018-07-11T22:43:39.000+0000",
		"status": {
			"description": "The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.",
			"name": "Closed",
			"id": "6",
			"statusCategory": {
				"id": 3,
				"key": "done",
				"colorName": "green",
				"name": "Done"
			}
		},
		"components": [
			{
				"id": "13715",
				"name": "Hyperloop",
				"description": "Hyperloop project"
			},
			{
				"id": "10206",
				"name": "iOS",
				"description": "iOS Platform"
			}
		],
		"description": "(Only seen on iOS)\r\n\r\nWhen trying to build our hyperloop-examples sample app, the {{Callback was already called.}} error is thrown. It seems to be an issue thrown from the {{async}} library we use. There are [reports|https://stackoverflow.com/a/27521528/5537752] that see this happening when errors are not guarded inside parallel callback flows, so thats where we need to dig into it. \r\n\r\n*EDIT*:\r\nHere is a log:\r\n{code}\r\n[DEBUG] Copying and minifying /Users/hknoechel/Documents/Apps/hyperloop-examples/Resources/iphone/alloy/controllers/BaseController.js => /Users/hknoechel/Documents/Apps/hyperloop-examples/build/iphone/build/Products/Debug-iphonesimulator/Hyperloop_Sample.app/alloy/controllers/BaseController.js\r\n[TRACE] Checking require for: /alloy\r\n[TRACE] Checking import for: uikit/uialertcontroller\r\n[TRACE] Checking import for: uikit/uialertaction\r\n[TRACE] Checking import for: uikit/uikit\r\n[TRACE] Checking import for: titanium/tiapp\r\n[DEBUG] Writing /Users/hknoechel/Documents/Apps/hyperloop-examples/build/iphone/build/Products/Debug-iphonesimulator/Hyperloop_Sample.app/alloy/controllers/alert.js\r\n[DEBUG] Copying and minifying /Users/hknoechel/Documents/Apps/hyperloop-examples/Resources/iphone/alloy/controllers/alert.js => /Users/hknoechel/Documents/Apps/hyperloop-examples/build/iphone/build/Products/Debug-iphonesimulator/Hyperloop_Sample.app/alloy/controllers/alert.js\r\n[TRACE] Checking require for: /alloy\r\n[TRACE] Checking import for: uikit/uiview\r\n[TRACE] Checking import for: uikit/uicolor\r\n[TRACE] Checking import for: coregraphics/coregraphics\r\n[DEBUG] Writing /Users/hknoechel/Documents/Apps/hyperloop-examples/build/iphone/build/Products/Debug-iphonesimulator/Hyperloop_Sample.app/alloy/controllers/animateview.js\r\n[DEBUG] Copying and minifying /Users/hknoechel/Documents/Apps/hyperloop-examples/Resources/iphone/alloy/controllers/animateview.js => /Users/hknoechel/Documents/Apps/hyperloop-examples/build/iphone/build/Products/Debug-iphonesimulator/Hyperloop_Sample.app/alloy/controllers/animateview.js\r\n[TRACE] Checking require for: /alloy\r\n[TRACE] Checking import for: uikit/uilabel\r\n[TRACE] Checking import for: uikit/uicolor\r\n[TRACE] Checking import for: uikit/uiscreen\r\n[TRACE] Checking import for: uikit/uiview\r\n[TRACE] Checking import for: uikit/nslayoutconstraint\r\n[TRACE] Checking import for: uikit/uikit\r\n[DEBUG] Writing /Users/hknoechel/Documents/Apps/hyperloop-examples/build/iphone/build/Products/Debug-iphonesimulator/Hyperloop_Sample.app/alloy/controllers/autolayout.js\r\n[DEBUG] Copying and minifying /Users/hknoechel/Documents/Apps/hyperloop-examples/Resources/iphone/alloy/controllers/autolayout.js => /Users/hknoechel/Documents/Apps/hyperloop-examples/build/iphone/build/Products/Debug-iphonesimulator/Hyperloop_Sample.app/alloy/controllers/autolayout.js\r\n[TRACE] Checking require for: /alloy\r\n[TRACE] Checking import for: corelocation/clbeaconregion\r\n[TRACE] Checking import for: corelocation/cllocationmanager\r\n[TRACE] Checking import for: corelocation/corelocation\r\n[TRACE] Checking import for: uikit/uiapplication\r\n[TRACE] Checking import for: uikit/uilocalnotification\r\n[TRACE] Checking import for: foundation/nsuuid\r\n[TRACE] Checking require for: subclasses/locationmanagerdelegate\r\n[DEBUG] Writing /Users/hknoechel/Documents/Apps/hyperloop-examples/build/iphone/build/Products/Debug-iphonesimulator/Hyperloop_Sample.app/alloy/controllers/beacons.js\r\n[DEBUG] Copying and minifying /Users/hknoechel/Documents/Apps/hyperloop-examples/Resources/iphone/alloy/controllers/beacons.js => /Users/hknoechel/Documents/Apps/hyperloop-examples/build/iphone/build/Products/Debug-iphonesimulator/Hyperloop_Sample.app/alloy/controllers/beacons.js\r\n[TRACE] Checking require for: /alloy\r\n[TRACE] Checking import for: uikit/uiview\r\n[TRACE] Checking import for: uikit/uicolor\r\n[TRACE] Checking import for: uikit/uiblureffect\r\n[TRACE] Checking import for: uikit/uivisualeffectview\r\n[TRACE] Checking import for: uikit/uikit\r\n[TRACE] Checking import for: coregraphics/coregraphics\r\n[DEBUG] Writing /Users/hknoechel/Documents/Apps/hyperloop-examples/build/iphone/build/Products/Debug-iphonesimulator/Hyperloop_Sample.app/alloy/controllers/blur.js\r\n[ERROR] Callback was already called.\r\n{code}\r\nI looks like a race condition between our build-hooks and only seems to happen with the 3.1.0 build from the [Hyperloop ES6 PR|https://github.com/appcelerator/hyperloop.next/pull/270] so far, so it may be related.\r\n\r\n*Update*! It seems to be caused by a {{const}} vs. {{let}} issue! I remember the compiler detects that different, so maybe its handled different when being used in Hyperloop code? Maybe we need to return somewhere in order to handle the error in a different layer. Lowing the priority ...\r\n\r\nExample:\r\n{code:js}\r\nconst screenRect = UIScreen.mainScreen.bounds;\r\nscreenRect = CGRectMake(0, 0, UIScreen.mainScreen.bounds.size.width, UIScreen.mainScreen.bounds.size.height - 64);\r\n{code}\r\n",
		"attachment": [],
		"flagged": false,
		"summary": "\"Callback was already called.\" error thrown when source contains syntax error and transpiling",
		"creator": {
			"name": "hknoechel",
			"key": "hansknoechel",
			"displayName": "Hans Knöchel",
			"active": true,
			"timeZone": "Europe/Berlin"
		},
		"subtasks": [],
		"reporter": {
			"name": "hknoechel",
			"key": "hansknoechel",
			"displayName": "Hans Knöchel",
			"active": true,
			"timeZone": "Europe/Berlin"
		},
		"environment": "Hyperloop 3.1.0\r\niOS 11\r\nExample: \"HTTP Request\"",
		"comment": {
			"comments": [
				{
					"id": "436046",
					"author": {
						"name": "cwilliams",
						"key": "cwilliams",
						"displayName": "Christopher Williams",
						"active": true,
						"timeZone": "America/New_York"
					},
					"body": "https://github.com/appcelerator/titanium_mobile/pull/9969",
					"updateAuthor": {
						"name": "cwilliams",
						"key": "cwilliams",
						"displayName": "Christopher Williams",
						"active": true,
						"timeZone": "America/New_York"
					},
					"created": "2018-03-28T18:45:02.000+0000",
					"updated": "2018-03-28T18:45:02.000+0000"
				},
				{
					"id": "439136",
					"author": {
						"name": "hknoechel",
						"key": "hansknoechel",
						"displayName": "Hans Knöchel",
						"active": true,
						"timeZone": "Europe/Berlin"
					},
					"body": "Test-Case:\r\n1. Create  new app\r\n2. Add the following at the top (or anywhere else) in your code: \r\n{code:js}\r\nconst a = 1;\r\na = 2;\r\n{code}\r\nExpected behavior: The build should fail with the error: \"a\" is read-only.",
					"updateAuthor": {
						"name": "hknoechel",
						"key": "hansknoechel",
						"displayName": "Hans Knöchel",
						"active": true,
						"timeZone": "Europe/Berlin"
					},
					"created": "2018-07-11T19:21:36.000+0000",
					"updated": "2018-07-11T19:21:36.000+0000"
				},
				{
					"id": "439144",
					"author": {
						"name": "ewieber",
						"key": "ewieber",
						"displayName": "Eric Wieber",
						"active": false,
						"timeZone": "America/Los_Angeles"
					},
					"body": "Verified fixed and changes are in SDKs 7.3.0.v20180711122153 & 7.4.0.v20180711095209",
					"updateAuthor": {
						"name": "ewieber",
						"key": "ewieber",
						"displayName": "Eric Wieber",
						"active": false,
						"timeZone": "America/Los_Angeles"
					},
					"created": "2018-07-11T22:43:39.000+0000",
					"updated": "2018-07-11T22:43:39.000+0000"
				}
			],
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}