🐞 bug report

Affected Package

The issue is caused by package zone.js

Maybe.

Is this a regression?

Actually angular is not broken, but a browser update broke the frameworks behavior.

It’s still working in all other browsers except Chrome 77.0.3865.90

Description

In Chrome 77.0.3865.90 in some case the following error is thrown for Promises around ReadableStream, WritableStream or TransformStream, but I couldn’t come up with a simple reproduction.

It was working fine until the most recent Chrome patch.

TypeError: Method Promise.prototype.then called on incompatible receiver [object Object]
    at ZoneAwarePromise.then (<anonymous>)

🔬 Minimal Reproduction

https://github.com/zaenk/chrome77-zonejs-promise-bug

Prereq: node 10 or 12, npm 3.11+, ng cli 8.3.5

• Clone the repo
• npm install
• ng serve
• Open localhost:4200 in an updated Chrome Stable channel (77.0.3865.90)
• F12 for console, observe the error message
• If it not breaks for the first time, give the dev server and the browser some restart

🔥 Exception or Error

TypeError: Method Promise.prototype.then called on incompatible receiver [object Object]
    at ZoneAwarePromise.then (<anonymous>)

🌍 Your Environment

Angular Version:

Package                           Version
-----------------------------------------------------------
@angular-devkit/architect         0.803.5
@angular-devkit/build-angular     0.803.5
@angular-devkit/build-optimizer   0.803.5
@angular-devkit/build-webpack     0.803.5
@angular-devkit/core              8.3.5
@angular-devkit/schematics        8.3.5
@angular/cli                      8.3.5
@ngtools/webpack                  8.3.5
@schematics/angular               8.3.5
@schematics/update                0.803.5
rxjs                              6.4.0
typescript                        3.5.3
webpack                           4.39.2

Anything else relevant?

Browser version

Code that throwing this error is working in:

• Chrome 76
• Chrome 78 (Beta)
• Chrome 79 (Canary)
• Firefox 68
• Firefox 69
• Edge 18
• Edge 78 (Dev)
• Also might have worked in 77.0.3865.75, but I cannot tell this for sure

Other

• webpack package was not installed at top level node_modules with npm 6.8.x, installing 6.11.3 of npm fixed that

Edit:

• Here’s a fiddle with the working code without angular https://jsfiddle.net/by15stqh/4/
• I tried to debug this for hours, every place where this library uses await it returns a Promise, which always have the then override from zone. Every object being wrapped is a Promise https://github.com/angular/angular/blob/2e84f4e0cda5ee4d1c9dae0c5789c7225d7c94e5/packages/zone.js/lib/common/promise.ts#L474-L478
• Tried NgZone runOutsideAngular but the global promise is still modified by zone, so the result is the same
• Tried with zone.js 0.9.1 and 0.10.2, no difference