Compilation error when using *ngFor to iterate over unions of arrays of arrays of string literals #49310
Closed as not planned
Description
Which @angular/* package(s) are the source of the bug?
core
Is this a regression?
No
Description
Using the *ngFor directive, It is impossible to iterate over a variable of type union of arrays of arrays of string literals without obtaining a compilation error, even though it is valid TypeScript.
Please provide a link to a minimal reproduction of the bug
https://stackblitz.com/edit/angular-7hhamp?file=src/main.ts
Please provide the exception or error you saw
Error in src/main.ts (16:36)
Type 'FooBar' is not assignable to type 'NgIterable<Foo[]>'.
Please provide the environment you discovered this bug in (run ng version)
Angular CLI: 12.2.18
Node: 16.19.0 (Unsupported)
Package Manager: npm 8.19.3
OS: linux x64
Angular: 12.2.17
... animations, common, compiler, compiler-cli, core, forms
... language-service, platform-browser, platform-browser-dynamic
... router
Package Version
---------------------------------------------------------
@angular-devkit/architect 0.1202.18
@angular-devkit/build-angular 12.2.18
@angular-devkit/core 12.2.18
@angular-devkit/schematics 12.2.18
@angular/cdk 12.2.13
@angular/cli 12.2.18
@angular/material 12.2.13
@schematics/angular 12.2.18
rxjs 6.6.7
typescript
Anything else?
No response