How to create Angular 9 project with IVY? - project

Question

How to create Angular 9 project with IVY?
I tried the following:
ng new sample9prjivy --enable-ivy
My environment:
Angular CLI: 9.0.2
Node: 12.16.0
OS: win32 x64
Angular:
...
Ivy Workspace:
Package and Version
#angular-devkit/architect 0.900.2
#angular-devkit/core 9.0.2
#angular-devkit/schematics 9.0.2
#schematics/angular 9.0.2
#schematics/update 0.900.2
rxjs 6.5.3
C:\src\Angular\pilot\A9>ng new sample9prjivy --enable-ivy
Unknown option: '--enable-ivy'
What I missed?

Answer 1

As an earlier poster tried to explain, there's no such "ng new" flag as --enable-ivy.
As andrewjames explained above, the "ivy" tag is incorrect. You want "angular-ivy". I fixed it for you.
If you want to enable Ivy for older Angular builds, read this thread: How do I enable Ivy for Angular 8 or 9?. You'll need to edit tsconfig.json and angular.json.
It looks like Ivy is now the default for Angular 9:
https://angular.io/guide/ivy
Ivy is the code name for Angular's next-generation compilation and
rendering
pipeline.
With the version 9 release of Angular, the new compiler and runtime
instructions are used by default instead of the older compiler and
runtime, known as View Engine.
As the documentation discusses, there IS a flag for enableIvy ... but it's set in tsconfig.app.json. It is NOT a command line option for "ng new".
Update:
The answer to the OP's original question: you don't have to "create an Angular 9 project with Ivy": in Angular 9, Ivy should be enabled by default.
To answer the follow-on question about NG6002: look here (already cited below):
https://github.com/angular/angular/issues/35399
https://github.com/angular/angular/pull/35191
One final suggestion: it couldn't hurt to:
Update Angular: ng update #angular/cli #angular/core
Create a brand new project and copy the old source into the new project
Another Update
Original problem: ng new sample9prjivy --enable-ivy =>
Unknown option: '--enable-ivy'
Cause: --enable-ivy simply isn't a legal "ng" option with Angular 9. Don't do it!
Next problem: I always got more error NG6002
This is a well-known issue upgrading existing projects to Angular 9. Look here and here. The basic issue is that "upgrading" the project can result in "inconsistencies". Both links suggest workarounds; I've also suggested some workarounds. I don't know if you've tried any of them yet :(
CURRENT SUGGESTION:
Since you don't seem to be making much progress, I'd suggest the following:
a) UNINSTALL Angular: get a "clean version":
npm uninstall -g #angular/cli
npm cache clean
npm cache verify
npm install -g #angular/cli
b) Confirm your "clean install" of Angular 9:
ng --version
...
Angular CLI: 9.0.3
Node: 10.15.1
OS: win32 x64
Angular:
...
Ivy Workspace:
Package Version
------------------------------------------------------
#angular-devkit/architect 0.900.3
#angular-devkit/core 9.0.3
#angular-devkit/schematics 9.0.3
#schematics/angular 9.0.3
#schematics/update 0.900.3
rxjs 6.5.3
c) Create a brand new project with your "known good" Angular install.
Do NOT change ANY configuration! Do NOT try to explicitly "enable Ivy"!
d) Copy over your old source code (ONLY the project source code!) to your new project.
e) Verify that "everything works".
f) Post back what you find.