Different tslint typedef behavior between migration and generation

[Bored-Bohr]

🐞 Bug report

Command (mark with an x)

• new
• build
• serve
• test
• e2e
• generate
• add
• update
• lint
• xi18n
• run
• config
• help
• version
• doc

Description

When migrating from Angular 9 using ng update @angular/core @angular/cli the typedef rule is not added to tslint.json.
When generating a new project in Angular 10, the typedef rule is added.

It seems that typedef should be added with Angular 10 #17821

🔬 Minimal Reproduction

Migration

1. Install Angular CLI 9: npm i -g @angular/cli@v9-lts
2. Generate Angular 9: ng new <project_name>
3. cd <project_name>
4. Update to Angular 10: ng update @angular/core @angular/cli

Generation

1. Install Angular CLI 9: npm i -g @angular/cli@latest
2. Generate Angular 10: ng new <project_name>

Check difference in tslint.json

🌍 Your Environment

Angular CLI: 9.1.12
Node: 12.18.3
OS: win32 x64

Angular CLI: 10.0.5
Node: 12.18.3
OS: win32 x64

Anything else relevant?

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