ng update should have removed tslint setting no-use-before-declare

[johnpapa]

🐞 Bug report

Command (mark with an x)

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

Description

I ran ng update to v9. Then I ran npm run lint. I received this error

▶npm run lint

> heroes-angular@0.0.0 lint /Users/papa/_git/heroes-angular
> ng lint

Linting "heroes-angular"...
no-use-before-declare is deprecated. Since TypeScript 2.9. Please use the built-in compiler checks instead.
All files pass linting.

It seems I had a legacy setting in tslint.json for "no-use-before-declare": true,

It would be great if the ng update removed any deprecated tslint settings.

[dgp1130]

@mgechev, what is the current status of ESLint? If we're hoping to move towards that in the future, we'll need to decide how much support we want to give TSLint for the time being.

[mgechev]

We're still in a process of evaluation. There are some performance concerns.

[dgp1130]

Since we'll still be support TSLint for the foreseeable future, we already need a migration to upgrade to TSLint 6.1. We can remove no-use-before-declare in that migration. This will need to be run manually in v9.x when it is ready, but will run automatically in v10 (assuming we don't migrate to ESLint by then).

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