Tslint migration does not consider an extends property containing an array

🚀 Feature request

Command (mark with an x)

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

Description

Running ng update @angular/cli --migrate-only tslint-version-6

with a tslint config like this:

{
  "extends": [
    "tslint:recommended",
    "tslint-plugin-prettier",
    "tslint-config-prettier"
  ],
....

fails with

 tslint configuration does not extend "tslint:recommended".
    Migration will terminate as some rules might conflict.

The following file implements the migration. https://github.com/angular/angular-cli/blob/master/packages/schematics/angular/migrations/update-10/update-tslint.ts

Describe the solution you’d like

If you have a solution in mind, please describe it.

Describe alternatives you’ve considered

Have you considered any alternative solutions or workarounds?

[alan-agius4]

@sfabriece, there is already a PR for this: https://github.com/angular/angular-cli/pull/17323

Thanks anyways 🙂

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