G3 is now using RXJS version 7 which makes it possible for the CLI to also be updated to RXJS 7.
NB: this change does not remove all usages of the deprecated APIs.
Closes#24371
These async methods are a replacement for the Observable based `runSchematicAsync` and `runExternalSchematicAsync` methods.
DEPRECATED:
The Observable based `SchematicTestRunner.runSchematicAsync` and `SchematicTestRunner.runExternalSchematicAsync` method have been deprecated in favor of the Promise based `SchematicTestRunner.runSchematic` and `SchematicTestRunner.runExternalSchematic`.
BREAKING CHANGE:
With this change we remove the following deprecated APIs
- `TslintFixTask`
- `TslintFixTaskOptions`
**Note:** this only effects schematics developers.
BREAKING CHANGE
Deprecated `SchematicTestRunner.runSchematic` and `SchematicTestRunner.runExternalSchematic` have been removed. Use `SchematicTestRunner.runSchematicAsync` or `SchematicTestRunner.runExternalSchematicAsync` instead.
Note: this change only effects direct `@angular-devkit/schematics` users and not the application developers.
All schematics can potentially be async. The synchronous test method variants (`runSchematic`/`runExternalSchematic`) will fail if the schematic, any of its rules, or any schematic it calls are async.
