[typescript-angular] Support rxjs 6

[Fredx87]

Description

The import of Observable in rxjs 6 is changed from previous versions. The typescript-angular generator should support the new version

Swagger-codegen version

3.0.2

Suggest a fix/enhancement

Taking any definition, the created services imports rxjs in this way:

import { Observable }                                        from 'rxjs/Observable';

With rxjs 6, the correct way to import Observable is:

import { Observable }                                        from 'rxjs';

This should be supported with a specific configuration flag, or when ngVersion is greater than 6.

[britvik]

This has already been fixed and merged into master, but sadly it didn't make it to the v3.
887afa8#diff-5bdae26ba753c4986ceb5af35bada047

[andrewryan1906]

Any update on when this might get merged to master?

[MikeKovetsky]

Please take a look at the issue. This does not let me remove rxjs-compat from dependencies.
Moreover, this will become a bigger problem after rxjs-compat deprecation.

[dennisameling]

For swagger-codegen >=3.0.0

The PR that @britvik mentioned is indeed in the master branch only (<3.0.0). I've created a separate issue for the 3.0.0 branch (in the swagger-codegen-generators repo) to get these commits to the 3.0.0+ version as well.

For swagger-codegen <3.0.0

Please be aware that the default Angular build still runs for Angular 4.3.0 (see TypeScriptAngularClientCodegen.java):

SemVer ngVersion;
if (additionalProperties.containsKey(NG_VERSION)) {
   ngVersion = new SemVer(additionalProperties.get(NG_VERSION).toString());
} else {
   ngVersion = new SemVer("4.3.0");
   LOGGER.info("generating code for Angular {} ...", ngVersion);
   LOGGER.info("  (you can select the angular version by setting the additionalProperty ngVersion)");
}

You can run the build script for Angular 6 with the --additional-properties ngVersion=6 command:

Linux:

java -jar modules/swagger-codegen-cli/target/swagger-codegen-cli.jar generate \
   -i http://petstore.swagger.io/v2/swagger.json \
   -l typescript-angular \
   -o /var/tmp/angular_api_client \
   --additional-properties ngVersion=6

Windows:

java -jar modules\swagger-codegen-cli\target\swagger-codegen-cli.jar generate -i http://petstore.swagger.io/v2/swagger.json -l typescript-angular -o c:\temp\angular_api_client --additional-properties ngVersion=6