[typescript-angular] Type Map is missing generic Arguments

Description

When generating the Code the entity-interfaces inside the module-directory have this property:

readonly context?: string | Map;

This line prevents "npm run build" from successfully executing because Map is missing two generic arguments
I have to add the arguments by hand like this:

readonly context?: string | Map<any, any>;

Swagger-codegen version

3.0.27 Current stable

Command line used for generation

java -jar swagger-codegen-cli.jar generate -i swagger.json -l typescript-angular

Steps to reproduce

I tried to reproduce this issue with the petstore.json but the generated code does not include the above mentioned property.
Attached is the swagger.json file I used.

Suggest a fix/enhancement

The Map-property should be generated with generic Arguments.

Start with the typescript-angular generator output for the supplied swagger.json and trace how the entity interfaces render the context property. Run the stated java -jar swagger-codegen-cli.jar generate command, then npm run build; done means the generated Map type includes generic arguments and the build succeeds.