Use @cap-js/openapi instead of @sap/cds-dk (#134)

Also test w/ Node 22

.github/workflows/node.js.yml

@@ -13,7 +13,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [20.x, 18.x]
+        node-version: [22.x, 20.x, 18.x]
 
     steps:
     - uses: actions/checkout@v4

.npmrc

@@ -1 +1,2 @@
 registry=https://registry.npmjs.org/
+@sap:registry=https://registry.npmjs.org/

CHANGELOG.md

@@ -6,6 +6,12 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 
 The format is based on [Keep a Changelog](http://keepachangelog.com/).
 
+## Version 0.9.0 - 2024-07-15
+
+### Changed
+
+- Use `@cap-js/openapi` instead of `@sap/cds-dk`, leading to lighter dependencies
+
 ## Version 0.8.0 - 2024-01-18
 
 ### Added

lib/middleware.js

@@ -1,4 +1,5 @@
-const cds = requireCdsOpenAPI()
+const cds = require('@sap/cds')
+const openapi = require('@cap-js/openapi')
 const debug = cds.debug('swagger')
 
 const swaggerUi = require('swagger-ui-express')
@@ -36,7 +37,7 @@ module.exports = (options={}, swaggerUiOptions={}) => {
 const cache = {}
 function toOpenApiDoc (service, options = {}) {
   if (!cache[service.name]) {
-    cache[service.name] = cds.compile.to.openapi(service.model, {
+    cache[service.name] = openapi.compile(service.model, {
       service: service.name,
       'odata-version': options.odataVersion,
       'openapi:url': join('/', options.apiPath, service.path),
@@ -56,24 +57,6 @@ function addLinkToIndexHtml (service, apiPath) {
   service.$linkProviders ? service.$linkProviders.push(provider) : service.$linkProviders = [provider]
 }
 
-/**
- * Loads the compile.to.openapi function from @sap/cds-dk or throws an error if not installed.
- * Will get simpler in the future when we have a dedicated openapi plugin.
- *
- * @returns { import('@sap/cds-dk') }
- */
-function requireCdsOpenAPI () {
-  try {
-    return require('@sap/cds-dk')
-  } catch (err) {
-    const cds = require('@sap/cds')
-    if (!cds.compile.to.openapi) {
-      throw new Error(`'@sap/cds-dk' is not installed. Add it as a (dev) dependency to use this plugin`, { cause: err })
-    }
-    return cds
-  }
-}
-
 /**
  * @typedef {Object} CdsSwaggerOptions
  * @property {string} basePath - the root path to mount the middleware on