feat: support relative paths when generating rest handlers (#268)

src/model/generateRestHandlers.ts

@@ -31,8 +31,9 @@ type RequestParams<Key extends PrimaryKeyType> = {
 
 export function createUrlBuilder(baseUrl?: string) {
   return (path: string) => {
-    const url = new URL(path, baseUrl || 'http://localhost')
-    return baseUrl ? url.toString() : url.pathname
+    // For the previous implementation trailing slash didn't matter, we must keep it this way for backward compatibility
+    const normalizedBaseUrl = baseUrl && baseUrl.slice(-1) === '/' ? baseUrl.slice(0, -1) : baseUrl || '';
+    return `${normalizedBaseUrl}/${path}`
   }
 }
 

test/utils/generateRestHandlers.test.ts

@@ -1,5 +1,5 @@
 import { response, restContext } from 'msw'
-import { primaryKey } from '../..'
+import { primaryKey } from '../../src'
 import { ModelDefinition } from '../../src/glossary'
 import {
   OperationError,
@@ -15,12 +15,22 @@ import {
 describe('createUrlBuilder', () => {
   it('builds a relative URL given no base URL', () => {
     const buildUrl = createUrlBuilder()
-    expect(buildUrl('/users')).toEqual('/users')
+    expect(buildUrl('users')).toEqual('/users')
+  })
+
+  it('builds a relative URL given a prefix as a base URL', () => {
+    const buildUrl = createUrlBuilder('/api/v1')
+    expect(buildUrl('users')).toEqual('/api/v1/users')
   })
 
   it('builds an absolute URL given a base URL', () => {
     const buildUrl = createUrlBuilder('https://example.com')
-    expect(buildUrl('/users')).toEqual('https://example.com/users')
+    expect(buildUrl('users')).toEqual('https://example.com/users')
+  })
+
+  it('builds an absolute URL given a base URL with trailing slash', () => {
+    const buildUrl = createUrlBuilder('https://example.com/')
+    expect(buildUrl('users')).toEqual('https://example.com/users')
   })
 })