feat: make result for config --volumes command type safe

src/index.ts

@@ -31,6 +31,10 @@ export type DockerComposeConfigServicesResult = {
   services: string[]
 }
 
+export type DockerComposeConfigVolumesResult = {
+  volumes: string[]
+}
+
 export interface IDockerComposeLogOptions extends IDockerComposeOptions {
   follow?: boolean
 }
@@ -335,10 +339,20 @@ export const configServices = async function (
   }
 }
 
-export const configVolumes = function (
+export const configVolumes = async function (
   options?: IDockerComposeOptions
-): Promise<IDockerComposeResult> {
+): Promise<TypedDockerComposeResult<DockerComposeConfigVolumesResult>> {
-  return execCompose('config', ['--volumes'], options)
+  try {
+    const result = await execCompose('config', ['--volumes'], options)
+    const nonEmpty = (v: string) => v !== ''
+    const volumes = result.out.split('\n').filter(nonEmpty)
+    return {
+      ...result,
+      data: { volumes }
+    }
+  } catch (error) {
+    return Promise.reject(error)
+  }
 }
 
 export const ps = function (

test/docker-compose-42.yml

@@ -5,7 +5,7 @@ services:
     image: nginx:1.19.9-alpine
     command: 'nginx -g "daemon off;"'
     volumes:
-      - ./volume:/mountedvolume
+      # - ./volume:/mountedvolume
       - db-data:/mountedsecondvolume
 
 volumes:

test/index.test.ts

@@ -540,8 +540,9 @@ test('config show data for docker-compose files (volumes)', async (): Promise<vo
     config: 'docker-compose-42.yml'
   })
 
+  expect(std.data.volumes.length).toBe(1)
+  expect(std.data.volumes[0]).toBe('db-data')
   expect(std.err).toBeFalsy()
-  expect(std.out.includes('db-data')).toBeTruthy()
 })
 
 test('ps shows status data for started containers', async (): Promise<void> => {