feat: automate client version number dumps

package.json

@@ -31,7 +31,8 @@
     "start": "ts-node --transpile-only --pretty src",
     "test": "jest --testPathIgnorePatterns test/integration/ ",
     "test:integration": "jest test/integration/ --setupFiles dotenv/config",
-    "test:watch": "jest --watchAll"
+    "test:watch": "jest --watchAll",
+    "postversion": "ts-node --transpile-only --pretty utils/bump-version.ts"
   },
   "types": "lib/index.d.ts",
   "dependencies": {

src/constants.ts

@@ -0,0 +1,4 @@
+/**
+ * The version value is automatically replaced during builds.
+ */
+export const USER_AGENT = '@scaleleap/selling-partner-api-sdk/0.0.0'

src/helpers/api-client-helpers.ts

@@ -1,6 +1,7 @@
 import { aws4Interceptor } from 'aws4-axios'
 import globalAxios, { AxiosError, AxiosInstance, AxiosResponse } from 'axios'
 
+import { USER_AGENT } from '../constants'
 import { APIConfigurationParameters } from '../types'
 import { apiErrorFactory } from './api-error-factory'
 
@@ -16,8 +17,7 @@ export class ApiClientHelpers {
 
       axiosInstance = globalAxios.create({
         headers: {
-          // TODO: automate version number
-          'user-agent': '@scaleleap/selling-partner-api-sdk (Language=TypeScript/0.0.0)',
+          'user-agent': USER_AGENT,
           'x-amz-access-token': accessToken,
         },
       })

utils/bump-version.ts

@@ -0,0 +1,20 @@
+/**
+ * Syncs package.json version with constants file for release.
+ *
+ * Triggered inside `postversion` hook in package.json.
+ *
+ * See: https://semantic-release.gitbook.io/semantic-release/support/faq#how-can-i-use-a-npm-build-script-that-requires-the-package-jsons-version
+ */
+
+import { readFileSync, writeFileSync } from 'fs'
+import path from 'path'
+
+import { name, version } from '../package.json'
+import { USER_AGENT } from '../src/constants'
+
+const CONSTANTS_FILE = path.join(__dirname, '../lib/constants.js')
+
+const constants = readFileSync(CONSTANTS_FILE, { encoding: 'utf8' })
+const replaced = constants.replace(USER_AGENT, `${name}/${version}`)
+
+writeFileSync(CONSTANTS_FILE, replaced, { encoding: 'utf8' })