feat: Convert all app files to JS

packages/backend/src/apps/strava/auth/verify-credentials.js

@@ -0,0 +1,19 @@
+const verifyCredentials = async ($) => {
+  const params = {
+    client_id: $.auth.data.clientId,
+    client_secret: $.auth.data.clientSecret,
+    code: $.auth.data.code,
+    grant_type: 'authorization_code',
+  };
+  const { data } = await $.http.post('/v3/oauth/token', null, { params });
+
+  await $.auth.set({
+    accessToken: data.access_token,
+    refreshToken: data.refresh_token,
+    tokenType: data.token_type,
+    athleteId: data.athlete.id,
+    screenName: `${data.athlete.firstname} ${data.athlete.lastname}`,
+  });
+};
+
+export default verifyCredentials;