Fix #377 ExpressReceiver's RespondFn implementation doesn't accept a string

src/ExpressReceiver.spec.ts

@@ -14,6 +14,8 @@ import ExpressReceiver, {
  verifySignatureAndParseBody,
 } from './ExpressReceiver';
 
+import { RespondArguments } from './types/utilities';
+
 describe('ExpressReceiver', () => {
 
  const noopLogger: Logger = {
@@ -379,4 +381,18 @@ describe('ExpressReceiver', () => {
 
  });
 
+ // Just copied the implementation as the method is private and it's a bit hard to write a unit test
+ describe('RespondFn implementation', () => {
+ it('should work with both a string and a RespondArguments', () => {
+ const respond = (response: string | RespondArguments): void => {
+ const validResponse: RespondArguments =
+ (typeof response === 'string') ? { text: response } : response;
+ assert.equal(validResponse.text, 'hello');
+ };
+ respond('hello');
+ respond({ text: 'hello' });
+ respond({ text: 'hello', blocks: [] });
+ });
+ });
+
 });

src/ExpressReceiver.ts

@@ -10,6 +10,7 @@ import crypto from 'crypto';
 import tsscmp from 'tsscmp';
 import { ErrorCode, errorWithCode } from './errors';
 import { Logger, ConsoleLogger } from '@slack/logger';
+import { RespondArguments } from './types/utilities';
 
 // TODO: we throw away the key names for endpoints, so maybe we should use this interface. is it better for migrations?
 // if that's the reason, let's document that with a comment.
@@ -101,8 +102,10 @@ export default class ExpressReceiver extends EventEmitter implements Receiver {
  };
 
  if (req.body && req.body.response_url) {
- event.respond = (response): void => {
- this.axios.post(req.body.response_url, response)
+ event.respond = (response: string | RespondArguments): void => {
+ const validResponse: RespondArguments =
+ (typeof response === 'string') ? { text: response } : response;
+ this.axios.post(req.body.response_url, validResponse)
  .catch((e) => {
  this.emit('error', e);
  });