TypeError: "not a constructor" when using TypeScript

[danbockapps]

I get this error when using the example code at the top of index.d.ts:

Users-MacBook-Pro:twitter-lite-test danbock$ ts-node dev.ts 

/Users/danbock/code/twitter-lite-test/dev.ts:3
const twitter = new Twitter({
                ^
TypeError: twitter_lite_1.Twitter is not a constructor
    at Object.<anonymous> (/Users/danbock/code/twitter-lite-test/dev.ts:3:17)
    at Module._compile (internal/modules/cjs/loader.js:1156:30)
    at Module.m._compile (/Users/danbock/.nvm/versions/node/v12.16.2/lib/node_modules/ts-node/src/index.ts:836:23)
    at Module._extensions..js (internal/modules/cjs/loader.js:1176:10)
    at Object.require.extensions.<computed> [as .ts] (/Users/danbock/.nvm/versions/node/v12.16.2/lib/node_modules/ts-node/src/index.ts:839:12)
    at Module.load (internal/modules/cjs/loader.js:1000:32)
    at Function.Module._load (internal/modules/cjs/loader.js:899:14)
    at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:74:12)
    at main (/Users/danbock/.nvm/versions/node/v12.16.2/lib/node_modules/ts-node/src/bin.ts:226:14)
    at Object.<anonymous> (/Users/danbock/.nvm/versions/node/v12.16.2/lib/node_modules/ts-node/src/bin.ts:485:3)

I reproduced this on a blank project. Just ran npm install twitter-lite and copied this code into a blank file and ran it using ts-node. Got the same error.

import { Twitter } from 'twitter-lite';

const twitter = new Twitter({
 consumer_key: 'XYZ',
 consumer_secret: 'XYZ',
 access_token_key: 'XYZ',
 access_token_secret: 'XYZ'
});

[AlberErre]

Same issue here 🤷🏻‍♂️

I've added // @ts-ignore above that line as a temporary workaround.

[danbockapps]

@AlberErre Above what line? I believe that TypeScript compilation is actually happening without errors, and the TypeError I'm seeing is a runtime JavaScript error.

[kyleratti]

@danbockapps I am seeing the same thing on typescript@^3.8.3 and twitter-lite@^0.10.1-0. I think this has to do with the typings exporting the entire namespace while the actual library exports the Twitter class.

I was a bit confused by the suggestion from @AlberErre as well, but I realized he meant he added // @ts-ignore above the client line like so:

import Twitter from "twitter-lite"; // typings and runtime OK for this line

...

// changing your import to match above will trigger 'This expression is not constructable.'
// the @ts-ignore flag will let TS compile anyway
// @ts-ignore
const twitter = new Twitter({
 consumer_key: 'XYZ',
 consumer_secret: 'XYZ',
 access_token_key: 'XYZ',
 access_token_secret: 'XYZ'
});

[danbockapps]

To be clear, there are two necessary changes from the sample code in the comment at the top of index.d.ts:

1. Remove the curly brackets from the import statement
2. Add // @ts-ignore above the call to create a new Twitter

In my blank project I also had to either add "esModuleInterop": true to the compilerOptions in tsconfig.json, or change the import statement to import * as Twitter from 'twitter-lite' Then the code ran.

[dylanirlbeck]

Hi all, sorry you're seeing these errors in TypeScript. We just added typings to the library, so there was bound to be some bugs 😄 That said, I'd encourage all of you to take a look to see if you can find the issue and open a PR!

I'm going to cc @fdebijl since he made the PR for types originally. I'm no TS expert so hopefully we can work together to get this fixed before the next release of twitter-lite.

[fdebijl]

I completely overlooked esModuleInterop while developing the typings, I'm submitting a PR with a fix as we speak.

Following this PR, the safe import signature (which will work without esModuleInterop) is

const Twitter = require('twitter-lite')

If esModuleInterop is enabled, you can also use the import ... from signature, optionally with typings:

import Twitter from 'twitter-lite';
import Twitter, { TwitterOptions, AccessTokenOptions } from 'twitter-lite';

Note that the const ... require signature doesn't allow you to import typings from twitter-lite, so I would recommend using esModuleInterop in any event.

[DalderupMaurice]

I've had this issue with version 1.1.0
Had to add esModuleInterop: true to fix the issue, without it gives the error

I assume this PR would fix that: #139