jordanbtuckerJ
Deno•2y ago
jordanbtucker

Default export has no call signatures

I'm trying to import the default export from 
npm:@feathersjs/express
, but Deno complains that the default export has no call signatures.

// main.ts
import express from "npm:@feathersjs/express";
const app = express();


$ deno check main.ts
error: TS2349 [ERROR]: This expression is not callable.
  Type 'typeof import("file:///.../node_modules/.deno/@feathersjs+express@5.0.26/node_modules/@feathersjs/express/lib/index.d.ts")' has no call signatures.
const app = express();
            ~~~~~~~


However, running 
main.ts
 works without issue.

The referenced 
index.d.ts
 contains this:

export default function feathersExpress<S = any, C = any>(feathersApp?: FeathersApplication<S, C>, expressApp?: Express): Application<S, C>;


So Deno should see its default export.

The strange thing is that the following works when checking the file and running it.

import express from "npm:@feathersjs/express";
const app = express.default();
//                  ^^^^^^^


And the following check returns 
true
:

console.log(express === express.default); // true


So why doesn't Deno like it when I use 
express()
 instead of 
express.default()
?
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Default export has no call signatures - Deno