Issue
I'm learning Typescript, and I have followed a tutorial using it with and express api app verbatim but I get the following error:
D:\Development\Node\Ed\TypeScript\src\app.ts:5
const app: Application = express();
^
TypeError: express_1.default is not a function
at Object.<anonymous> (D:\Development\Node\Ed\TypeScript\src\app.ts:5:33)
at Module._compile (internal/modules/cjs/loader.js:689:30)
at Module.m._compile (D:\Development\Node\Ed\TypeScript\node_modules\ts-node\src\index.ts:814:23)
at Module._extensions..js (internal/modules/cjs/loader.js:700:10)
at Object.require.extensions.(anonymous function) [as .ts] (D:\Development\Node\Ed\TypeScript\node_modules\ts-node\src\index.ts:817:12)
at Module.load (internal/modules/cjs/loader.js:599:32)
at tryModuleLoad (internal/modules/cjs/loader.js:538:12)
at Function.Module._load (internal/modules/cjs/loader.js:530:3)
at Function.Module.runMain (internal/modules/cjs/loader.js:742:12)
at main (D:\Development\Node\Ed\TypeScript\node_modules\ts-node\src\bin.ts:226:14)
I have no idea how to fix and would appreciate any directions
app.ts file:
import express, { Application, Request, Response, NextFunction } from 'express';
const app: Application = express();
app.get('/', (req: Request, res: Response, next: NextFunction) => {
res.send('hello');
});
app.listen(5000, () => console.log('Server running'));
tsconfig.json:
{
"compilerOptions": {
"target": "es6", /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', or 'ESNEXT'. */
"module": "commonjs", /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */
"outDir": "./dist", /* Redirect output structure to the directory. */
"rootDir": "./src", /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */
"removeComments": true, /* Do not emit comments to output. */
"moduleResolution": "node", /* Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6). */
"allowSyntheticDefaultImports": true, /* Allow default imports from modules with no default export. This does not affect code emit, just typechecking. */
}
}
Solution
You need change the way you have imported the files. It should be:
import * as express from "express";
import { Application, Request, Response, NextFunction } from 'express';
Answered By - Ankita Kuchhadiya
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