CODEWITHSUNDEEP
javascriptnode.jsangulartypescript
undefined
undefined

Reputation: 2129

Can't do a default import in Angular 9

I changed tsconfig.json by adding this properties

"esModuleInterop": true, "allowSyntheticDefaultImports": true,

in order to be able to import a npm package import * as ms from "ms";

But I still get this error 

This module is declared with using 'export =', and can only be used with a default import when using the 'allowSyntheticDefaultImports' flag.

What am I missing?

Update:

If I change with import ms from "ms", then it works fine with the compiler but not with VSCode linter and the error is

 can only be default-imported using the 'allowSyntheticDefaultImports' flagts(1259)
index.d.ts(25, 1): This module is declared with using 'export =', and can only be used with a default import when using the 'allowSyntheticDefaultImports' flag.

As I said now is working but VSCode have a problem.

Upvotes: 68

Views: 116541

Answers (8)

Ashrik Ahamed
Ashrik Ahamed

Reputation: 455

I solved this by adding "allowSyntheticDefaultImports": true to tsconfig.json

And you must save the changes by running this command line in the terminal:

tsc --p tsconfig.json

Upvotes: 2

Omid Farvid
Omid Farvid

Reputation: 831

could be fixed by putting

export default

instead of

export =

Upvotes: 0

Timileyin Oluwayomi
Timileyin Oluwayomi

Reputation: 367

it works perfectly importing all from the package module example :

import * as CryptoJS from 'crypto-js';

if this doesnt work make sure you are have successfully installed the package type

Upvotes: 4

Mark
Mark

Reputation: 380

If you have this error trying to import localforage into angular 9, I used this (Angular 9.1.12, Typescript 3.9.6):

npm install localforage

// tsconfig.json

{
  "compileOnSave": false,
  "compilerOptions": {
    "baseUrl": "./",
    "outDir": "./dist/out-tsc",
    "sourceMap": true,
    "declaration": false,
    "downlevelIteration": true,
    "experimentalDecorators": true,
    "module": "esnext",
    "moduleResolution": "node",
    "importHelpers": true,
    "target": "es2015",
    "lib": [
      "es2018",
      "dom"
    ]
  },
  "angularCompilerOptions": {
    "fullTemplateTypeCheck": true,
    "strictInjectionParameters": true,
    "esModuleInterop": true, <----------------------------add this
    "allowSyntheticDefaultImports": true <----------------------------and this
  },
}

// any component or service

import * as localforage from 'localforage';

constructor() {
    localforage.setItem('localforage', 'localforage value');
    setTimeout(() => {
      localforage.getItem('localforage').then((e) => {
       console.log(e);
      });
    }, 5000);
    setTimeout( async () => {
      const RES = await localforage.getItem('localforage');
      console.log('RES', RES);
    }, 10000);
  }

Upvotes: 26

PokatilovArt
PokatilovArt

Reputation: 1390

"allowSyntheticDefaultImports": true

This flag solved problem, but it should be added to compilerOptions section of tsconfig.json

Upvotes: 92

user7077707
user7077707

Reputation: 95

Having the error message

This module is declared with using 'export =', and can only be used with a default import when using the 'allowSyntheticDefaultImports' flag.

on a typescript import rule for an Angular component :

import { something } from 'amodule';

in node_modules/@types/amodule/index.d.ts, I found this code :

declare module 'amodule' {
   export = something;
}

and changed it to :

declare module 'amodule' {
    export default something;
}

the import rule in the angular component was changed to :

 import something from 'amodule';

and the error message is gone and the imported module can be used as expected.

Upvotes: 1

Ever Dev
Ever Dev

Reputation: 2162

You can just do something like this

import * as printJS from 'print-js'

Upvotes: 58

Lucas Sousa
Lucas Sousa

Reputation: 411

The problem is how the package declared the export, you can still import using the default import:

import ms from "ms";

Upvotes: 4

Related Questions