Utilizing Webpack 2 to import ES6 modules without default exports in UMD format

I'm currently facing an issue with importing UMD libraries using Webpack 2 and ts-loader. Previously, I had no problems when utilizing Webpack 1 and Rollup (without TypeScript). However, in Webpack 2, it seems to add .default when calling imported functions.

Here's an example:

import canvg from 'canvg';
canvg();

This code now transforms into:

var canvg_1 = require("canvg");
canvg_1.default();

Resulting in the error 

Uncaught TypeError: canvg_1.default is not a function
.

Any suggestions on how to resolve this issue?

javascripttypescriptwebpackes6-modulests-loader

Answer №1

The issue lay in the TypeScript configuration. I made a modification by including module: 'es2015' in my tsconfig.json, which solved the problem. Additionally, setting 

allowSyntheticDefaultImports: true
could also be beneficial in certain scenarios (though it wasn't necessary for me; there is some similarity with babel-plugin-add-module-exports as mentioned by @alejandro-garcia-anglada).

{
    "compilerOptions": {
        "module": "es2015",
        "allowSyntheticDefaultImports": true
    }
}

Answer №2

To ensure smooth functionality, consider utilizing the babel-plugin-add-module-exports.

Access the package here

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