Error message: TypeScript on the client-side shows an error stating that <object>.default is not a valid

I am currently working on a project that involves browser-side code written in TypeScript and transpiled to JavaScript using the following tsconfig settings:

{
  "compilerOptions": {
    "target": "es6",                                
    "sourceMap": true,       
    "outDir": "../www/",
    "rootDirs": ["./", "../src"],
    "module": "commonjs",
    "moduleResolution": "node",
    "skipLibCheck": true,
    "allowSyntheticDefaultImports": true       
  },
  "files": [
    "client.ts"
  ],
  "exclude": [
    "node_modules",
    "./node_modules",
    "./node_modules/*",
    "./node_modules/@types/node/index.d.ts",
  ]
}

Within the code, I utilize ApexCharts as shown below:

import ApexCharts from 'apexcharts';

[...]

deviceCard.chart = new ApexCharts(document.querySelector(`#${newCard.serial}chart`), options);
deviceCard.chart.render();

However, after transpiling the code with tsc, these lines transform into:

deviceCard.chart = new apexcharts_1.default(document.querySelector(`#${newCard.serial}chart`), options);
deviceCard.chart.render();

As I struggled to import ApexCharts from the node module to the browser, I resorted to downloading ApexCharts from , saving it locally, and bundling everything together with browserify.

Upon running the code in the browser, I encounter this error:

TypeError: apexcharts_1.default is not a constructor

Any suggestions on how to resolve this issue would be greatly appreciated. Thank you!

Answer №1

The solution to my problem was simple:

All I needed to do was include

"esModuleInterop": true
in my tsconfig.json file, like so:

{
  "compilerOptions": {
    "target": "es6",                                
    "sourceMap": true,       
    "outDir": "../www/",
    "rootDirs": ["./", "../src"],
    "module": "commonjs",
    "moduleResolution": "node",
    "skipLibCheck": true,
    "allowSyntheticDefaultImports": true,
    "esModuleInterop": true
  },
  "files": [
    "client.ts"
  ],
  "exclude": [
    "node_modules",
    "./node_modules",
    "./node_modules/*",
    "./node_modules/@types/node/index.d.ts",
  ]
}

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