The dynamically loaded JavaScript file was unable to access the constructor, resulting in the error message "X is not a constructor."

Attempting to eliminate the use of import statements and instead dynamically load Javascript files using a specific class.

This particular class is used for this purpose:

export function JSImport<T>(
    importPromise: Promise<T>,
): Promise<T> {
    // CommonJS's `module.exports` is wrapped as `default` in ESModule.
    return importPromise.then((m: any) => (m.default || m) as T);
}

However, encountering an error when attempting to instantiate imported files with constructor parameters.

This is how it was previously done successfully:

declare let Tiff: any;
const tiff = new Tiff({buffer: xhr.response});

Here is the updated approach:

   const importTiff = JSImport(
    import(/* webpackChunkName: "Tiff" */ 'Tiff'),
    );



   try {
    importTiff.then((Tiff: any) => {
    const tiff = new Tiff({buffer: xhr.response});
    ....
    }

The new code results in a TypeError: Tiff is not a constructor

When looking at the Tiff variable in the Chrome console, it appears as shown in the following image: https://i.sstatic.net/UpcyR.png

How can I utilize it as a constructor?

Answer №1

Utilizing the webpack dynamic import feature by using

import(/* chunkNameHint */ "moduleName")
allows you to access a module referenced as generic T within your JSImport function:

export function JSImport<T>(
    importPromise: Promise<T>, // TypeScript deduces T as the result of the dynamic import, which is the complete module
): Promise<T>

Instead of attempting to automatically unpack the module (which could have default and/or named exports), you can directly utilize the dynamic import like this:

import(/* webpackChunkName: "Tiff" */ 'Tiff')
  .then((module) => module.default) // Assuming the module has a default export that is needed
  .then((Tiff: any) => {
    const tiff = new Tiff({buffer: xhr.response});
    // ....
   });

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