Is it possible to import a type definition independently from a module import?

I'm trying to understand the relationship between type definitions (from Definitely Typed) and the actual module import process.

For instance, let's consider the ECharts library. It offers various versions from its dist directory. Once you run npm install echarts, it includes files like:

node_modules/echarts/dist/echarts.js
node_modules/echarts/dist/echarts.min.js
node_modules/echarts/dist/echarts-en.js
node_modules/echarts/dist/echarts-en.min.js
...

If you also install @types/echarts, you can then import it using:

import * as echarts from "echarts";

This method works effectively in terms of both resulting JavaScript and type definitions. However, since the original library is in Chinese, a common solution is to switch to importing the English version (echarts-en) which utilizes the same functionality but with an English language file. This change can be made by importing:

import * as echarts from "echarts/dist/echarts-en";

The resultant JavaScript will work correctly and now display in English. Yet, TypeScript compiler may raise an error stating that there are no type definitions for this specific import:

Could not find a declaration file for module 'echarts/dist/echarts-en'. '/home/<user>/<path>/node_modules/echarts/dist/echarts-en.js' implicitly has an 'any' type.
  Try `npm install @types/echarts` if it exists or add a new declaration (.d.ts) file containing `declare module 'echarts/dist/echarts-en';

Simply installing @types/echarts does not always solve this issue. How can I instruct TypeScript to import the module from "echarts/dist/echarts-en" while still utilizing the type definitions connected to the "echarts" import?

typescriptecharts

Answer №1

To maintain the original import definitions for the echarts module in your TypeScript file:

import * as echarts from "echarts";

The process of path remapping from echarts to 

node_modules/echarts/dist/echarts-en.js
should be handled by a bundling tool.

For instance, using Webpack, you can create an alias in the webpack.config.js under the resolve section:

module.exports = {
  //...
  resolve: {
    alias: {
      echarts$: path.resolve(__dirname, 'node_modules/echarts/dist/echarts-en')
    }
  }
};

This will redirect the 

import * as echarts from "echarts"
statement to echarts-en.js in your bundled file without impacting TypeScript intellisense.

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