https://www.example.com/typescript-dynamic-import
Can Typescript handle dynamically setting the import path into a variable?
For example, can we transform this:
import {HomeComponent} from './dashboard/home/home.component';
Into something like this:
let componentPath = './dashboard/home/home.component';
import * from componentPath;
import featureAn intriguing proposal for dynamic importing in ECMAScript can be found here.
Starting from TypeScript 2.4, developers have access to dynamic import expressions, as shown below:
async function getZipFile(name: string, files: File[]): Promise<File> {
const zipUtil = await import('./utils/create-zip-file');
const zipContents = await zipUtil.getAsBlob(files);
return new File(zipContents, name);
}
When used as a function, the import keyword returns a promise that can be awaited.
import / exportThe limitations of using the ES6 syntax for modules are highlighted by the inability to achieve dynamic imports due to its inherently static nature.
As explained in the article ES6 In Depth: Modules:
In comparison to its dynamic counterparts, JavaScript's module system is surprisingly rigid and static.
- Imports and exports must occur at the top level of a module, without conditional constructs or within function scopes.
- All exported identifiers need to be explicitly declared in the source code, preventing programmatically exporting names based on data.
- Module objects are immutable, disallowing modifications post-definition.
- All dependencies must be loaded upfront before any module execution, lacking lazy loading capabilities.
- No error handling mechanism is present for import failures, potentially halting an application if any module encounters an issue during loading.
- Modules lack pre-loading hooks, limiting control over dependency loading processes.
Using the import function, you can pass dynamically created strings instead of string literals.
However, keep in mind that this will return a Promise and should be executed within an async function rather than at the top of the file.
For example:
async main(): Promise<void> {
const myData = await import(`../../data/${environment.theme}/chapters`);
console.log({ myData });
}
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