How do I manage 'for' loops in TypeScript while using the 'import * as' syntax?

When working with TypeScript, I encountered an issue while trying to import and iterate over all modules from a file. The compiler throws an error at build time. Can anyone help me figure out the correct settings or syntax to resolve this?

import * as dependencies from './dependencies';

for (const key in dependencies) {
  console.log(dependencies[key]());
}

The compiler produces the following error during build:

error TS7053: Element implicitly has an 'any' type because expression of type 'string' can't be used to index type 'typeof import("/src/dependencies/index")'.
  No index signature with a parameter of type 'string' was found on type 'typeof import("/src/dependencies/index")'. 

tsconfig.json

{
   "compilerOptions": {
    "allowJs": true,
    "allowSyntheticDefaultImports": true,
    "jsx": "react",
    ...
    ... [configuration details]
    ...
    "isolatedModules": true
  },
  "exclude": ["node_modules"],
  "include": ["**/*.ts"]
}

EDIT:

To work around this issue, I'm implementing the following workaround which seems redundant.

import * as dependencies from './dependencies';

interface Collection {
  [key: string]: any;
}

const dependencyCollection: Collection = dependencies;

for (const key in dependencyCollection) {
  console.log(dependencyCollection[key]());
}

Answer №1

Instead of using a standard for loop, consider utilizing Object.values to transform it into an Iterable/Array which can then be iterated over with a for-of loop

import * as dependencies from './dependencies';

for (const dependency of Object.values(dependencies)) {
  console.log(dependency());
}

If you require both the export name and the value, you can use Object.entries instead

import * as dependencies from './dependencies';

for (const [key, dependency] of Object.entries(dependencies)) {
  console.log(key, dependency());
}

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