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Today I Learned

How to import images in Typescript

Normally, when Typescript cannot find something we get this error:

Cannot find module [your module] or its corresponding type declarations ts(2307)

Now let's see how we can fix this, with a simple example. Given the following folder structure:

│── src
│   ├── resources
│   │   ├── ts
│   │   │   ├── **/*.ts
│   │   ├── images
│   │   │   ├── logo.svg
├── ...
├── tsconfig.json

In order to be able to achieve something like this:

import Logo from '[path]/images/logo.svg'

without any ** Typescript errors**, we need to follow these steps:

1.Make sure that the images folder is "reachable" by Typescript.

Adding this inside tsconfig.json will do the trick:

{
  "include": [
        ...
        "resources/**/*.ts",
   ],
}

A configuration like this one will not do:

{
  "include": [
      "resources/ts/**/*.ts",
   ],
}

Because images/ is not included in ts/ and we don't have any other folders declared, so Typescript can't "reach" it.

2.Let Typescript know about the .svg type in that folder.

In the root of the images folder create a file called index.d.ts:

...
├── resources
│   ├── ts
│   │   ├── **/*.ts
│   ├── images
│   │   ├── logo.svg
│   │   ├── index.d.ts
...

With the following contents:

declare module '*.svg' {
  const value: any;
  export = value;
}

Now you should be good to go.