Webpacker/Typescript is unable to locate a file within the Rails asset pipeline

I'm currently experiencing difficulty importing a file from the rails asset pipeline as webpack seems to be unable to locate it.

Here is the content of my tsconfig.json:

{
  "compilerOptions": {
    "declaration": false,
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "lib": ["es6", "dom"],
    "module": "es6",
    "moduleResolution": "node",
    "sourceMap": true,
    "target": "es5",
    "baseUrl": ".",
    "paths": {
      "@images/*": ["app/assets/images/*"],
    }
  },
  "exclude": [
    "**/*.spec.ts",
    "node_modules",
    "vendor",
    "public"
  ],
  "compileOnSave": false
}

This is the content of my config/webpack/environment.js:

const { environment } = require('@rails/webpacker')
const customConfig = require('./custom');
const typescript =  require('./loaders/typescript')
const fileLoader = require('./loaders/file');

environment.loaders.append('file', fileLoader)
environment.loaders.append('typescript', typescript)

// Merge custom config
environment.config.merge(customConfig);

module.exports = environment

My config/webpack/custom.js looks like this:

const path = require('path');

module.exports = {
  resolve: {
    alias: {
      '@src': path.resolve(__dirname, '..', '..', 'app/javascript'),
      '@images': path.resolve(__dirname, '..', '..', 'app/assets/images'),
      '@components': '@src/components',
      React: 'react',
      ReactDOM: 'react-dom'
    }
  }
};

import "@images/ajax-circle.gif";
in one of my typescript files is triggering error 2307 (module resolution failure) and webpack-dev-server is unable to compile due to the following error:

ERROR in /Users/brandoncc/dev/my_app/app/javascript/lib/store_management.ts
[tsl] ERROR in /Users/brandoncc/dev/my_app/app/javascript/lib/store_management.ts(1,24)
      TS2307: Cannot find module '@images/ajax-circle.gif'.
webpack: Failed to compile.

It appears that typescript is struggling to locate the file, and I am struggling to identify the root cause of this issue.

Answer №1

After some trial and error, I discovered that the key was to include a definition for the .gif file format.

I resolved this issue by generating a file named typings.d.ts containing:

declare module "*.gif";

This simple addition solved the problem.

Answer №2

When utilizing the typescript paths functionality, it is essential to incorporate the tsconfig-paths-webpack-plugin to ensure accurate path resolution. Simply include it in your webpack configuration.

const TsconfigPathsPlugin = require('tsconfig-paths-webpack-plugin');

module.exports = {
  ...
  resolve: {
    plugins: [new TsconfigPathsPlugin({ /*configFile: "./path/to/tsconfig.json" */ })]
  }
  ...
}

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