The issue of importing images in Angular2 using TypeScript with Express is causing problems for Webpack

Question

The issue of importing images in Angular2 using TypeScript with Express is causing problems for Webpack

Having trouble importing images in my headercomponent.ts file. I believe the issue lies in how I am compiling the TypeScript with webpack ts loader, as it works fine with React (where the components are written in es6).

The error occurs at:

//headercomponent.ts
import {Component, View} from "angular2/core";
import {ROUTER_DIRECTIVES, Router} from "angular2/router";
import {AuthService} from "../../services/auth/auth.service";
import logoSource from "../../images/logo.png"; //**THIS CAUSES ERROR**  Cannot find module '../../images/logo.png'

@Component({
    selector: 'my-header',
    //templateUrl:'components/header/header.tmpl.html' ,
    template: `<header class="main-header">
  <div class="top-bar">
    <div class="top-bar-title">
      <a href="/"><img src="{{logoSource}}"></a>
    </div>

Here is my webpack configuration:

// webpack.config.js
'use strict';

var path = require('path');
var autoprefixer = require('autoprefixer');
var webpack = require('webpack');
var ExtractTextPlugin = require('extract-text-webpack-plugin');
var basePath = path.join(__dirname,'public');
//const TARGET = process.env.npm_lifecycle_event;
console.log("bp " + basePath)
module.exports = {
  entry: path.join(basePath,'/components/boot/boot.ts'),
  output: {
    path: path.join(basePath,"..","/build"), // This is where images AND js will go
    publicPath: path.join(basePath,"..","/build/assets"),
   // publicPath: path.join(basePath ,'/images'), // This is used to generate URLs to e.g. images
    filename: 'bundle.js'
  },
  plugins: [
    new ExtractTextPlugin("bundle.css")
  ],
  module: {
    preLoaders: [ { test: /\.tsx$/, loader: "tslint" } ],
    //
    loaders: [
      { test: /\.(png!jpg)$/, loader: 'file-loader?name=/img/[name].[ext]'  }, // inline base64 for <=8k images, direct URLs for the rest
      {
        test: /\.json/,
        loader: 'json-loader',
      },
      {
        test: /\.ts$/,
        loader: 'ts-loader',
        exclude: [/node_modules/]
      },
      {
        test: /\.js$/,
        loader: 'babel-loader'
      },
      {
        test: /\.scss$/,
        exclude: [/node_modules/],
        loader: ExtractTextPlugin.extract("style", "css!postcss!sass?outputStyle=expanded")
      },
      // fonts and svg
      { test: /\.woff(\?v=\d+\.\d+\.\d+)?$/, loader: "url-loader?limit=10000&mimetype=application/font-woff" },
      { test: /\.woff2(\?v=\d+\.\d+\.\d+)?$/, loader: "url-loader?limit=10000&mimetype=application/font-woff" },
      { test: /\.ttf(\?v=\d+\.\d+\.\d+)?$/, loader: "url-loader?limit=10000&mimetype=application/octet-stream" },
      { test: /\.eot(\?v=\d+\.\d+\.\d+)?$/, loader: "file" },
      { test: /\.svg(\?v=\d+\.\d+\.\d+)?$/, loader: "url-loader?limit=10000&mimetype=image/svg+xml" }
    ]
  },
  resolve: {
    // now require('file') instead of require('file.coffee')
    extensions: ['', '.ts', '.webpack.js', '.web.js', '.js', '.json', 'es6', 'png']
  },
  devtool: 'source-map'
};

My directory structure is as follows:

-/
 -server/
 -build/
 -node-modules/
 -public/
  -components/
   -boot/
    -boot.component.ts
   -header/
    -header.component.ts
  -images/
   -logo.png
  -services/
-typings/
 -browser/
 -main/
 -browser.d.ts
 -main.d.ts
-tsconfig.json
-typings.json

Here is my tsconfig file:

 //tsconfig.json
     {
      "compilerOptions": {
        "target": "es5",
        "sourceMap": true,
        "emitDecoratorMetadata": true,
        "experimentalDecorators": true,
        "removeComments": false,
        "noImplicitAny": false
      },
      "exclude": [
        "node_modules"
      ]
    }

I have a feeling the issue lies in the TypeScript compilation, but I'm not exactly sure what it could be.

express typescript angular webpack urlloader

Answer 1

Answer №1

If you're facing an issue where TypeScript modules and Webpack modules are getting mixed up, it's important to understand the distinction between them.

When you import a file in Webpack, it goes through a build pipeline specific to Webpack.

However, in TypeScript, only .ts and .js files are considered relevant. If you try to import a file like file.png, TypeScript won't know how to handle it because it doesn't rely on Webpack configuration.

To resolve this, you should segregate the usage of import from for TypeScript/EcmaScript code and require for Webpack-specific code.

To ensure that TypeScript ignores Webpack's require syntax, you can create a definition in a .d.ts file like this:

declare function require(string): string;

By doing this, TypeScript will ignore require statements, allowing Webpack to process them correctly during the build process.

Answer 2

If you're facing an issue where TypeScript modules and Webpack modules are getting mixed up, it's important to understand the distinction between them.

When you import a file in Webpack, it goes through a build pipeline specific to Webpack.

However, in TypeScript, only .ts and .js files are considered relevant. If you try to import a file like file.png, TypeScript won't know how to handle it because it doesn't rely on Webpack configuration.

To resolve this, you should segregate the usage of import from for TypeScript/EcmaScript code and require for Webpack-specific code.

To ensure that TypeScript ignores Webpack's require syntax, you can create a definition in a .d.ts file like this:

declare function require(string): string;

By doing this, TypeScript will ignore require statements, allowing Webpack to process them correctly during the build process.

Answer 3

Answer №2

Rather than using:

import image from 'pathToImage/image.extension';

Opt for:

const image = require('pathToImage/image.extension');

Answer 4

Rather than using:

import image from 'pathToImage/image.extension';

Opt for:

const image = require('pathToImage/image.extension');

Answer 5

Answer №3

Currently, I am utilizing the following code snippet:

import * as myImage from 'path/of/my/image.png';

In addition, I have generated a typescript definition using the following syntax:

declare module "*.png" {
    const value: any;
    export = value;
}

It is important to note that this setup is dependent on having a suitable handler, such as the file-loader in webpack, in place. This handler is crucial as it provides you with the necessary file path.

Answer 6

Currently, I am utilizing the following code snippet:

import * as myImage from 'path/of/my/image.png';

In addition, I have generated a typescript definition using the following syntax:

declare module "*.png" {
    const value: any;
    export = value;
}

It is important to note that this setup is dependent on having a suitable handler, such as the file-loader in webpack, in place. This handler is crucial as it provides you with the necessary file path.

Answer 7

Answer №4

An enhancement to Christian Stornowski's solution could involve setting the export as default:

declare module "*.png" {
  const imagePath: string;
  export default imagePath;
}

This allows you to import an image like this:

import myImage from 'img/myImage.png';

Answer 8

An enhancement to Christian Stornowski's solution could involve setting the export as default:

declare module "*.png" {
  const imagePath: string;
  export default imagePath;
}

This allows you to import an image like this:

import myImage from 'img/myImage.png';

Answer 9

Answer №5

When faced with a similar issue, I resolved it using the following method:

import * as myPicture from 'path/of/my/picture';

Within my component, I simply stored the imported image in a data member;

export class ImageComponent{
    public myImage = myPicture;
}

Then, I utilized it in the template like so:

<img [src]="myImage" alt="description here">

Answer 10

When faced with a similar issue, I resolved it using the following method:

import * as myPicture from 'path/of/my/picture';

Within my component, I simply stored the imported image in a data member;

export class ImageComponent{
    public myImage = myPicture;
}

Then, I utilized it in the template like so:

<img [src]="myImage" alt="description here">

Answer 11

Answer №6

To utilize the ES6 syntax for importing, follow these steps:

Firstly, double-check that your tsconfig.json file includes:

target: 'es5',
module: 'es6'

After ensuring the above, you can proceed to use the following syntax:

import MyImage from './images/my-image.png';

Answer 12

To utilize the ES6 syntax for importing, follow these steps:

Firstly, double-check that your tsconfig.json file includes:

target: 'es5',
module: 'es6'

After ensuring the above, you can proceed to use the following syntax:

import MyImage from './images/my-image.png';

Answer 13

Answer №7

If you want to be able to import default like this:

import happyDog from '../assets/happy_dog.jpg';

You need to define a module declaration for jpg:

declare module "*.jpg" {
const value: string;
  export default value;
}

Also, in your tsconfig, make sure to use "module": "es6" (refer to @vedran's comment above) or if you are using "module": "commonjs", add "esModuleInterop": true,

  "compilerOptions": {
    "module": "commonjs",
    "target": "es5",
    "esModuleInterop": true,
...

Reference: https://github.com/TypeStrong/ts-loader/issues/344#issuecomment-381398818

Answer 14

If you want to be able to import default like this:

import happyDog from '../assets/happy_dog.jpg';

You need to define a module declaration for jpg:

declare module "*.jpg" {
const value: string;
  export default value;
}

Also, in your tsconfig, make sure to use "module": "es6" (refer to @vedran's comment above) or if you are using "module": "commonjs", add "esModuleInterop": true,

  "compilerOptions": {
    "module": "commonjs",
    "target": "es5",
    "esModuleInterop": true,
...

Reference: https://github.com/TypeStrong/ts-loader/issues/344#issuecomment-381398818

The issue of importing images in Angular2 using TypeScript with Express is causing problems for Webpack

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

Answer №6

Answer №7

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