Can’t compile TypeScript; requires Webpack 4

[martinbean]

• Laravel Mix Version: 2.1.11
• Node Version: 8.9.4
• NPM Version: 5.6.0
• OS: Windows

Description:

Brand new Laravel project. Trying to compile a JavaScript file using TypeScript. Throws the following error:

ERROR in ./resources/assets/js/src/order.ts
Module build failed: Error: You may be using an old version of webpack; please check you're using at least version 4
    at successfulTypeScriptInstance (C:\Users\MartinBean\Developer\TypeScriptTest\node_modules\ts-loader\dist\instances.js:168:15)
    at Object.getTypeScriptInstance (C:\Users\MartinBean\Developer\TypeScriptTest\node_modules\ts-loader\dist\instances.js:51:12)
    at Object.loader (C:\Users\MartinBean\Developer\TypeScriptTest\node_modules\ts-loader\dist\index.js:16:41)
 @ ./resources/assets/js/app.js 1:0-32
 @ multi ./resources/assets/js/app.js ./resources/assets/sass/app.scss

Steps To Reproduce:

1. Create a brand new Laravel project (composer create-project laravel/laravel).
2. Add a tsconfig.json file with the following contents:

{
    "include": [
        "resources/assets/js/**/*"
    ]
}

3. Try to compile JavaScript file as TypeScript: mix.ts('resources/assets/js/app.js', 'public/js')
4. Receive error about needing webpack 4.

I don’t think I’ve ever got TypeScript to compile successfully. It would be good if the Mix documentation could be updated with the minimum options needed to get TypeScript to compile successfully.

[ankurk91]

TypeStrong/ts-loader#786

[ankurk91]

You should be using ts-loader v3.5, update your package.json

Right now laravel-mix does not support webpack 4

[martinbean]

@ankurk91 Thank you.

[arcanedev-maroc]

Hi @JeffreyWay, is there any way to specify the version of the typescript's dependencies (at this line) ?

Otherwise, upgrading webpack to v4 may solve the issue

Cheers