To Reproduce error

From repo root:

npm install
dotnet tool restore
dotnet paket install
npm start or dotnet fable src --noCache

The error output:

> dotnet fable src --noCache
Fable: F# to JS compiler 3.7.20
Thanks to the contributor! @Neftedollar
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Parsing src\App.fsproj...
src> cmd /C dotnet restore App.fsproj -p:FABLE_COMPILER=true
  Determining projects to restore...
  Paket version 7.2.0+bb14ab674b2748070a624f394cd6796e11aaffa8
  The last full restore is still up to date. Nothing left to do.
  Total time taken: 0 milliseconds
  Paket version 7.2.0+bb14ab674b2748070a624f394cd6796e11aaffa8
  Restoring C:\Repos\minimal-fable\src\App.fsproj
  Starting restore process.
  Total time taken: 0 milliseconds
  Restored C:\Repos\minimal-fable\src\App.fsproj (in 257 ms).
Project and references (1 source files) parsed in 7401ms

Started Fable compilation...
Fable compilation finished in 1993ms

.\src\App.fs(5,6): (5,13) error FSHARP: The namespace or module 'Browser' is not defined. (code 39)
.\src\App.fs(11,16): (11,24) error FSHARP: The value, namespace, type or module 'document' is not defined. (code 39)
.\src\App.fs(11,57): (11,64) error FSHARP: The namespace or module 'Browser' is not defined. (code 39)
.\src\App.fs(14,1): (14,17) error FSHARP: Lookup on object of indeterminate type based on information prior to this program point. A type annotation may be needed prior to this program point to constrain the type of the object. This may allow the lookup to be resolved. (code 72)
Compilation failed

Fable Minimal App

This is a small Fable app project so you can easily get started and add your own code progressively. For more comprehensive templates check this page.

Requirements

dotnet SDK 5.0 or higher
node.js
An F# editor like Visual Studio, Visual Studio Code with Ionide or JetBrains Rider

Building and running the app

Install dependencies: npm install
Start the compiler in watch mode and a development server: npm start
After the first compilation is finished, in your browser open: http://localhost:8080/

Any modification you do to the F# code will be reflected in the web page after saving.

Note: check the "scripts" section in package.json to see the commands triggered by the steps above.

Bundling for release

Run the following command to compile and bundle up all your F# code into one Javascript file: npm run build. The compiled output ends up in the public folder under the name bundle.js.

Project structure

npm

JS dependencies are declared in package.json, while package-lock.json is a lock file automatically generated.

Webpack

Webpack is a JS bundler with extensions, like a static dev server that enables hot reloading on code changes. Configuration for Webpack is defined in the webpack.config.js file. Note this sample only includes basic Webpack configuration for development mode, if you want to see a more comprehensive configuration check the Fable webpack-config-template.

F#

The sample only contains two F# files: the project (.fsproj) and a source file (.fs) in the src folder.

Web assets

The index.html file and other assets like an icon can be found in the public folder.

BrunoZell/minimal-fable