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@webwriter/code
Advanced tools
@webwriter/code
Write and run code as a code cell. Supports several languages (HTML, JavaScript/TypeScript, Python, Java, WebAssembly).
Code (@webwriter/code@3.0.2)
License: MIT | Version: 3.0.2
The Code Widget enables interactive code exercises directly in the browser. Users can effortlessly write, execute, and explore code in multiple programming languages, including:
- JavaScript or TypeScript
- HTML
- Python (powered by Pyodide)
- Java (powered by TeaVM)
- WebAssembly Text Format (WAT)
Features
- Intuitive Editor: Based on CodeMirror, offering syntax highlighting and optional autocompletion for a smoother coding experience.
- Line Locking: Allows instructors to lock specific lines, creating read-only templates to guide students effectively.
- Rich Output Display: Outputs appear neatly below each code cell, with JavaScript execution featuring a fully interactive console inspector.
- 100% Client-Side Execution: Everything executes locally within the browser, ensuring complete offline capability and no reliance on servers.
Development
To set up the development environment, clone the repository and execute the following commands:
npm install
npm run dev # runs @webwriter/build dev
Finally, import the code directory into WebWriter to begin.
Snippets
Snippets are examples and templates using the package's widgets.
| Name | Import Path |
|---|---|
| HTML | @webwriter/code/snippets/HTML.html |
CodeHTML (<webwriter-code-html>)
Code widget for HTML with live preview functionality.
Usage
Use with a CDN (e.g. jsdelivr):
<link href="https://cdn.jsdelivr.net/npm/@webwriter/code/widgets/webwriter-code-html.css" rel="stylesheet">
<script type="module" src="https://cdn.jsdelivr.net/npm/@webwriter/code/widgets/webwriter-code-html.js"></script>
<webwriter-code-html></webwriter-code-html>
Or use with a bundler (e.g. Vite):
npm install @webwriter/code
<link href="@webwriter/code/widgets/webwriter-code-html.css" rel="stylesheet">
<script type="module" src="@webwriter/code/widgets/webwriter-code-html.js"></script>
<webwriter-code-html></webwriter-code-html>
Fields
| Name (Attribute Name) | Type | Description | Default | Reflects |
|---|---|---|---|---|
code (code) | String | The source code content displayed in the editor. | - | ✓ |
visible (visible) | boolean | Whether the code editor is visible to the user. | true | ✓ |
autoRun (autoRun) | boolean | Whether to automatically run the code when the component is first loaded. | false | ✓ |
runnable (runnable) | boolean | Whether the code execution is allowed and the run button is enabled. | true | ✓ |
autocomplete (autocomplete) | boolean | Whether autocompletion is enabled in the code editor. | false | ✓ |
lockedLines (lockedLines) | number[] | Array of line numbers that should be locked from editing. | [] | ✓ |
showExecutionTime (showExecutionTime) | boolean | Whether to display the execution time in the controls. | false | ✓ |
executionTime (executionTime) | number | The execution time in milliseconds of the last code run. | 0 | ✓ |
showExecutionCount (showExecutionCount) | boolean | Whether to display the execution count in the run button. | false | ✓ |
executionCount (executionCount) | number | The number of times the code has been executed. | 0 | ✓ |
results (results) | any | The results from the last code execution. | [] | ✓ |
diagnostics (diagnostics) | Diagnostic[] | Compilation or runtime errors from the last code execution. | [] | ✓ |
Fields including properties and attributes define the current state of the widget and offer customization options.
Editing config
| Name | Value |
|---|
The editing config defines how explorable authoring tools such as WebWriter treat the widget.
No public methods, slots, events, custom CSS properties, or CSS parts.
CodeJavaScript (<webwriter-code-javascript>)
Code widget for JavaScript with execution capabilities.
Usage
Use with a CDN (e.g. jsdelivr):
<link href="https://cdn.jsdelivr.net/npm/@webwriter/code/widgets/webwriter-code-javascript.css" rel="stylesheet">
<script type="module" src="https://cdn.jsdelivr.net/npm/@webwriter/code/widgets/webwriter-code-javascript.js"></script>
<webwriter-code-javascript></webwriter-code-javascript>
Or use with a bundler (e.g. Vite):
npm install @webwriter/code
<link href="@webwriter/code/widgets/webwriter-code-javascript.css" rel="stylesheet">
<script type="module" src="@webwriter/code/widgets/webwriter-code-javascript.js"></script>
<webwriter-code-javascript></webwriter-code-javascript>
Fields
| Name (Attribute Name) | Type | Description | Default | Reflects |
|---|---|---|---|---|
code (code) | String | The source code content displayed in the editor. | - | ✓ |
visible (visible) | boolean | Whether the code editor is visible to the user. | true | ✓ |
autoRun (autoRun) | boolean | Whether to automatically run the code when the component is first loaded. | false | ✓ |
runnable (runnable) | boolean | Whether the code execution is allowed and the run button is enabled. | true | ✓ |
autocomplete (autocomplete) | boolean | Whether autocompletion is enabled in the code editor. | false | ✓ |
lockedLines (lockedLines) | number[] | Array of line numbers that should be locked from editing. | [] | ✓ |
showExecutionTime (showExecutionTime) | boolean | Whether to display the execution time in the controls. | false | ✓ |
executionTime (executionTime) | number | The execution time in milliseconds of the last code run. | 0 | ✓ |
showExecutionCount (showExecutionCount) | boolean | Whether to display the execution count in the run button. | false | ✓ |
executionCount (executionCount) | number | The number of times the code has been executed. | 0 | ✓ |
results (results) | any | The results from the last code execution. | [] | ✓ |
diagnostics (diagnostics) | Diagnostic[] | Compilation or runtime errors from the last code execution. | [] | ✓ |
Fields including properties and attributes define the current state of the widget and offer customization options.
Editing config
| Name | Value |
|---|
The editing config defines how explorable authoring tools such as WebWriter treat the widget.
No public methods, slots, events, custom CSS properties, or CSS parts.
CodeJava (<webwriter-code-java>)
Code widget for Java with compilation and execution capabilities using TeaVM (Java 21).
Usage
Use with a CDN (e.g. jsdelivr):
<link href="https://cdn.jsdelivr.net/npm/@webwriter/code/widgets/webwriter-code-java.css" rel="stylesheet">
<script type="module" src="https://cdn.jsdelivr.net/npm/@webwriter/code/widgets/webwriter-code-java.js"></script>
<webwriter-code-java></webwriter-code-java>
Or use with a bundler (e.g. Vite):
npm install @webwriter/code
<link href="@webwriter/code/widgets/webwriter-code-java.css" rel="stylesheet">
<script type="module" src="@webwriter/code/widgets/webwriter-code-java.js"></script>
<webwriter-code-java></webwriter-code-java>
Fields
| Name (Attribute Name) | Type | Description | Default | Reflects |
|---|---|---|---|---|
code (code) | String | The source code content displayed in the editor. | - | ✓ |
visible (visible) | boolean | Whether the code editor is visible to the user. | true | ✓ |
autoRun (autoRun) | boolean | Whether to automatically run the code when the component is first loaded. | false | ✓ |
runnable (runnable) | boolean | Whether the code execution is allowed and the run button is enabled. | true | ✓ |
autocomplete (autocomplete) | boolean | Whether autocompletion is enabled in the code editor. | false | ✓ |
lockedLines (lockedLines) | number[] | Array of line numbers that should be locked from editing. | [] | ✓ |
showExecutionTime (showExecutionTime) | boolean | Whether to display the execution time in the controls. | false | ✓ |
executionTime (executionTime) | number | The execution time in milliseconds of the last code run. | 0 | ✓ |
showExecutionCount (showExecutionCount) | boolean | Whether to display the execution count in the run button. | false | ✓ |
executionCount (executionCount) | number | The number of times the code has been executed. | 0 | ✓ |
results (results) | any | The results from the last code execution. | [] | ✓ |
diagnostics (diagnostics) | Diagnostic[] | Compilation or runtime errors from the last code execution. | [] | ✓ |
Fields including properties and attributes define the current state of the widget and offer customization options.
Editing config
| Name | Value |
|---|
The editing config defines how explorable authoring tools such as WebWriter treat the widget.
No public methods, slots, events, custom CSS properties, or CSS parts.
CodeTypeScript (<webwriter-code-typescript>)
Code widget for TypeScript with compilation and execution capabilities.
Usage
Use with a CDN (e.g. jsdelivr):
<link href="https://cdn.jsdelivr.net/npm/@webwriter/code/widgets/webwriter-code-typescript.css" rel="stylesheet">
<script type="module" src="https://cdn.jsdelivr.net/npm/@webwriter/code/widgets/webwriter-code-typescript.js"></script>
<webwriter-code-typescript></webwriter-code-typescript>
Or use with a bundler (e.g. Vite):
npm install @webwriter/code
<link href="@webwriter/code/widgets/webwriter-code-typescript.css" rel="stylesheet">
<script type="module" src="@webwriter/code/widgets/webwriter-code-typescript.js"></script>
<webwriter-code-typescript></webwriter-code-typescript>
Fields
| Name (Attribute Name) | Type | Description | Default | Reflects |
|---|---|---|---|---|
code (code) | String | The source code content displayed in the editor. | - | ✓ |
visible (visible) | boolean | Whether the code editor is visible to the user. | true | ✓ |
autoRun (autoRun) | boolean | Whether to automatically run the code when the component is first loaded. | false | ✓ |
runnable (runnable) | boolean | Whether the code execution is allowed and the run button is enabled. | true | ✓ |
autocomplete (autocomplete) | boolean | Whether autocompletion is enabled in the code editor. | false | ✓ |
lockedLines (lockedLines) | number[] | Array of line numbers that should be locked from editing. | [] | ✓ |
showExecutionTime (showExecutionTime) | boolean | Whether to display the execution time in the controls. | false | ✓ |
executionTime (executionTime) | number | The execution time in milliseconds of the last code run. | 0 | ✓ |
showExecutionCount (showExecutionCount) | boolean | Whether to display the execution count in the run button. | false | ✓ |
executionCount (executionCount) | number | The number of times the code has been executed. | 0 | ✓ |
results (results) | any | The results from the last code execution. | [] | ✓ |
diagnostics (diagnostics) | Diagnostic[] | Compilation or runtime errors from the last code execution. | [] | ✓ |
Fields including properties and attributes define the current state of the widget and offer customization options.
Editing config
| Name | Value |
|---|
The editing config defines how explorable authoring tools such as WebWriter treat the widget.
No public methods, slots, events, custom CSS properties, or CSS parts.
CodePython (<webwriter-code-python>)
Code widget for Python with execution capabilities using Pyodide.
Usage
Use with a CDN (e.g. jsdelivr):
<link href="https://cdn.jsdelivr.net/npm/@webwriter/code/widgets/webwriter-code-python.css" rel="stylesheet">
<script type="module" src="https://cdn.jsdelivr.net/npm/@webwriter/code/widgets/webwriter-code-python.js"></script>
<webwriter-code-python></webwriter-code-python>
Or use with a bundler (e.g. Vite):
npm install @webwriter/code
<link href="@webwriter/code/widgets/webwriter-code-python.css" rel="stylesheet">
<script type="module" src="@webwriter/code/widgets/webwriter-code-python.js"></script>
<webwriter-code-python></webwriter-code-python>
Fields
| Name (Attribute Name) | Type | Description | Default | Reflects |
|---|---|---|---|---|
code (code) | String | The source code content displayed in the editor. | - | ✓ |
visible (visible) | boolean | Whether the code editor is visible to the user. | true | ✓ |
autoRun (autoRun) | boolean | Whether to automatically run the code when the component is first loaded. | false | ✓ |
runnable (runnable) | boolean | Whether the code execution is allowed and the run button is enabled. | true | ✓ |
autocomplete (autocomplete) | boolean | Whether autocompletion is enabled in the code editor. | false | ✓ |
lockedLines (lockedLines) | number[] | Array of line numbers that should be locked from editing. | [] | ✓ |
showExecutionTime (showExecutionTime) | boolean | Whether to display the execution time in the controls. | false | ✓ |
executionTime (executionTime) | number | The execution time in milliseconds of the last code run. | 0 | ✓ |
showExecutionCount (showExecutionCount) | boolean | Whether to display the execution count in the run button. | false | ✓ |
executionCount (executionCount) | number | The number of times the code has been executed. | 0 | ✓ |
results (results) | any | The results from the last code execution. | [] | ✓ |
diagnostics (diagnostics) | Diagnostic[] | Compilation or runtime errors from the last code execution. | [] | ✓ |
Fields including properties and attributes define the current state of the widget and offer customization options.
Editing config
| Name | Value |
|---|
The editing config defines how explorable authoring tools such as WebWriter treat the widget.
No public methods, slots, events, custom CSS properties, or CSS parts.
CodeWebAssembly (<webwriter-code-webassembly>)
Code widget for WebAssembly with compilation and execution capabilities.
Usage
Use with a CDN (e.g. jsdelivr):
<link href="https://cdn.jsdelivr.net/npm/@webwriter/code/widgets/webwriter-code-webassembly.css" rel="stylesheet">
<script type="module" src="https://cdn.jsdelivr.net/npm/@webwriter/code/widgets/webwriter-code-webassembly.js"></script>
<webwriter-code-webassembly></webwriter-code-webassembly>
Or use with a bundler (e.g. Vite):
npm install @webwriter/code
<link href="@webwriter/code/widgets/webwriter-code-webassembly.css" rel="stylesheet">
<script type="module" src="@webwriter/code/widgets/webwriter-code-webassembly.js"></script>
<webwriter-code-webassembly></webwriter-code-webassembly>
Fields
| Name (Attribute Name) | Type | Description | Default | Reflects |
|---|---|---|---|---|
code (code) | String | The source code content displayed in the editor. | - | ✓ |
visible (visible) | boolean | Whether the code editor is visible to the user. | true | ✓ |
autoRun (autoRun) | boolean | Whether to automatically run the code when the component is first loaded. | false | ✓ |
runnable (runnable) | boolean | Whether the code execution is allowed and the run button is enabled. | true | ✓ |
autocomplete (autocomplete) | boolean | Whether autocompletion is enabled in the code editor. | false | ✓ |
lockedLines (lockedLines) | number[] | Array of line numbers that should be locked from editing. | [] | ✓ |
showExecutionTime (showExecutionTime) | boolean | Whether to display the execution time in the controls. | false | ✓ |
executionTime (executionTime) | number | The execution time in milliseconds of the last code run. | 0 | ✓ |
showExecutionCount (showExecutionCount) | boolean | Whether to display the execution count in the run button. | false | ✓ |
executionCount (executionCount) | number | The number of times the code has been executed. | 0 | ✓ |
results (results) | any | The results from the last code execution. | [] | ✓ |
diagnostics (diagnostics) | Diagnostic[] | Compilation or runtime errors from the last code execution. | [] | ✓ |
Fields including properties and attributes define the current state of the widget and offer customization options.
Editing config
| Name | Value |
|---|
The editing config defines how explorable authoring tools such as WebWriter treat the widget.
No public methods, slots, events, custom CSS properties, or CSS parts.
Generated with @webwriter/build@1.8.1
FAQs
Write and run code as a code cell. Supports several languages (HTML, JavaScript/TypeScript, Python, Java, WebAssembly).
We found that @webwriter/code demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 3 open source maintainers collaborating on the project.
Package last updated on 27 Sep 2025
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