---

Key Features ✨

ts-graphviz package provides models and ASTs for the Graphviz DOT language fully integrated with TypeScript.

- TypeScript-friendly API
- It provides models in the DOT language. TypeScript type definitions are also provided for attributes and even attribute types.
- Freedom from programming paradigms
- Designed to be object-oriented, it provides APIs that can be adapted to both imperative and declarative APIs. You can choose the paradigm that best fits your project.
- Suitable for any use cases
- Both a high-layer API to provide models and a low-layer API to handle ASTs are provided to address any use cases.
- Modular and Extensible
- The library is split into multiple packages, each serving a specific purpose. This modular design allows users to pick and choose the functionality they need, resulting in improved maintainability and flexibility.
- Cross Platform
- It supports both Node.js and Deno and Browser.
- Customizable
- It provides a way to extend the library's type system to customize graph visualization solutions to meet specific needs.

Installation 💽

$3

This package can then be installed using a package manager.

``bash


npm

$ npm install -S ts-graphviz

or yarn

$ yarn add ts-graphviz

or pnpm

$ pnpm add ts-graphviz
`

> Note Want to try before installing? Check out Runkit to see how it works.

$3

Deno v1.28 and above supports npm.

You can install and use the package by specifying the following:

`ts
import { toDot } from 'npm:ts-graphviz';
`

Usage 📑

This section provides an overview of the package.

For more detailed API specifications, please refer to the comments in the TypeScript type definitions and the document automatically generated based on them.

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This module provides Model, an interface for working with the DOT language in JavaScript/TypeScript.

!ts-graphviz

#### Object-Oriented ❤️

Model is designed to be object-oriented and provides classes Digraph, Graph, Subgraph, Node, and Edge.

Provides a toDot function to convert Model to DOT (DOT language string).

`typescript
import { attribute as _, Digraph, Subgraph, Node, Edge, toDot } from 'ts-graphviz';

const G = new Digraph();
const A = new Subgraph('A');
const node1 = new Node('node1', {
[_.color]: 'red'
});
const node2 = new Node('node2', {
[_.color]: 'blue'
});
const edge = new Edge([node1, node2], {
[_.label]: 'Edge Label',
[_.color]: 'pink'
});
G.addSubgraph(A);
A.addNode(node1);
A.addNode(node2);
A.addEdge(edge);
const dot = toDot(G);
// digraph {
// subgraph "A" {
// "node1" [
// color = "red",
// ];
// "node2" [
// color = "blue",
// ];
// "node1" -> "node2" [
// label = "Edge Label",
// color = "pink",
// ];
// }
// }
`

Advanced Usage

##### Custom Class 🤖

You can also add your own implementation by inheriting from the class.

`typescript
import { Digraph, Node, Edge, EdgeTargetTuple, attribute as _, toDot } from 'ts-graphviz';

class MyCustomDigraph extends Digraph {
constructor() {
super('G', {
[_.label]: 'This is Custom Digraph',
});
}
}
class MyCustomNode extends Node {
constructor(id: string) {
super(node_${id}, {
[_.label]: This is Custom Node ${id},
});
}
}

class MyCustomEdge extends Edge {
constructor(targets: EdgeTargetTuple) {
super(targets, {
[_.label]: 'This is Custom Edge',
});
}
}

const digraph = new MyCustomDigraph();
const node1 = new MyCustomNode('A');
const node2 = new MyCustomNode('B');
const edge = new MyCustomEdge([node1, node2]);
digraph.addNode(node1);
digraph.addNode(node2);
digraph.addEdge(edge);
const dot = toDot(digraph);
// digraph "G" {
// label = "This is Custom Digraph";
// "node_A" [
// label = "This is Custom Node A";
// ];
// "node_B" [
// label = "This is Custom Node B";
// ];
// "node_A" -> "node_B" [
// label = "This is Custom Edge";
// ];
// }
`

##### Models Context API ( with method) 🧅

You can also use the _Models Context API_ to create custom classes for objects generated inside of Graph.


The with methods of Digraph, Graph, and Subgraph, which are implementations of GraphBaseModel, are provided to predefine custom models.

`typescript
const g = new Digraph();
g.with({
Node: MyCustomNode,
Edge: MyCustomEdge,
});
const a = g.createNode('A'); // MyCustomNode
const b = g.createNode('B'); // MyCustomNode
g.createEdge([a, b]); // MyCustomEdge
const dot = toDot(g);
// digraph {
// "node_A" [
// label = "This is Custom Node A";
// ];
// "node_B" [
// label = "This is Custom Node B";
// ];
// "node_A" -> "node_B" [
// label = "This is Custom Edge";
// ];
// }
`

##### fromDot function ⏪

> The status of this function is ! beta.

The main scenario for using this library is to use the toDot function, but it also supports conversions in the reverse direction.

By converting DOT to Model, a portion of the code can be written in the DOT language.

`typescript
const G = fromDot(
digraph {
node_A [
label = "This is a Label of Node A";
];
},
);

G.edge(['node_A', 'node_B']);

const dot = toDot(G)
// digraph {
// "node_A" [
// label = "This is a Label of Node A";
// ];
// "node_A" -> "node_B";
// }
`

#### Declarative API 😎

When creating Graph or Digraph, you can use _Model Factory_ to provide a notation more similar to the DOT language.

Model also has a declarative API, so you can consistently choose a declarative paradigm.


`typescript
import { attribute as _, digraph, toDot } from 'ts-graphviz';

const G = digraph('G', (g) => {
const a = g.node('aa');
const b = g.node('bb');
const c = g.node('cc');
g.edge([a, b, c], {
[_.color]: 'red'
});
g.subgraph('A', (A) => {
const Aa = A.node('Aaa', {
[_.color]: 'pink'
});

const Ab = A.node('Abb', {
[_.color]: 'violet'
});
const Ac = A.node('Acc');
A.edge([Aa.port('a'), Ab, Ac, 'E'], {
[_.color]: 'red'
});
});
});

const dot = toDot(G);
// digraph "G" {
// "aa";
// "bb";
// "cc";
// subgraph "A" {
// "Aaa" [
// color = "pink",
// ];
// "Abb" [
// color = "violet",
// ];
// "Acc";
// "Aaa":"a" -> "Abb" -> "Acc" -> "E" [
// color = "red",
// ];
// }
// "aa" -> "bb" -> "cc" [
// color = "red",
// ];
// }
`

> Note Of course, we also provide an API for creating strict mode graphs.
>
> `typescript
> import { strict, toDot } from 'ts-graphviz';
>
> const G = strict.graph(...);
> const dot = toDot(G);
> // strict graph {
> // }
> `




Advanced Usage

##### Models Context API ( withContext function ) 💈


The withContext function returns a _Model Factory_ function.

This _Model Factory_ provides a means to replace RootGraphModel with a custom class, such as Digraph or Graph.

This API provides a way to integrate declarative APIs and custom classes.

`typescript
const { digraph } = withContext({
Digraph: MyCustomDigraph,
Node: MyCustomNode,
Edge: MyCustomEdge,
});

const G = digraph((g) => {
const a = g.node('A'); // MyCustomNode
const b = g.node('B'); // MyCustomNode
g.edge([a, b]); // MyCustomEdge
});
const dot = toDot(g);
// digraph "G" {
// label = "This is Custom Digraph";
// "node_A" [
// label = "This is Custom Node A";
// ];
// "node_B" [
// label = "This is Custom Node B";
// ];
// "node_A" -> "node_B" [
// label = "This is Custom Edge";
// ];
// }
`

$3

> This module status is !beta.


Provides an interface to run Graphviz dot commands.

Graphviz must be installed so that the dot command can be executed.

Execute the dot command to output a DOT language string to a stream or file.

!Adapter State Machine

This module provides the following functions.

- The toStream function converts DOT to Stream.
`ts
import { toStream } from 'ts-graphviz/adapter';

const dot =
digraph example {
node1 [
label = "My Node",
]
}
;

const stream = await toStream(dot, { format: 'svg' });
// Node.js
stream.pipe(process.stdout);
// Deno
await stream.pipeTo(Deno.stdout.writable);
`
- Writes DOT to a file at the specified path toFile function
`ts
import { toFile } from 'ts-graphviz/adapter';

const dot =
digraph example {
node1 [
label = "My Node",
]
}
;

await toFile(dot, './result.svg', { format: 'svg' });
`

> Note Designed to work with Node.js and Deno, Stream is runtime native.

$3

> This module status is !beta.

An API is provided to handle ASTs for advanced use.

!State Machine

The following functions are provided as described in the state transition diagram.

- The fromModel function converts Model to AST.
- The toModel function converts AST to Model.
- The stringify function converts AST to DOT.
- The parse function to convert from DOT to AST.

> Note As you can see from the above figure, the toDot function provided by the ts-graphviz package is a composite of fromModel and stringify. The fromDot function is a composite of parse and toModel.

Detailed usage is TODO.
Please refer to the TypeScript type definition.




The parse function and AST


`typescript
import { parse } from '@ts-graphviz/ast';

const ast = parse(
digraph example {
node1 [
label = "My Node",
]
}
);
// {
// type: 'Dot',
// location: {
// start: { offset: 3, line: 2, column: 3 },
// end: { offset: 68, line: 7, column: 1 }
// },
// children: [
// {
// id: {
// value: 'example',
// quoted: false,
// type: 'Literal',
// location: {
// start: { offset: 11, line: 2, column: 11 },
// end: { offset: 18, line: 2, column: 18 }
// },
// children: []
// },
// directed: true,
// strict: false,
// type: 'Graph',
// location: {
// start: { offset: 3, line: 2, column: 3 },
// end: { offset: 67, line: 6, column: 4 }
// },
// children: [
// {
// id: {
// value: 'node1',
// quoted: false,
// type: 'Literal',
// location: {
// start: { offset: 25, line: 3, column: 5 },
// end: { offset: 30, line: 3, column: 10 }
// },
// children: []
// },
// type: 'Node',
// location: {
// start: { offset: 25, line: 3, column: 5 },
// end: { offset: 63, line: 5, column: 6 }
// },
// children: [
// {
// key: {
// value: 'label',
// quoted: false,
// type: 'Literal',
// location: {
// start: { offset: 39, line: 4, column: 7 },
// end: { offset: 44, line: 4, column: 12 }
// },
// children: []
// },
// value: {
// value: 'My Node',
// quoted: true,
// type: 'Literal',
// location: {
// start: { offset: 47, line: 4, column: 15 },
// end: { offset: 56, line: 4, column: 24 }
// },
// children: []
// },
// location: {
// start: { offset: 39, line: 4, column: 7 },
// end: { offset: 57, line: 4, column: 25 }
// },
// type: 'Attribute',
// children: []
// }
// ]
// }
// ]
// }
// ]
// }
`

$3

> The status of this feature is !beta.

With ts-graphviz, you can extend the library's type system to customize graph visualization solutions to meet specific needs.

> Note To allow for customization, types are named with the $ symbol.
>
> If you want to extend a type definition in cases not listed below, check the source code to see if you can extend it with $....
>
> If not, please create an issue or pull request.

#### Use Case: Specifying Custom Graph Layout and Output Formats

`ts
import { $keywords } from '@ts-graphviz/common';
import { toFile } from '@ts-graphviz/adapter';

// 1. Declare the '@ts-graphviz/adapter' module.
declare module '@ts-graphviz/adapter' {
export namespace Layout {
// 2. Define the $values interface in the Layout namespace.
// 3. Inherit from $keywords<'my-custom-algorithm'> and specify the name of the new layout engine in <...>.
export interface $values extends $keywords<'my-custom-algorithm'> {}
}

export namespace Format {
// 4. Define the $values interface in the Format namespace.
// 5. Inherit from $keywords<'mp4'> and specify the name of the new output format in <...>.
export interface $values extends $keywords<'mp4'> {}
}
}

toFile('digraph { a -> b }', '/path/to/file', {
layout: 'my-custom-algorithm',
format: 'mp4',
});
`

#### Use Case: Adding Custom Attributes

`ts
import { $keywords } from '@ts-graphviz/common';
import { digraph, toDot, attribute as _ } from 'ts-graphviz';

// 1. Declare the '@ts-graphviz/common' module.
declare module '@ts-graphviz/common' {
export namespace GraphAttributeKey {
// 2. Define the $values interface in the GraphAttributeKey namespace.
// 3. Inherit from $keywords<'hoge'> and specify the name of the new attribute in <...>.
export interface $values extends $keywords<'hoge'> {}
}

export namespace Attribute {
// 4. Define the $keys interface in the Attribute namespace.
// 5. Inherit from $keywords<'hoge'> and specify the name of the new attribute in <...>.
export interface $keys extends $keywords<'hoge'> {}

// 6. Define the $types interface in the Attribute namespace.
// 7. Specify the new attribute in the key and define its corresponding value in the value.
export interface $types {
hoge: string;
}
}
}

console.log(
toDot(
digraph((g) => {
g.set(_.hoge, 'fuga');
}),
),
);
`

Deep dive 🏊‍♂️

$3

See ARCHITECTURE.md for more details.

$3

See SECURITY.md for more details.




Who's using ts-graphviz 📜

- Apollo GraphQL
- AWS
- IBM (StrongLoop)
- The University of Tokyo
- Transmute

> Note Let us know that you're using ts-graphviz` on GitHub Discussions 🙏

Related Projects 💫

Related projects can be found at ts-graphviz GitHub Organization.

The TypeScript/JavaScript ecosystem provides a variety of OSS with the goal of making Graphviz more connected and easier to use.

Contributors 👥

Thanks goes to these wonderful people (emoji key):

Yuki Yamazaki 💻 ⚠️ 📖 🤔	LaySent 🐛 ⚠️	elasticdotventures 📖	Christian Murphy 💻 🤔 📖	Artem 🐛	fredericohpandolfo 🐛	diegoquinteiro 🐛
robross0606 🤔	Blake Regalia 🐛	bigbug 💬	mrwk 💬	svdvonde 💬	Adam 💬	Trevor Scheer ️️️️♿️
Prem Pillai 🐛	nagasawaryoya 💻 ⚠️	YukiSasaki 💻 ⚠️	Madd0g 🐛	j4k0xb 🐛	HKrogstie 🐛	Nils K 🐛
hao2013 🚧 👀	Walter Rafelsberger 💬	grsjst 🐛	Steve 🐛

This project follows the all-contributors
specification. Contributions of any kind welcome!

How to Contribute 💪

The easiest way to contribute is to use the library and star repository.

$3

Feel free to ask questions on GitHub Discussions.

$3

Please register at GitHub Issues.

$3

See CONTRIBUTING.md.

$3

Support this project by becoming a sponsor. Your logo will show up here with a link to your website. Become a sponsor

!OpenCollective Sponsors

Thank you to all our backers! 🙏 Become a backer

!OpenCollective Backers

Please support ts-graphviz on Open Collective or GitHub Sponsors.

> Note Even just a dollar is enough motivation to develop 😊

Changelog 📜

See CHANGELOG.md for more details.

ts-graphviz for Enterprise 🏢

Available as part of the Tidelift Subscription.

The maintainers of ts-graphviz and thousands of other packages are working with Tidelift to deliver commercial support and maintenance for the open-source dependencies you use to build your applications.
Save time, reduce risk, and improve code health, while paying the maintainers of the exact dependencies you use.

Learn more.

License ⚖️

This software is released under the MIT License, see LICENSE.