README.md

Serverless Workflow Specification - Typescript SDK

Provides the Typescript API/SPI for the Serverless Workflow Specification

With the SDK you can:

• Parse workflow JSON and YAML definitions
• Programmatically build workflow definitions
• Validate workflow definitions

Getting Started

Building locally

To build the project and run tests locally:

git clone https://github.com/serverlessworkflow/sdk-typescript.git
cd sdk-typescript
npm install && npm run update-code-base && npm run test

Add as dependency to your project

You can use npm link to add the sdk-typescript as dependency in your project.

• Clone the sdk-typescript project and build it:

git clone https://github.com/serverlessworkflow/sdk-typescript.git
cd sdk-typescript
npm install && npm run build

• Make the package visible globally to npm. Inside the sdk-typescript project folder run:

npm link

• Navigate to the folder/project in which you want to use the sdk, and run the following command:

npm link sdk-typescript

It will create a symbolic link from globally-installed sdk-typescript to node_modules/ of the current folder.

How to use

Create Workflow using builder API

const workflow = workflowBuilder()
  .id("helloworld")
  .version("1.0")
  .name("Hello World Workflow")
  .description("Inject Hello World")
  .start("Hello State")
  .states([injectstateBuilder()
    .type("inject")
    .name("Hello State")
    .data({
        "result": "Hello World!"
    })
    .end(true)
    .build()
  ])
  .build());

Load a file JSON/YAML to a Workflow instance

    const workflow = WorkflowConverter.fromString(source)

Where source is a JSON or a YAML string.

Parse a Workflow instance to JSON/YAML

Having the following workflow instance:

const workflow = workflowBuilder()
  .id("helloworld")
  .version("1.0")
  .name("Hello World Workflow")
  .description("Inject Hello World")
  .start("Hello State")
  .states([injectstateBuilder()
    .type("inject")
    .name("Hello State")
    .data({
      "result": "Hello World!"
    })
    .end(true)
    .build()
  ])
  .build());

You can convert it to its string representation in JSON or YAML format by using the static methods toJson or toYaml respectively:

    const workflowAsJson = WorkflowConverter.toJson(workflow);

    const workflowAsYaml = WorkflowConverter.toYaml(workflow);

Validate workflow definitions

The sdk provides a way to validate if a workflow object is compliant with the serverlessworkflow specification.

WorkflowValidator class provides a validation method:

• validate(): boolean

const workflowValidator = new WorkflowValidator(workflow);
if (!workflowValidator.validate()) {
  workflowValidator.validationErrors.forEach(error => console.error(error.message));
}