workflow-parser

actions/workflow-parser

@actions/workflow-parser is a library to parse GitHub Actions workflows.

Installation

The package contains TypeScript types and compiled ECMAScript modules.

npm install @actions/workflow-parser

Usage

The parser is driven by a custom schema defined in worflows-v1.0.json.

Simple example

parseWorkflow parses the workflow YAML into an intermediate representation and validates that it conforms to the schema. Any parsing errors are returned in the errors property of the result context.

var trace: TraceWriter;

const result = parseWorkflow(
  {
    name: "test.yaml",
    content: `on: push
jobs:
  build:
    runs-on: ubuntu-latest
    steps:
    - run: echo 'hello'`
  },
  trace
);

convertWorkflowTemplate then takes that intermediate representation and converts it to a WorkflowTemplate object, which is a more convenient representation for working with workflows.

const workflowTemplate = await convertWorkflowTemplate(result.context, result.value);

// workflowTemplate.jobs[0].id === "build"
// workflowTemplate.jobs[0].steps[0].run === "echo 'hello'"

Contributing

See CONTRIBUTING.md at the root of the repository for general guidelines and recommendations.

Similar to `actions/expressions, this project is just one of multiple implementations of the GitHub Actions workflow parser. We therefore cannot accept contributions that significantly modify the schema or the overall behavior of the parser. If you would like to propose changes to Actions itself, please use our Community Forum.

If you do want to contribute, please run prettier to format your code and add unit tests as appropriate before submitting your PR. ./testdata contains test cases that all implementations should pass, please also make sure those tests are still passing.

Build

npm run build

or to watch for changes

npm run watch

Test

npm test

or to watch for changes and run tests:

npm run test-watch

Lint

npm run format-check

License

This project is licensed under the terms of the MIT open source license. Please refer to MIT for the full terms.