Files
languageservices/workflow-parser
eric sciple 656a821a94 ESM migration: Add .js extensions for node16 moduleResolution (#257)
Migrate expressions, workflow-parser, and languageservice packages to use
proper ESM imports with .js extensions that work with node16 moduleResolution.

Changes:
- Update tsconfig.build.json in each package to use module: node16 and
  moduleResolution: node16
- Add .js extensions to all relative import paths (Option B approach)
- Fix yaml internal type imports in workflow-parser by defining local types
- Add skipLibCheck to handle @types/node compatibility issues
- Add TypeScript 5.8.3 override in root package.json
- Add ESM migration plan documentation

The languageserver package is deferred due to test hang issues that need
further investigation.

Related #154 - Upgrade moduleResolution from node to node16 or nodenext
Related #110 - Published ESM code has imports without file extensions
Related #64 - expressions: ERR_MODULE_NOT_FOUND attempting to run example
Related #146 - Can not import @actions/workflow-parser

Test results:
- expressions: 1068 tests passed
- workflow-parser: 292 tests passed
- languageservice: 452 tests passed

* docs: update ESM migration plan with findings

- Update languageserver blocker: vscode-languageserver v8.0.2 lacks ESM
  exports (not a test hang issue)
- Document that Option B (manual .js extensions) was chosen over Option A
  due to ts-jest compatibility issues
- Add workaround for yaml package internal types (LinePos, NodeBase)
- Update migration status table with accurate reason for deferral
- Add skipLibCheck note for @types/node compatibility
2025-12-18 13:35:48 -06:00
..
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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.