Typescript Workflow Example

Setup

• Install latest version of NodeJS LTS
• Install latest version of TypeScript (From PowerShell)

npm install -g typescript
npm install guid-typescript --save

• Update NPM (Run PowerShell as Administrator)

Set-ExecutionPolicy Unrestricted -Scope CurrentUser -Force
npm install --global --production npm-windows-upgrade
npm-windows-upgrade --npm-version latest

• Clone repo and open folder in VS Code
• Build Typescript code (Cntr+Shift+B)

Run the following in the Powershell terminal

node main.js

What does this approach give us:

• For each STEP
  • Individual model output on complete (Once done anyone can access this model)
  • Can only be complete when ready, only ready if parent is active step
  • Each step has a primary transition so that a complext hierarchy can be projected in flat menu structure
• For each TRANSITION
  • Each transition matches to the initialization contract of the next step (Moving them around will break design time)
  • Cannot change current state unless from a valid transition (Complete parent with ready child)
  • Optional validation of destination initialization payload
• For the WORKFLOW
  • Tree structured process flow (Not liniar)
  • Current step (Status)
  • Starting Step (Root step)
  • Holistic transition validation
  • Parent step invalidation (Propogate dirty to children, revoking completed state od children when parent change)
  • Before any transition can be made the workflow gets validated (Primary transitions, future orphans)

    Startup.stateMachine.startStep.CompleteStep(); // Model in this case is optional
    let supportRequest = new rq.Workflow.SupportRequest("AC001");
    Startup.stateMachine.startStep.Support.Transition(supportRequest);

Easily get access to the step output (model):

   let stepOutputModel = Startup.stateMachine.supportStep.Model;
   console.log(stepOutputModel);