52 lines
1.5 KiB
Markdown
52 lines
1.5 KiB
Markdown
# IT FSM
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[](https://travis-ci.com/icetemple/npm-it-fsm)
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[](https://coveralls.io/github/icetemple/npm-it-fsm?branch=master)
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Simple finite state machine
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### Installation
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`npm install --save it-fsm`
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### Usage
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```ts
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import { StateMachineBuilder } from "it-fsm";
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enum ProjectStatus {
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Pending = "pending",
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Active = "active",
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Completed = "completed",
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Archived = "archive",
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}
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const smbProject = new StateMachineBuilder()
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.withStates(Object.values(ProjectStatus))
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.withTransitions([
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[ProjectStatus.Pending, [ProjectStatus.Active, ProjectStatus.Archived]],
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[ProjectStatus.Active, [ProjectStatus.Completed]],
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]);
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async function main() {
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const project1 = { id: 1, status: ProjectStatus.Pending };
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const project2 = { id: 2, status: ProjectStatus.Completed };
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// Build FSM with current project status
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const smForProject1 = smbProject.build(project1.status);
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const smForProject2 = smbProject.build(project2.status);
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console.log(smForProject2.allowedTransitionStates()); // []
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console.log(smForProject1.allowedTransitionStates()); // [active, archived]
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await smForProject1.changeState(ProjectStatus.Active);
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console.log(smForProject1.allowedTransitionStates()); // [completed]
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await smForProject1.changeState(ProjectStatus.Completed);
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console.log(smForProject1.allowedTransitionStates()); // []
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}
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main();
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```
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