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Matchina

TypeScript-first
state machinery.

Extensible state and state machine primitives with excellent type inference and autocomplete.
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npm install matchina
fig.01 — fetcher machine ● live
fetch resolve reject reset retry IdleLoadingSuccessError
fetchresolverejectresetretryIdleLoadingSuccessError
fetcher.ts typescript 
const states = defineStates({
  Idle:    undefined,
  Loading: undefined,
  Success: (data: unknown) => data,
  Error:   (err: Error)    => err,
});


const machine = createMachine(
  states,
  {
    Idle:    { fetch:   'Loading' },
    Loading: { resolve: 'Success', reject: 'Error' },
    Success: { reset:   'Idle'    },
    Error:   { retry:   'Loading' },
  },
  'Idle'
);
2kb gzipped
0 dependencies
100% type-inferred