V2 🚀

[garronej]

Install 2.0 beta now:

npm install --save evt@beta
yarn add evt@beta

If you wish to use v2 beta on Deno, don't hesitate to ping me I will publish it somehow.

Roadmap:

• Get rid of the need to add the $ when attaching with operator.
• Support for async operators ( other than with "evt/asyncPipe").
• Make the operators way more simple.
• Create SelfManaged operators for more complex operation.
• StatefulEvt: When attaching the handler should immediately be triggered with the state value.
• StatefulEvt evt.state= x only triggers evt.post(x) if x !== evt.state
• StatefulEvt: Get rid of evtDiff, evtChange, evtChangeDiff, provide operators to polifill this behaviour.
• Re-write the doc with meaningful examples.
• Support DOM observable like ResizeObserver like Evt.from(ctx, ResizeObserver, htmlElement).attach(...)
• Ctx All handler added with a .done() Ctx should be immediately detached.
• Get read of VoidEvt and VoidCtx now that we can just use Evt<void> and Ctx<void>
• Way (via an operator) to get from an evt a new instance that only postAsyncOnceHandled.
• Clean way for performing side effect in operators.
• Easy way to test if an event data is handled by a particular operator Evt.prototype.isHandledByOp() (Evt.prototype.getStatelesOp() replaced by Evt.prototype.getInvocableOp())
• evt/hooks/useStatefullEvt renamed useRerenderOnStateChange
• Use getter and setter instead of weird workaround for backward compatibility.
• Export evt/tools/typeSafety into a separate module tsafe
• There is a bug in UnpackEvt UnpackEvt<Evt<string | undefined>> is string instead of being string | undefined
• Decide if pipe on statefull event should should internally call evt.state = x or evt.post(x). (see comment, currently it calls post)
• We should be able to create StatefullEvt where the initial state is only computer when accessed Evt.create(()=> "initial state" )
• ctx.evtDoneOrAborted() should be a StatefulEvt

Trade offs:

Dropped backward compatibility with typescript 3.4.
EVT now requires a version of TypeScript >= 3.8 (February 20th, 2020)

[garronej]

import { Evt } from "evt";


const obj = { "foo": 33 };

const evt = Evt.create(obj);

evt.attach(o=> console.log("1", o.foo));

evt.pipe(o => [o.foo]).attach(foo=> console.log("2", foo));

//evt.state = { "foo": 33};

//evt.postForceChange([obj]);

//evt.state = obj;

evt.post(obj);

[garronej]

Fix Evt.factorize when there is undefined in the union