Pass options through to `oncreate`

[Rich-Harris]

This has come up (most recently) once or twice in discussion — there are some situations where it would be helpful to be able to access the instantiation options in oncreate (though I don't think it's something we should encourage, it's a useful escape hatch).

[tomcon]

I admire the simplicity and power of svelte but did wonder about the lack of lifecycle events. Unless I'm misunderstanding this wouldn't a beforeCreate event to go with onCreate/afterCreate event be simpler? (likewise for destroy). Am assuming target node would be accessible in the updated onCreate/afterCreate.

[Rich-Harris]

What would you do in a beforeCreate that you wouldn't do in oncreate? (Genuine question.)

[tomcon]

Had thought it might be the place to grab some data or prep work but it does seem to be redundant. Coming from Vue, had thought that with mounted and other LC events that additional svelte events may be needed. Ignore this please Rich and it's refreshing to keep things minimal. Don't think beforeCreate is used much in Vue after all!

[m59peacemaker]

./Nested.html here is an example of something I am continually desiring, accomplished with hackery
https://svelte.technology/repl?version=1.30.0&gist=77ab59c28b56d44f6fb25cb750af9a20

And here's a less magical, but still hack-ugly version that rolls its own on:create https://svelte.technology/repl?version=1.30.0&gist=45b4a22ac71d357492994af0efc6837e

Can we have this?

<Counter ref:counter/>
<Component arguments="{ counter: this.refs.counter }"/>

<!-- Component.html -->
<button on:click="counter.increment()">increment</button>

<script>
export default {
  oncreate ({ counter }) {
    this.counter = counter
  }
}

[Rich-Harris]

As of 1.34, you can access this.options inside lifecycle hooks and methods