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Move validation of `<style>` contents to compilation

1

As of #3442, we check for CSS that cannot be inlined into `` tags (e.g. because it contains the string ``, which could could cause an XSS vulnerability). Right now...

nolanlawson

**Is your feature request related to a problem? Please describe.** In addition to warning on usages of `if:true` and `if:false` as part of issue #3342 we can take a step...

jmsjtu

### Description Currently an LWC component can do: ```js import * as wireService from 'wire-service' ``` Instead it should do: ```js import * as wireService from '@lwc/wire-service' ``` We support...

nolanlawson

[Marko](https://markojs.com/) has an optimization where, for components that are fully static, the following happens: 1. The components are SSR'ed, but 2. The components are not hydrated/CSR'ed ![Screenshot 2023-05-23 at 4...

nolanlawson

[Complex expressions] Duplicate `$cmp.$cmp.prop` generated

1

[Repro](https://stackblitz.com/edit/salesforce-lwc-nsjbdc?file=src%2Fmodules%2Fx%2Fapp%2Fapp.html,rollup.config.js,src%2Fmodules%2Fx%2Fapp%2Fapp.js&title=LWC%20playground) ```html one(row)}> one two(row)}> two ``` Generates: ```js function tmpl($api, $cmp, $slotset, $ctx) { /* ... */ return api_iterator($cmp.rows, function(row) { return api_element("tr", { key: api_key(0, row.id) }, [api_element("td",...

nolanlawson

DOMException: Failed to execute 'setAttributeNS' on 'Element' on `<svg xmlns:xlink>`

3

### Description ``s with the `xmlns:xlink` attribute cause a runtime error that only occurs with dynamic VNodes (not static ones). #### Steps to Reproduce ```html ``` Result ``` Uncaught DOMException:...

nolanlawson

Score 100% on Custom Elements Everywhere benchmark

4

The [Custom Elements Everywhere](https://custom-elements-everywhere.com/) benchmark is an industry-standard tool to measure the degree that a web framework supports custom elements (web components). Now that we have `lwc:external`, we should be...

nolanlawson

Components should not "inherit" `@api` from their superclasses

1

Follow-up to #3758 ```js // superclass.js export default class extends LightningElement { @api foo() {} } ``` ```js // subclass.js export default class extends Superclass { foo() {} } ```...

nolanlawson

CustomElementConstructor should accept props that exist before upgrade

8

### Description Pre-existing props on an HTML element, when combined with `CustomElementConstructor`, do not result in the correct props being set on the LWC component. ```html ``` ```js // app.js...

nolanlawson

We're adding a flag to enable legacy CSS scope token rendering (`ENABLE_LEGACY_SCOPE_TOKENS`). We don't want to support it forever, so this bug is to track that.

nolanlawson