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babel-plugin-transform-custom-element-classes
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Compile Custom Element classes that extend HTMLElement
for ES5 environments.
Custom Elements were designed for native ES6 classes that can extend host objects in ways prototypical inheritance can not. Using the Babel transform-es2015-classes
transform will not work as is. You'll likely see a runtime error like "Uncaught TypeError: Failed to construct 'HTMLElement': Please use the 'new' operator, this DOM object constructor cannot be called as a function."
when attempting to extend HTMLElement
in a Babel transpiled class.
A workaround is to use Reflect.construct
to build a new HTMLElement
instance expected by the constructor. This transform wraps any ES6 classes extending HTMLElement
with an intermediary class that shims this behavior.
Reflect.construct
polyfill$ npm install babel-plugin-transform-custom-element-classes
.babelrc
.babelrc
// include before transform-es2015-classes
{
"plugins": [
"transform-custom-element-classes",
"transform-es2015-classes"
]
}
FAQs
Compile ES6 HTMLElement class extensions to ES5
The npm package babel-plugin-transform-custom-element-classes receives a total of 1,843 weekly downloads. As such, babel-plugin-transform-custom-element-classes popularity was classified as popular.
We found that babel-plugin-transform-custom-element-classes demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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