babel-plugin-fix-class-properties-uninitialized v7.2.3

Install

npm install --save babel-plugin-fix-class-properties-uninitialiazed

Usage with .babelrc

{
  "presets": ["@babel/preset-env"],
  "plugins": [
    "babel-plugin-fix-class-properties-uninitialized",
    "@babel/plugin-proposal-class-properties"
  ]
}

What does it do ?

Fixes when you have unitialized properties, for example with @babel/preset-typescript:

class Foo extends Bar {
  prop!: string;
}

class Foo extends Bar {
  constructor() {
    super();
    this.prop = void 0;
  }
}

Except it causes an issue if prop is setup in the constructor of Bar. This plugin removes the uninitialized prop so that @babel/plugin-proposal-class-properties does not process it.