I was eager to incorporate JavaScript private fields into my Angular (v17) application built with Angular CLI. I specified the target as ES2022 in the tsconfig, but after building the app, I discovered that my private field had been poly-filled with a WeakMap. I'm curious to understand why this occurred.
ng new my-brand-new-app
@Component({
...
})
export class AppComponent {
#hello = 'hello';
title = this.#hello;
}
ng build
It seems your .browserslist configuration may be targeting browsers that do not support private fields.
The Angular CLI relies on browserslist to adapt your code syntax for compatible browsers.
By default (if no specific config is provided), Angular follows this setup:
last 2 Chrome versions
last 1 Firefox version
last 2 Edge major versions
last 2 Safari major versions
last 2 iOS major versions
Firefox ESR
Although I am not entirely sure why, updating the Safari entry like this can resolve the issue:
last 1 Safari major versions
last 1 iOS major versions
This adjustment should address the problem you are facing.
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