The following code:

class A {
    constructor(public x: number) {
    }
}

Since TypeScript 3.7, which added the useDefineForClassFields configuration¹, it is translated into the following result with "useDefineForClassFields": true (playground), up to the latest version (5.9.3):

"use strict";
class A {
    x;
    constructor(x) {
        this.x = x;
    }
}

esbuild currently (0.27.4) generates the following code (playground):

class A {
  constructor(x) {
    this.x = x;
  }
}

I think we should stay consistent with TypeScript.

related: microsoft/TypeScript#55132