如何跨文件交叉引用私有成员拆分 ES6 class 定义？

Question

Referencing a private member EG this.#rts() gives the error:

SyntaxError: Private field ' #rts ' must be declared in an enclosing class

Although when that line is evaluated, the function has been assigned to an instance method and this is correctly bound.
Is there a way to achieve this, IE to reference private members across files ?

Note: I'm using Node 13.

Example:

import {Cpu6502} from "./cpu6502.mjs";
console.log((new Cpu6502).beq());

cpu6502.mjs :

import {beq} from "./instructions.mjs";
export class Cpu6502 {
    beq = beq // `this` is correctly bound
    #rts = () => "RTS"
}

instructions.mjs :

export function beq() {
    return this.#rts() // If this line references a public member instead,  
                       // it works fine and `this` is correctly bound.
}

Answer 1

You can use this approach but probably you want somenthing like a mixin

import { lda } from './instructions.mjs'

export class Cpu6502 {
    constructor() {
       this.lda = lda.bind(this);
    }
    A = 0xFF
    #rts() {
        return "RTS";
    }
    ldx() {
        return this.lda();
    }
}`