@studnicky/v8/object-spread

Spreading another object into an object literal built inside a constructor ({ ...defaults, ...options }) copies a variable, data-dependent set of properties in a variable order, so V8 cannot assign the resulting instance a stable hidden class from one construction to the next. Assign each property explicitly instead, so every instance is built through the same fixed sequence of property assignments.

Fixable: No · Options: No · Suggested severity: error

✗ Incorrect

class RetryOptions {
  #config: RetryOptionsType;

  constructor(overrides: Partial<RetryOptionsType>) {
    this.#config = { ...DEFAULT_RETRY_OPTIONS, ...overrides };
  }
}

✓ Correct

class RetryOptions {
  #attempts: number;
  #delayMs: number;

  constructor(overrides: Partial<RetryOptionsType>) {
    this.#attempts = overrides.attempts ?? DEFAULT_RETRY_OPTIONS.attempts;
    this.#delayMs = overrides.delayMs ?? DEFAULT_RETRY_OPTIONS.delayMs;
  }
}