Vue warn All In One
ES6 solution
[Vue warn]: Error in mounted hook: "TypeError: Invalid attempt to spread non-iterable instance.
// ❌
this.labelList = [...this.ruleForm.adLabels];
// ✅
+ this.labelList = [...this?.ruleForm?.adLabels ?? []];
// OR
// ✅
+ this.labelList = this?.ruleForm?.adLabels ?? [];
refs
https://github.com/vuejs/vue-cli/issues/1303#issuecomment-921655366
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