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const obj = {
flag1: false,
flag2: false,
flag3: false,
flag4: false,
prop1() {
this.flag1 = true;
this.prop2();
},
prop2() {
this.flag2 = true;
this.prop3;
},
get prop3() {
this.flag3 = true;
this.prop4 = true;
},
set prop4(value) {
this.flag4 = value;
}
};
obj.prop1();
if (!obj.flag1) {
throw new Error('mutation 1 not detected');
}
if (!obj.flag2) {
throw new Error('mutation 2 not detected');
}
if (!obj.flag3) {
throw new Error('mutation 3 not detected');
}
if (!obj.flag4) {
throw new Error('mutation 4 not detected');
}
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