no-logical-assignment-operator.md

no-logical-assignment-operator

This prevents use of the ES2021 Logical Assignment Operator:

a &&= b;

a ||= b;

a ??= b;

These will not be allowed because they are not supported in the following browsers:

• Edge < 85
• Safari < 14
• Firefox < 79
• Chrome < 85

What is the Fix?

You can instead safely repeat the variable in using just the logical operator in an assignment. For example the following lines are equivalent:

a = a && b;

a = a || b;

a = a ?? b;

This can be safely disabled if you intend to compile code with the @babel/plugin-transform-logical-assignment-operators Babel plugin, or @babel/preset-env.