complete/no-unsafe-plusplus

💼 This rule is enabled in the ✅ recommended config.

📝 Disallows unsafe and confusing uses of the ++ and -- operators.

💭 This rule requires type information.

Rule Details

This rule heavily restricts the usage of the ++ and -- operators. Essentially, you are only allowed to use “foo++” in places where swapping it to “++foo” or “foo += 1” would have no functional change in the program.

This rule is meant to be used in conjunction with this prefer-plusplus and prefer-postfix-plusplus ESLint rules.

// Bad
(foo++, foo++, foo++);
for (foo++; ;) {}
for (; foo++;) {}
foo++ + foo++;
array[foo++];

// Good
foo++;
void foo++;
(foo++, foo++, 0);
for (; ; foo++) {}

Options

This rule is not configurable.

Credits

This rule was originally created by webstrand in the TypeScript Discord.

Resources

• How to use this rule
• Rule source
• Test source