restrict-plus-operands.md
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restrict-plus-operands
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When adding two variables, operands must both be of type number or of type string (Examples of correct code:
var foo = parseInt('5.5', 10) + 10;
var foo = 1n + 1n;
Examples of incorrect code:
var foo = '5.5' + 5;
var foo = 1n + 1;
Options
This rule has an object option:
-
"checkCompoundAssignments": false
: (default) does not check compound assignments (+=
) "checkCompoundAssignments": true
checkCompoundAssignments
Examples of incorrect code for the { "checkCompoundAssignments": true }
option:
/*eslint @typescript-eslint/restrict-plus-operands: ["error", { "checkCompoundAssignments": true }]*/
let foo: string | undefined;
foo += 'some data';
let bar: string = '';
bar += 0;
Examples of correct code for the { "checkCompoundAssignments": true }
option:
/*eslint @typescript-eslint/restrict-plus-operands: ["error", { "checkCompoundAssignments": true }]*/
let foo: number = 0;
foo += 1;
let bar = '';
bar += 'test';
{
"@typescript-eslint/restrict-plus-operands": "error"
}
Compatibility
- TSLint: restrict-plus-operands