diff --git a/packages/eslint-plugin/docs/rules/restrict-plus-operands.md b/packages/eslint-plugin/docs/rules/restrict-plus-operands.md
index a1436daf7695..1efffa83e69e 100644
--- a/packages/eslint-plugin/docs/rules/restrict-plus-operands.md
+++ b/packages/eslint-plugin/docs/rules/restrict-plus-operands.md
@@ -4,12 +4,14 @@ Examples of **correct** code:
```ts
var foo = parseInt('5.5', 10) + 10;
+var foo = 1n + 1n;
```
Examples of **incorrect** code:
```ts
var foo = '5.5' + 5;
+var foo = 1n + 1;
```
## Options
diff --git a/packages/eslint-plugin/src/rules/restrict-plus-operands.ts b/packages/eslint-plugin/src/rules/restrict-plus-operands.ts
index 3b50170b59cf..6b63f88a4f74 100644
--- a/packages/eslint-plugin/src/rules/restrict-plus-operands.ts
+++ b/packages/eslint-plugin/src/rules/restrict-plus-operands.ts
@@ -18,6 +18,7 @@ export default util.createRule({
"Operands of '+' operation must either be both strings or both numbers.",
notStrings:
"Operands of '+' operation must either be both strings or both numbers. Consider using a template literal.",
+ notBigInts: "Operands of '+' operation must be both bigints.",
},
schema: [],
},
@@ -27,7 +28,7 @@ export default util.createRule({
const typeChecker = service.program.getTypeChecker();
- type BaseLiteral = 'string' | 'number' | 'invalid';
+ type BaseLiteral = 'string' | 'number' | 'bigint' | 'invalid';
/**
* Helper function to get base type of node
@@ -41,6 +42,10 @@ export default util.createRule({
if (type.isStringLiteral()) {
return 'string';
}
+ // is BigIntLiteral
+ if (type.flags & ts.TypeFlags.BigIntLiteral) {
+ return 'bigint';
+ }
if (type.isUnion()) {
const types = type.types.map(getBaseTypeOfLiteralType);
@@ -81,6 +86,11 @@ export default util.createRule({
node,
messageId: 'notStrings',
});
+ } else if (leftType === 'bigint' || rightType === 'bigint') {
+ context.report({
+ node,
+ messageId: 'notBigInts',
+ });
} else {
context.report({
node,
diff --git a/packages/eslint-plugin/tests/rules/restrict-plus-operands.test.ts b/packages/eslint-plugin/tests/rules/restrict-plus-operands.test.ts
index 3d44ba022b87..4cff2c7c5c12 100644
--- a/packages/eslint-plugin/tests/rules/restrict-plus-operands.test.ts
+++ b/packages/eslint-plugin/tests/rules/restrict-plus-operands.test.ts
@@ -22,6 +22,7 @@ ruleTester.run('restrict-plus-operands', rule, {
`var foo = "5.5" + "10";`,
`var foo = parseInt("5.5", 10) + 10;`,
`var foo = parseFloat("5.5", 10) + 10;`,
+ `var foo = 1n + 1n;`,
`
function test () : number { return 2; }
var foo = test("5.5", 10) + 10;
@@ -262,5 +263,25 @@ var foo = pair + pair;
},
],
},
+ {
+ code: `var foo = 1n + 1`,
+ errors: [
+ {
+ messageId: 'notBigInts',
+ line: 1,
+ column: 11,
+ },
+ ],
+ },
+ {
+ code: `var foo = 1 + 1n`,
+ errors: [
+ {
+ messageId: 'notBigInts',
+ line: 1,
+ column: 11,
+ },
+ ],
+ },
],
});
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