@@ -13,6 +13,8 @@
 module.exports = {
 	meta: {
 		type: "problem",
+		dialects: ["typescript", "javascript"],
+		language: "javascript",
 
 		docs: {
 			description: "Disallow literal numbers that lose precision",
 
@@ -318,3 +318,38 @@ ruleTester.run("no-loss-of-precision", rule, {
 		},
 	],
 });
+
+const ruleTesterTypeScript = new RuleTester({
+	languageOptions: {
+		parser: require("@typescript-eslint/parser"),
+	},
+});
+
+ruleTesterTypeScript.run("no-loss-of-precision", rule, {
+	valid: [
+		"const x = 12345;",
+		"const x = 123.456;",
+		"const x = -123.456;",
+		"const x = 123_456;",
+		"const x = 123_00_000_000_000_000_000_000_000;",
+		"const x = 123.000_000_000_000_000_000_000_0;",
+	],
+	invalid: [
+		{
+			code: "const x = 9007199254740993;",
+			errors: [{ messageId: "noLossOfPrecision" }],
+		},
+		{
+			code: "const x = 9_007_199_254_740_993;",
+			errors: [{ messageId: "noLossOfPrecision" }],
+		},
+		{
+			code: "const x = 9_007_199_254_740.993e3;",
+			errors: [{ messageId: "noLossOfPrecision" }],
+		},
+		{
+			code: "const x = 0b100_000_000_000_000_000_000_000_000_000_000_000_000_000_000_000_000_001;",
+			errors: [{ messageId: "noLossOfPrecision" }],
+		},
+	],
+});