@typescript-eslint/eslint-plugin/dist/rules/no-unsafe-unary-minus.js

TypeScript plugin for ESLint

"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
const tsutils = __importStar(require("ts-api-utils"));
const ts = __importStar(require("typescript"));
const util = __importStar(require("../util"));
exports.default = util.createRule({
    name: 'no-unsafe-unary-minus',
    meta: {
        type: 'problem',
        docs: {
            description: 'Require unary negation to take a number',
            recommended: 'recommended',
            requiresTypeChecking: true,
        },
        messages: {
            unaryMinus: 'Argument of unary negation should be assignable to number | bigint but is {{type}} instead.',
        },
        schema: [],
    },
    defaultOptions: [],
    create(context) {
        return {
            UnaryExpression(node) {
                if (node.operator !== '-') {
                    return;
                }
                const services = util.getParserServices(context);
                const argType = util.getConstrainedTypeAtLocation(services, node.argument);
                const checker = services.program.getTypeChecker();
                if (tsutils
                    .unionConstituents(argType)
                    .some(type => !tsutils.isTypeFlagSet(type, ts.TypeFlags.Any |
                    ts.TypeFlags.Never |
                    ts.TypeFlags.BigIntLike |
                    ts.TypeFlags.NumberLike))) {
                    context.report({
                        node,
                        messageId: 'unaryMinus',
                        data: { type: checker.typeToString(argType) },
                    });
                }
            },
        };
    },
});