@typescript-eslint/eslint-plugin/dist/rules/no-for-in-array.js

"use strict";
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    if (k2 === undefined) k2 = k;
    Object.defineProperty(o, k2, { enumerable: true, get: function() { return m[k]; } });
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    if (k2 === undefined) k2 = k;
    o[k2] = m[k];
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    o["default"] = v;
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    if (mod && mod.__esModule) return mod;
    var result = {};
    if (mod != null) for (var k in mod) if (k !== "default" && Object.prototype.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
    __setModuleDefault(result, mod);
    return result;
};
Object.defineProperty(exports, "__esModule", { value: true });
const ts = __importStar(require("typescript"));
const util = __importStar(require("../util"));
exports.default = util.createRule({
    name: 'no-for-in-array',
    meta: {
        docs: {
            description: 'Disallow iterating over an array with a for-in loop',
            recommended: 'error',
            requiresTypeChecking: true,
        },
        messages: {
            forInViolation: 'For-in loops over arrays are forbidden. Use for-of or array.forEach instead.',
        },
        schema: [],
        type: 'problem',
    },
    defaultOptions: [],
    create(context) {
        return {
            ForInStatement(node) {
                const parserServices = util.getParserServices(context);
                const checker = parserServices.program.getTypeChecker();
                const originalNode = parserServices.esTreeNodeToTSNodeMap.get(node);
                const type = util.getConstrainedTypeAtLocation(checker, originalNode.expression);
                if (util.isTypeArrayTypeOrUnionOfArrayTypes(type, checker) ||
                    (type.flags & ts.TypeFlags.StringLike) !== 0) {
                    context.report({
                        node,
                        messageId: 'forInViolation',
                    });
                }
            },
        };
    },
});
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