no-for-in-array.js
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"use strict";
var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
if (k2 === undefined) k2 = k;
Object.defineProperty(o, k2, { enumerable: true, get: function() { return m[k]; } });
}) : (function(o, m, k, k2) {
if (k2 === undefined) k2 = k;
o[k2] = m[k];
}));
var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
Object.defineProperty(o, "default", { enumerable: true, value: v });
}) : function(o, v) {
o["default"] = v;
});
var __importStar = (this && this.__importStar) || function (mod) {
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',
category: 'Best Practices',
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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