@typescript-eslint/eslint-plugin/dist/rules/no-generated-empty-object-type.js

TypeScript plugin for ESLint

"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
const utils_1 = require("@typescript-eslint/utils");
const tsutils = __importStar(require("ts-api-utils"));
const ts = __importStar(require("typescript"));
const util_1 = require("../util");
exports.default = (0, util_1.createRule)({
    name: 'no-generated-empty-object-type',
    meta: {
        type: 'problem',
        docs: {
            description: 'Disallow type operations that resolve to the "empty object" type',
            recommended: 'strict',
            requiresTypeChecking: true,
        },
        messages: {
            noGeneratedEmptyObjectType: 'This type resolves to `{}`, the empty object type. This was likely not intentional.',
        },
        schema: [],
    },
    defaultOptions: [],
    create(context) {
        const services = (0, util_1.getParserServices)(context);
        const checker = services.program.getTypeChecker();
        function isEmptyObjectType(type) {
            return (tsutils.isObjectType(type) &&
                !tsutils.isObjectFlagSet(type, ts.ObjectFlags.Class | ts.ObjectFlags.Interface) &&
                checker.getPropertiesOfType(type).length === 0 &&
                checker.getIndexInfosOfType(type).length === 0 &&
                type.getCallSignatures().length === 0 &&
                type.getConstructSignatures().length === 0 &&
                // Types still awaiting type arguments, such as `Record<T, unknown>`
                // inside a generic declaration, also have no members yet.
                checker.isTypeAssignableTo(checker.getNumberType(), type));
        }
        function containsEmptyObjectType(type) {
            return (isEmptyObjectType(type) ||
                (type.isUnion() && type.types.some(isEmptyObjectType)));
        }
        function checkNode(node) {
            if (containsEmptyObjectType(services.getTypeAtLocation(node))) {
                context.report({
                    node,
                    messageId: 'noGeneratedEmptyObjectType',
                });
            }
        }
        return {
            TSIntersectionType: checkNode,
            TSTypeReference(node) {
                if (node.typeArguments &&
                    node.parent.type !== utils_1.AST_NODE_TYPES.TSIntersectionType) {
                    checkNode(node);
                }
            },
        };
    },
});
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