@typescript-eslint/eslint-plugin
Version:
TypeScript plugin for ESLint
71 lines (70 loc) • 2.51 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
const utils_1 = require("@typescript-eslint/utils");
const util_1 = require("../util");
function isEmptyExport(node) {
return (node.type === utils_1.AST_NODE_TYPES.ExportNamedDeclaration &&
node.specifiers.length === 0 &&
!node.declaration);
}
const exportOrImportNodeTypes = new Set([
utils_1.AST_NODE_TYPES.ExportAllDeclaration,
utils_1.AST_NODE_TYPES.ExportDefaultDeclaration,
utils_1.AST_NODE_TYPES.ExportNamedDeclaration,
utils_1.AST_NODE_TYPES.ExportSpecifier,
utils_1.AST_NODE_TYPES.ImportDeclaration,
utils_1.AST_NODE_TYPES.TSExportAssignment,
utils_1.AST_NODE_TYPES.TSImportEqualsDeclaration,
]);
exports.default = (0, util_1.createRule)({
name: 'no-useless-empty-export',
meta: {
type: 'suggestion',
docs: {
description: "Disallow empty exports that don't change anything in a module file",
},
fixable: 'code',
hasSuggestions: false,
messages: {
uselessExport: 'Empty export does nothing and can be removed.',
},
schema: [],
},
defaultOptions: [],
create(context) {
// In a definition file, export {} is necessary to make the module properly
// encapsulated, even when there are other exports
// https://github.com/typescript-eslint/typescript-eslint/issues/4975
if ((0, util_1.isDefinitionFile)(context.filename)) {
return {};
}
function checkNode(node) {
if (!Array.isArray(node.body)) {
return;
}
const emptyExports = [];
let foundOtherExport = false;
for (const statement of node.body) {
if (isEmptyExport(statement)) {
emptyExports.push(statement);
}
else if (exportOrImportNodeTypes.has(statement.type)) {
foundOtherExport = true;
}
}
if (foundOtherExport) {
for (const emptyExport of emptyExports) {
context.report({
node: emptyExport,
messageId: 'uselessExport',
fix: fixer => fixer.remove(emptyExport),
});
}
}
}
return {
Program: checkNode,
TSModuleDeclaration: checkNode,
};
},
});