250 lines
32 KiB
JavaScript
250 lines
32 KiB
JavaScript
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'use strict';var _slicedToArray = function () {function sliceIterator(arr, i) {var _arr = [];var _n = true;var _d = false;var _e = undefined;try {for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) {_arr.push(_s.value);if (i && _arr.length === i) break;}} catch (err) {_d = true;_e = err;} finally {try {if (!_n && _i["return"]) _i["return"]();} finally {if (_d) throw _e;}}return _arr;}return function (arr, i) {if (Array.isArray(arr)) {return arr;} else if (Symbol.iterator in Object(arr)) {return sliceIterator(arr, i);} else {throw new TypeError("Invalid attempt to destructure non-iterable instance");}};}();var _ExportMap = require('../ExportMap');var _ExportMap2 = _interopRequireDefault(_ExportMap);
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var _docsUrl = require('../docsUrl');var _docsUrl2 = _interopRequireDefault(_docsUrl);
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var _arrayIncludes = require('array-includes');var _arrayIncludes2 = _interopRequireDefault(_arrayIncludes);
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var _arrayPrototype = require('array.prototype.flatmap');var _arrayPrototype2 = _interopRequireDefault(_arrayPrototype);function _interopRequireDefault(obj) {return obj && obj.__esModule ? obj : { 'default': obj };}
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/*
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Notes on TypeScript namespaces aka TSModuleDeclaration:
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There are two forms:
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- active namespaces: namespace Foo {} / module Foo {}
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- ambient modules; declare module "eslint-plugin-import" {}
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active namespaces:
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- cannot contain a default export
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- cannot contain an export all
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- cannot contain a multi name export (export { a, b })
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- can have active namespaces nested within them
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ambient namespaces:
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- can only be defined in .d.ts files
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- cannot be nested within active namespaces
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- have no other restrictions
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*/
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var rootProgram = 'root';
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var tsTypePrefix = 'type:';
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/**
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* Detect function overloads like:
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* ```ts
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* export function foo(a: number);
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* export function foo(a: string);
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* export function foo(a: number|string) { return a; }
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* ```
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* @param {Set<Object>} nodes
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* @returns {boolean}
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*/
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function isTypescriptFunctionOverloads(nodes) {
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var nodesArr = Array.from(nodes);
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var idents = (0, _arrayPrototype2['default'])(
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nodesArr,
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function (node) {return node.declaration && (
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node.declaration.type === 'TSDeclareFunction' // eslint 6+
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|| node.declaration.type === 'TSEmptyBodyFunctionDeclaration' // eslint 4-5
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) ?
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node.declaration.id.name :
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[];});
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if (new Set(idents).size !== idents.length) {
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return true;
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}
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var types = new Set(nodesArr.map(function (node) {return node.parent.type;}));
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if (!types.has('TSDeclareFunction')) {
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return false;
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}
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if (types.size === 1) {
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return true;
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}
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if (types.size === 2 && types.has('FunctionDeclaration')) {
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return true;
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}
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return false;
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}
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/**
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* Detect merging Namespaces with Classes, Functions, or Enums like:
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* ```ts
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* export class Foo { }
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* export namespace Foo { }
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* ```
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* @param {Set<Object>} nodes
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* @returns {boolean}
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*/
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function isTypescriptNamespaceMerging(nodes) {
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var types = new Set(Array.from(nodes, function (node) {return node.parent.type;}));
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var noNamespaceNodes = Array.from(nodes).filter(function (node) {return node.parent.type !== 'TSModuleDeclaration';});
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return types.has('TSModuleDeclaration') && (
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types.size === 1
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// Merging with functions
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|| types.size === 2 && (types.has('FunctionDeclaration') || types.has('TSDeclareFunction')) ||
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types.size === 3 && types.has('FunctionDeclaration') && types.has('TSDeclareFunction')
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// Merging with classes or enums
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|| types.size === 2 && (types.has('ClassDeclaration') || types.has('TSEnumDeclaration')) && noNamespaceNodes.length === 1);
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}
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/**
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* Detect if a typescript namespace node should be reported as multiple export:
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* ```ts
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* export class Foo { }
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* export function Foo();
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* export namespace Foo { }
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* ```
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* @param {Object} node
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* @param {Set<Object>} nodes
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* @returns {boolean}
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*/
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function shouldSkipTypescriptNamespace(node, nodes) {
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var types = new Set(Array.from(nodes, function (node) {return node.parent.type;}));
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return !isTypescriptNamespaceMerging(nodes) &&
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node.parent.type === 'TSModuleDeclaration' && (
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types.has('TSEnumDeclaration') ||
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types.has('ClassDeclaration') ||
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types.has('FunctionDeclaration') ||
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types.has('TSDeclareFunction'));
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}
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module.exports = {
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meta: {
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type: 'problem',
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docs: {
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category: 'Helpful warnings',
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description: 'Forbid any invalid exports, i.e. re-export of the same name.',
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url: (0, _docsUrl2['default'])('export') },
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schema: [] },
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create: function () {function create(context) {
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var namespace = new Map([[rootProgram, new Map()]]);
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function addNamed(name, node, parent, isType) {
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if (!namespace.has(parent)) {
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namespace.set(parent, new Map());
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}
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var named = namespace.get(parent);
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var key = isType ? '' + tsTypePrefix + String(name) : name;
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var nodes = named.get(key);
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if (nodes == null) {
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nodes = new Set();
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named.set(key, nodes);
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}
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nodes.add(node);
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}
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function getParent(node) {
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if (node.parent && node.parent.type === 'TSModuleBlock') {
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return node.parent.parent;
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}
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// just in case somehow a non-ts namespace export declaration isn't directly
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// parented to the root Program node
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return rootProgram;
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}
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return {
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ExportDefaultDeclaration: function () {function ExportDefaultDeclaration(node) {
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addNamed('default', node, getParent(node));
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}return ExportDefaultDeclaration;}(),
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ExportSpecifier: function () {function ExportSpecifier(node) {
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addNamed(
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node.exported.name || node.exported.value,
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node.exported,
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getParent(node.parent));
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}return ExportSpecifier;}(),
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ExportNamedDeclaration: function () {function ExportNamedDeclaration(node) {
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if (node.declaration == null) {return;}
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var parent = getParent(node);
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// support for old TypeScript versions
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var isTypeVariableDecl = node.declaration.kind === 'type';
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if (node.declaration.id != null) {
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if ((0, _arrayIncludes2['default'])([
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'TSTypeAliasDeclaration',
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'TSInterfaceDeclaration'],
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node.declaration.type)) {
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addNamed(node.declaration.id.name, node.declaration.id, parent, true);
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} else {
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addNamed(node.declaration.id.name, node.declaration.id, parent, isTypeVariableDecl);
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}
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}
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if (node.declaration.declarations != null) {var _iteratorNormalCompletion = true;var _didIteratorError = false;var _iteratorError = undefined;try {
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for (var _iterator = node.declaration.declarations[Symbol.iterator](), _step; !(_iteratorNormalCompletion = (_step = _iterator.next()).done); _iteratorNormalCompletion = true) {var declaration = _step.value;
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(0, _ExportMap.recursivePatternCapture)(declaration.id, function (v) {addNamed(v.name, v, parent, isTypeVariableDecl);});
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}} catch (err) {_didIteratorError = true;_iteratorError = err;} finally {try {if (!_iteratorNormalCompletion && _iterator['return']) {_iterator['return']();}} finally {if (_didIteratorError) {throw _iteratorError;}}}
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}
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}return ExportNamedDeclaration;}(),
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ExportAllDeclaration: function () {function ExportAllDeclaration(node) {
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if (node.source == null) {return;} // not sure if this is ever true
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// `export * as X from 'path'` does not conflict
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if (node.exported && node.exported.name) {return;}
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var remoteExports = _ExportMap2['default'].get(node.source.value, context);
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if (remoteExports == null) {return;}
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if (remoteExports.errors.length) {
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remoteExports.reportErrors(context, node);
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return;
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}
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var parent = getParent(node);
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var any = false;
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remoteExports.forEach(function (v, name) {
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if (name !== 'default') {
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any = true; // poor man's filter
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addNamed(name, node, parent);
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}
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});
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if (!any) {
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context.report(
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node.source, 'No named exports found in module \'' + String(
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node.source.value) + '\'.');
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}
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}return ExportAllDeclaration;}(),
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'Program:exit': function () {function ProgramExit() {var _iteratorNormalCompletion2 = true;var _didIteratorError2 = false;var _iteratorError2 = undefined;try {
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for (var _iterator2 = namespace[Symbol.iterator](), _step2; !(_iteratorNormalCompletion2 = (_step2 = _iterator2.next()).done); _iteratorNormalCompletion2 = true) {var _ref = _step2.value;var _ref2 = _slicedToArray(_ref, 2);var named = _ref2[1];var _iteratorNormalCompletion3 = true;var _didIteratorError3 = false;var _iteratorError3 = undefined;try {
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for (var _iterator3 = named[Symbol.iterator](), _step3; !(_iteratorNormalCompletion3 = (_step3 = _iterator3.next()).done); _iteratorNormalCompletion3 = true) {var _ref3 = _step3.value;var _ref4 = _slicedToArray(_ref3, 2);var name = _ref4[0];var nodes = _ref4[1];
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if (nodes.size <= 1) {continue;}
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if (isTypescriptFunctionOverloads(nodes) || isTypescriptNamespaceMerging(nodes)) {continue;}var _iteratorNormalCompletion4 = true;var _didIteratorError4 = false;var _iteratorError4 = undefined;try {
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for (var _iterator4 = nodes[Symbol.iterator](), _step4; !(_iteratorNormalCompletion4 = (_step4 = _iterator4.next()).done); _iteratorNormalCompletion4 = true) {var node = _step4.value;
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if (shouldSkipTypescriptNamespace(node, nodes)) {continue;}
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if (name === 'default') {
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context.report(node, 'Multiple default exports.');
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} else {
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context.report(
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node, 'Multiple exports of name \'' + String(
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name.replace(tsTypePrefix, '')) + '\'.');
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}
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}} catch (err) {_didIteratorError4 = true;_iteratorError4 = err;} finally {try {if (!_iteratorNormalCompletion4 && _iterator4['return']) {_iterator4['return']();}} finally {if (_didIteratorError4) {throw _iteratorError4;}}}
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}} catch (err) {_didIteratorError3 = true;_iteratorError3 = err;} finally {try {if (!_iteratorNormalCompletion3 && _iterator3['return']) {_iterator3['return']();}} finally {if (_didIteratorError3) {throw _iteratorError3;}}}
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}} catch (err) {_didIteratorError2 = true;_iteratorError2 = err;} finally {try {if (!_iteratorNormalCompletion2 && _iterator2['return']) {_iterator2['return']();}} finally {if (_didIteratorError2) {throw _iteratorError2;}}}
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}return ProgramExit;}() };
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}return create;}() };
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