'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");}};}(); /** * @fileOverview Ensures that no imported module imports the linted module. * @author Ben Mosher */ var _resolve = require('eslint-module-utils/resolve');var _resolve2 = _interopRequireDefault(_resolve); var _builder = require('../exportMap/builder');var _builder2 = _interopRequireDefault(_builder); var _scc = require('../scc');var _scc2 = _interopRequireDefault(_scc); var _importType = require('../core/importType'); var _moduleVisitor = require('eslint-module-utils/moduleVisitor');var _moduleVisitor2 = _interopRequireDefault(_moduleVisitor); var _docsUrl = require('../docsUrl');var _docsUrl2 = _interopRequireDefault(_docsUrl);function _interopRequireDefault(obj) {return obj && obj.__esModule ? obj : { 'default': obj };}function _toConsumableArray(arr) {if (Array.isArray(arr)) {for (var i = 0, arr2 = Array(arr.length); i < arr.length; i++) {arr2[i] = arr[i];}return arr2;} else {return Array.from(arr);}} var traversed = new Set(); function routeString(route) { return route.map(function (s) {return String(s.value) + ':' + String(s.loc.start.line);}).join('=>'); } module.exports = { meta: { type: 'suggestion', docs: { category: 'Static analysis', description: 'Forbid a module from importing a module with a dependency path back to itself.', url: (0, _docsUrl2['default'])('no-cycle') }, schema: [(0, _moduleVisitor.makeOptionsSchema)({ maxDepth: { anyOf: [ { description: 'maximum dependency depth to traverse', type: 'integer', minimum: 1 }, { 'enum': ['∞'], type: 'string' }] }, ignoreExternal: { description: 'ignore external modules', type: 'boolean', 'default': false }, allowUnsafeDynamicCyclicDependency: { description: 'Allow cyclic dependency if there is at least one dynamic import in the chain', type: 'boolean', 'default': false }, disableScc: { description: 'When true, don\'t calculate a strongly-connected-components graph. SCC is used to reduce the time-complexity of cycle detection, but adds overhead.', type: 'boolean', 'default': false } })] }, create: function () {function create(context) { var myPath = context.getPhysicalFilename ? context.getPhysicalFilename() : context.getFilename(); if (myPath === '') {return {};} // can't cycle-check a non-file var options = context.options[0] || {}; var maxDepth = typeof options.maxDepth === 'number' ? options.maxDepth : Infinity; var ignoreModule = function () {function ignoreModule(name) {return options.ignoreExternal && (0, _importType.isExternalModule)( name, (0, _resolve2['default'])(name, context), context);}return ignoreModule;}(); var scc = options.disableScc ? {} : _scc2['default'].get(myPath, context); function checkSourceValue(sourceNode, importer) { if (ignoreModule(sourceNode.value)) { return; // ignore external modules } if ( options.allowUnsafeDynamicCyclicDependency && ( // Ignore `import()` importer.type === 'ImportExpression' // `require()` calls are always checked (if possible) || importer.type === 'CallExpression' && importer.callee.name !== 'require')) { return; // cycle via dynamic import allowed by config } if ( importer.type === 'ImportDeclaration' && ( // import type { Foo } (TS and Flow) importer.importKind === 'type' // import { type Foo } (Flow) || importer.specifiers.every(function (_ref) {var importKind = _ref.importKind;return importKind === 'type';}))) { return; // ignore type imports } var imported = _builder2['default'].get(sourceNode.value, context); if (imported == null) { return; // no-unresolved territory } if (imported.path === myPath) { return; // no-self-import territory } /* If we're in the same Strongly Connected Component, * Then there exists a path from each node in the SCC to every other node in the SCC, * Then there exists at least one path from them to us and from us to them, * Then we have a cycle between us. */ var hasDependencyCycle = options.disableScc || scc[myPath] === scc[imported.path]; if (!hasDependencyCycle) { return; } var untraversed = [{ mget: function () {function mget() {return imported;}return mget;}(), route: [] }]; function detectCycle(_ref2) {var mget = _ref2.mget,route = _ref2.route; var m = mget(); if (m == null) {return;} if (traversed.has(m.path)) {return;} traversed.add(m.path);var _iteratorNormalCompletion = true;var _didIteratorError = false;var _iteratorError = undefined;try { for (var _iterator = m.imports[Symbol.iterator](), _step; !(_iteratorNormalCompletion = (_step = _iterator.next()).done); _iteratorNormalCompletion = true) {var _ref3 = _step.value;var _ref4 = _slicedToArray(_ref3, 2);var path = _ref4[0];var _ref4$ = _ref4[1];var getter = _ref4$.getter;var declarations = _ref4$.declarations; // If we're in different SCCs, we can't have a circular dependency if (!options.disableScc && scc[myPath] !== scc[path]) {continue;} if (traversed.has(path)) {continue;} var toTraverse = [].concat(_toConsumableArray(declarations)).filter(function (_ref5) {var source = _ref5.source,isOnlyImportingTypes = _ref5.isOnlyImportingTypes;return !ignoreModule(source.value) // Ignore only type imports && !isOnlyImportingTypes;}); /* If cyclic dependency is allowed via dynamic import, skip checking if any module is imported dynamically */ if (options.allowUnsafeDynamicCyclicDependency && toTraverse.some(function (d) {return d.dynamic;})) {return;} /* Only report as a cycle if there are any import declarations that are considered by the rule. 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* @fileOverview Ensures that no imported module imports the linted module.\n * @author Ben Mosher\n */\n\nimport resolve from 'eslint-module-utils/resolve';\nimport ExportMapBuilder from '../exportMap/builder';\nimport StronglyConnectedComponentsBuilder from '../scc';\nimport { isExternalModule } from '../core/importType';\nimport moduleVisitor, { makeOptionsSchema } from 'eslint-module-utils/moduleVisitor';\nimport docsUrl from '../docsUrl';\n\nconst traversed = new Set();\n\nfunction routeString(route) {\n  return route.map((s) => `${s.value}:${s.loc.start.line}`).join('=>');\n}\n\nmodule.exports = {\n  meta: {\n    type: 'suggestion',\n    docs: {\n      category: 'Static analysis',\n      description: 'Forbid a module from importing a module with a dependency path back to itself.',\n      url: docsUrl('no-cycle'),\n    },\n    schema: [makeOptionsSchema({\n      maxDepth: {\n        anyOf: [\n          {\n            description: 'maximum dependency depth to traverse',\n            type: 'integer',\n            minimum: 1,\n          },\n          {\n            enum: ['∞'],\n            type: 'string',\n          },\n        ],\n      },\n      ignoreExternal: {\n        description: 'ignore external modules',\n        type: 'boolean',\n        default: false,\n      },\n      allowUnsafeDynamicCyclicDependency: {\n        description: 'Allow cyclic dependency if there is at least one dynamic import in the chain',\n        type: 'boolean',\n        default: false,\n      },\n      disableScc: {\n        description: 'When true, don\\'t calculate a strongly-connected-components graph. SCC is used to reduce the time-complexity of cycle detection, but adds overhead.',\n        type: 'boolean',\n        default: false,\n      },\n    })],\n  },\n\n  create(context) {\n    const myPath = context.getPhysicalFilename ? context.getPhysicalFilename() : context.getFilename();\n    if (myPath === '<text>') { return {}; } // can't cycle-check a non-file\n\n    const options = context.options[0] || {};\n    const maxDepth = typeof options.maxDepth === 'number' ? options.maxDepth : Infinity;\n    const ignoreModule = (name) => options.ignoreExternal && isExternalModule(\n      name,\n      resolve(name, context),\n      context,\n    );\n\n    const scc = options.disableScc ? {} : StronglyConnectedComponentsBuilder.get(myPath, context);\n\n    function checkSourceValue(sourceNode, importer) {\n      if (ignoreModule(sourceNode.value)) {\n        return; // ignore external modules\n      }\n      if (\n        options.allowUnsafeDynamicCyclicDependency && (\n          // Ignore `import()`\n          importer.type === 'ImportExpression'\n          // `require()` calls are always checked (if possible)\n          || importer.type === 'CallExpression' && importer.callee.name !== 'require'\n        )\n      ) {\n        return; // cycle via dynamic import allowed by config\n      }\n\n      if (\n        importer.type === 'ImportDeclaration' && (\n          // import type { Foo } (TS and Flow)\n          importer.importKind === 'type'\n          // import { type Foo } (Flow)\n          || importer.specifiers.every(({ importKind }) => importKind === 'type')\n        )\n      ) {\n        return; // ignore type imports\n      }\n\n      const imported = ExportMapBuilder.get(sourceNode.value, context);\n\n      if (imported == null) {\n        return;  // no-unresolved territory\n      }\n\n      if (imported.path === myPath) {\n        return;  // no-self-import territory\n      }\n\n      /* If we're in the same Strongly Connected Component,\n       * Then there exists a path from each node in the SCC to every other node in the SCC,\n       * Then there exists at least one path from them to us and from us to them,\n       * Then we have a cycle between us.\n       */\n      const hasDependencyCycle = options.disableScc || scc[myPath] === scc[imported.path];\n      if (!hasDependencyCycle) {\n        return;\n      }\n\n      const untraversed = [{ mget: () => imported, route: [] }];\n      function detectCycle({ mget, route }) {\n        const m = mget();\n        if (m == null) { return; }\n        if (traversed.has(m.path)) { return; }\n        traversed.add(m.path);\n\n        for (const [path, { getter, declarations }] of m.imports) {\n          // If we're in different SCCs, we can't have a circular dependency\n          if (!options.disableScc && scc[myPath] !== scc[path]) { continue; }\n\n          if (traversed.has(path)) { continue; }\n          const toTraverse = [...declarations].filter(({ source, isOnlyImportingTypes }) => !ignoreModule(source.value)\n            // Ignore only type imports\n            && !isOnlyImportingTypes,\n          );\n\n          /*\n          If cyclic dependency is allowed via dynamic import, skip checking if any module is imported dynamically\n          */\n          if (options.allowUnsafeDynamicCyclicDependency && toTraverse.some((d) => d.dynamic)) { return; }\n\n          /*\n          Only report as a cycle if there are any import declarations that are considered by\n          the rule. For example:\n\n          a.ts:\n          import { foo } from './b' // should not be reported as a cycle\n\n          b.ts:\n          import type { Bar } from './a'\n          */\n          if (path === myPath && toTraverse.length > 0) { return true; }\n          if (route.length + 1 < maxDepth) {\n            for (const { source } of toTraverse) {\n              untraversed.push({ mget: getter, route: route.concat(source) });\n            }\n          }\n        }\n      }\n\n      while (untraversed.length > 0) {\n        const next = untraversed.shift(); // bfs!\n        if (detectCycle(next)) {\n          const message = next.route.length > 0\n            ? `Dependency cycle via ${routeString(next.route)}`\n            : 'Dependency cycle detected.';\n          context.report(importer, message);\n          return;\n        }\n      }\n    }\n\n    return Object.assign(moduleVisitor(checkSourceValue, context.options[0]), {\n      'Program:exit'() {\n        traversed.clear();\n      },\n    });\n  },\n};\n"]}