| 'use strict';var _docsUrl = require('../docsUrl');var _docsUrl2 = _interopRequireDefault(_docsUrl); |
| var _object = require('object.values');var _object2 = _interopRequireDefault(_object); |
| var _arrayPrototype = require('array.prototype.flat');var _arrayPrototype2 = _interopRequireDefault(_arrayPrototype);function _interopRequireDefault(obj) {return obj && obj.__esModule ? obj : { default: obj };} |
| |
| const meta = { |
| type: 'suggestion', |
| docs: { |
| url: (0, _docsUrl2.default)('group-exports') } |
| |
| |
| /* eslint-disable max-len */ }; |
| const errors = { |
| ExportNamedDeclaration: 'Multiple named export declarations; consolidate all named exports into a single export declaration', |
| AssignmentExpression: 'Multiple CommonJS exports; consolidate all exports into a single assignment to `module.exports`' |
| |
| /* eslint-enable max-len */ |
| |
| /** |
| * Returns an array with names of the properties in the accessor chain for MemberExpression nodes |
| * |
| * Example: |
| * |
| * `module.exports = {}` => ['module', 'exports'] |
| * `module.exports.property = true` => ['module', 'exports', 'property'] |
| * |
| * @param {Node} node AST Node (MemberExpression) |
| * @return {Array} Array with the property names in the chain |
| * @private |
| */ }; |
| function accessorChain(node) { |
| const chain = []; |
| |
| do { |
| chain.unshift(node.property.name); |
| |
| if (node.object.type === 'Identifier') { |
| chain.unshift(node.object.name); |
| break; |
| } |
| |
| node = node.object; |
| } while (node.type === 'MemberExpression'); |
| |
| return chain; |
| } |
| |
| function create(context) { |
| const nodes = { |
| modules: { |
| set: new Set(), |
| sources: {} }, |
| |
| types: { |
| set: new Set(), |
| sources: {} }, |
| |
| commonjs: { |
| set: new Set() } }; |
| |
| |
| |
| return { |
| ExportNamedDeclaration(node) { |
| let target = node.exportKind === 'type' ? nodes.types : nodes.modules; |
| if (!node.source) { |
| target.set.add(node); |
| } else if (Array.isArray(target.sources[node.source.value])) { |
| target.sources[node.source.value].push(node); |
| } else { |
| target.sources[node.source.value] = [node]; |
| } |
| }, |
| |
| AssignmentExpression(node) { |
| if (node.left.type !== 'MemberExpression') { |
| return; |
| } |
| |
| const chain = accessorChain(node.left); |
| |
| // Assignments to module.exports |
| // Deeper assignments are ignored since they just modify what's already being exported |
| // (ie. module.exports.exported.prop = true is ignored) |
| if (chain[0] === 'module' && chain[1] === 'exports' && chain.length <= 3) { |
| nodes.commonjs.set.add(node); |
| return; |
| } |
| |
| // Assignments to exports (exports.* = *) |
| if (chain[0] === 'exports' && chain.length === 2) { |
| nodes.commonjs.set.add(node); |
| return; |
| } |
| }, |
| |
| 'Program:exit': function onExit() { |
| // Report multiple `export` declarations (ES2015 modules) |
| if (nodes.modules.set.size > 1) { |
| nodes.modules.set.forEach(node => { |
| context.report({ |
| node, |
| message: errors[node.type] }); |
| |
| }); |
| } |
| |
| // Report multiple `aggregated exports` from the same module (ES2015 modules) |
| (0, _arrayPrototype2.default)((0, _object2.default)(nodes.modules.sources). |
| filter(nodesWithSource => Array.isArray(nodesWithSource) && nodesWithSource.length > 1)). |
| forEach(node => { |
| context.report({ |
| node, |
| message: errors[node.type] }); |
| |
| }); |
| |
| // Report multiple `export type` declarations (FLOW ES2015 modules) |
| if (nodes.types.set.size > 1) { |
| nodes.types.set.forEach(node => { |
| context.report({ |
| node, |
| message: errors[node.type] }); |
| |
| }); |
| } |
| |
| // Report multiple `aggregated type exports` from the same module (FLOW ES2015 modules) |
| (0, _arrayPrototype2.default)((0, _object2.default)(nodes.types.sources). |
| filter(nodesWithSource => Array.isArray(nodesWithSource) && nodesWithSource.length > 1)). |
| forEach(node => { |
| context.report({ |
| node, |
| message: errors[node.type] }); |
| |
| }); |
| |
| // Report multiple `module.exports` assignments (CommonJS) |
| if (nodes.commonjs.set.size > 1) { |
| nodes.commonjs.set.forEach(node => { |
| context.report({ |
| node, |
| message: errors[node.type] }); |
| |
| }); |
| } |
| } }; |
| |
| } |
| |
| module.exports = { |
| meta, |
| create }; |
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consolidate all named exports into a single export declaration',\n  AssignmentExpression: 'Multiple CommonJS exports; consolidate all exports into a single assignment to `module.exports`',\n}\n/* eslint-enable max-len */\n\n/**\n * Returns an array with names of the properties in the accessor chain for MemberExpression nodes\n *\n * Example:\n *\n * `module.exports = {}` => ['module', 'exports']\n * `module.exports.property = true` => ['module', 'exports', 'property']\n *\n * @param     {Node}    node    AST Node (MemberExpression)\n * @return    {Array}           Array with the property names in the chain\n * @private\n */\nfunction accessorChain(node) {\n  const chain = []\n\n  do {\n    chain.unshift(node.property.name)\n\n    if (node.object.type === 'Identifier') {\n      chain.unshift(node.object.name)\n      break\n    }\n\n    node = node.object\n  } while (node.type === 'MemberExpression')\n\n  return chain\n}\n\nfunction create(context) {\n  const nodes = {\n    modules: {\n      set: new Set(),\n      sources: {},\n    },\n    types: {\n      set: new Set(),\n      sources: {},\n    },\n    commonjs: {\n      set: new Set(),\n    },\n  }\n\n  return {\n    ExportNamedDeclaration(node) {\n      let target = node.exportKind === 'type' ? nodes.types : nodes.modules\n      if (!node.source) {\n        target.set.add(node)\n      } else if (Array.isArray(target.sources[node.source.value])) {\n        target.sources[node.source.value].push(node)\n      } else {\n        target.sources[node.source.value] = [node]\n      }\n    },\n\n    AssignmentExpression(node) {\n      if (node.left.type !== 'MemberExpression') {\n        return\n      }\n\n      const chain = accessorChain(node.left)\n\n      // Assignments to module.exports\n      // Deeper assignments are ignored since they just modify what's already being exported\n      // (ie. module.exports.exported.prop = true is ignored)\n      if (chain[0] === 'module' && chain[1] === 'exports' && chain.length <= 3) {\n        nodes.commonjs.set.add(node)\n        return\n      }\n\n      // Assignments to exports (exports.* = *)\n      if (chain[0] === 'exports' && chain.length === 2) {\n        nodes.commonjs.set.add(node)\n        return\n      }\n    },\n\n    'Program:exit': function onExit() {\n      // Report multiple `export` declarations (ES2015 modules)\n      if (nodes.modules.set.size > 1) {\n        nodes.modules.set.forEach(node => {\n          context.report({\n            node,\n            message: errors[node.type],\n          })\n        })\n      }\n\n      // Report multiple `aggregated exports` from the same module (ES2015 modules)\n      flat(values(nodes.modules.sources)\n        .filter(nodesWithSource => Array.isArray(nodesWithSource) && nodesWithSource.length > 1))\n        .forEach((node) => {\n          context.report({\n            node,\n            message: errors[node.type],\n          })\n        })\n\n      // Report multiple `export type` declarations (FLOW ES2015 modules)\n      if (nodes.types.set.size > 1) {\n        nodes.types.set.forEach(node => {\n          context.report({\n            node,\n            message: errors[node.type],\n          })\n        })\n      }\n\n      // Report multiple `aggregated type exports` from the same module (FLOW ES2015 modules)\n      flat(values(nodes.types.sources)\n        .filter(nodesWithSource => Array.isArray(nodesWithSource) && nodesWithSource.length > 1))\n        .forEach((node) => {\n          context.report({\n            node,\n            message: errors[node.type],\n          })\n        })\n\n      // Report multiple `module.exports` assignments (CommonJS)\n      if (nodes.commonjs.set.size > 1) {\n        nodes.commonjs.set.forEach(node => {\n          context.report({\n            node,\n            message: errors[node.type],\n          })\n        })\n      }\n    },\n  }\n}\n\nmodule.exports = {\n  meta,\n  create,\n}\n"]} |