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'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 };}
var meta = {
type: 'suggestion',
docs: {
category: 'Style guide',
description: 'Prefer named exports to be grouped together in a single export declaration',
url: (0, _docsUrl2['default'])('group-exports') } };
/* eslint-disable max-len */
var 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) {
var 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) {
var nodes = {
modules: {
set: new Set(),
sources: {} },
types: {
set: new Set(),
sources: {} },
commonjs: {
set: new Set() } };
return {
ExportNamedDeclaration: function () {function ExportNamedDeclaration(node) {
var 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];
}
}return ExportNamedDeclaration;}(),
AssignmentExpression: function () {function AssignmentExpression(node) {
if (node.left.type !== 'MemberExpression') {
return;
}
var 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;
}
}return AssignmentExpression;}(),
'Program:exit': function () {function onExit() {
// Report multiple `export` declarations (ES2015 modules)
if (nodes.modules.set.size > 1) {
nodes.modules.set.forEach(function (node) {
context.report({
node: 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(function (nodesWithSource) {return Array.isArray(nodesWithSource) && nodesWithSource.length > 1;})).
forEach(function (node) {
context.report({
node: node,
message: errors[node.type] });
});
// Report multiple `export type` declarations (FLOW ES2015 modules)
if (nodes.types.set.size > 1) {
nodes.types.set.forEach(function (node) {
context.report({
node: 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(function (nodesWithSource) {return Array.isArray(nodesWithSource) && nodesWithSource.length > 1;})).
forEach(function (node) {
context.report({
node: node,
message: errors[node.type] });
});
// Report multiple `module.exports` assignments (CommonJS)
if (nodes.commonjs.set.size > 1) {
nodes.commonjs.set.forEach(function (node) {
context.report({
node: node,
message: errors[node.type] });
});
}
}return onExit;}() };
}
module.exports = {
meta: meta,
create: 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      const 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"]}