1 | "use strict";
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2 | var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
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3 | if (k2 === undefined) k2 = k;
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4 | Object.defineProperty(o, k2, { enumerable: true, get: function() { return m[k]; } });
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5 | }) : (function(o, m, k, k2) {
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6 | if (k2 === undefined) k2 = k;
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7 | o[k2] = m[k];
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8 | }));
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9 | var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
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10 | Object.defineProperty(o, "default", { enumerable: true, value: v });
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11 | }) : function(o, v) {
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12 | o["default"] = v;
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13 | });
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14 | var __importStar = (this && this.__importStar) || function (mod) {
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15 | if (mod && mod.__esModule) return mod;
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16 | var result = {};
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17 | if (mod != null) for (var k in mod) if (k !== "default" && Object.prototype.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
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18 | __setModuleDefault(result, mod);
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19 | return result;
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20 | };
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21 | Object.defineProperty(exports, "__esModule", { value: true });
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22 | const utils_1 = require("@typescript-eslint/utils");
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23 | const ts = __importStar(require("typescript"));
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24 | const tsutils = __importStar(require("tsutils"));
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25 | const util = __importStar(require("../util"));
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26 | exports.default = util.createRule({
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27 | name: 'no-unnecessary-qualifier',
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28 | meta: {
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29 | docs: {
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30 | description: 'Warns when a namespace qualifier is unnecessary',
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31 | recommended: false,
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32 | requiresTypeChecking: true,
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33 | },
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34 | fixable: 'code',
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35 | messages: {
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36 | unnecessaryQualifier: "Qualifier is unnecessary since '{{ name }}' is in scope.",
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37 | },
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38 | schema: [],
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39 | type: 'suggestion',
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40 | },
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41 | defaultOptions: [],
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42 | create(context) {
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43 | const namespacesInScope = [];
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44 | let currentFailedNamespaceExpression = null;
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45 | const parserServices = util.getParserServices(context);
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46 | const esTreeNodeToTSNodeMap = parserServices.esTreeNodeToTSNodeMap;
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47 | const program = parserServices.program;
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48 | const checker = program.getTypeChecker();
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49 | const sourceCode = context.getSourceCode();
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50 | function tryGetAliasedSymbol(symbol, checker) {
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51 | return tsutils.isSymbolFlagSet(symbol, ts.SymbolFlags.Alias)
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52 | ? checker.getAliasedSymbol(symbol)
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53 | : null;
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54 | }
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55 | function symbolIsNamespaceInScope(symbol) {
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56 | var _a;
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57 | const symbolDeclarations = (_a = symbol.getDeclarations()) !== null && _a !== void 0 ? _a : [];
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58 | if (symbolDeclarations.some(decl => namespacesInScope.some(ns => ns === decl))) {
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59 | return true;
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60 | }
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61 | const alias = tryGetAliasedSymbol(symbol, checker);
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62 | return alias !== null && symbolIsNamespaceInScope(alias);
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63 | }
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64 | function getSymbolInScope(node, flags, name) {
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65 |
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66 | const scope = checker.getSymbolsInScope(node, flags);
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67 | return scope.find(scopeSymbol => scopeSymbol.name === name);
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68 | }
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69 | function symbolsAreEqual(accessed, inScope) {
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70 | return accessed === checker.getExportSymbolOfSymbol(inScope);
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71 | }
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72 | function qualifierIsUnnecessary(qualifier, name) {
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73 | const tsQualifier = esTreeNodeToTSNodeMap.get(qualifier);
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74 | const tsName = esTreeNodeToTSNodeMap.get(name);
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75 | const namespaceSymbol = checker.getSymbolAtLocation(tsQualifier);
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76 | if (typeof namespaceSymbol === 'undefined' ||
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77 | !symbolIsNamespaceInScope(namespaceSymbol)) {
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78 | return false;
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79 | }
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80 | const accessedSymbol = checker.getSymbolAtLocation(tsName);
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81 | if (typeof accessedSymbol === 'undefined') {
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82 | return false;
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83 | }
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84 |
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85 | const fromScope = getSymbolInScope(tsQualifier, accessedSymbol.flags, sourceCode.getText(name));
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86 | return (typeof fromScope === 'undefined' ||
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87 | symbolsAreEqual(accessedSymbol, fromScope));
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88 | }
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89 | function visitNamespaceAccess(node, qualifier, name) {
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90 |
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91 | if (!currentFailedNamespaceExpression &&
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92 | qualifierIsUnnecessary(qualifier, name)) {
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93 | currentFailedNamespaceExpression = node;
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94 | context.report({
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95 | node: qualifier,
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96 | messageId: 'unnecessaryQualifier',
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97 | data: {
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98 | name: sourceCode.getText(name),
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99 | },
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100 | fix(fixer) {
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101 | return fixer.removeRange([qualifier.range[0], name.range[0]]);
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102 | },
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103 | });
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104 | }
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105 | }
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106 | function enterDeclaration(node) {
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107 | namespacesInScope.push(esTreeNodeToTSNodeMap.get(node));
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108 | }
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109 | function exitDeclaration() {
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110 | namespacesInScope.pop();
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111 | }
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112 | function resetCurrentNamespaceExpression(node) {
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113 | if (node === currentFailedNamespaceExpression) {
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114 | currentFailedNamespaceExpression = null;
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115 | }
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116 | }
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117 | function isPropertyAccessExpression(node) {
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118 | return node.type === utils_1.AST_NODE_TYPES.MemberExpression && !node.computed;
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119 | }
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120 | function isEntityNameExpression(node) {
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121 | return (node.type === utils_1.AST_NODE_TYPES.Identifier ||
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122 | (isPropertyAccessExpression(node) &&
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123 | isEntityNameExpression(node.object)));
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124 | }
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125 | return {
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126 | TSModuleDeclaration: enterDeclaration,
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127 | TSEnumDeclaration: enterDeclaration,
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128 | 'ExportNamedDeclaration[declaration.type="TSModuleDeclaration"]': enterDeclaration,
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129 | 'ExportNamedDeclaration[declaration.type="TSEnumDeclaration"]': enterDeclaration,
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130 | 'TSModuleDeclaration:exit': exitDeclaration,
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131 | 'TSEnumDeclaration:exit': exitDeclaration,
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132 | 'ExportNamedDeclaration[declaration.type="TSModuleDeclaration"]:exit': exitDeclaration,
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133 | 'ExportNamedDeclaration[declaration.type="TSEnumDeclaration"]:exit': exitDeclaration,
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134 | TSQualifiedName(node) {
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135 | visitNamespaceAccess(node, node.left, node.right);
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136 | },
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137 | 'MemberExpression[computed=false]': function (node) {
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138 | const property = node.property;
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139 | if (isEntityNameExpression(node.object)) {
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140 | visitNamespaceAccess(node, node.object, property);
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141 | }
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142 | },
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143 | 'TSQualifiedName:exit': resetCurrentNamespaceExpression,
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144 | 'MemberExpression:exit': resetCurrentNamespaceExpression,
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145 | };
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146 | },
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147 | });
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148 |
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