1 | "use strict";
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2 | /**
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3 | * @license
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4 | * Copyright Google LLC All Rights Reserved.
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5 | *
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6 | * Use of this source code is governed by an MIT-style license that can be
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7 | * found in the LICENSE file at https://angular.io/license
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8 | */
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9 | var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
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10 | if (k2 === undefined) k2 = k;
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11 | Object.defineProperty(o, k2, { enumerable: true, get: function() { return m[k]; } });
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12 | }) : (function(o, m, k, k2) {
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13 | if (k2 === undefined) k2 = k;
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14 | o[k2] = m[k];
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15 | }));
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16 | var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
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17 | Object.defineProperty(o, "default", { enumerable: true, value: v });
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18 | }) : function(o, v) {
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19 | o["default"] = v;
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20 | });
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21 | var __importStar = (this && this.__importStar) || function (mod) {
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22 | if (mod && mod.__esModule) return mod;
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23 | var result = {};
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24 | 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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25 | __setModuleDefault(result, mod);
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26 | return result;
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27 | };
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28 | Object.defineProperty(exports, "__esModule", { value: true });
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29 | exports.elideImports = void 0;
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30 | const ts = __importStar(require("typescript"));
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31 | // Remove imports for which all identifiers have been removed.
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32 | // Needs type checker, and works even if it's not the first transformer.
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33 | // Works by removing imports for symbols whose identifiers have all been removed.
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34 | // Doesn't use the `symbol.declarations` because that previous transforms might have removed nodes
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35 | // but the type checker doesn't know.
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36 | // See https://github.com/Microsoft/TypeScript/issues/17552 for more information.
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37 | function elideImports(sourceFile, removedNodes, getTypeChecker, compilerOptions) {
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38 | const importNodeRemovals = new Set();
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39 | if (removedNodes.length === 0) {
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40 | return importNodeRemovals;
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41 | }
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42 | const typeChecker = getTypeChecker();
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43 | // Collect all imports and used identifiers
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44 | const usedSymbols = new Set();
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45 | const imports = [];
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46 | ts.forEachChild(sourceFile, function visit(node) {
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47 | var _a, _b, _c, _d, _e;
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48 | // Skip removed nodes.
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49 | if (removedNodes.includes(node)) {
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50 | return;
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51 | }
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52 | // Consider types for 'implements' as unused.
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53 | // A HeritageClause token can also be an 'AbstractKeyword'
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54 | // which in that case we should not elide the import.
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55 | if (ts.isHeritageClause(node) && node.token === ts.SyntaxKind.ImplementsKeyword) {
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56 | return;
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57 | }
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58 | // Record import and skip
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59 | if (ts.isImportDeclaration(node)) {
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60 | if (!((_a = node.importClause) === null || _a === void 0 ? void 0 : _a.isTypeOnly)) {
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61 | imports.push(node);
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62 | }
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63 | return;
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64 | }
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65 | let symbol;
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66 | if (ts.isTypeReferenceNode(node)) {
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67 | if (!compilerOptions.emitDecoratorMetadata) {
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68 | // Skip and mark as unused if emitDecoratorMetadata is disabled.
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69 | return;
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70 | }
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71 | const parent = node.parent;
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72 | let isTypeReferenceForDecoratoredNode = false;
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73 | switch (parent.kind) {
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74 | case ts.SyntaxKind.GetAccessor:
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75 | case ts.SyntaxKind.PropertyDeclaration:
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76 | case ts.SyntaxKind.MethodDeclaration:
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77 | isTypeReferenceForDecoratoredNode = !!((_b = parent.decorators) === null || _b === void 0 ? void 0 : _b.length);
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78 | break;
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79 | case ts.SyntaxKind.Parameter:
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80 | // - A constructor parameter can be decorated or the class itself is decorated.
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81 | // - The parent of the parameter is decorated example a method declaration or a set accessor.
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82 | // In all cases we need the type reference not to be elided.
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83 | isTypeReferenceForDecoratoredNode = !!(((_c = parent.decorators) === null || _c === void 0 ? void 0 : _c.length) ||
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84 | (ts.isSetAccessor(parent.parent) && !!((_d = parent.parent.decorators) === null || _d === void 0 ? void 0 : _d.length)) ||
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85 | (ts.isConstructorDeclaration(parent.parent) &&
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86 | !!((_e = parent.parent.parent.decorators) === null || _e === void 0 ? void 0 : _e.length)));
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87 | break;
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88 | }
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89 | if (isTypeReferenceForDecoratoredNode) {
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90 | symbol = typeChecker.getSymbolAtLocation(node.typeName);
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91 | }
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92 | }
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93 | else {
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94 | switch (node.kind) {
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95 | case ts.SyntaxKind.Identifier:
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96 | const parent = node.parent;
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97 | if (parent && ts.isShorthandPropertyAssignment(parent)) {
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98 | const shorthandSymbol = typeChecker.getShorthandAssignmentValueSymbol(parent);
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99 | if (shorthandSymbol) {
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100 | symbol = shorthandSymbol;
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101 | }
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102 | }
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103 | else {
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104 | symbol = typeChecker.getSymbolAtLocation(node);
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105 | }
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106 | break;
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107 | case ts.SyntaxKind.ExportSpecifier:
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108 | symbol = typeChecker.getExportSpecifierLocalTargetSymbol(node);
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109 | break;
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110 | case ts.SyntaxKind.ShorthandPropertyAssignment:
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111 | symbol = typeChecker.getShorthandAssignmentValueSymbol(node);
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112 | break;
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113 | }
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114 | }
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115 | if (symbol) {
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116 | usedSymbols.add(symbol);
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117 | }
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118 | ts.forEachChild(node, visit);
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119 | });
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120 | if (imports.length === 0) {
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121 | return importNodeRemovals;
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122 | }
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123 | const isUnused = (node) => {
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124 | // Do not remove JSX factory imports
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125 | if (node.text === compilerOptions.jsxFactory) {
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126 | return false;
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127 | }
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128 | const symbol = typeChecker.getSymbolAtLocation(node);
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129 | return symbol && !usedSymbols.has(symbol);
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130 | };
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131 | for (const node of imports) {
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132 | if (!node.importClause) {
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133 | // "import 'abc';"
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134 | continue;
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135 | }
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136 | const namedBindings = node.importClause.namedBindings;
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137 | if (namedBindings && ts.isNamespaceImport(namedBindings)) {
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138 | // "import * as XYZ from 'abc';"
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139 | if (isUnused(namedBindings.name)) {
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140 | importNodeRemovals.add(node);
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141 | }
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142 | }
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143 | else {
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144 | const specifierNodeRemovals = [];
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145 | let clausesCount = 0;
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146 | // "import { XYZ, ... } from 'abc';"
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147 | if (namedBindings && ts.isNamedImports(namedBindings)) {
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148 | let removedClausesCount = 0;
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149 | clausesCount += namedBindings.elements.length;
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150 | for (const specifier of namedBindings.elements) {
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151 | if (isUnused(specifier.name)) {
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152 | removedClausesCount++;
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153 | // in case we don't have any more namedImports we should remove the parent ie the {}
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154 | const nodeToRemove = clausesCount === removedClausesCount ? specifier.parent : specifier;
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155 | specifierNodeRemovals.push(nodeToRemove);
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156 | }
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157 | }
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158 | }
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159 | // "import XYZ from 'abc';"
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160 | if (node.importClause.name) {
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161 | clausesCount++;
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162 | if (isUnused(node.importClause.name)) {
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163 | specifierNodeRemovals.push(node.importClause.name);
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164 | }
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165 | }
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166 | if (specifierNodeRemovals.length === clausesCount) {
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167 | importNodeRemovals.add(node);
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168 | }
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169 | else {
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170 | for (const specifierNodeRemoval of specifierNodeRemovals) {
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171 | importNodeRemovals.add(specifierNodeRemoval);
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172 | }
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173 | }
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174 | }
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175 | }
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176 | return importNodeRemovals;
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177 | }
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178 | exports.elideImports = elideImports;
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