"use strict";
/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.dev/license
 */
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.replaceBootstrap = replaceBootstrap;
exports.elideImports = elideImports;
const typescript_1 = __importDefault(require("typescript"));
/**
 * The name of the Angular platform that should be replaced within
 * bootstrap call expressions to support AOT.
 */
const PLATFORM_BROWSER_DYNAMIC_NAME = 'platformBrowserDynamic';
function replaceBootstrap(getTypeChecker) {
    return (context) => {
        let bootstrapImport;
        let bootstrapNamespace;
        const replacedNodes = [];
        const nodeFactory = context.factory;
        const visitNode = (node) => {
            if (typescript_1.default.isCallExpression(node) && typescript_1.default.isIdentifier(node.expression)) {
                const target = node.expression;
                if (target.text === PLATFORM_BROWSER_DYNAMIC_NAME) {
                    if (!bootstrapNamespace) {
                        bootstrapNamespace = nodeFactory.createUniqueName('__NgCli_bootstrap_');
                        bootstrapImport = nodeFactory.createImportDeclaration(undefined, nodeFactory.createImportClause(undefined, undefined, nodeFactory.createNamespaceImport(bootstrapNamespace)), nodeFactory.createStringLiteral('@angular/platform-browser'));
                    }
                    replacedNodes.push(target);
                    return nodeFactory.updateCallExpression(node, nodeFactory.createPropertyAccessExpression(bootstrapNamespace, 'platformBrowser'), node.typeArguments, node.arguments);
                }
            }
            return typescript_1.default.visitEachChild(node, visitNode, context);
        };
        return (sourceFile) => {
            if (!sourceFile.text.includes(PLATFORM_BROWSER_DYNAMIC_NAME)) {
                return sourceFile;
            }
            let updatedSourceFile = typescript_1.default.visitEachChild(sourceFile, visitNode, context);
            if (bootstrapImport) {
                // Remove any unused platform browser dynamic imports
                const removals = elideImports(updatedSourceFile, replacedNodes, getTypeChecker, context.getCompilerOptions());
                if (removals.size > 0) {
                    updatedSourceFile = typescript_1.default.visitEachChild(updatedSourceFile, (node) => (removals.has(node) ? undefined : node), context);
                }
                // Add new platform browser import
                return nodeFactory.updateSourceFile(updatedSourceFile, typescript_1.default.setTextRange(nodeFactory.createNodeArray([bootstrapImport, ...updatedSourceFile.statements]), sourceFile.statements));
            }
            else {
                return updatedSourceFile;
            }
        };
    };
}
// Remove imports for which all identifiers have been removed.
// Needs type checker, and works even if it's not the first transformer.
// Works by removing imports for symbols whose identifiers have all been removed.
// Doesn't use the `symbol.declarations` because that previous transforms might have removed nodes
// but the type checker doesn't know.
// See https://github.com/Microsoft/TypeScript/issues/17552 for more information.
function elideImports(sourceFile, removedNodes, getTypeChecker, compilerOptions) {
    const importNodeRemovals = new Set();
    if (removedNodes.length === 0) {
        return importNodeRemovals;
    }
    const typeChecker = getTypeChecker();
    // Collect all imports and used identifiers
    const usedSymbols = new Set();
    const imports = [];
    typescript_1.default.forEachChild(sourceFile, function visit(node) {
        // Skip removed nodes.
        if (removedNodes.includes(node)) {
            return;
        }
        // Consider types for 'implements' as unused.
        // A HeritageClause token can also be an 'AbstractKeyword'
        // which in that case we should not elide the import.
        if (typescript_1.default.isHeritageClause(node) && node.token === typescript_1.default.SyntaxKind.ImplementsKeyword) {
            return;
        }
        // Record import and skip
        if (typescript_1.default.isImportDeclaration(node)) {
            if (!node.importClause?.isTypeOnly) {
                imports.push(node);
            }
            return;
        }
        // Type reference imports do not need to be emitted when emitDecoratorMetadata is disabled.
        if (typescript_1.default.isTypeReferenceNode(node) && !compilerOptions.emitDecoratorMetadata) {
            return;
        }
        let symbol;
        switch (node.kind) {
            case typescript_1.default.SyntaxKind.Identifier:
                if (node.parent && typescript_1.default.isShorthandPropertyAssignment(node.parent)) {
                    const shorthandSymbol = typeChecker.getShorthandAssignmentValueSymbol(node.parent);
                    if (shorthandSymbol) {
                        symbol = shorthandSymbol;
                    }
                }
                else {
                    symbol = typeChecker.getSymbolAtLocation(node);
                }
                break;
            case typescript_1.default.SyntaxKind.ExportSpecifier:
                symbol = typeChecker.getExportSpecifierLocalTargetSymbol(node);
                break;
            case typescript_1.default.SyntaxKind.ShorthandPropertyAssignment:
                symbol = typeChecker.getShorthandAssignmentValueSymbol(node);
                break;
        }
        if (symbol) {
            usedSymbols.add(symbol);
        }
        typescript_1.default.forEachChild(node, visit);
    });
    if (imports.length === 0) {
        return importNodeRemovals;
    }
    const isUnused = (node) => {
        // Do not remove JSX factory imports
        if (node.text === compilerOptions.jsxFactory) {
            return false;
        }
        const symbol = typeChecker.getSymbolAtLocation(node);
        return symbol && !usedSymbols.has(symbol);
    };
    for (const node of imports) {
        if (!node.importClause) {
            // "import 'abc';"
            continue;
        }
        const namedBindings = node.importClause.namedBindings;
        if (namedBindings && typescript_1.default.isNamespaceImport(namedBindings)) {
            // "import * as XYZ from 'abc';"
            if (isUnused(namedBindings.name)) {
                importNodeRemovals.add(node);
            }
        }
        else {
            const specifierNodeRemovals = [];
            let clausesCount = 0;
            // "import { XYZ, ... } from 'abc';"
            if (namedBindings && typescript_1.default.isNamedImports(namedBindings)) {
                let removedClausesCount = 0;
                clausesCount += namedBindings.elements.length;
                for (const specifier of namedBindings.elements) {
                    if (specifier.isTypeOnly || isUnused(specifier.name)) {
                        removedClausesCount++;
                        // in case we don't have any more namedImports we should remove the parent ie the {}
                        const nodeToRemove = clausesCount === removedClausesCount ? specifier.parent : specifier;
                        specifierNodeRemovals.push(nodeToRemove);
                    }
                }
            }
            // "import XYZ from 'abc';"
            if (node.importClause.name) {
                clausesCount++;
                if (node.importClause.isTypeOnly || isUnused(node.importClause.name)) {
                    specifierNodeRemovals.push(node.importClause.name);
                }
            }
            if (specifierNodeRemovals.length === clausesCount) {
                importNodeRemovals.add(node);
            }
            else {
                for (const specifierNodeRemoval of specifierNodeRemovals) {
                    importNodeRemovals.add(specifierNodeRemoval);
                }
            }
        }
    }
    return importNodeRemovals;
}
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