"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
 */
Object.defineProperty(exports, "__esModule", { value: true });
exports.createExternalPackagesPlugin = createExternalPackagesPlugin;
const node_path_1 = require("node:path");
const EXTERNAL_PACKAGE_RESOLUTION = Symbol('EXTERNAL_PACKAGE_RESOLUTION');
/**
 * Creates a plugin that marks any resolved path as external if it is within a node modules directory.
 * This is used instead of the esbuild `packages` option to avoid marking files that should be loaded
 * via customized loaders. This is necessary to prevent Vite development server pre-bundling errors.
 *
 * @returns An esbuild plugin.
 */
function createExternalPackagesPlugin(options) {
    const exclusions = new Set(options?.exclude);
    // Similar to esbuild, --external:@foo/bar automatically implies --external:@foo/bar/*,
    // which matches import paths like @foo/bar/baz.
    // This means all paths within the @foo/bar package are also marked as external.
    const exclusionsPrefixes = options?.exclude?.map((exclusion) => exclusion + '/') ?? [];
    const seenExclusions = new Set();
    const seenExternals = new Set();
    const seenNonExclusions = new Set();
    return {
        name: 'angular-external-packages',
        setup(build) {
            // Find all loader keys that are not using the 'file' loader.
            // The 'file' loader is automatically handled by Vite and does not need exclusion.
            const loaderOptionKeys = build.initialOptions.loader &&
                Object.entries(build.initialOptions.loader)
                    .filter(([, value]) => value !== 'file')
                    .map(([key]) => key);
            // Safe to use native packages external option if no loader options or exclusions present
            if (!exclusions.size && !loaderOptionKeys?.length) {
                build.initialOptions.packages = 'external';
                return;
            }
            const loaderFileExtensions = new Set(loaderOptionKeys);
            // Only attempt resolve of non-relative and non-absolute paths
            build.onResolve({ filter: /^[^./]/ }, async (args) => {
                if (args.pluginData?.[EXTERNAL_PACKAGE_RESOLUTION]) {
                    return null;
                }
                if (seenExternals.has(args.path)) {
                    return { external: true };
                }
                if (exclusions.has(args.path) || seenExclusions.has(args.path)) {
                    return null;
                }
                if (!seenNonExclusions.has(args.path)) {
                    for (const exclusion of exclusionsPrefixes) {
                        if (args.path.startsWith(exclusion)) {
                            seenExclusions.add(args.path);
                            return null;
                        }
                    }
                    seenNonExclusions.add(args.path);
                }
                const { importer, kind, resolveDir, namespace, pluginData = {} } = args;
                pluginData[EXTERNAL_PACKAGE_RESOLUTION] = true;
                const result = await build.resolve(args.path, {
                    importer,
                    kind,
                    namespace,
                    pluginData,
                    resolveDir,
                });
                // Return result if unable to resolve
                if (!result.path) {
                    return result;
                }
                // Return if explicitly marked external (externalDependencies option)
                if (result.external) {
                    seenExternals.add(args.path);
                    return { external: true };
                }
                // Allow customized loaders to run against configured paths regardless of location
                if (loaderFileExtensions.has((0, node_path_1.extname)(result.path))) {
                    return result;
                }
                // Mark paths from a node modules directory as external
                if (/[\\/]node_modules[\\/]/.test(result.path)) {
                    seenExternals.add(args.path);
                    return { external: true };
                }
                // Otherwise return original result
                return result;
            });
        },
    };
}
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