"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.addNgcmAttribute = addNgcmAttribute;
const html_rewriting_stream_1 = require("./html-rewriting-stream");
/**
 * Defines a name of an attribute that is added to the `<body>` tag
 * in the `index.html` file in case a given route was configured
 * with `RenderMode.Client`. 'cm' is an abbreviation for "Client Mode".
 *
 * @see https://github.com/angular/angular/pull/58004
 */
const CLIENT_RENDER_MODE_FLAG = 'ngcm';
/**
 * Transforms the provided HTML by adding the `ngcm` attribute to the `<body>` tag.
 * This is used in the client-side rendered (CSR) version of `index.html` to prevent hydration warnings.
 *
 * @param html The HTML markup to be transformed.
 * @returns A promise that resolves to the transformed HTML string with the necessary modifications.
 */
async function addNgcmAttribute(html) {
    const { rewriter, transformedContent } = await (0, html_rewriting_stream_1.htmlRewritingStream)(html);
    rewriter.on('startTag', (tag) => {
        if (tag.tagName === 'body' &&
            !tag.attrs.some((attr) => attr.name === CLIENT_RENDER_MODE_FLAG)) {
            tag.attrs.push({ name: CLIENT_RENDER_MODE_FLAG, value: '' });
        }
        rewriter.emitStartTag(tag);
    });
    return transformedContent();
}
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