1 | /**
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2 | * @license
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3 | * Copyright Google LLC All Rights Reserved.
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4 | *
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5 | * Use of this source code is governed by an MIT-style license that can be
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6 | * found in the LICENSE file at https://angular.io/license
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7 | */
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8 | import * as html from './ast';
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9 | import { ParseTreeResult } from './parser';
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10 | export declare const PRESERVE_WS_ATTR_NAME = "ngPreserveWhitespaces";
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11 | /**
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12 | * Angular Dart introduced &ngsp; as a placeholder for non-removable space, see:
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13 | * https://github.com/dart-lang/angular/blob/0bb611387d29d65b5af7f9d2515ab571fd3fbee4/_tests/test/compiler/preserve_whitespace_test.dart#L25-L32
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14 | * In Angular Dart &ngsp; is converted to the 0xE500 PUA (Private Use Areas) unicode character
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15 | * and later on replaced by a space. We are re-implementing the same idea here.
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16 | */
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17 | export declare function replaceNgsp(value: string): string;
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18 | /**
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19 | * This visitor can walk HTML parse tree and remove / trim text nodes using the following rules:
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20 | * - consider spaces, tabs and new lines as whitespace characters;
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21 | * - drop text nodes consisting of whitespace characters only;
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22 | * - for all other text nodes replace consecutive whitespace characters with one space;
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23 | * - convert &ngsp; pseudo-entity to a single space;
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24 | *
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25 | * Removal and trimming of whitespaces have positive performance impact (less code to generate
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26 | * while compiling templates, faster view creation). At the same time it can be "destructive"
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27 | * in some cases (whitespaces can influence layout). Because of the potential of breaking layout
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28 | * this visitor is not activated by default in Angular 5 and people need to explicitly opt-in for
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29 | * whitespace removal. The default option for whitespace removal will be revisited in Angular 6
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30 | * and might be changed to "on" by default.
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31 | */
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32 | export declare class WhitespaceVisitor implements html.Visitor {
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33 | visitElement(element: html.Element, context: any): any;
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34 | visitAttribute(attribute: html.Attribute, context: any): any;
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35 | visitText(text: html.Text, context: SiblingVisitorContext | null): any;
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36 | visitComment(comment: html.Comment, context: any): any;
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37 | visitExpansion(expansion: html.Expansion, context: any): any;
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38 | visitExpansionCase(expansionCase: html.ExpansionCase, context: any): any;
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39 | }
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40 | export declare function removeWhitespaces(htmlAstWithErrors: ParseTreeResult): ParseTreeResult;
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41 | interface SiblingVisitorContext {
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42 | prev: html.Node | undefined;
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43 | next: html.Node | undefined;
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44 | }
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45 | export {};
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