All files / roosterjs-content-model-plugins/lib/edit/utils preserveParagraphFormat.ts

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import type { ShallowMutableContentModelParagraph } from 'roosterjs-content-model-types';
 
/**
 * @internal
 * Preserve specific paragraph format properties from source paragraph to target paragraph
 * @param formatsToPreserveOnMerge Array of format property names to preserve
 * @param paragraph Source paragraph to copy format from
 * @param newParagraph Target paragraph to copy format to
 */
export function preserveParagraphFormat(
    formatsToPreserveOnMerge: string[] | undefined,
    paragraph: ShallowMutableContentModelParagraph,
    newParagraph: ShallowMutableContentModelParagraph
) {
    if (formatsToPreserveOnMerge && formatsToPreserveOnMerge.length) {
        const format = paragraph.format as { [key: string]: string };
        const newFormat = newParagraph.format as { [key: string]: string };
        formatsToPreserveOnMerge.forEach(key => {
            const formatValue = format[key];
 
            if (formatValue !== undefined) {
                newFormat[key] = formatValue;
            }
        });
    }
}