/**
 * grapheme-cluster + display-width helpers. layoutText needs these so wrapping and hard-breaking
 * never split a surrogate pair or an emoji ZWJ sequence in half, and so CJK/emoji text is measured
 * at its real on-screen width instead of the latin-average estimate.
 */
/** split text into user-perceived characters — never breaks a surrogate pair or a ZWJ sequence. */
export declare function graphemes(text: string): string[];
/** width of one grapheme cluster in "latin-char" units (1 = the base char cell, 2 = wide/emoji). */
export declare function clusterWidth(cluster: string): number;
/** total width of a string in "latin-char" units — sums per-grapheme, not per-code-unit. */
export declare function textWidthUnits(text: string): number;
/** first grapheme of `name`, upper-cased if it's a letter — safe avatar/contact initial. */
export declare function initialOf(name: string): string;
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