/**
 * Forms a new strings which inserts given `insert` string into `src`
 * string at `from` position and appends remaining `src` chars from
 * original `to` position. If `from` and `to` are equal (`to` by default
 * is), the operation is a pure insertion. If not, then some chars from
 * `src` will be removed in the new string. If either position is
 * negative, it'll be considered relative to the end of the `src`.
 *
 * @param src -
 * @param insert -
 * @param from -
 * @param to -
 */
export declare const splice: (src: string, insert: string, from: number, to?: number) => string;
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