/**
 * Make projections defined in proj4 (with `proj4.defs()`) available in
 * OpenLayers. Requires proj4 >= 2.8.0.
 *
 * This function should be called whenever changes are made to the proj4
 * registry, e.g. after calling `proj4.defs()`. Existing transforms will not be
 * modified by this function.
 *
 * @param {?} proj4 Proj4.
 * @api
 */
export function register(proj4: unknown): void;
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