VLEX/BPM-UI/node_modules/ngx-bootstrap/utils/esm2015/theme-provider.js

/**
 * @fileoverview added by tsickle
 * @suppress {checkTypes,extraRequire,missingOverride,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
 */
import { window } from './facade/browser';
/** @type {?} */
let guessedVersion;
/**
 * @return {?}
 */
function _guessBsVersion() {
    if (typeof document === 'undefined') {
        return null;
    }
    /** @type {?} */
    const spanEl = document.createElement('span');
    spanEl.innerText = 'test bs version';
    document.body.appendChild(spanEl);
    spanEl.classList.add('d-none');
    /** @type {?} */
    const rect = spanEl.getBoundingClientRect();
    document.body.removeChild(spanEl);
    if (!rect) {
        return 'bs3';
    }
    return rect.top === 0 ? 'bs4' : 'bs3';
}
/**
 * @param {?} theme
 * @return {?}
 */
export function setTheme(theme) {
    guessedVersion = theme;
}
// todo: in ngx-bootstrap, bs4 will became a default one
/**
 * @return {?}
 */
export function isBs3() {
    if (typeof window === 'undefined') {
        return true;
    }
    if (typeof window.__theme === 'undefined') {
        if (guessedVersion) {
            return guessedVersion === 'bs3';
        }
        guessedVersion = _guessBsVersion();
        return guessedVersion === 'bs3';
    }
    return window.__theme !== 'bs4';
}
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