preload-next/dist/link-preload.js

A Preload Link Component for Next.js to handle seamless page transitions

"use strict";
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var __importDefault = (this && this.__importDefault) || function (mod) {
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};
Object.defineProperty(exports, "__esModule", { value: true });
exports.LinkPreload = void 0;
var jsx_runtime_1 = require("react/jsx-runtime");
var resolve_href_1 = require("next/dist/shared/lib/router/utils/resolve-href");
var add_locale_1 = require("next/dist/shared/lib/router/utils/add-locale");
var is_local_url_1 = require("next/dist/shared/lib/router/utils/is-local-url");
var router_1 = require("next/router");
var use_intersection_1 = require("next/dist/client/use-intersection");
var router_2 = __importDefault(require("next/router"));
var react_1 = __importDefault(require("react"));
var utils_1 = require("./utils");
var react_2 = require("react");
var link_clicked_1 = require("./link-clicked");
var prefetch_1 = require("./prefetch");
var context_1 = require("./context");
var prefetched = {};
var LinkPreload = function (props) {
    var p = props.prefetch !== false;
    var router = (0, router_1.useRouter)();
    var _a = react_1.default.useMemo(function () {
        var _a = (0, resolve_href_1.resolveHref)(router, props.href, true), resolvedHref = _a[0], resolvedAs = _a[1];
        return {
            href: resolvedHref,
            as: props.as ? (0, resolve_href_1.resolveHref)(router, props.as) : resolvedAs || resolvedHref,
        };
    }, [router, props.href, props.as]), href = _a.href, as = _a.as;
    var children = props.children, replace = props.replace, shallow = props.shallow, scroll = props.scroll, locale = props.locale;
    if (typeof children === "string") {
        children = (0, jsx_runtime_1.jsx)("a", { children: children });
    }
    var child;
    if (process.env.NODE_ENV === "development") {
        try {
            child = react_1.default.Children.only(children);
        }
        catch (err) {
            throw new Error(
            // eslint-disable-next-line @typescript-eslint/restrict-template-expressions
            "Multiple children were passed to <Link> with `href` of `".concat(props.href, "` but only one child is supported https://nextjs.org/docs/messages/link-multiple-children") +
                (typeof window !== "undefined"
                    ? " \nOpen your browser's console to view the Component stack trace."
                    : ""));
        }
    }
    else {
        child = react_1.default.Children.only(children);
    }
    var childRef = child && typeof child === "object" && child.ref;
    var _b = (0, use_intersection_1.useIntersection)({
        rootMargin: "200px",
    }), setIntersectionRef = _b[0], isVisible = _b[1];
    var setRef = react_1.default.useCallback(function (el) {
        setIntersectionRef(el);
        if (childRef) {
            if (typeof childRef === "function")
                childRef(el);
            else if (typeof childRef === "object") {
                childRef.current = el;
            }
        }
    }, [childRef, setIntersectionRef]);
    var preloadContext = (0, react_2.useContext)(context_1.PreloadContext);
    react_1.default.useEffect(function () {
        (function () { return __awaiter(void 0, void 0, void 0, function () {
            var shouldPrefetch, curLocale, isPrefetched;
            return __generator(this, function (_a) {
                switch (_a.label) {
                    case 0:
                        shouldPrefetch = isVisible && p && (0, is_local_url_1.isLocalURL)(href);
                        curLocale = typeof locale !== "undefined" ? locale : router && router.locale;
                        isPrefetched = prefetched[href + "%" + as + (curLocale ? "%" + curLocale : "")];
                        if (!(shouldPrefetch && !isPrefetched)) return [3 /*break*/, 2];
                        return [4 /*yield*/, (0, prefetch_1.prefetch)(router, href, as, preloadContext, router_2.default, prefetched, {
                                locale: curLocale,
                            })];
                    case 1:
                        _a.sent();
                        _a.label = 2;
                    case 2: return [2 /*return*/];
                }
            });
        }); })();
    }, [as, href, isVisible, locale, p, router]);
    var childProps = {
        ref: setRef,
        onClick: function (e) {
            if (child.props && typeof child.props.onClick === "function") {
                child.props.onClick(e);
            }
            if (!e.defaultPrevented) {
                (0, link_clicked_1.linkClicked)(e, router, href, as, replace, shallow, scroll, locale);
            }
        },
        href: props.href,
    };
    childProps.onMouseEnter = function (e) { return __awaiter(void 0, void 0, void 0, function () {
        return __generator(this, function (_a) {
            switch (_a.label) {
                case 0:
                    if (child.props && typeof child.props.onMouseEnter === "function") {
                        child.props.onMouseEnter(e);
                    }
                    if (!(0, is_local_url_1.isLocalURL)(href)) return [3 /*break*/, 2];
                    return [4 /*yield*/, (0, prefetch_1.prefetch)(router, href, as, preloadContext, router_2.default, {
                            priority: true,
                        })];
                case 1:
                    _a.sent();
                    _a.label = 2;
                case 2: return [2 /*return*/];
            }
        });
    }); };
    if (props.passHref || (child.type === "a" && !("href" in child.props))) {
        var curLocale = typeof locale !== "undefined" ? locale : router && router.locale;
        var localeDomain = router &&
            router.isLocaleDomain &&
            (0, utils_1.getDomainLocale)(as, curLocale, router && router.locales, router && router.domainLocales);
        childProps.className = props.className;
        childProps.href =
            localeDomain || (0, add_locale_1.addLocale)(as, curLocale, router && router.defaultLocale);
    }
    return react_1.default.cloneElement(child, childProps);
};
exports.LinkPreload = LinkPreload;