fangliao-houtai/node_modules/snabbdom/build/helpers/attachto.js

function pre(vnode, newVnode) {
    const attachData = vnode.data.attachData;
    // Copy created placeholder and real element from old vnode
    newVnode.data.attachData.placeholder = attachData.placeholder;
    newVnode.data.attachData.real = attachData.real;
    // Mount real element in vnode so the patch process operates on it
    vnode.elm = vnode.data.attachData.real;
}
function post(_, vnode) {
    // Mount dummy placeholder in vnode so potential reorders use it
    vnode.elm = vnode.data.attachData.placeholder;
}
function destroy(vnode) {
    // Remove placeholder
    if (vnode.elm !== undefined) {
        vnode.elm.parentNode.removeChild(vnode.elm);
    }
    // Remove real element from where it was inserted
    vnode.elm = vnode.data.attachData.real;
}
function create(_, vnode) {
    const real = vnode.elm;
    const attachData = vnode.data.attachData;
    const placeholder = document.createElement("span");
    // Replace actual element with dummy placeholder
    // Snabbdom will then insert placeholder instead
    vnode.elm = placeholder;
    attachData.target.appendChild(real);
    attachData.real = real;
    attachData.placeholder = placeholder;
}
export function attachTo(target, vnode) {
    if (vnode.data === undefined)
        vnode.data = {};
    if (vnode.data.hook === undefined)
        vnode.data.hook = {};
    const data = vnode.data;
    const hook = vnode.data.hook;
    data.attachData = { target: target, placeholder: undefined, real: undefined };
    hook.create = create;
    hook.prepatch = pre;
    hook.postpatch = post;
    hook.destroy = destroy;
    return vnode;
}
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