slate-edit-code/tests/tab-start-offset/transform.js

A Slate plugin to handle keyboard events in code blocks.

module.exports = function(plugin, state) {
    let block = state.document.findDescendant(node => node.type == 'code_block');

    let withCursor = state.transform()
        .collapseToStartOf(block)
        .moveToOffsets(0)
        .apply();

    return plugin.onKeyDown(
        {
            preventDefault: function() {},
            stopPropagation: function() {}
        },
        { key: 'tab' },
        withCursor
    );
};