d3-graphviz/src/keyMode.js

Graphviz DOT rendering and animated transitions for D3

export default function(keyMode) {

    if (!this._keyModes.has(keyMode)) {
        throw Error('Illegal keyMode: ' + keyMode);
    }
    if (keyMode != this._options.keyMode && this._data != null) {
        throw Error('Too late to change keyMode');
    }
    this._options.keyMode = keyMode;

    return this;
};