in src/construct.ts [416:434]
private addChild(child: Construct, childName: string) {
if (this.locked) {
// special error if root is locked
if (!this.path) {
throw new Error('Cannot add children during synthesis');
}
throw new Error(`Cannot add children to "${this.path}" during synthesis`);
}
if (this._children[childName]) {
const name = this.id ?? '';
const typeName = this.host.constructor.name;
throw new Error(`There is already a Construct with name '${childName}' in ${typeName}${name.length > 0 ? ' [' + name + ']' : ''}`);
}
this._children[childName] = child;
}