A string that should be inserted into a document when selecting this completion. When `falsy` the label is used as the insert text for this item.
The `insertText` is subject to interpretation by the client side. Some tools might not take the string literally. For example VS Code when code complete is requested in this example `con<cursor position>` and a completion item with an `insertText` of `console` is provided it will only insert `sole`. Therefore it is recommended to use `textEdit` instead since it avoids additional client side interpretation.