typeorm: Columns without specified types throws promise rejections for postgres

If I’m understanding correctly, I should be able to do something like this:

    @Column()
    text: string;

In a model definition and still have the type be infered by TypeORM (stop me dead in my tracks if I’m wrong). However, when I do this, I get the following errors from Node:

(node:540) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 1): DataTypeNotSupportedError: Data type "undefined" in "Post.text" is not supported by "postgres" database.