ts-invariant

TypeScript implementation of
invariant(condition, message).

Supports invariant.log, invariant.warn, and invariant.error, which
wrap console methods of the same name, and may be stripped in production
by rollup-plugin-invariant.

The verbosity of these methods can be globally reconfigured using the
setVerbosity function:

 import { setVerbosity } from "ts-invariant";

setVerbosity("log"); // display all messages (default)
setVerbosity("warn"); // display only warnings and errors
setVerbosity("error"); // display only errors
setVerbosity("silent"); // display no messages