src/vs/workbench/contrib/terminal/common/terminal.ts/TerminalBackendRegistry/registerTerminalBackend
class TerminalBackendRegistry:	registerTerminalBackend(backend: ITerminalBackend): void {
		const key = this._sanitizeRemoteAuthority(backend.remoteAuthority);
		if (this._backends.has(key)) {
			throw new Error(`A terminal backend with remote authority '${key}' was already registered.`);
		}
		this._backends.set(key, backend);
	}