How to use the @actions/core.saveState function in @actions/core

core.setFailed(
                `Event Validation Error: The event type ${
                    process.env[Events.Key]
                } is not supported. Only ${utils
                    .getSupportedEvents()
                    .join(", ")} events are supported at this time.`
            );
        }

        let cachePath = utils.resolvePath(
            core.getInput(Inputs.Path, { required: true })
        );
        core.debug(`Cache Path: ${cachePath}`);

        const primaryKey = core.getInput(Inputs.Key, { required: true });
        core.saveState(State.CacheKey, primaryKey);

        const restoreKeys = core
            .getInput(Inputs.RestoreKeys)
            .split("\n")
            .filter(x => x !== "");
        const keys = [primaryKey, ...restoreKeys];

        core.debug("Resolved Keys:");
        core.debug(JSON.stringify(keys));

        if (keys.length > 10) {
            core.setFailed(
                `Key Validation Error: Keys are limited to a maximum of 10.`
            );
            return;
        }

export function setCacheState(state: ArtifactCacheEntry): void {
    core.saveState(State.CacheResult, JSON.stringify(state));
}