getUsageKey(runtime) {
		const key = [];
		if (this._redirectTo !== undefined) {
			key.push(this._redirectTo.getUsageKey(runtime));
		} else {
			key.push(this._otherExportsInfo.getUsed(runtime));
		}
		key.push(this._sideEffectsOnlyInfo.getUsed(runtime));
		for (const exportInfo of this.orderedOwnedExports) {
			key.push(exportInfo.getUsed(runtime));
		}
		return key.join("|");
	}
@param {RuntimeSpec} runtime runtime
@returns {string} key representing the usage