What does Isaiah 45:5 mean?

“I will go before you, and make the rough places smooth. I will break the doors of brass in pieces, and cut apart the bars of iron.

I will give you the treasures of darkness, and hidden riches of secret places, that you may know that it is I, Yahweh, who call you by your name, even the God of Israel.

For Jacob my servant’s sake, and Israel my chosen, I have called you by your name. I have given you a title, though you have not known me.

that they may know from the rising of the sun, and from the west, that there is no one besides me. I am Yahweh, and there is no one else.

I form the light, and create darkness. I make peace, and create calamity. I am Yahweh, who does all these things.

Rain, you heavens, from above, and let the skies pour down righteousness. Let the earth open, that it may produce salvation, and let it cause righteousness to spring up with it. I, Yahweh, have created it.