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You can use any encoding package available to the language you are using. For example, in javascript,

btoa()

can be used in your pulumi code.

but, I'm using typescript ant this dont work for me...

You could use

Buffer.from(enc, "base64").toString()

- again as @witty-candle-66007 mentioned you can use the language specific tools for this.

thanks!! This works for me!!