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With inspiration from other libraries

There is a newer version: 2.12.15

package io.virtdata.libbasics.shared.unary_string;

import io.virtdata.annotations.Categories;
import io.virtdata.annotations.Category;
import io.virtdata.annotations.Example;
import io.virtdata.annotations.ThreadSafeMapper;

import java.nio.ByteBuffer;
import java.nio.charset.StandardCharsets;
import java.util.Base64;
import java.util.function.Function;

@Categories(Category.conversion)
@ThreadSafeMapper
public class ToBase64String implements Function {

    private final static ThreadLocal tl_state = ThreadLocal.withInitial(TLState::new);

    @Example({"ToBase64String()","encode any input as Base64"})
    public ToBase64String() {
    }

    @Override
    public String apply(String value) {
        TLState state = tl_state.get();
        ByteBuffer sb = ByteBuffer.wrap(value.getBytes(StandardCharsets.UTF_8));
        return state.encoder.encodeToString(sb.array());
    }

    private static class TLState {
        public Base64.Encoder encoder = Base64.getEncoder();
    }
}