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JVM AOT compiler currently generating JavaScript, C++, Haxe, with initial focus on Kotlin and games.
There is a newer version: 0.6.8
package com.jtransc.text;

import com.jtransc.annotation.JTranscMethodBody;
import com.jtransc.annotation.JTranscMethodBodyList;
import com.jtransc.annotation.haxe.HaxeMethodBody;

@SuppressWarnings("IndexOfReplaceableByContains")
public class JTranscStringTools {
	//@JTranscMethodBody(target = "js", value = "return N.str('' + p0);")
	public static String toString(float v) {
		//return RealToString.getInstance().floatToString(v);
		String out = toString((double) v);
		int index = out.indexOf('.');
		if (index >= 0) {
			return out.substring(0, Math.min(out.length(), index + 6));
		} else {
			return out;
		}
		//return _toString(v);
	}

	//@JTranscMethodBody(target = "js", value = "return N.str('' + p0);")
	//public static String toString(float v) {
	//	//return JTranscStringTools.toString(d);
	//	String out = _toString(v);
	//	boolean hasSymbols = false;
	//	for (int n = 0; n < out.length(); n++) {
	//		char c = out.charAt(n);
	//		if (!Character.isDigit(c) && c != '-') {
	//			hasSymbols = true;
	//			break;
	//		}
	//	}
	//	if (out.indexOf("e+") >= 0) out = out.replace("e+", "E");
	//	if (out.indexOf("e-") >= 0) out = out.replace("e-", "E-");
	//	return hasSymbols ? out : (out + ".0");
	//}

	//@JTranscMethodBody(target = "js", value = "return N.str('' + p0);")
	public static String toString(double v) {
		if (Double.isNaN(v)) return "NaN";
		if (Double.isInfinite(v)) return (v < 0) ? "-Infinity" : "Infinity";
		if (v == 0.0) {
			long l = Double.doubleToRawLongBits(v);
			if ((l >>> 63) != 0) return "-0.0";
		}
		//return JTranscStringTools.toString(d);
		String out = _toString(v);
		boolean hasSymbols = false;
		for (int n = 0; n < out.length(); n++) {
			char c = out.charAt(n);
			if (!Character.isDigit(c) && c != '-') {
				hasSymbols = true;
				break;
			}
		}
		if (out.indexOf("e+") >= 0) out = out.replace("e+", "E");
		if (out.indexOf("e-") >= 0) out = out.replace("e-", "E-");
		return hasSymbols ? out : (out + ".0");
	}

	//@JTranscMethodBody(target = "js", value = "return N.str(String(N.isNegativeZero(+p0) ? '-0' : +Math.fround(p0)));")
	//@JTranscMethodBody(target = "cpp", value = "wchar_t temp[128] = {0}; swprintf(temp, sizeof(temp), L\"%f\", (float)p0); return N::str(std::wstring(temp));")
	////@JTranscMethodBody(target = "js", value = "return N.str(String(Number(p0)));")
	////@JTranscMethodBody(target = "js", value = "return N.str(Number(p0).toPrecision(2));")
	//native static public String _toString(float v);

	@HaxeMethodBody("return N.str(N.isNegativeZero(p0) ? '-0' : '$p0');")
	@JTranscMethodBodyList({
		@JTranscMethodBody(target = "php", value = "return N::str(\"$p0\");"),
		@JTranscMethodBody(target = "js", value = "return N.str(String(N.isNegativeZero(+p0) ? '-0' : +p0));"),
		@JTranscMethodBody(target = "cpp", value = "wchar_t temp[32] = {0}; swprintf(temp, sizeof(temp), L\"%.16g\", p0); return N::str(temp);"),
		@JTranscMethodBody(target = "d", value = "return N.str(format(\"%.16g\", p0));"),
		@JTranscMethodBody(target = "cs", value = "return N.str(Convert.ToString(p0, System.Globalization.CultureInfo.InvariantCulture));"),
		@JTranscMethodBody(target = "as3", value = "return N.str('' + p0);"),
		@JTranscMethodBody(target = "dart", value = "return N.str(p0.toString());"),
	})
	native static public String _toString(double v);
}