Function internalStringify

test/babel.js:50562–50642

(holder, key, isTopLevel)

	    // End

	    function internalStringify(holder, key, isTopLevel) {
	        var buffer, res;

	        // Replace the value, if necessary
	        var obj_part = getReplacedValueOrUndefined(holder, key, isTopLevel);

	        if (obj_part && !isDate(obj_part)) {
	            // unbox objects
	            // don't unbox dates, since will turn it into number
	            obj_part = obj_part.valueOf();
	        }
	        switch (typeof obj_part === "undefined" ? "undefined" : _typeof(obj_part)) {
	            case "boolean":
	                return obj_part.toString();

	            case "number":
	                if (isNaN(obj_part) || !isFinite(obj_part)) {
	                    return "null";
	                }
	                return obj_part.toString();

	            case "string":
	                return escapeString(obj_part.toString());

	            case "object":
	                if (obj_part === null) {
	                    return "null";
	                } else if (isArray(obj_part)) {
	                    checkForCircular(obj_part);
	                    buffer = "[";
	                    objStack.push(obj_part);

	                    for (var i = 0; i < obj_part.length; i++) {
	                        res = internalStringify(obj_part, i, false);
	                        buffer += makeIndent(indentStr, objStack.length);
	                        if (res === null || typeof res === "undefined") {
	                            buffer += "null";
	                        } else {
	                            buffer += res;
	                        }
	                        if (i < obj_part.length - 1) {
	                            buffer += ",";
	                        } else if (indentStr) {
	                            buffer += "\n";
	                        }
	                    }
	                    objStack.pop();
	                    if (obj_part.length) {
	                        buffer += makeIndent(indentStr, objStack.length, true);
	                    }
	                    buffer += "]";
	                } else {
	                    checkForCircular(obj_part);
	                    buffer = "{";
	                    var nonEmpty = false;
	                    objStack.push(obj_part);
	                    for (var prop in obj_part) {
	                        if (obj_part.hasOwnProperty(prop)) {