js convert string to boolean

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function parseBoolean(value) {
    switch(value) {
        case 1:
        case true:
        case "1":
        case "true":
        case "True":
        case "TRUE":
        case "on":
        case "On":
        case "ON":
        case "yes":
        case "Yes":
       	case "YES":
        case "t":
        case "T":
        case "y":
        case "Y":
            return true;
        
		case 0:
        case false:
        case "0":
        case "false":
        case "False":
        case "FALSE":
        case "off":
        case "Off":
        case "OFF":
        case "no":
        case "No":
        case "NO":
        case "f":
        case "F":
        case "n":
        case "N":
            return false;
        
        default: 
            throw new Error('Incorrect value!');
    }
}

var text = 'true';
var value = parseBoolean(text);

console.log(value);  // true