为什么typescript引用 material-ui就报错

让我们从下面的例子开始，这个例子将会贯穿本文。首先我们写了一段字符串验证代码，用来验证用户在web页面表单输入的信息，或者是检查外部文件提供的数据格式。
在单个文件中的Validator
interface StringValidator {
isAcceptable(s: string): boolean;
}

var lettersRegexp = /^[A-Za-z]+$/;
var numberRegexp = /^[0-9]+$/;

class LettersOnlyValidator implements StringValidator {
isAcceptable(s: string) {
return lettersRegexp.test(s);
}
}

class ZipCodeValidator implements StringValidator {
isAcceptable(s: string) {
return s.length === 5 && numberRegexp.test(s);
}
}

// Some samples to try
var strings = ['Hello', '98052', '101'];

// Validators to use
var validators: { [s: string]: StringValidator; } = {};
validators['ZIP code'] = new ZipCodeValidator();
validators['Letters only'] = new LettersOnlyValidator();

// Show whether each string passed each validator
strings.forEach(s => {
for (var name in validators) {
console.log('"' + s + '" ' + (validators[name].isAcceptable(s) ? ' matches ' : ' does not match ') + name);
}