The "tsconfig.json" file must have compilerOptions.sourceMap set to true

　　在编译ionic项目的时候出现：Error：The "tsconfig.json" file must have compilerOptions.sourceMap set to true.

　　如下：

　　解决此问题首先我们要弄清楚这个文件的作用：tsconfig.json文件用来指定编译项目所需的根文件和编译器选项。

　　详细的编译选项参见：http://www.typescriptlang.org/docs/handbook/compiler-options.html

　　解决办法就是修改tsconfig.json:

{
  "compilerOptions": {
    "allowSyntheticDefaultImports": true,
    "declaration": true,
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "lib": [
      "dom",
      "es2015"
    ],
    "module": "es2015",
    "moduleResolution": "node",
    "target": "es5"
  },
  "exclude": [
    "node_modules"
  ],
  "compileOnSave": false,
  "atom": {
    "rewriteTsconfig": false
  }
}

{
  "compilerOptions": {
    "allowSyntheticDefaultImports": true,
    "declaration": false,
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "lib": [
      "dom",
      "es2015"
    ],
    "module": "es2015",
    "moduleResolution": "node",
    "sourceMap": true,
    "target": "es5"
  },
  "include": [
    "src/**/*.ts"
  ],
  "exclude": [
    "node_modules"
  ],
  "compileOnSave": false,
  "atom": {
    "rewriteTsconfig": false
  }
}