json - 如何将 JSON 文件导入 Angular 库？

Question

我在将 JSON 文件导入 Angular 7 库中的环境文件时遇到问题。我的 environment.ts 文件如下所示:

import firebase from './firebase.json';

export const environment = {
  production: false,
  firebase,
};

和firebase.json:

{
  "apiKey": "",
  "authDomain": "",
  "databaseURL": "",
  "projectId": "",
  "storageBucket": "",
  "messagingSenderId": ""
}

但不幸的是，当运行 ng build 时它失败了:

> sdk@0.0.0 build <path-to-project>/sdk
> ng build sdk

Building Angular Package
Building entry point 'sdk'
Compiling TypeScript sources through ngc
Bundling to FESM2015

BUILD ERROR
Unexpected token / in JSON at position 0
SyntaxError: Unexpected token / in JSON at position 0
    at JSON.parse (<anonymous>)
    at Object.transform (<path-to-project>/sdk/node_modules/rollup-plugin-json/dist/rollup-plugin-json.cjs.js:18:20)
    at <path-to-project>/sdk/node_modules/rollup/dist/rollup.js:20962:25

Unexpected token / in JSON at position 0
SyntaxError: Unexpected token / in JSON at position 0
    at JSON.parse (<anonymous>)
    at Object.transform (<path-to-project>/sdk/node_modules/rollup-plugin-json/dist/rollup-plugin-json.cjs.js:18:20)
    at <path-to-project>/sdk/node_modules/rollup/dist/rollup.js:20962:25
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! sdk@0.0.0 build: `ng build sdk`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the sdk@0.0.0 build script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     xxx/.npm/_logs/2019-04-10T13_40_47_486Z-debug.log

我已经试过了:

1) 添加到 tsconfig.json

"esModuleInterop": true,
"allowSyntheticDefaultImports": true,
"noImplicitAny": false,

2) 添加 typings.d.ts 和

declare module '*.json' {
  const value: any;
  export default value;
}

3) 将 import 更改为 require

但到目前为止还没有运气。

我的 devDependencies 包括:

"@angular-devkit/build-ng-packagr": "^0.13.8",
"@angular/cli": "~7.3.6",
"@angular/common": "~7.2.0",
"@angular/compiler": "^7.2.12",
"@angular/compiler-cli": "^7.2.12",
...

Answer 1

在经历了很多痛苦之后，我们找到了解决方案 here .

这基本上是您在第一次尝试时所做的，但是您需要再添加一个选项。

"resolveJsonModule": true,  
"esModuleInterop": true,
"allowSyntheticDefaultImports": true

另外:

"annotateForClosureCompiler": false

注意:对于最后一个 Prop ，这是同一个文件，但不是将其添加到 compilerOptions，而是将其添加到 angularCompilerOptions