使用ionic2，Typescript，RollupJs，es2015模块的`lodash-es`导致TS错误

Question

I'm using lodash with the new ionic2@RC.0 project template, which includes

• Typescript
• Rollup
• es2015 modules

This works for me:

npm install lodash --save
npm install @types/lodash --save-dev --save-exact
// typescript
import _ from "lodash";

But apparently lodash-es is recommended with Rollup because of the tree-shaking thing. But when I do this:

npm install lodash-es --save  // instead of `lodash`
npm install @types/lodash --save-dev --save-exact
// typescript
import _ from "lodash-es";

I get a Typescript error

error TS2307: Cannot find module 'lodash-es'.

However, the transpiled javascript actually works and runs correctly. What gives?

here is my tsconfig

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

Answer 1

问题是没有人为lodash-es创建类型文件，因此Typescript编译器无法验证。