TS Error with `lodash-es` using ionic2, Typescript, RollupJs, es2015 modules

Question

I'm using lodash with the new [email protected] 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
  }
}

icfantv · Accepted Answer · 2016-09-30 21:15:27Z

2

The problem is that no one has created a typings file for lodash-es so the Typescript compiler can't validate.

answered Sep 30, 2016 at 21:15

icfantv

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3 Comments

icfantv Over a year ago

We've made the typescript team aware, but frankly, it's really up to the community.

E Sturzenegger Over a year ago

@icfantv can you link up here the issue where your entry is concerning this

icfantv Over a year ago

@ESturzenegger, this was at an on-site meeting with a couple of members of the MSFT TS team. they took notes, but this isn't a TS issue, per se, rather a lodash and lodash community one: github.com/lodash/lodash/issues/1835.

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