Easily add import and require statements with jscodeshift. If something is already imported, returns the locally bound identifier, and avoids name conflicts.

npm install --save jscodeshift-add-imports

const j = require('jscodeshift')
const addImports = require('jscodeshift-add-imports')

const { statement } = j.template

const code = `
// @flow
import {foo, type bar} from 'foo'
import baz from 'baz'
`

const root = j(code)
const result = addImports(root, [
  statement`import type {bar, baz} from 'foo'`,
  statement`import blah, {type qux} from 'qux'`,
])
console.log(result)
console.log(root.toSource())

Output code:

// @flow
import { foo, type bar } from 'foo'
import baz from 'baz'
import type { baz as baz1 } from 'foo'
import blah, { type qux } from 'qux'

Return value:

{
  bar: 'bar',
  baz: 'baz1',
  blah: 'blah',
  qux: 'qux',
}

Currently tested on [email protected] with the following parsers:

• babylon
• ts

There are currently issues with the babel and flow parsers.

It won't likely work with other custom parsers unless they output nodes in the same format as Babel for import declarations, variable declarations, require calls, and object patterns.

The jscodeshift-wrapped AST of your source code

The AST of an import declaration or variable declaration with requires to add, or an array of them.

An object where the key is the local identifier you requested in statements, and the value is the resulting local identifier used in the modified code (which could be the existing local identifier already imported in the code or the local identifier chosen to avoid name conflicts with an existing binding)