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Provide API method to transform a source code string #20

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mtsknn opened this issue Jun 24, 2021 · 3 comments
Open

Provide API method to transform a source code string #20

mtsknn opened this issue Jun 24, 2021 · 3 comments

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@mtsknn
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mtsknn commented Jun 24, 2021

The currently provided transform method takes a path to a file (or an array of paths) and optionally writes the transformed file(s) to the file system.

It would be nice to provide another method which takes a source code string and returns a transformed source code string. For example:

import {transform} from 'cjstoesm'

const input = `
  const {foo: bar} = require("./my-module")
  module.exports = {baz: 3}
`

await transform({ input })
//=> 'import {foo as bar} from "./my-module.js"\nexport const baz = 3'

(The method name could be different.)
@caoxiemeihao
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It's very useful！ 👏👏👏👏

@caoxiemeihao
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Maybe you can use it like this

import { transpileModule, ModuleKind } from 'typescript'
import { cjsToEsm } from 'cjstoesm'

const input = `
  const {foo: bar} = require("./my-module")
  module.exports = {baz: 3}
`

const result = transpileModule(input, {
  transformers: cjsToEsm(),
  compilerOptions: {
    module: ModuleKind.ES2020,
  },
})

// console.log(result.outputText)

@ghh-l-djl
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I have the same needs

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@mtsknn @caoxiemeihao @ghh-l-djl