Typescript: Incorrect detection of sourceType (TSExportAssignment)

[armano2]

Bug Report

Current Behavior
Incorrect detection of sourceType in typescript

Input Code

• REPL or Repo link if applicable:

const foo = '';
export = foo;

Expected behavior/code
Resolved sourceType should be resolved to module..

Babel Configuration (.babelrc, package.json, cli command)

{
  sourceType: 'unambiguous',
  allowImportExportEverywhere: true,
  allowReturnOutsideFunction: true,
  ranges: true,
  plugins: [
    'jsx',
    'typescript',
    'objectRestSpread',
    'decorators-legacy',
    'classProperties',
    'asyncGenerators',
    'dynamicImport',
    'estree',
    'bigInt'
  ]
},

Environment

• Babel version(s): 7.2.2
• Node/npm version: 6-10
• OS: windows & linux
• Monorepo: no
• How you are using Babel: cli

Possible Solution

Add node of type TSExportAssignment to detection.

[babel-bot]

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so it's possible this won't be addressed swiftly.

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[nicolo-ribaudo]

I'm not sure about that. Arent export = and import foo = syntax sugar for commonjs?

[armano2]

https://www.typescriptlang.org/docs/handbook/modules.html#export--and-import--require

when used in typescript (tsc) its defining sourceType as module.

[liuxingbaoyu]

Fixed in #15497