ts-r
  • Error
  • Reported by the lexer and parser

TS8003

'export =' can only be used in TypeScript files.

`export =` appears in a JavaScript file. Use `module.exports =` or an ES `export` instead.

What it means

export = value is TypeScript's syntax for a CommonJS-style export and can't appear in a .js file.

ts-r's parser reports this code when it reads .js files with tsc's rules for TypeScript syntax in JavaScript. ts-r-check doesn't report it yet: today it parses .js files with the plain JavaScript grammar and reports a syntax error at the same place instead.

Example

index.js
const config = { port: 3000 };
export = config;
cargo run -p ts_r_parser --example dump -- index.js --ts-in-js report ts-r output
index.js(2,1): error TS8003: 'export =' can only be used in TypeScript files.

Recorded by node scripts/verify-examples.mjs with ts-r built from commit 6deaf01. The example uses the default tsconfig: strict, target: es2022, module: esnext, moduleResolution: bundler.

How to fix

  • Write module.exports = config; in CommonJS, or export default config; in an ES module.
  • Rename the file to .ts if it's meant to be TypeScript.