SyntaxError: Missing initializer in const declaration (nodejs+typescript+babel)

Bug Report

Current Behavior

I am trying to use babel with typescript in nodejs environment with .js files.

I was following https://babeljs.io/docs/en/babel-preset-typescript

I am getting the following SyntaxError :

SyntaxError: Missing initializer in const declaration at createScript (vm.js:80:10) at Object.runInThisContext (vm.js:139:10) at Module._compile (module.js:617:28) at Object.Module._extensions…js (module.js:664:10) at Module.load (module.js:566:32) at tryModuleLoad (module.js:506:12) at Function.Module._load (module.js:498:3) at Function.Module.runMain (module.js:694:10) at startup (bootstrap_node.js:204:16) at bootstrap_node.js:625:3

Input Code

require("@babel/core").transform("code", {
  presets: ["@babel/preset-typescript"],
});

const x: number = 0;
console.log(x);

Expected behavior/code

The code should be compiled by babel.

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

require("@babel/core").transform("code", {
  presets: ["@babel/preset-typescript"],
});

Environment

• Babel version(s): 7
• Node/npm version: 8.15.0
• OS: Windows 7
• Monorepo: lerna
• How you are using Babel: register

[nicolo-ribaudo]

It should be server.ts: the TypeScript preset only runs on typescript files. If you want to call it .js you need to use @babel/plugin-transform-typescript instead.

[jony89]

same issue with changing the files to .ts.

const x: number = 0; ^

SyntaxError: Missing initializer in const declaration at createScript (vm.js:80:10) at Object.runInThisContext (vm.js:139:10) at Module._compile (module.js:617:28) at Module._extensions…js (module.js:664:10) at Object.newLoader [as .js] (…\node_modules\pirates\lib\index.js:104:7) at Module.load (module.js:566:32) at tryModuleLoad (module.js:506:12) at Function.Module._load (module.js:498:3) at Module.require (module.js:597:17) at require (internal/module.js:11:18)

but using @babel/plugin-transform-typescript with .js files actually works.

Thanks A lot !