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t.tsTypeParameter should take 3 parameters but throws #10317

deificx opened this issue Aug 11, 2019 · 2 comments


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commented Aug 11, 2019

Bug Report

Current Behavior
calling t.tsTypeParameter with the name parameter yields Error: TSTypeParameter: Too many arguments passed. Received 3 but can receive no more than 2

Input Code

const generate = require("@babel/generator").default;
const t = require("@babel/types");

const ast = t.tsTypeParameter(

const { code } = generate(ast);

Expected behavior/code
should output foo extends bar = baz

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


  • Babel version(s): 7.4.4
  • Node/npm version: Node v10.12.0 / yarn 1.17.3
  • OS: Ubuntu 18.04

Possible Solution
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commented Aug 11, 2019

Hey @deificx! We really appreciate you taking the time to report an issue. The collaborators on this project attempt to help as many people as possible, but we're a limited number of volunteers, so it's possible this won't be addressed swiftly.

If you need any help, or just have general Babel or JavaScript questions, we have a vibrant Slack community that typically always has someone willing to help. You can sign-up here for an invite.


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commented Aug 11, 2019

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Agree, could you open a PR?

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