Can you tell me the data type of a Babel plugin parameter specified in TypeScript?

Struggling to find ample examples or documentation on writing a Babel plugin in TypeScript. Currently, I am working on a visitor plugin with the following signature:

export default function myPlugin({ types: t }: typeof babel): PluginObj {

In order to obtain certain types, I am using:

import type { PluginObj, PluginPass } from '@babel/core';

The aspect that is causing me confusion is the { types: t }: typeof babel derived from 

import type * as babel from '@babel/core';

While this syntax has been used in some online examples, I am unsure if it is the correct way to type it. Any guidance would be appreciated.

typescriptbabeljstypescript-typingsbabel-plugin

Answer №1

According to a discussion in an open Babel thread dated back to 2019, it appears that Babel's types are split between '@babel/core' and @babel/types. It's important to note that unlike some other "types" packages for Node, @babel/types serves as more than just a "type" package for Babel; rather, it includes methods for manually constructing ASTs and validating the types of AST nodes. Therefore, these are essentially distinct packages with distinct objectives.

The issue faced with Babel packages is that they utilize wildcard imports, leading to a lack of explicit typing for the packages themselves.

One potential quick fix:

import type * as BabelCoreNamespace from '@babel/core';
import type * as BabelTypesNamespace from '@babel/types';
import type { PluginObj } from '@babel/core';

export type Babel = typeof BabelCoreNamespace;
export type BabelTypes = typeof BabelTypesNamespace;

export default function myPlugin(babel: Babel): PluginObj {
    // Insert plugin logic here
}

This adjustment aims to enhance code clarity until the aforementioned open Babel issue gets resolved.

Answer №2

What do you think of this code?

import * as Babel from '@babel/core';

export default function customPlugin(babel) {
  // const t = babel.types;
  // const expression: Babel.Node = t.binaryExpression(...)
}

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