@babel/code-frame

import { codeFrameColumns } from "@babel/code-frame";
const rawLines = `class Foo {
  constructor()
}`;
const location = { start: { line: 2, column: 16 } };
const result = codeFrameColumns(rawLines, location, {
  /* options */
console.log(result);

You can also pass an end hash in location.

import { codeFrameColumns } from "@babel/code-frame";
const rawLines = `class Foo {
  constructor() {
  }
}`;
const location = {
  start: { line: 2, column: 17 },
  end: { line: 4, column: 3 },
};
const result = codeFrameColumns(rawLines, location, {
  /* options */
});

boolean, defaults to false.

Toggles syntax highlighting the code as JavaScript for terminals.

number, defaults to 2.

number, defaults to 3.

Adjust the number of lines to show below the error.

, defaults to false.

Enable this to forcibly syntax highlight the code as JavaScript (for non-terminals); overrides highlightCode.

Pass in a string to be displayed inline (if possible) next to the highlighted location in the code. If it can’t be positioned inline, it will be placed above the code frame.

1 | class Foo {
> 2 |   constructor()
  |                ^ Missing {
3 | };

Prior to version 7, the only API exposed by this module was for a single line and optional column pointer. The old API will now log a deprecation warning.

The new API takes a location object, similar to what is available in an AST.

This is an example of the deprecated (but still available) API:

import { codeFrameColumns } from "@babel/code-frame";
const rawLines = `class Foo {
  constructor() {
    console.log("hello");
  }
}`;
const location = { start: { line: 2, column: 16 } };
const result = codeFrameColumns(rawLines, location, {
  /* options */
});