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nicolo-ribaudo merged 1 commit into from
May 12, 2026
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docs(v8-migration): note 0-based codeFrameColumns column #3200

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13 changes: 13 additions & 0 deletions docs/v8-migration-api.md
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Expand Up @@ -1445,6 +1445,19 @@ Other than the changes listed below, `@babel/parser` is affected by all the [AST

### `@babel/code-frame`

![medium](https://img.shields.io/badge/risk%20of%20breakage%3F-medium-yellow.svg)

- Use 0-based `column` in `codeFrameColumns` ([#17849](https://github.com/babel/babel/pull/17849))

Babel 7 interpreted `column` as 1-based. Babel 8 treats it as 0-based, matching `@babel/parser` AST locations.

__Migration__: If you were adding `+ 1` to an AST `loc.column` before passing it to `codeFrameColumns`, drop that. If you were passing a 1-based column directly, subtract 1 before calling `codeFrameColumns`.

```diff title="my-babel-plugin.js"
- codeFrameColumns(code, { start: { line: loc.line, column: loc.column + 1 } });
+ codeFrameColumns(code, { start: { line: loc.line, column: loc.column } });
```

![low](https://img.shields.io/badge/risk%20of%20breakage%3F-low-yellowgreen.svg)

- Remove default export ([#17772](https://github.com/babel/babel/pull/17772))
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