update docs for bugfixes removal #3129
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JLHwung
commented
Sep 11, 2025
| - `include` and `exclude` respect renamed package names ([#15576](https://github.com/babel/babel/pull/15576)) | ||
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| **Migration**: If `includes` or `excludes` contain any plugins mentioned in the [Packages Renames section](./v8-migration.md#renamed-packages), change it to the new name. For example, | ||
| **Migration**: If `include` or `exclude` contain any plugins mentioned in the [Packages Renames section](./v8-migration.md#renamed-packages), change it to the new name. For example, |
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Previously I made typos in the include and exclude options, they have also been fixed in this PR.
| **Migration**: You will probably be fine with the new behaviour as Babel now tries to compile the broken syntax to the closest _non-broken modern syntax_ supported by your target browsers. | ||
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| - Removed syntax plugins can not be used in `includes` and `excludes` ([#15810](https://github.com/babel/babel/pull/15810)) | ||
| If anyhow you want to restore the Babel 7 behaviour for debug purpose, you can specify the [`exclude` option](./preset-env.md#exclude): `{ exclude: [/bugfix/] }` to explicitly exclude the bugfixes plugins. Note that doing so will bloat the output as Babel has to compile features to older targets. |
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Will disabling the bugfix cause the output to become larger?
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Yes, for example, given the input
var a;
a?.bwith target chrome: 90,
the output with { bugfixes: true } is
var a;
a?.b;whereas the output with { bugfixes: false } is
var a;
a === null || a === void 0 ? void 0 : a.b;
1 task
liuxingbaoyu
approved these changes
Sep 22, 2025
JLHwung
commented
Sep 23, 2025
| **Migration**: You will probably be fine with the new behaviour as Babel now tries to compile the broken syntax to the closest _non-broken modern syntax_ supported by your target browsers. | ||
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| - Removed syntax plugins can not be used in `includes` and `excludes` ([#15810](https://github.com/babel/babel/pull/15810)) | ||
| If anyhow you want to restore the Babel 7 behaviour for debug purpose, you can specify the [`exclude` option](./preset-env.md#exclude): `{ exclude: [/bugfix/] }` to explicitly exclude the bugfixes plugins. Note that doing so will bloat the output as Babel has to compile features to older targets. |
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Suggested change
| If anyhow you want to restore the Babel 7 behaviour for debug purpose, you can specify the [`exclude` option](./preset-env.md#exclude): `{ exclude: [/bugfix/] }` to explicitly exclude the bugfixes plugins. Note that doing so will bloat the output as Babel has to compile features to older targets. | |
| If anyhow you want to restore the Babel 7 behaviour for debug purpose, you can specify the [`exclude` option](./preset-env.md#exclude): `{ exclude: [/bugfix/] }` to explicitly exclude the bugfixes plugins. Note that doing so will bloat the output as Babel has to compile general available language features even if they might not be affected by the browser quirk. |
Does the revised wording clarify why the output might be bloated?
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Docs PR for babel/babel#17078.
Closes #3044
Closes #3132