Chart.js/docs/migration/v4-migration.md
Dan Onoshko e7372ade24
fix: same-looking tooltips on charts (#10548)
* fix: same-looking tooltips on multiseries charts

* fix: same-looknig tooltips on all chart types

* chore: restore tooltip plugin

* docs: additions to migration guide

* docs: remove labels from scatter and bubble examples

* docs: review fix
2022-08-18 07:34:35 -04:00

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# 4.x Migration Guide
Chart.js 4.0 introduces a number of breaking changes. We tried keeping the amount of breaking changes to a minimum. For some features and bug fixes it was necessary to break backwars compatibility, but we aimed to do so only when worth the benefit.
## End user migration
### Charts
* Charts don't override the default tooltip callbacks, so all chart types have the same-looking tooltips.
### Options
A number of changes were made to the configuration options passed to the `Chart` constructor. Those changes are documented below.
#### Specific changes
* The radialLinear grid indexable and scriptable options don't decrease the index of the specified grid line anymore.
* The `destroy` plugin hook has been removed and replaced with `afterDestroy`.
* Ticks callback on time scale now receives timestamp instead of a formatted label.
* Linear scales now add and subtracts `5%` of the max value to the range if the min and max are the same instead of `1`.
* If the tooltip callback returns `undefined`, then the default callback will be used.
#### Type changes
* The order of the `ChartMeta` parameters have been changed from `<Element, DatasetElement, Type>` to `<Type, Element, DatasetElement>`.
### General
* Removed fallback to `fontColor` for the legend text and strikethrough color.