…sts (#5750)

JSON doesn't support functions which are needed to create scriptable options, so implement a very basic method to load a JavaScript file exporting the config in `module.exports`. Also rename test sources (remove the `jasmine.` prefix), cleanup `karma.conf.js` and add an example .js fixture config (bubble radius option).

…of Number (#5752)

…#5790)

In commit c216c0a, the task unittestWatch was removed. However, the watch task links to it, when executed with the test flag. As watching the unittest is possible with `gulp unittest --watch`, this code is not needed anymore and thus removed.

The bar `backgroundColor`, `borderColor`, `borderWidth` and `borderSkipped` options are now scriptable (unit tests, docs and a basic sample). Also fix the gulp task that generates the documentation on Windows.

Use a simpler phrase for this heading.

When the axis lineWidth setting is set to an array, use the first item when determining the size of the axis area.

…#5842)

…harts (#5850)

Moved drawing of radial lines before drawing the tick labels, such that the radial lines are not drawn on top of the tick labels and their backdrop.

Return all items that are at the nearest distance to the point and add unit tests for nearest + axis: 'x' and nearest + axis: 'y'

#5865)

- Calculate the vertices of the shapes so that they are inscribed in the circle that has the radius of `pointRadius`
- Remove `translate()` and `rotate()` to fix the regression introduced by #5319
- Refactor `rectRounded` for better performance

Fix the issue that the topmost tick label and the bottom of the chart area are cut off with a radial scale.

It looks like these classes are a legacy from version 1 but we actually never promoted their usage. Instead, the regular way to create a chart is to set the type in the config, for example: `new Chart(ctx, {type: 'bar'})`. Some types are actually missing (no `Chart.HorizontalBar` or `Chart.Pie`) but it's also not scalable because it can easily conflict with other classes scoped under the `Chart` namespace.

`controllers.*.js` and `core.datasetController.js` are now importable (no more function export), that's why there is so many changes mainly due to one indentation level removed. Split code for `bar/horizontalBar` and `doughnut/pie` in separate files, added a global controllers import (`src/controllers/index.js`) and add tests to check that all dataset controllers are correctly registered under `chart.controllers.{type}`.

Replace repeated function call with compact function, generateData

…5880)

- Remove `Math.round` in the category scale code
- Add `helpers._alignPixel` to align grid/tick/axis border lines
- Fix grid/tick/axis border line calculation
- Add a check of the width of the axis border
- Refactor core.scale code

This changes the behavior of `autoSkip` so that it does not force the
display of the last tick. If the last tick can be displayed with equal
spacing to the rest of the ticks, it will be. Otherwise, it is not.

Prevent "Unsafe assignment to innerHTML" reported by Firefox when submitting addon to their store.

Browserify isn't optimal bundling Chart.js because it adds too many internal wrappers, doesn't handle external/global dependencies and doesn't provide a way to generate ESM builds. Therefore, it seems the right choice to switch to rollup, so move all the build process in `rollup.config.js` and make Gulp to execute `rollup -c`.

We also had to switch to Terser instead of UglifyJS because this last one contains a breaking bug. Note that tests now use the exact same rollup config as our builds (the minified one) to ensure that the bundling and minification steps don't break anything. Finally, replace the `gulp watch` task by `gulp build --watch` to be consistent with the other `unittest` and `docs` watching syntax.

When `display: 'auto'`, the axis is visible only if at least one associated dataset is visible.

…5914)

Fix "RangeError: Maximum call stack size exceeded" exception when calling `Array.push.apply` with too many items (>125000).

* Improve tick generation for linear scales
* Simplify the tick generation code
* Refactor getTickLimit

…chart (#5937)

Scales now export their class and associated defaults (`_defaults`), the registration being done globally in `src/chart.js`.

Samples are supposed to show good practices and in most cases we don't use the time scale but require `Chart.bundle.js`, which is not correct. Instead, we should require the non-bundled version in its minified version (`Chart.min.js`). Paradoxically, time based examples don't use `Chart.bundle.js` but require moment manually side to `Chart.min.js`, which IMO is also the correct way since it allows users to configure and use moment globally (TZ, locales, etc.) and doesn't enforce a specific moment version.

Also remove the `data-labelling.html` example because we now have an [official plugin](https://github.com/chartjs/chartjs-plugin-datalabels) that implements this feature and don't want to deal with user custom code anymore.

Update the docs so that only gulp-cli is installed globally

This moves the mouse over the drawn point and verifies that there is no title in the tooltip and that the body contains expected content.

Merge `core/core.js` in `core/core.controller.js`, split default options next to their associated code and deprecate `Chart.types` (not sure what it was for).

Add a note about resizing the chart height with maintainAspectRatio

These methods shouldn't have been public since they are specific to the chart controller internal logic. Note that this scale custom merging will be removed in v3.

If the container size shrank during chart resize, let's assume scrollbar appeared. So we resize again with the scrollbar visible effectively making chart smaller and the scrollbar hidden again. Because we are inside `throttled`, and currently `ticking`, scroll events are ignored during this whole 2 resize process. If we assumed wrong and something else happened, we are resizing twice in a frame (potential performance issue)

Also update the docs for `xLabel` and `yLabel` to also accept a `number`.