refactor(): create Filler base class for Pattern/Gradient

[ShaMan123]

Motivation

1. allow instance of Filler as part of fix(): typeAssertions not respecting subclasses #8931
2. share some interface
3. port some of refactor(): Pattern Gradient transform #8263

Description

Changes

• moved isFiller, TFiller under filler => caused a lot of import changes
• rm isPattern in favor of instance of used only by canvas. We can add a dummy super class if you prefer to do instanceof checks against it but importing Pattern is ok, not cycles.
• export Filler base class with min logic/interface

Gist

In Action

[github-actions]

Build Stats

file / KB (diff)	bundled	minified
fabric	920.076 (+0.027)	303.926 (+0.170)

[github-actions]

Coverage after merging rm-filler-type-assertions into master will be

83.67%

Coverage Report

File	Stmts	Branches	Funcs	Lines	Uncovered Lines
index.node.ts	47.83%	100%	25%	60%	17, 20, 23, 40, 43, 46
src
ClassRegistry.ts	100%	100%	100%	100%
Collection.ts	94.71%	94.64%	86.67%	97.09%	101, 104, 207–208, 233–234
CommonMethods.ts	96.55%	87.50%	100%	100%	10
Intersection.ts	100%	100%	100%	100%
Observable.ts	87.23%	85.29%	84.62%	89.36%	144–145, 170–171, 39–40, 48, 57, 91, 99
Point.ts	100%	100%	100%	100%
Shadow.ts	98.36%	95.65%	100%	100%	178
cache.ts	97.06%	90%	100%	100%	57
config.ts	75%	66.67%	66.67%	82.76%	130, 138, 138, 138, 138, 138–140, 151–153
constants.ts	100%	100%	100%	100%
src/Pattern
Pattern.ts	91.55%	90.91%	90%	92.86%	102, 113, 122, 28, 77
src/brushes
BaseBrush.ts	100%	100%	100%	100%
CircleBrush.ts	0%	0%	0%	0%	107, 107, 107, 109, 111, 113–115, 117–120, 127–128, 135, 137, 22–23, 31–35, 39–43, 50–53, 61–65, 67, 75, 75, 75, 75, 75–76, 78, 78, 78–81, 83, 91–92, 94, 96–98
PatternBrush.ts	97.06%	87.50%	100%	100%	21
PencilBrush.ts	91.01%	82.35%	100%	93.75%	122–123, 152, 152–154, 176, 176, 276, 280, 285–286, 68–69, 84–85
SprayBrush.ts	0%	0%	0%	0%	106, 106, 106, 106, 106–107, 109–110, 117–118, 120, 122–126, 135, 139–140, 140, 148, 148, 148–151, 153–156, 16, 160–161, 163, 165–168, 17, 171, 178–179, 181, 183–184, 186, 19, 193–194, 196–197, 20, 200, 200, 207, 207, 21, 21, 21, 211, 22–23, 27, 36, 43, 50, 57, 64, 83–85, 93–95, 97–98
src/canvas
Canvas.ts	78.87%	77.54%	81.67%	79.41%	1001–1002, 1002, 1002–1004, 1006–1007, 1007, 1007, 1009, 1017, 1017, 1017–1019, 1019, 1019, 1025–1026, 1034–1035, 1035, 1035–1036, 1041, 1043, 1074–1076, 1079–1080, 1084–1085, 1198–1200, 1203–1204, 1277, 1396, 1519, 1589, 162, 187, 297–298, 301–305, 310, 333–334, 339–344, 364, 364, 364–365, 365, 365–366, 37, 374, 379–380, 380, 380–381, 383, 392, 398–399, 399, 399, 41, 442, 450, 454, 454, 454–455, 457, 539–540, 540, 540–541, 547, 547, 547–549, 569, 571, 571, 571–572, 572, 572, 575, 575, 575–576, 579, 588–589, 591–592, 594, 594–595, 597–598, 610–611, 611, 611–612, 614–619, 625, 632, 669, 669, 669, 671, 673–678, 684, 690, 690, 690–691, 693, 696, 701, 714, 742, 742, 800–801, 801, 801–802, 804, 807–808, 808, 808–809, 811–812, 815, 815–817, 820–821, 891, 903, 910, 931, 963, 984–985
SelectableCanvas.ts	94.39%	91.16%	94.64%	96.62%	1119, 1119–1120, 1123, 1143, 1143, 1201, 1254–1255, 1276, 1284, 1409, 1411, 1413–1414, 518, 698–699, 701–702, 702, 702, 751–752, 813–814, 867–869, 901, 906–907, 934–935
StaticCanvas.ts	97.12%	93.70%	100%	98.61%	1098–1099, 1099, 1099–1100, 1220, 1230, 1284–1285, 1288, 1323–1324, 1401, 1408, 1412, 1468–1469, 306–307, 324, 755, 767–768
TextEditingManager.ts	82.69%	55.56%	91.67%	100%	15, 15, 15, 15, 15, 15, 15, 15
src/color
Color.ts	94.96%	91.67%	96.30%	96.05%	233, 258–259, 267–268, 48
color_map.ts	100%	100%	100%	100%
constants.ts	100%	100%	100%	100%
util.ts	85.71%	76.92%	100%	89.74%	55–56, 56, 58, 58, 58–59, 61–62, 89
src/controls
Control.ts	93.33%	87.88%	91.67%	97.78%	175, 240, 327, 327, 362
changeWidth.ts	100%	100%	100%	100%
commonControls.ts	100%	100%	100%	100%
controlRendering.ts	81.63%	78%	100%	84.78%	106, 111, 121, 121, 45, 50, 61, 61, 65–72, 81–82
drag.ts	100%	100%	100%	100%
fireEvent.ts	88.89%	75%	100%	100%	13
polyControl.ts	5.97%	0%	0%	11.11%	100, 105, 119, 119, 119, 119, 119, 121–124, 124, 127, 134, 17, 25–29, 29, 29, 29, 29, 29, 29, 29, 50–56, 56, 56, 56, 56, 58, 63–64, 66, 76, 82–83, 83, 83–84, 88–90, 90, 90, 90, 90, 92
rotate.ts	19.57%	12.50%	50%	21.43%	41, 45, 51, 51, 51–52, 55–57, 59, 59, 59, 59, 59–61, 61, 61–63, 65, 65, 65–67, 67, 67–68, 73, 73, 73–74, 76, 78, 80–81
scale.ts	93.57%	92.94%	100%	93.67%	129–130, 132–134, 148–149, 181–183, 42
scaleSkew.ts	78.79%	64.29%	100%	85.71%	27, 29, 29, 29, 31, 33, 35
skew.ts	91.03%	79.31%	100%	97.67%	130–131, 162–163, 170, 176, 178
util.ts	100%	100%	100%	100%
wrapWithFireEvent.ts	100%	100%	100%	100%
wrapWithFixedAnchor.ts	100%	100%	100%	100%
src/env
browser.ts	84.21%	77.78%	50%	100%	14, 17
index.ts	100%	100%	100%	100%
node.ts	74.07%	33.33%	66.67%	88.89%	27, 31–32, 32, 32, 37
src/fillers
Filler.ts	62.50%	50%	60%	71.43%	47, 47, 47, 59
src/filters