beginPath method Null safety

1. Dart
2. dart:html
3. CanvasRenderingContext2D
4. beginPath method

CanvasRenderingContext2D class

1. Properties
2. backingStorePixelRatio
3. canvas
4. currentTransform
5. direction
6. fillStyle
7. filter
8. font
9. globalAlpha
10. globalCompositeOperation
11. hashCode
12. imageSmoothingEnabled
13. imageSmoothingQuality
14. lineCap
15. lineDashOffset
16. lineJoin
17. lineWidth
18. miterLimit
19. runtimeType
20. shadowBlur
21. shadowColor
22. shadowOffsetX
23. shadowOffsetY
24. strokeStyle
25. textAlign
26. textBaseline
27. Methods
28. addHitRegion
29. arc
30. arcTo
31. beginPath
32. bezierCurveTo
33. clearHitRegions
34. clearRect
35. clip
36. closePath
37. createImageData
38. createImageDataFromImageData
39. createLinearGradient
40. createPattern
41. createPatternFromImage
42. createRadialGradient
43. drawFocusIfNeeded
44. drawImage
45. drawImageScaled
46. drawImageScaledFromSource
47. drawImageToRect
48. ellipse
49. fill
50. fillRect
51. fillText
52. getContextAttributes
53. getImageData
54. getLineDash
55. isContextLost
56. isPointInPath
57. isPointInStroke
58. lineTo
59. measureText
60. moveTo
61. noSuchMethod
62. putImageData
63. quadraticCurveTo
64. rect
65. removeHitRegion
66. resetTransform
67. restore
68. rotate
69. save
70. scale
71. scrollPathIntoView
72. setFillColorHsl
73. setFillColorRgb
74. setLineDash
75. setStrokeColorHsl
76. setStrokeColorRgb
77. setTransform
78. stroke
79. strokeRect
80. strokeText
81. toString
82. transform
83. translate
84. Operators
85. operator ==