how to add functions to CanvasRenderingContext2D prototype in typescript
I want to add a function on CanvasRenderingContext2D. what it does is to draw a circle text.
in javascript, all I need to do is write code like this:
CanvasRenderingContext2D.prototype.fillTextCircle = function () {
//some code
}
however it desen't work in typescript.
I also try these two methods:
1.
add following code at the file header
interface CanvasRenderingContext2D {
fillTextCircle: any;
}
CanvasRenderingContext2D.prototype.fillTextCircle = function () {
//some code
}
2.
add this line in lib.dom.d.ts
interface CanvasRenderingContext2D extends CanvasState, CanvasTransform, CanvasCompositing, CanvasImageSmoothing, CanvasFillStrokeStyles, CanvasShadowStyles, CanvasFilters, CanvasRect, CanvasDrawPath, CanvasUserInterface, CanvasText, CanvasDrawImage, CanvasImageData, CanvasPathDrawingStyles, CanvasTextDrawingStyles, CanvasPath {
readonly canvas: HTMLCanvasElement;
fillTextCircle: any; //add this line in lib.dom.d.ts
}
but it still complains this error:
Property 'fillTextCircle' does not exist on type
'CanvasRenderingContext2D'.
javascript typescript
edited Nov 21 '18 at 7:01
Julian Stark
1,3031526
asked Nov 21 '18 at 3:09
JohnJohn
70111
add a comment |
I want to add a function on CanvasRenderingContext2D. what it does is to draw a circle text.
in javascript, all I need to do is write code like this:
CanvasRenderingContext2D.prototype.fillTextCircle = function () {
//some code
}
however it desen't work in typescript.
I also try these two methods:
1.
add following code at the file header
interface CanvasRenderingContext2D {
fillTextCircle: any;
}
CanvasRenderingContext2D.prototype.fillTextCircle = function () {
//some code
}
2.
add this line in lib.dom.d.ts
interface CanvasRenderingContext2D extends CanvasState, CanvasTransform, CanvasCompositing, CanvasImageSmoothing, CanvasFillStrokeStyles, CanvasShadowStyles, CanvasFilters, CanvasRect, CanvasDrawPath, CanvasUserInterface, CanvasText, CanvasDrawImage, CanvasImageData, CanvasPathDrawingStyles, CanvasTextDrawingStyles, CanvasPath {
readonly canvas: HTMLCanvasElement;
fillTextCircle: any; //add this line in lib.dom.d.ts
}
but it still complains this error:
Property 'fillTextCircle' does not exist on type
'CanvasRenderingContext2D'.
javascript typescript
edited Nov 21 '18 at 7:01
Julian Stark
1,3031526
asked Nov 21 '18 at 3:09
JohnJohn
70111
1
Please check other questions, see e.g. here.
– Stefan Hanke
Nov 21 '18 at 4:37
all right,I got it ! so I cannot modified the interface directly in lib.dom.d.ts.but I create a global.d.ts and add the following code: ` interface CanvasRenderingContext2D { fillTextCircle: any; } ` It works!
– John
Nov 21 '18 at 6:44
add a comment |
I want to add a function on CanvasRenderingContext2D. what it does is to draw a circle text.
in javascript, all I need to do is write code like this:
CanvasRenderingContext2D.prototype.fillTextCircle = function () {
//some code
}
however it desen't work in typescript.
I also try these two methods:
1.
add following code at the file header
interface CanvasRenderingContext2D {
fillTextCircle: any;
}
CanvasRenderingContext2D.prototype.fillTextCircle = function () {
//some code
}
2.
add this line in lib.dom.d.ts
interface CanvasRenderingContext2D extends CanvasState, CanvasTransform, CanvasCompositing, CanvasImageSmoothing, CanvasFillStrokeStyles, CanvasShadowStyles, CanvasFilters, CanvasRect, CanvasDrawPath, CanvasUserInterface, CanvasText, CanvasDrawImage, CanvasImageData, CanvasPathDrawingStyles, CanvasTextDrawingStyles, CanvasPath {
readonly canvas: HTMLCanvasElement;
fillTextCircle: any; //add this line in lib.dom.d.ts
}
but it still complains this error:
Property 'fillTextCircle' does not exist on type
'CanvasRenderingContext2D'.
javascript typescript
edited Nov 21 '18 at 7:01
Julian Stark
1,3031526
asked Nov 21 '18 at 3:09
JohnJohn
70111
I want to add a function on CanvasRenderingContext2D. what it does is to draw a circle text.
in javascript, all I need to do is write code like this:
CanvasRenderingContext2D.prototype.fillTextCircle = function () {
//some code
}
however it desen't work in typescript.
I also try these two methods:
1.
add following code at the file header
interface CanvasRenderingContext2D {
fillTextCircle: any;
}
CanvasRenderingContext2D.prototype.fillTextCircle = function () {
//some code
}
2.
add this line in lib.dom.d.ts
interface CanvasRenderingContext2D extends CanvasState, CanvasTransform, CanvasCompositing, CanvasImageSmoothing, CanvasFillStrokeStyles, CanvasShadowStyles, CanvasFilters, CanvasRect, CanvasDrawPath, CanvasUserInterface, CanvasText, CanvasDrawImage, CanvasImageData, CanvasPathDrawingStyles, CanvasTextDrawingStyles, CanvasPath {
readonly canvas: HTMLCanvasElement;
fillTextCircle: any; //add this line in lib.dom.d.ts
}
but it still complains this error:
Property 'fillTextCircle' does not exist on type
'CanvasRenderingContext2D'.
javascript typescript
javascript typescript
edited Nov 21 '18 at 7:01
Julian Stark
1,3031526
asked Nov 21 '18 at 3:09
JohnJohn
70111
edited Nov 21 '18 at 7:01
Julian Stark
1,3031526
asked Nov 21 '18 at 3:09
JohnJohn
70111
edited Nov 21 '18 at 7:01
Julian Stark
1,3031526
edited Nov 21 '18 at 7:01
Julian Stark
1,3031526
edited Nov 21 '18 at 7:01
Julian Stark
1,3031526
1,3031526
asked Nov 21 '18 at 3:09
JohnJohn
70111
asked Nov 21 '18 at 3:09
JohnJohn
70111
asked Nov 21 '18 at 3:09
JohnJohn
70111
70111
1
Please check other questions, see e.g. here.
– Stefan Hanke
Nov 21 '18 at 4:37
all right,I got it ! so I cannot modified the interface directly in lib.dom.d.ts.but I create a global.d.ts and add the following code: ` interface CanvasRenderingContext2D { fillTextCircle: any; } ` It works!
– John
Nov 21 '18 at 6:44
add a comment |
1
Please check other questions, see e.g. here.
– Stefan Hanke
Nov 21 '18 at 4:37
all right,I got it ! so I cannot modified the interface directly in lib.dom.d.ts.but I create a global.d.ts and add the following code: ` interface CanvasRenderingContext2D { fillTextCircle: any; } ` It works!
– John
Nov 21 '18 at 6:44
1
1
Please check other questions, see e.g. here.
– Stefan Hanke
Nov 21 '18 at 4:37
Please check other questions, see e.g. here.
– Stefan Hanke
Nov 21 '18 at 4:37
all right,I got it ! so I cannot modified the interface directly in lib.dom.d.ts.but I create a global.d.ts and add the following code: ` interface CanvasRenderingContext2D { fillTextCircle: any; } ` It works!
– John
Nov 21 '18 at 6:44
all right,I got it ! so I cannot modified the interface directly in lib.dom.d.ts.but I create a global.d.ts and add the following code: ` interface CanvasRenderingContext2D { fillTextCircle: any; } ` It works!
– John
Nov 21 '18 at 6:44
add a comment |
1 Answer
1
active
oldest
votes
just add a global.d.ts,and add the following code:
interface CanvasRenderingContext2D {
fillTextCircle: any;
}
It will work
link question
answered Nov 21 '18 at 6:46
JohnJohn
70111
add a comment |
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just add a global.d.ts,and add the following code:
interface CanvasRenderingContext2D {
fillTextCircle: any;
}
It will work
link question
answered Nov 21 '18 at 6:46
JohnJohn
70111
add a comment |
just add a global.d.ts,and add the following code:
interface CanvasRenderingContext2D {
fillTextCircle: any;
}
It will work
link question
answered Nov 21 '18 at 6:46
JohnJohn
70111
add a comment |
just add a global.d.ts,and add the following code:
interface CanvasRenderingContext2D {
fillTextCircle: any;
}
It will work
link question
answered Nov 21 '18 at 6:46
JohnJohn
70111
just add a global.d.ts,and add the following code:
interface CanvasRenderingContext2D {
fillTextCircle: any;
}
It will work
link question
answered Nov 21 '18 at 6:46
JohnJohn
70111
answered Nov 21 '18 at 6:46
JohnJohn
70111
answered Nov 21 '18 at 6:46
JohnJohn
70111
answered Nov 21 '18 at 6:46
JohnJohn
70111
70111
add a comment |
add a comment |
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1
Please check other questions, see e.g. here.
– Stefan Hanke
Nov 21 '18 at 4:37
all right,I got it ! so I cannot modified the interface directly in lib.dom.d.ts.but I create a global.d.ts and add the following code: ` interface CanvasRenderingContext2D { fillTextCircle: any; } ` It works!
– John
Nov 21 '18 at 6:44