errors with typescript 4.4

[jacekkarczmarczyk]

Expected Behavior

no compilation errors

Current Behavior

ERROR in C:/cygwin64/home/PC/XXX/web/node_modules/chart.js/types/index.esm.d.ts(540,5):
540:5 Cannot find name 'OffscreenCanvasRenderingContext2D'.
    538 |   | string
    539 |   | CanvasRenderingContext2D
  > 540 |   | OffscreenCanvasRenderingContext2D
        |     ^
    541 |   | HTMLCanvasElement
    542 |   | OffscreenCanvas
    543 |   | { canvas: HTMLCanvasElement | OffscreenCanvas }
ERROR in C:/cygwin64/home/PC/XXX/web/node_modules/chart.js/types/index.esm.d.ts(542,5):
542:5 Cannot find name 'OffscreenCanvas'.
    540 |   | OffscreenCanvasRenderingContext2D
    541 |   | HTMLCanvasElement
  > 542 |   | OffscreenCanvas
        |     ^
    543 |   | { canvas: HTMLCanvasElement | OffscreenCanvas }
    544 |   | ArrayLike<CanvasRenderingContext2D | HTMLCanvasElement | OffscreenCanvas>;
    545 |
ERROR in C:/cygwin64/home/PC/XXX/web/node_modules/chart.js/types/index.esm.d.ts(543,35):
543:35 Cannot find name 'OffscreenCanvas'.
    541 |   | HTMLCanvasElement
    542 |   | OffscreenCanvas
  > 543 |   | { canvas: HTMLCanvasElement | OffscreenCanvas }
        |                                   ^
    544 |   | ArrayLike<CanvasRenderingContext2D | HTMLCanvasElement | OffscreenCanvas>;
    545 |
    546 | export declare enum UpdateModeEnum {
ERROR in C:/cygwin64/home/PC/XXX/web/node_modules/chart.js/types/index.esm.d.ts(544,62):
544:62 Cannot find name 'OffscreenCanvas'.
    542 |   | OffscreenCanvas
    543 |   | { canvas: HTMLCanvasElement | OffscreenCanvas }
  > 544 |   | ArrayLike<CanvasRenderingContext2D | HTMLCanvasElement | OffscreenCanvas>;
        |                                                              ^
    545 |
    546 | export declare enum UpdateModeEnum {
    547 |   resize = 'resize',
Version: typescript 4.4.2

Possible Solution

add @types/offscreencanvas maybe?

Steps to Reproduce

create a project with chart.js and typescript 4.4

Environment

• Chart.js version: 3.5.1
• Browser name and version: n/a
• Link to your project: n/a

[ryanhuff]

I'm seeing this too. Any workarounds you've found?

[IceSentry]

Right now, I simply disabled typechecking of external libraries. It's far from ideal, but at least I can still compile and run my code

[etimberg]

This was likely caused by https://github.com/microsoft/TypeScript/pull/44684 which seems to have removed the OffscreenCanvasRenderingContext2D and OffscreenCanvas types because they're only available in Chrome.

[etimberg]

Was resolved in #9617