4:1 error '@testing-library/jest-dom' should be listed in the project's dependencies, not devDependencies import/no-extraneous-dependencies
5:1 error 'jest-canvas-mock' should be listed in the project's dependencies, not devDependencies import/no-extraneous-dependencies
Example: ...\tests\HtmlCanvasSurface.spec.ts
Code in ...\tests\HtmlCanvasSurface.spec.ts:
Solution: add eslint rule
"import/no-extraneous-dependencies": ["error", {"devDependencies": ["**/*.spec.ts", "**/*.spec.tsx"]}]