공통 에러
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In this section we explain a number of common error codes that users experience in the real world.
Samples:
Cannot find name ga
Cannot find name $
Cannot find module jquery
You are probably using a third party library (e.g. google analytics) and don't have it declare
d. TypeScript tries to save you from spelling mistakes and using variables without declaring them so you need to be explicit on anything that is available at runtime because of you including some external library ().
Samples:
Cannot find module 'underscore'
You are probably using a third party library (e.g. underscore) as a module () and don't have the ambient declaration file for it ().
Sample:
Cannot compile modules unless the '--module' flag is provided
Checkout the .
Sample:
TypeScript is protecting you from JavaScript code in the wild being wrong. Use a type guard instead:
ElementClass
cannot simultaneously extend types Component
and Component
This happens when you have two react.d.ts
(@types/react/index.d.ts
) in the compilation context.
Fix:
Delete node_modules
and any package-lock
(or yarn lock) and npm install
again.
If it doesn't work, find the invalid module (all modules used by your project should have react.d.ts
as a peerDependency
and not a hard dependency
) and report it on their project.