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babel-plugin-typescript-non-null-assertion-runtime
Advanced tools
TypeScript has non-null-assertion to assert some expression is not nullable
.
But it's a type only feature. Which means nothing will happend if the non-nullable
value is nullable
. It's a little hard to call it an assertion
.
This plugin will adds runtime assert into all TypeScript non-null-assertion
. And also we can add some additional easily.
With runtime assertion, we may find bugs as early as possible.
yarn add babel-plugin-typescript-non-null-assertion-runtime --dev
If we have below code:
const a = {
b: 1,
};
a!.b = 1;
a.b! = 2;
const c = a!.b;
const d = a.b!;
And it will transform to:
function _nonNull(expr, message = "NonNull assertion failed") {
if (expr === undefined || expr === null) {
throw new Error(message);
}
return expr;
}
const a = {
b: 1,
};
_nonNull(a).b = 1;
a.b! = 2;
const c = _nonNull(a).b;
const d = _nonNull(a.b);
assertFunctionName
: optional, name of assert function.assertMessage
: optional, error message of assert.errorMessageIncludeSource
: optional, include assert expression into error message.FAQs
## Summary
We found that babel-plugin-typescript-non-null-assertion-runtime demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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