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@cybozu/ts-asserts
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Assertion Library with TS 3.7 Assertion Function
# npm
$ npm install @cybozu/ts-asserts
# yarn
$ yarn add @cybozu/ts-asserts
In bellow example, if typeof value === number
is true, TypeScript assumes value
is number type after assert
is called. If not, assert
throws AssertionError
.
import { assert } from "@cybozu/ts-asserts";
function unknownToNumber(value: unknown): number {
assert(typeof value === "number");
return value;
}
If you want to use a custom error message, you can provide the message to 2nd argument of assert
. %s
in a custom error message is replaced to 3rd and subsequent arguments.
assert(type value === 'number', "value isn't number");
assert(type value === 'number', "value isn't %s: %s", "number", String(value));
Besides assert
, @cybozu/ts-asserts
has several assertion functions:
assertArray(value: unknown, message?: string, ...args: string[])
assertBoolean(value: unknown, message?: string, ...args: string[])
assertNumber(value: unknown, message?: string, ...args: string[])
assertFinite(value: unknown, message?: string, ...args: string[])
assertFunction(value: unknown, message?: string, ...args: string[])
assertExists(value: unknown, message?: string, ...args: string[])
assertInstanceOf(value: unknown, type: T, message?: string, ...string[])
assetObject(value: unknown, message?: string, ...args: string[])
fail(message?: string, ...args: string[])
To disable the assertions, you can use the DISABLE_TS_ASSERTS
environment variable.
The below command line is the example which disables the assertions of ts-asserts in Node.js:
$ DISABLE_TS_ASSERT=1 node something.js
In webpack, DefinePlugin
is suitable:
new webpack.DefinePlugin({
DISABLE_TS_ASSERTS: true
});
If you want to disable/enable assertion programmatically, you can use disable()
or enable()
.
import { disable, enable } from "@cybozu/ts-asserts";
disable();
// ...Assertion functions never throw an error.
enable();
// ...Assertion functions throw an error.
FAQs
Assertion Library with TS 3.7 Assertion Funnction
The npm package @cybozu/ts-asserts receives a total of 9 weekly downloads. As such, @cybozu/ts-asserts popularity was classified as not popular.
We found that @cybozu/ts-asserts demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 8 open source maintainers collaborating on the project.
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