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@brillout/libassert

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@brillout/libassert

Assertions for library authors.

    0.5.8latest
    Github

Version published
Maintainers
1
Weekly downloads
522
decreased by-33.16%

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@brillout/libassert

Tiny zero-dependency tool for library authors to create assertion functions with clean strack traces.

  • Complete stack traces. (Error.stackTraceLimit = Infinity; only for assertion errors.)
  • Cleaned stack traces. (Fist stack line points to the assertion breaking code, useless stack lines are stripped away.)
  • Error messages are guaranteed to not contain new lines.
import { newError } from "@brillout/libassert"; export { assert }; function assert(condition: unknown): asserts condition { if (condition) { return; } const err = newError( `[${libName}][Internal Error] Something unexpected happened, please open a GitHub issue.`; ); throw err; }

Calling newError(errorMessage) is the same than new Error(errorMessage) except that:

  • The stack trace is complete and cleaned as described above.
  • errorMessage is forbidden to contain new lines.

You can create all kinds of assertion functions, such as assertUsage or assertWarning:

import { newError } from "@brillout/libassert"; export { assert, assertUsage, assertWarning }; const libName = "My Awesome Library"; // Assertions that are expected to always be true (also known as "invariants") function assert(condition: unknown): asserts condition { if (condition) { return; } const err = newError( `[${libName}][Internal Error] Something unexpected happened, please open a GitHub issue.`; ); throw err; } // Wrong usage of your library function assertUsage( condition: unknown, errorMessage: string ): asserts condition { if (condition) { return; } const err = newError(prefix: `[${libName}][Wrong Usage] ${errorMessage}`); throw err; } // Something unexpected happened but it is non-critical and doesn't // warrant interrupting code execution. function assertWarning(condition: unknown, errorMessage: string): void { if (condition) { return; } const err = newError(`[${libName}][Warning] ${errorMessage}`); console.warn(err); }

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Last updated on 20 May 2022

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