Félix Malfait
8b4b9ef8da
Forcing "type" to be explicit, works best will rollup on the frontend to exclude depdendencies
32 lines
742 B
TypeScript
32 lines
742 B
TypeScript
import { type HttpException } from '@nestjs/common';
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type Assert = (
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condition: unknown,
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message?: string,
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ErrorType?: new (message?: string) => HttpException,
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) => asserts condition;
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/**
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* assert condition and throws a HttpException
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*/
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export const assert: Assert = (condition, message, ErrorType) => {
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if (!condition) {
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if (ErrorType) {
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if (message) {
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throw new ErrorType(message);
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}
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throw new ErrorType();
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}
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throw new Error(message);
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}
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};
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export const assertNotNull = <T>(item: T): item is NonNullable<T> =>
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item !== null && item !== undefined;
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export const assertNever = (_value: never, message?: string): never => {
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throw new Error(message ?? "Didn't expect to get here.");
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};
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