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import { BigNumber } from '@0x/utils';
import { ValueTransformer } from 'typeorm/decorator/options/ValueTransformer';
const decimalRadix = 10;
// Can be used to convert a JavaScript number type to a Postgres bigint type and
// vice versa. By default TypeORM will silently convert number types to string
// if the corresponding Postgres type is bigint. See
// https://github.com/typeorm/typeorm/issues/2400 for more information.
export class NumberToBigIntTransformer implements ValueTransformer {
// tslint:disable-next-line:prefer-function-over-method
public to(value: number): string | null {
if (value === null || value === undefined) {
return null;
} else {
return value.toString();
}
}
// tslint:disable-next-line:prefer-function-over-method
public from(value: string): number {
if (new BigNumber(value).isGreaterThan(Number.MAX_SAFE_INTEGER)) {
throw new Error(
`Attempted to convert PostgreSQL bigint value (${value}) to JavaScript number type but it is too big to safely convert`,
);
}
return Number.parseInt(value, decimalRadix);
}
}
export const numberToBigIntTransformer = new NumberToBigIntTransformer();
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