29 lines
1.7 KiB
TypeScript
29 lines
1.7 KiB
TypeScript
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// Taken from https://github.com/Ivan-Korolenko/json-with-bigint/blob/main/json-with-bigint.js
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/*
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Function to parse JSON
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If JSON has values presented in a lib's custom format (strings with digits and "n" character at the end), we just parse them to BigInt values (for backward compatibility with previous versions of the lib)
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If JSON has values greater than Number.MAX_SAFE_INTEGER, we convert those values to our custom format, then parse them to BigInt values.
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Other types of values are not affected and parsed as native JSON.parse() would parse them.
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Big numbers are found and marked using RegEx with these conditions:
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- Before the match there is ": OR ":[ OR ":[anyNumberOf(anyCharacters) with no \ before them
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- The match itself has more than 16 digits OR (16 digits and any digit of the number is greater than that of the Number.MAX_SAFE_INTEGER). And it may have a - sign at the start
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- After the match there is , OR } without " after it OR ] without " after it
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*/
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export const JSONParse = (json: string) => {
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const numbersBiggerThanMaxInt =
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/(?<=[^\\]":[\[]?|[^\\]":\[.*)(-?\d{17,}|-?(?:[9](?:[1-9]07199254740991|0[1-9]7199254740991|00[8-9]199254740991|007[2-9]99254740991|007199[3-9]54740991|0071992[6-9]4740991|00719925[5-9]740991|007199254[8-9]40991|0071992547[5-9]0991|00719925474[1-9]991|00719925474099[2-9])))(?=,|\}[^"]|\][^"])/g
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const serializedData = json.replace(numbersBiggerThanMaxInt, `"$1n"`)
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return JSON.parse(serializedData, (_, value) => {
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const isCustomFormatBigInt =
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typeof value === 'string' && Boolean(value.match(/^-?\d+n$/))
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if (isCustomFormatBigInt)
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return BigInt(value.substring(0, value.length - 1))
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return value
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})
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}
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