| 8 | * @returns {string} Consistent JSON string which can be used for hashing. |
| 9 | */ |
| 10 | export function jsonStringify( |
| 11 | x: any, |
| 12 | replacer?: (this: any, key: string, value: any) => any | Array<number> | Array<string> | null, |
| 13 | space?: string | number |
| 14 | ): string |
| 15 | { |
| 16 | const spacing = typeof space === 'number' ? new Array(isFinite(space) ? space + 1 : 0).join(' ') : (space ?? ''); |
| 17 | const separator = spacing ? ': ' : ':'; |
| 18 | const seen = new Set<any>(); |
| 19 | const indents = ['']; |
| 20 | |
| 21 | const indentify = (level: number): string => |
| 22 | { |
| 23 | while (indents.length <= level) |
| 24 | { |
| 25 | indents.push(indents[indents.length - 1] + spacing); |
| 26 | } |
| 27 | |
| 28 | return indents[level]; |
| 29 | }; |
| 30 | |
| 31 | const stringify = (parent: any, key: string, node: any, level: number): string => |
| 32 | { |
| 33 | if (node && node.toJSON && typeof node.toJSON === 'function') |
| 34 | { |
| 35 | node = node.toJSON(); |
| 36 | } |
| 37 | |
| 38 | if (replacer) |
| 39 | { |
| 40 | node = replacer.call(parent, key, node); |
| 41 | } |
| 42 | |
| 43 | if (node === undefined) |
| 44 | { |
| 45 | return ''; |
| 46 | } |
| 47 | |
| 48 | if (node === null) |
| 49 | { |
| 50 | return 'null'; |
| 51 | } |
| 52 | |
| 53 | if (typeof node === 'number') |
| 54 | { |
| 55 | return isFinite(node) ? String(node) : 'null'; |
| 56 | } |
| 57 | |
| 58 | if (typeof node !== 'object') |
| 59 | { |
| 60 | return JSON.stringify(node); |
| 61 | } |
| 62 | |
| 63 | if (seen.has(node)) |
| 64 | { |
| 65 | return 'null'; |
| 66 | } |
| 67 | |