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(value, key) => {\n if (\n value !== null &&\n (typeof value === \"object\" ||\n typeof value === \"function\" ||\n typeof value === \"symbol\")\n ) {\n // Track nodes to restore later.\n if (tracking.has(value)) {\n unpack.set(path.slice(1), tracking.get(value)!);\n return; // Avoid serializing referenced nodes on an expression.\n }\n\n // Track encountered nodes.\n tracking.set(value, path.slice(1));\n }\n\n return valueToString(value, space, onNext, key);\n }\n : (value, key) => {\n // Stop on recursion.\n if (stack.has(value)) return;\n\n stack.add(value);\n const result = valueToString(value, space, onNext, key);\n stack.delete(value);\n return result;\n };\n\n const result = onNext(value, ROOT_SENTINEL);\n\n // Attempt to restore circular references.\n if (unpack.size) {\n const sp = space ? \" \" : \"\";\n const eol = space ? \"\\n\" : \"\";\n let wrapper = `var x${sp}=${sp}${result};${eol}`;\n\n for (const [key, value] of unpack.entries()) {\n const keyPath = stringifyPath(key, onNext);\n const valuePath = stringifyPath(value, onNext);\n\n wrapper += `x${keyPath}${sp}=${sp}x${valuePath};${eol}`;\n }\n\n return `(function${sp}()${sp}{${eol}${wrapper}return x;${eol}}())`;\n }\n\n return result;\n}\n\n/**\n * Create `toString()` function from replacer.\n */\nfunction replacerToString(replacer?: ToString | null): ToString {\n if (!replacer) return toString;\n\n return (value, space, next, key) => {\n return replacer(\n value,\n space,\n (value: any) => toString(value, space, next, key),\n key\n );\n };\n}\n"]}
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