| 1 | declare module "v8" {
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| 2 | import { Readable } from "stream";
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| 3 |
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| 4 | interface HeapSpaceInfo {
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| 5 | space_name: string;
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| 6 | space_size: number;
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| 7 | space_used_size: number;
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| 8 | space_available_size: number;
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| 9 | physical_space_size: number;
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| 10 | }
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| 11 |
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| 12 | // ** Signifies if the --zap_code_space option is enabled or not. 1 == enabled, 0 == disabled. */
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| 13 | type DoesZapCodeSpaceFlag = 0 | 1;
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| 14 |
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| 15 | interface HeapInfo {
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| 16 | total_heap_size: number;
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| 17 | total_heap_size_executable: number;
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| 18 | total_physical_size: number;
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| 19 | total_available_size: number;
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| 20 | used_heap_size: number;
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| 21 | heap_size_limit: number;
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| 22 | malloced_memory: number;
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| 23 | peak_malloced_memory: number;
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| 24 | does_zap_garbage: DoesZapCodeSpaceFlag;
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| 25 | }
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| 26 |
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| 27 | function getHeapStatistics(): HeapInfo;
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| 28 | function getHeapSpaceStatistics(): HeapSpaceInfo[];
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| 29 | function setFlagsFromString(flags: string): void;
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| 30 | /**
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| 31 | * Generates a snapshot of the current V8 heap and returns a Readable
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| 32 | * Stream that may be used to read the JSON serialized representation.
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| 33 | * This conversation was marked as resolved by joyeecheung
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| 34 | * This JSON stream format is intended to be used with tools such as
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| 35 | * Chrome DevTools. The JSON schema is undocumented and specific to the
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| 36 | * V8 engine, and may change from one version of V8 to the next.
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| 37 | */
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| 38 | function getHeapSnapshot(): Readable;
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| 39 |
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| 40 | /**
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| 41 | *
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| 42 | * @param fileName The file path where the V8 heap snapshot is to be
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| 43 | * saved. If not specified, a file name with the pattern
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| 44 | * `'Heap-${yyyymmdd}-${hhmmss}-${pid}-${thread_id}.heapsnapshot'` will be
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| 45 | * generated, where `{pid}` will be the PID of the Node.js process,
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| 46 | * `{thread_id}` will be `0` when `writeHeapSnapshot()` is called from
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| 47 | * the main Node.js thread or the id of a worker thread.
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| 48 | */
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| 49 | function writeHeapSnapshot(fileName?: string): string;
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| 50 | }
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