feat(node): Local variables via async inspector in node 19+ #9962
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AbhiPrasad
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Dec 21, 2023
anonrig
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Dec 21, 2023
packages/node/src/integrations/localvariables/localvariables-async.ts
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…ctor' into feat/local-variables-async-inspector
anonrig
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Dec 21, 2023
| @@ -3358,6 +3358,30 @@ declare module 'node:inspector' { | |||
| export = inspector; | |||
| } | |||
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| /** | |||
| * @types/node doesn't have a `node:inspector/promises` module, maybe because it's still experimental? | |||
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@types/node has it, but it is under inspector. Ref: https://github.com/DefinitelyTyped/DefinitelyTyped/blob/master/types/node/inspector.d.ts#L1775
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Thats the sync interface with callbacks:
https://github.com/DefinitelyTyped/DefinitelyTyped/blob/a84a09dd3a6ce50a136a7c358c8581f46c812cf1/types/node/inspector.d.ts#L1818
The node:inspector/promises API returns promises:
https://nodejs.org/api/inspector.html#sessionpostmethod-params
…ctor' into feat/local-variables-async-inspector
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AbhiPrasad
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This PR creates a new `LocalVariables` integration that uses the async inspector API. Rather than create a huge messy integration that supports both the sync (node 18) and async (node >= v19) APIs, I created a new integration and wrapped both the sync and async integrations with user facing integration that switches depending on node version. The async API doesn't require the stacking of callbacks that risks stack overflows and limits the number of frames we dare to evaluate. When we tried wrapping the sync API with promises, memory was leaked at an alarming rate! The inspector APIs are not available on all builds of Node so we have to lazily load it and catch any exceptions. I've had to use `dynamicRequire` because webpack picks up `import()` and reports missing dependency when bundling for older versions of node.
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This PR creates a new
LocalVariablesintegration that uses the async inspector API.Rather than create a huge messy integration that supports both the sync (node 18) and async (node >= v19) APIs, I created a new integration and wrapped both the sync and async integrations with user facing integration that switches depending on node version.
The async API doesn't require the stacking of callbacks that risks stack overflows and limits the number of frames we dare to evaluate. When we tried wrapping the sync API with promises, memory was leaked at an alarming rate!
The inspector APIs are not available on all builds of Node so we have to lazily load it and catch any exceptions.
For the new integration I usedimportrather thanrequire. This async importing, coupled with the async API means that errors that occur before the import and debugger is configured will not have local variables attached... hence the addition of timeouts in the integration tests.I've had to use
dynamicRequirebecause webpack picks upimport()and reports missing dependency when bundling for older versions of node.