@contrast/patcher
v1.13.0
Published
Advanced monkey patching--registers hooks to run in and around functions
Downloads
93,731
Maintainers
Keywords
Readme
@contrast/patcher
Monkey patching.
Notes on v5 Parity
This was ported directly from the node-agent
but code with every dependency commented out. As a result there are differences in parity.
Removed dependency on
AsyncStorage
.Old Behavior
Pre and post hooks only run when async storage context indicates an active request scope.
New Behavior
Hooks always run, independent of request scope.
Removed dependency on
agent
andperf-logger
.Old Behavior
A configuration setting would allow for logging of perf data of hooks and original function calls.
New Behavior
Performance logging of hooks is non-funcitonal.
Removed the dependency on
scopes
.Old Behavior
One could specify a
scope
in the hook options and the original function would be run in that scope. This allowed control over when to run instrumentaion based on current scope value.Also, the
alwaysRun
option forced hooks to run independent of scope state.New Behavior
There are no notions of scopes yet in v5. Patcher instrumentation always runs.
The
scope
andalwaysRun
options are effectively ignored.Removed the dependency on
tracker
.Old Behavior
We used to short-circuit
__add
function if tracker showed all arguments to be untracked.New Behavior
We do not make this check; no short-circuiting.