io.TeeReader
standard libraryThe 1623rd most-called standard-library function by production calls. Called 4,637 times across 201 modules; 390 of those run outside tests and generated code.
0% in production calls vs 2026-W39 (389 → 390)
- prod calls
- 390
- non-test, non-generated
- all calls
- 4,637
- total callsites
- modules
- 201
- distinct callers
- in loop
- 5%
- of prod calls
- in tests
- 2%
- 77 calls
- resolved
- 100%
- to a known target
resolution mix
How each call resolves
How each call was attributed. Only resolved kinds, where the target function is known, count toward the ranking. Interface dispatch and unresolved receivers are reported separately and never guessed. Read the taxonomy →
- Package function100%A direct call to an exported package function, resolved by type.
who calls this
Notable callers
Production calls into TeeReader from notable Go projects. Open one on the map to see what else it hammers.
- Docker 30 8%
- containerd 24 6%
- Grafana 9 2%
- Vault 9 2%
- HashiCorp 6 2%
where it's called
Callsites in the wild
12 representative callsites of 4,637, prioritizing in-loop and non-test usage. We link to source, never display it.
- in loop
-
containerd/stargz-snapshotter/estargz @v0.18.2
estargz.go:988
in loop -
baidubce/bce-sdk-go @v0.9.276
in loop -
charmbracelet/x/exp/teatest @v0.0.0-20260927004216-9c77d672503d
teatest.go:94
in loop - in loop
- in loop
- in loop
- in loop
- in loop
- in loop
- in loop
-
tsenart/vegeta @v11.4.0+incompatible
in loop
top callers
The modules that reach for it
The modules that call TeeReader most in this snapshot.
- github.com/aws/aws-sdk-go-v2/service/ec275116%
- github.com/aws/aws-sdk-go-v2/service/ssm44410%
- github.com/aws/aws-sdk-go-v2/service/rds2996%
- github.com/aws/aws-sdk-go-v2/service/cloudfront2926%
- github.com/aws/aws-sdk-go-v2/service/redshift2736%
siblings
More from io
The other most-called functions in this package. See all →