This document was generated from 'src/documentation/print-linter-wiki.ts' on 2025-07-21, 11:41:51 UTC presenting an overview of flowR's linter (v2.2.16, using R v4.5.0). Please do not edit this file/wiki page directly.

Checks whether randomness-based function calls are preceded by a random seed generation function. For consistent reproducibility, functions that use randomness should only be called after a constant random seed is set using a function like set.seed.
This linting rule is implemented in src/linter/rules/seeded-randomness.ts.

Linting rules can be configured by passing a configuration object to the linter query as shown in the example below. The seeded-randomness rule accepts the following configuration options:

• randomnessConsumers
  A set of randomness consumer function names that require a seed to be set prior to invocation.
• randomnessProducers
  A set of functions and variables whose invocation or assignment causes a random seeded to be set. Each entry has a type, which is either function or assignment, and a name, which is the name of the function or variable. The default value for this is the function set.seed and the variable .Random.seed.

runif(1)

The linting query can be used to run this rule on the above example:

[ { "type": "linter",   "rules": [ { "name": "seeded-randomness",     "config": {} } ] } ]

Results (prettified and summarized):

Query: linter (1 ms)
   ╰ Seeded Randomness (seeded-randomness):
       ╰ definitely:
           ╰ Function runif at 1.1-8
       ╰ Metadata: {"consumerCalls":1,"callsWithFunctionProducers":0,"callsWithAssignmentProducers":0,"callsWithNonConstantProducers":0,"searchTimeMs":0,"processTimeMs":0}
All queries together required ≈1 ms (1ms accuracy, total 7 ms)

{
  "linter": {
    "results": {
      "seeded-randomness": {
        "results": [
          {
            "certainty": "definitely",
            "function": "runif",
            "range": [
              1,
              1,
              1,
              8
            ]
          }
        ],
        ".meta": {
          "consumerCalls": 1,
          "callsWithFunctionProducers": 0,
          "callsWithAssignmentProducers": 0,
          "callsWithNonConstantProducers": 0,
          "searchTimeMs": 0,
          "processTimeMs": 0
        }
      }
    },
    ".meta": {
      "timing": 1
    }
  },
  ".meta": {
    "timing": 1
  }
}

These examples are synthesized from the test cases in: test/functionality/linter/lint-seeded-randomness.test.ts

Given the following input:

cat("hello")

We expect the linter to report the following:

* no lints

See here for the test-case implementation.

Given the following input:

runif(1)

We expect the linter to report the following:

[{ range: [1,1,1,8], function: 'runif', certainty: LintingCertainty.Definitely }]

See here for the test-case implementation.

Given the following input:

set.seed(17)

We expect the linter to report the following:

* no lints

See here for the test-case implementation.

Given the following input:

set.seed(17)
runif(1)

We expect the linter to report the following:

* no lints

See here for the test-case implementation.

Given the following input:

runif(1)
set.seed(17)

We expect the linter to report the following:

[{ range: [1,1,1,8], function: 'runif', certainty: LintingCertainty.Definitely }]

See here for the test-case implementation.

Given the following input:

for(i in 1:10) { set.seed(17); runif(1); }

We expect the linter to report the following:

* no lints

See here for the test-case implementation.

Given the following input:

if(FALSE) { set.seed(17); }
runif(1);

We expect the linter to report the following:

[{ range: [2,1,2,8], function: 'runif', certainty: LintingCertainty.Definitely }]

See here for the test-case implementation.

Given the following input:

if(TRUE) { set.seed(17); }
runif(1);

We expect the linter to report the following:

* no lints

See here for the test-case implementation.

Given the following input:

num<-1 + 7;
set.seed(num);
runif(1);

We expect the linter to report the following:

range: [3,1,3,8], function: 'runif', certainty: LintingCertainty.Definitely

See here for the test-case implementation.

Given the following input:

set.seed(runif(1));
runif(1);

We expect the linter to report the following:

range: [1,10,1,17], function: 'runif', certainty: LintingCertainty.Definitely },
{ range: [2,1,2,8], function: 'runif', certainty: LintingCertainty.Definitely

See here for the test-case implementation.

Given the following input:

set.seed(1);
set.seed(2);
runif(1);

We expect the linter to report the following:

* no lints

See here for the test-case implementation.

Given the following input:

set.seed(1);
set.seed(2);
runif(1);
runif(1);

We expect the linter to report the following:

* no lints

See here for the test-case implementation.

Given the following input:

set.seed <- function(x) {}
set.seed(17)
runif(1)

We expect the linter to report the following:

[{ range: [3,1,3,8], function: 'runif', certainty: LintingCertainty.Definitely }]

See here for the test-case implementation.

Given the following input:

.Random.seed <- 17
runif(1)

We expect the linter to report the following:

* no lints

See here for the test-case implementation.

Given the following input:

.Random.seed <- 17
x <- 7 
runif(1)

We expect the linter to report the following:

* no lints

See here for the test-case implementation.

Given the following input:

17 -> .Random.seed
runif(1)

We expect the linter to report the following:

* no lints

See here for the test-case implementation.

Given the following input:

`<-`<-function(){}
.Random.seed <- 17
runif(1)

We expect the linter to report the following:

[{ range: [3,1,3,8], function: 'runif', certainty: LintingCertainty.Definitely }]

See here for the test-case implementation.

Given the following input:

runif(set.seed(17))

We expect the linter to report the following:

[{ range: [1,1,1,19], function: 'runif', certainty: LintingCertainty.Definitely }]

See here for the test-case implementation.

Given the following input:

runif(runif(1))

We expect the linter to report the following:

range: [1,7,1,14], function: 'runif', certainty: LintingCertainty.Definitely },
{ range: [1,1,1,15], function: 'runif', certainty: LintingCertainty.Definitely

See here for the test-case implementation.