Struct MutationConfig 

pub struct MutationConfig {
    pub runner: MutationRunner,
    pub operators: Option<Vec<MutationOperatorName>>,
    pub min_score: Option<f64>,
    pub concurrency: Option<usize>,
    pub typecheck: Option<bool>,
    pub runner_config: Option<String>,
}

Project settings for fallow mutation.

Project config cannot widen what a run executes: the override that keeps mutants near file system, process, network or database sinks is a CLI flag only (--allow-side-effects), and no key starts a run.

Fields

runner: MutationRunner

The test runner: auto, vitest, node-test or bun-test. auto detects it from the project.

operators: Option<Vec<MutationOperatorName>>

The operators to use. Unset uses each operator. --operators wins.

min_score: Option<f64>

The minimum mutation score, from 0 to 100. When the score of a run is lower, fallow mutation exits with code 1. Unset never fails a run. --min-score wins.

concurrency: Option<usize>

The number of companion processes. Unset uses half the logical cores. --concurrency wins.

typecheck: Option<bool>

Type-check each survived mutant through the TypeScript-Go companion of --type-aware. A survivor that does not type-check becomes compile_error and does not count in the score. Unset or false checks no survivor. --typecheck turns the check on.

runner_config: Option<String>

The config file of the test runner, relative to the project root, for example vitest.integration.config.mjs. The file must exist inside the project root. Only the Vitest runner reads it. Unset uses the default config discovery of the runner. --runner-config wins.

Implementations

impl MutationConfig

pub fn is_default(&self) -> bool

True when no key is set.

Trait Implementations

impl Clone for MutationConfig

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for MutationConfig

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for MutationConfig

fn default() -> Self

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for MutationConfig

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl JsonSchema for MutationConfig

fn schema_name() -> Cow<'static, str>

The name of the generated JSON Schema.

fn schema_id() -> Cow<'static, str>

Returns a string that uniquely identifies the schema produced by this type.

fn json_schema(generator: &mut SchemaGenerator) -> Schema

Generates a JSON Schema for this type.

fn inline_schema() -> bool

Whether JSON Schemas generated for this type should be included directly in parent schemas, rather than being re-used where possible using the $ref keyword.

impl PartialEq for MutationConfig

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl Serialize for MutationConfig

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for MutationConfig