tsz-checker 0.1.9

TypeScript type checker for the tsz compiler
Documentation 
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use tsz_solver::{TypeDatabase, TypeId};

pub(crate) use super::common::{
    array_element_type as get_array_element_type, contains_type_parameters,
    tuple_elements as tuple_elements_for_type, union_members as union_members_for_type,
};

pub(crate) fn union_types(db: &dyn TypeDatabase, members: Vec<TypeId>) -> TypeId {
    tsz_solver::utils::union_or_single(db, members)
}

pub(crate) fn are_types_mutually_subtype(
    db: &dyn TypeDatabase,
    left: TypeId,
    right: TypeId,
) -> bool {
    tsz_solver::is_subtype_of(db, left, right) || tsz_solver::is_subtype_of(db, right, left)
}

pub(crate) fn is_assignable(db: &dyn TypeDatabase, source: TypeId, target: TypeId) -> bool {
    tsz_solver::query_relation(
        db,
        source,
        target,
        tsz_solver::RelationKind::Assignable,
        tsz_solver::RelationPolicy::default(),
        tsz_solver::RelationContext::default(),
    )
    .is_related()
}

pub(crate) fn is_assignable_strict_null(
    db: &dyn TypeDatabase,
    source: TypeId,
    target: TypeId,
) -> bool {
    tsz_solver::query_relation(
        db,
        source,
        target,
        tsz_solver::RelationKind::Assignable,
        tsz_solver::RelationPolicy::from_flags(
            tsz_solver::RelationCacheKey::FLAG_STRICT_NULL_CHECKS,
        ),
        tsz_solver::RelationContext::default(),
    )
    .is_related()
}

pub(crate) const fn is_compound_assignment_operator(operator_token: u16) -> bool {
    tsz_solver::is_compound_assignment_operator(operator_token)
}

pub(crate) const fn map_compound_assignment_to_binary(operator_token: u16) -> Option<&'static str> {
    tsz_solver::map_compound_assignment_to_binary(operator_token)
}

pub(crate) fn fallback_compound_assignment_result(
    db: &dyn TypeDatabase,
    operator_token: u16,
    rhs_literal_type: Option<TypeId>,
) -> Option<TypeId> {
    tsz_solver::fallback_compound_assignment_result(db, operator_token, rhs_literal_type)
}

pub(crate) fn widen_literal_to_primitive(db: &dyn TypeDatabase, type_id: TypeId) -> TypeId {
    tsz_solver::type_queries::widen_literal_to_primitive(db, type_id)
}

pub(crate) fn is_unit_type(db: &dyn TypeDatabase, type_id: TypeId) -> bool {
    tsz_solver::type_queries::is_unit_type(db, type_id)
}

pub(crate) fn are_types_mutually_subtype_with_env(
    db: &dyn TypeDatabase,
    env: &tsz_solver::TypeEnvironment,
    left: TypeId,
    right: TypeId,
    strict_null_checks: bool,
) -> bool {
    types_are_subtype_with_env(db, env, left, right, strict_null_checks)
        || types_are_subtype_with_env(db, env, right, left, strict_null_checks)
}

pub(crate) fn is_assignable_with_env(
    db: &dyn TypeDatabase,
    env: &tsz_solver::TypeEnvironment,
    source: TypeId,
    target: TypeId,
    strict_null_checks: bool,
) -> bool {
    let mut flags = 0u16;
    if strict_null_checks {
        flags |= tsz_solver::RelationCacheKey::FLAG_STRICT_NULL_CHECKS;
    }

    tsz_solver::query_relation_with_resolver(
        db,
        env,
        source,
        target,
        tsz_solver::RelationKind::Assignable,
        tsz_solver::RelationPolicy::from_flags(flags),
        tsz_solver::RelationContext::default(),
    )
    .is_related()
}

fn types_are_subtype_with_env(
    db: &dyn TypeDatabase,
    env: &tsz_solver::TypeEnvironment,
    source: TypeId,
    target: TypeId,
    strict_null_checks: bool,
) -> bool {
    let mut flags = 0u16;
    if strict_null_checks {
        flags |= tsz_solver::RelationCacheKey::FLAG_STRICT_NULL_CHECKS;
    }

    tsz_solver::query_relation_with_resolver(
        db,
        env,
        source,
        target,
        tsz_solver::RelationKind::Subtype,
        tsz_solver::RelationPolicy::from_flags(flags),
        tsz_solver::RelationContext::default(),
    )
    .is_related()
}