Struct Compressor 

pub struct Compressor<'a> { /* private fields */ }

Implementations

impl<'a> Compressor<'a>

pub fn new(allocator: &'a Allocator) -> Self

pub fn build(self, program: &mut Program<'a>, options: CompressOptions)

Full minify: removes dead code and applies size-reducing transforms. For tree-shaking only, see Self::dead_code_elimination.

pub fn build_with_scoping( self, program: &mut Program<'a>, scoping: Scoping, options: CompressOptions, ) -> u8

Returns total number of iterations ran.

Precondition

scoping must be consistent with program in the resolved-reference domain: every resolved IdentifierReference in program must be present in its symbol’s resolved-references list, and no list may contain a ReferenceId whose node is absent from program. The compressor refreshes scoping incrementally — it only prunes references for nodes it drops, and no longer rebuilds liveness from scratch each pass — so a caller that mutated program after building scoping must reflect those edits in scoping. Stale extra references cause missed optimizations (output stays correct); an added reference that was never recorded can cause incorrect output. In-repo callers satisfy this by rebuilding a fresh Scoping immediately before calling this — e.g. crates/oxc/src/compiler.rs rebuilds scoping before compress/DCE whenever ReplaceGlobalDefines reports a change.

pub fn dead_code_elimination( self, program: &mut Program<'a>, options: CompressOptions, ) -> u8

Tree-shaking only: removes dead and unused code, but does not otherwise shrink the output like Self::build. Rolldown runs this on its own.

pub fn dead_code_elimination_with_scoping( self, program: &mut Program<'a>, scoping: Scoping, options: CompressOptions, ) -> u8

Returns total number of iterations ran.

Precondition

Same incoming-scoping consistency requirement as Self::build_with_scoping — see its docs.