oxc/crates/oxc_minifier/src/options.rs

#[derive(Debug, Clone, Copy)]
pub struct CompressOptions {
    pub remove_syntax: bool,
    pub substitute_alternate_syntax: bool,
    pub fold_constants: bool,
    pub remove_dead_code: bool,
    pub collapse: bool,

    /// Various optimizations for boolean context, for example `!!a ? b : c` → `a ? b : c`.
    ///
    /// Default `true`
    pub booleans: bool,

    /// Remove `debugger;` statements.
    ///
    /// Default `true`
    pub drop_debugger: bool,

    /// Remove `console.*` statements.
    ///
    /// Default `false`
    pub drop_console: bool,

    /// Attempt to evaluate constant expressions
    ///
    /// Default `true`
    pub evaluate: bool,

    /// Join consecutive var statements.
    ///
    /// Default `true`
    pub join_vars: bool,

    /// Optimizations for do, while and for loops when we can statically determine the condition
    ///
    /// Default `true`
    pub loops: bool,

    /// Transforms `typeof foo == "undefined" into `foo === void 0`
    ///
    /// Default `true`
    pub typeofs: bool,
}

impl Default for CompressOptions {
    fn default() -> Self {
        Self {
            remove_syntax: true,
            substitute_alternate_syntax: true,
            fold_constants: true,
            remove_dead_code: true,
            collapse: true,
            booleans: true,
            drop_debugger: true,
            drop_console: false,
            evaluate: true,
            join_vars: true,
            loops: true,
            typeofs: true,
        }
    }
}

impl CompressOptions {
    pub fn all_true() -> Self {
        Self {
            booleans: true,
            drop_debugger: true,
            drop_console: true,
            evaluate: true,
            join_vars: true,
            loops: true,
            typeofs: true,
            ..Self::default()
        }
    }

    pub fn all_false() -> Self {
        Self {
            remove_syntax: false,
            substitute_alternate_syntax: false,
            fold_constants: false,
            remove_dead_code: false,
            collapse: false,
            booleans: false,
            drop_debugger: false,
            drop_console: false,
            evaluate: false,
            join_vars: false,
            loops: false,
            typeofs: false,
        }
    }

    pub fn dead_code_elimination() -> Self {
        Self { fold_constants: true, remove_dead_code: true, ..Self::all_false() }
    }
}