1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186

use self::scope::Scope;
use crate::{Hook, Load, ModuleId, Resolve};
use ahash::AHashMap;
use anyhow::{Context, Error};
use std::collections::HashMap;
use swc_atoms::JsWord;
use swc_common::{sync::Lrc, FileName, Globals, Mark, SourceMap, SyntaxContext, DUMMY_SP, GLOBALS};
use swc_ecma_ast::Module;

mod chunk;
mod export;
mod finalize;
mod helpers;
mod import;
mod keywords;
mod load;
mod optimize;
mod scope;
#[cfg(test)]
pub(crate) mod tests;

#[derive(Debug, Default)]
pub struct Config {
    /// If it's true, [Bundler] searches for require calls.
    pub require: bool,

    /// If it's true, many temporary variables will be generated.
    ///
    /// This option exists mainly for testing. As inlining and dce removes all
    /// temporary variables, it's really hard to see what's going on.
    pub disable_inliner: bool,

    /// List of modules which should be preserved.
    pub external_modules: Vec<JsWord>,

    /// Type of emitted module
    pub module: ModuleType,
}

#[derive(Debug, PartialEq, Eq, Hash)]
pub enum ModuleType {
    Es,
    Iife,
}

impl Default for ModuleType {
    fn default() -> Self {
        ModuleType::Es
    }
}

#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub enum BundleKind {
    /// User-provided entry
    Named { name: String },
    /// Auto-generated entry (created by import expression)
    Dynamic,
    /// A lazy-loaded shared library
    Lib { name: String },
}

/// Built bundle
#[derive(Debug)]
pub struct Bundle {
    pub kind: BundleKind,
    pub id: ModuleId,
    /// Merged module.
    pub module: Module,
}

pub struct Bundler<'a, L, R>
where
    L: Load,
    R: Resolve,
{
    config: Config,

    globals: &'a Globals,
    cm: Lrc<SourceMap>,
    loader: L,
    resolver: R,

    /// [Mark] used while tree shaking
    used_mark: Mark,
    _helper_ctxt: SyntaxContext,
    /// Used to mark nodes as synthesized.
    ///
    /// We can check if a span is a dummy for now, but in future we may improve
    /// spans.
    synthesized_ctxt: SyntaxContext,

    /// Used to mark a variable declaration as injected.
    pub(crate) injected_ctxt: SyntaxContext,

    scope: Scope,

    hook: Box<dyn 'a + Hook>,
}

impl<'a, L, R> Bundler<'a, L, R>
where
    L: Load,
    R: Resolve,
{
    pub fn new(
        globals: &'a Globals,
        cm: Lrc<SourceMap>,
        loader: L,
        resolver: R,
        config: Config,
        hook: Box<dyn 'a + Hook>,
    ) -> Self {
        GLOBALS.set(&globals, || {
            let used_mark = Mark::fresh(Mark::root());
            log::debug!("Used mark: {:?}", DUMMY_SP.apply_mark(used_mark).ctxt());
            let helper_ctxt = SyntaxContext::empty().apply_mark(Mark::fresh(Mark::root()));
            log::debug!("Helper ctxt: {:?}", helper_ctxt);
            let synthesized_ctxt = SyntaxContext::empty().apply_mark(Mark::fresh(Mark::root()));
            log::debug!("Synthesized ctxt: {:?}", synthesized_ctxt);
            let injected_ctxt = SyntaxContext::empty().apply_mark(Mark::fresh(Mark::root()));
            log::debug!("Injected ctxt: {:?}", injected_ctxt);

            Bundler {
                config,
                globals,
                cm,
                loader,
                resolver,
                used_mark,
                _helper_ctxt: helper_ctxt,
                synthesized_ctxt,
                injected_ctxt,
                scope: Default::default(),
                hook,
            }
        })
    }

    ///
    ///
    ///
    /// Note: This method will panic if entries references each other in
    /// circular manner. However, it applies only to the provided `entries`, and
    /// dependencies with circular reference is ok.
    pub fn bundle(&self, entries: HashMap<String, FileName>) -> Result<Vec<Bundle>, Error> {
        let results = entries
            .into_iter()
            .map(|(name, path)| -> Result<_, Error> {
                let res = self
                    .load_transformed(&path)
                    .context("load_transformed failed")?;
                Ok((name, res))
            })
            .collect::<Vec<_>>();

        // We collect at here to handle dynamic imports
        // TODO: Handle dynamic imports

        let local = {
            let mut output = AHashMap::default();

            for res in results {
                let (name, m) = res?;
                let m = m.unwrap();

                output.insert(name, m);
            }

            output
        };

        let bundles = self.chunk(local)?;

        let bundles = self.finalize(bundles)?;
        Ok(bundles)
    }

    /// Sets `swc_common::GLOBALS`
    #[inline]
    fn run<F, Ret>(&self, op: F) -> Ret
    where
        F: FnOnce() -> Ret,
    {
        GLOBALS.set(self.globals, op)
    }
}