next_swc_napi/
minify.rs

1/*
2Copyright (c) 2017 The swc Project Developers
3
4Permission is hereby granted, free of charge, to any
5person obtaining a copy of this software and associated
6documentation files (the "Software"), to deal in the
7Software without restriction, including without
8limitation the rights to use, copy, modify, merge,
9publish, distribute, sublicense, and/or sell copies of
10the Software, and to permit persons to whom the Software
11is furnished to do so, subject to the following
12conditions:
13
14The above copyright notice and this permission notice
15shall be included in all copies or substantial portions
16of the Software.
17
18THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
19ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
20TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
21PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
22SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
23CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
24OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
25IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
26DEALINGS IN THE SOFTWARE.
27*/
28
29use napi::bindgen_prelude::*;
30use rustc_hash::FxHashMap;
31use serde::Deserialize;
32use swc_core::{
33    base::{TransformOutput, config::JsMinifyOptions, try_with_handler},
34    common::{FileName, GLOBALS, SourceFile, SourceMap, errors::ColorConfig, sync::Lrc},
35};
36
37use crate::{get_compiler, util::MapErr};
38
39pub struct MinifyTask {
40    c: swc_core::base::Compiler,
41    code: MinifyTarget,
42    opts: JsMinifyOptions,
43}
44
45#[derive(Deserialize)]
46#[serde(untagged)]
47enum MinifyTarget {
48    /// Code to minify.
49    Single(String),
50    /// `{ filename: code }`
51    Map(FxHashMap<String, String>),
52}
53
54impl MinifyTarget {
55    fn to_file(&self, cm: Lrc<SourceMap>) -> Lrc<SourceFile> {
56        match self {
57            MinifyTarget::Single(code) => cm.new_source_file(FileName::Anon.into(), code.clone()),
58            MinifyTarget::Map(codes) => {
59                assert_eq!(
60                    codes.len(),
61                    1,
62                    "swc.minify does not support concatenating multiple files yet"
63                );
64
65                let (filename, code) = codes.iter().next().unwrap();
66
67                cm.new_source_file(FileName::Real(filename.clone().into()).into(), code.clone())
68            }
69        }
70    }
71}
72
73#[napi]
74impl Task for MinifyTask {
75    type Output = TransformOutput;
76
77    type JsValue = TransformOutput;
78
79    fn compute(&mut self) -> napi::Result<Self::Output> {
80        try_with_handler(
81            self.c.cm.clone(),
82            swc_core::base::HandlerOpts {
83                color: ColorConfig::Never,
84                skip_filename: true,
85            },
86            |handler| {
87                GLOBALS.set(&Default::default(), || {
88                    let fm = self.code.to_file(self.c.cm.clone());
89
90                    self.c.minify(fm, handler, &self.opts, Default::default())
91                })
92            },
93        )
94        .map_err(|e| e.to_pretty_error())
95        .convert_err()
96    }
97
98    fn resolve(&mut self, _: napi::Env, output: Self::Output) -> napi::Result<Self::JsValue> {
99        Ok(output)
100    }
101}
102
103#[napi]
104pub fn minify(
105    input: Buffer,
106    opts: Buffer,
107    signal: Option<AbortSignal>,
108) -> napi::Result<AsyncTask<MinifyTask>> {
109    let code = serde_json::from_slice(&input)?;
110    let opts = serde_json::from_slice(&opts)?;
111
112    let c = get_compiler();
113
114    let task = MinifyTask { c, code, opts };
115
116    Ok(AsyncTask::with_optional_signal(task, signal))
117}
118
119#[napi]
120pub fn minify_sync(input: Buffer, opts: Buffer) -> napi::Result<TransformOutput> {
121    let code: MinifyTarget = serde_json::from_slice(&input)?;
122    let opts = serde_json::from_slice(&opts)?;
123
124    let c = get_compiler();
125
126    let fm = code.to_file(c.cm.clone());
127
128    try_with_handler(
129        c.cm.clone(),
130        swc_core::base::HandlerOpts {
131            color: ColorConfig::Never,
132            skip_filename: true,
133        },
134        |handler| {
135            GLOBALS.set(&Default::default(), || {
136                c.minify(fm, handler, &opts, Default::default())
137            })
138        },
139    )
140    .map_err(|e| e.to_pretty_error())
141    .convert_err()
142}
next_swc_napi/minify.rs

next_swc_napi/
minify.rs
