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 anyhow::Context;
30use napi::bindgen_prelude::*;
31use napi_derive::napi;
32use serde::Serialize;
33use swc_core::{
34    base::{config::JsMinifyOptions, try_with_handler},
35    common::{FileName, GLOBALS, errors::ColorConfig},
36};
37
38use crate::{get_compiler, util::MapErr};
39
40pub struct MinifyTask {
41    c: swc_core::base::Compiler,
42    code: Option<String>,
43    opts: JsMinifyOptions,
44}
45
46// Same as the swc_core::base::TransformOutput, but using our napi-rs v2's derived #[napi], while
47// swc is already on napi-rs v3.
48#[napi_derive::napi(object)]
49#[derive(Debug, Serialize)]
50pub struct TransformOutput {
51    pub code: String,
52    #[serde(skip_serializing_if = "Option::is_none")]
53    pub map: Option<String>,
54
55    #[serde(skip_serializing_if = "Option::is_none")]
56    pub output: Option<String>,
57    pub diagnostics: std::vec::Vec<String>,
58}
59
60impl From<swc_core::base::TransformOutput> for TransformOutput {
61    fn from(other: swc_core::base::TransformOutput) -> Self {
62        Self {
63            code: other.code,
64            map: other.map,
65            output: other.output,
66            diagnostics: other.diagnostics,
67        }
68    }
69}
70
71#[napi]
72impl Task for MinifyTask {
73    type Output = TransformOutput;
74
75    type JsValue = TransformOutput;
76
77    fn compute(&mut self) -> napi::Result<Self::Output> {
78        let code = self.code.take().unwrap_or_default();
79
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.c.cm.new_source_file(FileName::Anon.into(), code);
89
90                    self.c.minify(fm, handler, &self.opts, Default::default())
91                })
92            },
93        )
94        .map(TransformOutput::from)
95        .map_err(|e| e.to_pretty_error())
96        .convert_err()
97    }
98
99    fn resolve(&mut self, _: napi::Env, output: Self::Output) -> napi::Result<Self::JsValue> {
100        Ok(output)
101    }
102}
103
104#[napi]
105pub fn minify(
106    input: Buffer,
107    opts: Buffer,
108    signal: Option<AbortSignal>,
109) -> napi::Result<AsyncTask<MinifyTask>> {
110    let code = String::from_utf8(input.into())
111        .context("failed to convert input to string")
112        .convert_err()?;
113    let opts = serde_json::from_slice(&opts)?;
114
115    let c = get_compiler();
116
117    let task = MinifyTask {
118        c,
119        code: Some(code),
120        opts,
121    };
122
123    Ok(AsyncTask::with_optional_signal(task, signal))
124}
125
126#[napi]
127pub fn minify_sync(input: Buffer, opts: Buffer) -> napi::Result<TransformOutput> {
128    let code = String::from_utf8(input.into())
129        .context("failed to convert input to string")
130        .convert_err()?;
131    let opts = serde_json::from_slice(&opts)?;
132
133    let c = get_compiler();
134
135    let fm = c.cm.new_source_file(FileName::Anon.into(), code);
136
137    try_with_handler(
138        c.cm.clone(),
139        swc_core::base::HandlerOpts {
140            color: ColorConfig::Never,
141            skip_filename: true,
142        },
143        |handler| {
144            GLOBALS.set(&Default::default(), || {
145                c.minify(fm, handler, &opts, Default::default())
146            })
147        },
148    )
149    .map(TransformOutput::from)
150    .map_err(|e| e.to_pretty_error())
151    .convert_err()
152}
next_swc_napi/minify.rs

next_swc_napi/
minify.rs
