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exec.rs
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#![deny(warnings)]
extern crate swc_malloc;
use ansi_term::Color;
use anyhow::Error;
use serde::Deserialize;
use swc_common::{
comments::SingleThreadedComments,
errors::{Handler, HANDLER},
sync::Lrc,
FileName, Mark, SourceMap,
};
use swc_ecma_ast::Module;
use swc_ecma_codegen::{
text_writer::{omit_trailing_semi, JsWriter, WriteJs},
Emitter,
};
use swc_ecma_minifier::{
optimize,
option::{
terser::TerserCompressorOptions, CompressOptions, ExtraOptions, MangleOptions,
MinifyOptions,
},
};
use swc_ecma_parser::{parse_file_as_module, EsConfig, Syntax};
use swc_ecma_testing::{exec_node_js, JsExecOptions};
use swc_ecma_transforms_base::{fixer::fixer, hygiene::hygiene, resolver};
use swc_ecma_visit::{FoldWith, VisitMutWith};
use testing::DebugUsingDisplay;
use tracing::{info, span, Level};
#[derive(Debug, Clone, Deserialize)]
struct TestOptions {
#[serde(default)]
defaults: bool,
}
fn parse_compressor_config(cm: Lrc<SourceMap>, s: &str) -> (bool, CompressOptions) {
let opts: TestOptions =
serde_json::from_str(s).expect("failed to deserialize value into a compressor config");
let mut c: TerserCompressorOptions =
serde_json::from_str(s).expect("failed to deserialize value into a compressor config");
c.defaults = opts.defaults;
(c.module, c.into_config(cm))
}
fn stdout_of(code: &str) -> Result<String, Error> {
let stdout = exec_node_js(
code,
JsExecOptions {
cache: true,
module: false,
..Default::default()
},
)?;
info!("Stdout: {}", stdout);
Ok(stdout)
}
fn print<N: swc_ecma_codegen::Node>(
cm: Lrc<SourceMap>,
nodes: &[N],
minify: bool,
skip_semi: bool,
) -> String {
let mut buf = vec![];
{
let mut wr: Box<dyn WriteJs> = Box::new(JsWriter::new(cm.clone(), "\n", &mut buf, None));
if minify || skip_semi {
wr = Box::new(omit_trailing_semi(wr));
}
let mut emitter = Emitter {
cfg: swc_ecma_codegen::Config::default().with_minify(minify),
cm,
comments: None,
wr,
};
for n in nodes {
n.emit_with(&mut emitter).unwrap();
}
}
String::from_utf8(buf).unwrap()
}
fn run(
cm: Lrc<SourceMap>,
handler: &Handler,
input: &str,
config: Option<&str>,
mangle: Option<MangleOptions>,
) -> Option<Module> {
let _ = rayon::ThreadPoolBuilder::new()
.thread_name(|i| format!("rayon-{}", i + 1))
.build_global();
let compress_config = config.map(|config| parse_compressor_config(cm.clone(), config).1);
let fm = cm.new_source_file(FileName::Anon, input.into());
let comments = SingleThreadedComments::default();
eprintln!("---- {} -----\n{}", Color::Green.paint("Input"), fm.src);
let unresolved_mark = Mark::new();
let top_level_mark = Mark::new();
let program = parse_file_as_module(
&fm,
Syntax::Es(EsConfig {
jsx: true,
..Default::default()
}),
Default::default(),
Some(&comments),
&mut vec![],
)
.map_err(|err| {
err.into_diagnostic(handler).emit();
})
.map(|module| module.fold_with(&mut resolver(unresolved_mark, top_level_mark, false)));
// Ignore parser errors.
//
// This is typically related to strict mode caused by module context.
let program = match program {
Ok(v) => v,
_ => return None,
};
let run_hygiene = mangle.is_none();
let mut output = optimize(
program.into(),
cm,
Some(&comments),
None,
&MinifyOptions {
compress: compress_config,
mangle,
..Default::default()
},
&ExtraOptions {
unresolved_mark,
top_level_mark,
},
)
.expect_module();
if run_hygiene {
output.visit_mut_with(&mut hygiene());
}
let output = output.fold_with(&mut fixer(None));
Some(output)
}
fn run_exec_test(input_src: &str, config: &str, skip_mangle: bool) {
eprintln!("---- {} -----\n{}", Color::Green.paint("Config"), config);
let expected_output = stdout_of(input_src).unwrap();
eprintln!(
"---- {} -----\n{}",
Color::Green.paint("Expected"),
expected_output
);
testing::run_test2(false, |cm, handler| {
HANDLER.set(&handler, || {
let _tracing = span!(Level::ERROR, "compress-only").entered();
let output = run(cm.clone(), &handler, input_src, Some(config), None);
let output = output.expect("Parsing in base test should not fail");
let output = print(cm, &[output], false, false);
eprintln!(
"---- {} -----\n{}",
Color::Green.paint("Optimized code"),
output
);
let actual_output = stdout_of(&output).expect("failed to execute the optimized code");
assert_ne!(actual_output, "");
assert_eq!(
DebugUsingDisplay(&actual_output),
DebugUsingDisplay(&expected_output)
);
Ok(())
})
})
.unwrap();
if !skip_mangle {
testing::run_test2(false, |cm, handler| {
let _tracing = span!(Level::ERROR, "with-mangle").entered();
let output = run(
cm.clone(),
&handler,
input_src,
None,
Some(MangleOptions {
keep_fn_names: true,
top_level: Some(true),
..Default::default()
}),
);
let output = output.expect("Parsing in base test should not fail");
let output = print(cm, &[&output], true, false);
eprintln!(
"---- {} -----\n{}",
Color::Green.paint("Optimized code"),
output
);
let actual_output = stdout_of(&output).expect("failed to execute the optimized code");
assert_ne!(actual_output, "");
assert_eq!(
DebugUsingDisplay(&actual_output),
DebugUsingDisplay(&expected_output)
);
Ok(())
})
.unwrap();
}
}
fn run_default_exec_test(input_src: &str) {
let config = r#"{
"defaults": true,
"toplevel": true
}"#;
run_exec_test(input_src, config, false);
}
#[test]
fn next_feedback_1_capture_1() {
let src = r###"
const arr = [];
const fns = [];
var _loop = function (i) {
fns.push(() => {
arr.push(i);
})
}
for (var i = 0; i < 10; i++) _loop(i);
fns.forEach(fn => fn());
console.log(arr);"###;
let config = r#"{
"defaults": true,
"toplevel": true
}"#;
run_exec_test(src, config, false);
}
#[test]
fn conditionals_reduce_6() {
let src = r#"function x() {
}
function y() {
return "foo";
}
console.log((y() || false) && x());"#;
let config = r#"{
"booleans": true,
"conditionals": true,
"evaluate": true,
"side_effects": true
}"#;
run_exec_test(src, config, false);
}
#[test]
fn conditionals_reduce_1() {
let src = r#"function x() {
}
function y() {
return "foo";
}
console.log(x() && true && y());"#;
let config = r#"{
"booleans": true,
"conditionals": true,
"evaluate": true,
"side_effects": true
}"#;
run_exec_test(src, config, false);
}
#[test]
fn conditionals_reduce_4() {
let src = r#"function x() {
}
function y() {
return "foo";
}
console.log(y() || false || x());"#;
let config = r#"{
"booleans": true,
"conditionals": true,
"evaluate": true,
"side_effects": true
}"#;
run_exec_test(src, config, false);
}
#[test]
fn conditionals_reduce_3() {
let src = r#"function x() {
}
function y() {
return "foo";
}
console.log(x() || false || y());"#;
let config = r#"{
"booleans": true,
"conditionals": true,
"evaluate": true,
"side_effects": true
}"#;
run_exec_test(src, config, false);
}
#[test]
fn conditionals_reduce_2() {
let src = r#"function x() {
}
function y() {
return "foo";
}
console.log(y() && true && x());"#;
let config = r#"{
"booleans": true,
"conditionals": true,
"evaluate": true,
"side_effects": true
}"#;
run_exec_test(src, config, false);
}
#[test]
fn conditionals_reduce_5() {
let src = r#"function x() {
}
function y() {
return "foo";
}
console.log((x() || false) && y());"#;
let config = r#"{
"booleans": true,
"conditionals": true,
"evaluate": true,
"side_effects": true
}"#;
run_exec_test(src, config, false);
}
#[test]
fn vercel_001() {
let src = r#"function _interop_require_default(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
function _class_call_check(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
function _possible_constructor_return(self, call) { if (!self) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return call && (typeof call === "object" || typeof call === "function") ? call : self; }
function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function, not " + typeof superClass); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, enumerable: false, writable: true, configurable: true } }); if (superClass) Object.setPrototypeOf ? Object.setPrototypeOf(subClass, superClass) : subClass.__proto__ = superClass; }
function ItemsList() {
var _ref;
var _temp, _this, _ret;
_class_call_check(this, ItemsList);
for (var _len = arguments.length, args = Array(_len), _key = 0; _key < _len; _key++) {
args[_key] = arguments[_key];
}
return _ret = (_temp = (_this = _possible_constructor_return(this, (_ref = ItemsList.__proto__ || Object.getPrototypeOf(ItemsList)).call.apply(_ref, [this].concat(args))), _this), _this.storeHighlightedItemReference = function (highlightedItem) {
_this.props.onHighlightedItemChange(highlightedItem === null ? null : highlightedItem.item);
}, _temp), _possible_constructor_return(_this, _ret);
}
new ItemsList();
console.log('PASS')"#;
let config = r#"{
"defaults": true,
"toplevel": true
}"#;
run_exec_test(src, config, false);
}
#[test]
fn vercel_002() {
let src = r#"function _interop_require_default(obj) {
return obj && obj.__esModule ? obj : {
default: obj
};
}
function _class_call_check(instance, Constructor) {
if (!(instance instanceof Constructor)) {
throw new TypeError("Cannot call a class as a function");
}
}
function _possible_constructor_return(self, call) {
if (!self) {
throw new ReferenceError("this hasn't been initialised - super() hasn't been called");
}
return call && ("object" == typeof call || "function" == typeof call) ? call : self;
}
function _inherits(subClass, superClass) {
if ("function" != typeof superClass && null !== superClass) {
throw new TypeError("Super expression must either be null or a function, not " + typeof superClass);
}
subClass.prototype = Object.create(superClass && superClass.prototype, {
constructor: {
value: subClass,
enumerable: false,
writable: true,
configurable: true
}
});
if (superClass) Object.setPrototypeOf ? Object.setPrototypeOf(subClass, superClass) : subClass.__proto__ = superClass;
}
function ItemsList() {
_class_call_check(this, ItemsList);
for (var _ref, _temp, _this, _ret, _len = arguments.length, args = Array(_len), _key = 0; _key < _len; _key++) {
args[_key] = arguments[_key];
}
return _ret = (_temp = (_this = _possible_constructor_return(this, (_ref = ItemsList.__proto__ || Object.getPrototypeOf(ItemsList)).call.apply(_ref, [
this
].concat(args))), _this), _this.storeHighlightedItemReference = function (highlightedItem) {
_this.props.onHighlightedItemChange(null === highlightedItem ? null : highlightedItem.item);
}, _temp), _possible_constructor_return(_this, _ret);
}
new ItemsList();
console.log("PASS");"#;
let config = r#"{
"defaults": true,
"toplevel": true
}"#;
run_exec_test(src, config, false);
}
#[test]
fn regexp_1() {
let src = r#"
function compile(attributePattern, flags) {
return new RegExp(`(?:^|;)\\s*${attributePattern}\\s*=\\s*` + `(` + `[^";\\s][^;\\s]*` + `|` + `"(?:[^"\\\\]|\\\\"?)+"?` + `)`, flags);
}
console.log(compile("foo", "g"));
console.log(compile("bar", "g"));
console.log(compile("baz", "g"));"#;
let config = r#"{
"defaults": true
}"#;
run_exec_test(src, config, false);
}
#[test]
fn update_object_1() {
let src = r###"console.log(function () {
console.log({
q: {
p: 8
}
}.q.p++);
return 8;
}());"###;
let config = r###"{}"###;
run_exec_test(src, config, false);
}
#[test]
fn update_object_3() {
let src = r###"console.log(function () {
var o = {
p: 7
};
console.log([
o
][0].p++);
return o.p;
}());"###;
let config = r###"{}"###;
run_exec_test(src, config, false);
}
#[test]
fn update_object_2() {
let src = r###"function inc() {
this.p++;
}
console.log(function () {
inc.call({
p: 6
});
console.log(6);
return 6;
}());"###;
let config = r###"{}"###;
run_exec_test(src, config, false);
}
#[test]
fn iife_reassign_1() {
let src = r###"console.log(function c() {
c = 6;
return c;
}())"###;
let config = r#"{
"evaluate": true,
"inline": true,
"passes": 3,
"reduce_vars": true,
"side_effects": true,
"unused": true
}"#;
run_exec_test(src, config, false);
}
#[test]
fn emotion_react_1() {
let src = r#"
/* harmony default export */
var emotion_memoize_browser_esm = (memoize);
var hyphenateRegex = /[A-Z]|^ms/g;
var animationRegex = /_EMO_([^_]+?)_([^]*?)_EMO_/g;
var unitlessKeys = {
animationIterationCount: 1,
borderImageOutset: 1,
borderImageSlice: 1,
borderImageWidth: 1,
boxFlex: 1,
boxFlexGroup: 1,
boxOrdinalGroup: 1,
columnCount: 1,
columns: 1,
flex: 1,
flexGrow: 1,
flexPositive: 1,
flexShrink: 1,
flexNegative: 1,
flexOrder: 1,
gridRow: 1,
gridRowEnd: 1,
gridRowSpan: 1,
gridRowStart: 1,
gridColumn: 1,
gridColumnEnd: 1,
gridColumnSpan: 1,
gridColumnStart: 1,
msGridRow: 1,
msGridRowSpan: 1,
msGridColumn: 1,
msGridColumnSpan: 1,
fontWeight: 1,
lineHeight: 1,
opacity: 1,
order: 1,
orphans: 1,
tabSize: 1,
widows: 1,
zIndex: 1,
zoom: 1,
WebkitLineClamp: 1,
// SVG-related properties
fillOpacity: 1,
floodOpacity: 1,
stopOpacity: 1,
strokeDasharray: 1,
strokeDashoffset: 1,
strokeMiterlimit: 1,
strokeOpacity: 1,
strokeWidth: 1
};
var unitless_browser_esm = (unitlessKeys);
var isCustomProperty = function isCustomProperty(property) {
return property.charCodeAt(1) === 45;
};
var labelPattern = /label:\s*([^\s;\n{]+)\s*(;|$)/g;
var cursor;
var hash_browser_esm = (murmur2);
function handleInterpolation(mergedProps, registered, interpolation) {
if (interpolation == null) {
return '';
}
if (interpolation.__emotion_styles !== undefined) {
if (false) { }
return interpolation;
}
switch (typeof interpolation) {
case 'boolean': {
return '';
}
case 'object': {
if (interpolation.anim === 1) {
cursor = {
name: interpolation.name,
styles: interpolation.styles,
next: cursor
};
return interpolation.name;
}
if (interpolation.styles !== undefined) {
var next = interpolation.next;
if (next !== undefined) {
// not the most efficient thing ever but this is a pretty rare case
// and there will be very few iterations of this generally
while (next !== undefined) {
cursor = {
name: next.name,
styles: next.styles,
next: cursor
};
next = next.next;
}
}
var styles = interpolation.styles + ";";
if (false) { }
return styles;
}
return createStringFromObject(mergedProps, registered, interpolation);
}
case 'function': {
if (mergedProps !== undefined) {
var previousCursor = cursor;
var result = interpolation(mergedProps);
cursor = previousCursor;
return handleInterpolation(mergedProps, registered, result);
} else if (false) { }
break;
}
case 'string':
if (false) {
var replaced, matched;
}
break;
} // finalize string values (regular strings and functions interpolated into css calls)
if (registered == null) {
return interpolation;
}
var cached = registered[interpolation];
return cached !== undefined ? cached : interpolation;
}
function serializeStyles(args, registered, mergedProps) {
if (args.length === 1 && typeof args[0] === 'object' && args[0] !== null && args[0].styles !== undefined) {
return args[0];
}
var stringMode = true;
var styles = '';
cursor = undefined;
var strings = args[0];
if (strings == null || strings.raw === undefined) {
stringMode = false;
console.log('stringMode = false')
styles += handleInterpolation(mergedProps, registered, strings);
} else {
if (false) { }
styles += strings[0];
} // we start at 1 since we've already handled the first arg
console.log(`Styles: ${styles}`)
for (var i = 1; i < args.length; i++) {
styles += handleInterpolation(mergedProps, registered, args[i]);
if (stringMode) {
if (false) { }
styles += strings[i];
}
}
console.log(`Styles: ${styles}`)
var sourceMap;
if (false) { } // using a global regex with .exec is stateful so lastIndex has to be reset each time
labelPattern.lastIndex = 0;
var identifierName = '';
var match; // https://esbench.com/bench/5b809c2cf2949800a0f61fb5
while ((match = labelPattern.exec(styles)) !== null) {
identifierName += '-' + // $FlowFixMe we know it's not null
match[1];
}
console.log(`styles = ${styles}`)
console.log(`identifierName = ${identifierName}`)
var name = hash_browser_esm(styles) + identifierName;
if (false) { }
return {
name: name,
styles: styles,
next: cursor
};
}
function createStringFromObject(mergedProps, registered, obj) {
var string = '';
if (Array.isArray(obj)) {
for (var i = 0; i < obj.length; i++) {
string += handleInterpolation(mergedProps, registered, obj[i]) + ";";
}
} else {
for (var _key in obj) {
var value = obj[_key];
if (typeof value !== 'object') {
if (registered != null && registered[value] !== undefined) {
string += _key + "{" + registered[value] + "}";
} else if (isProcessableValue(value)) {
string += processStyleName(_key) + ":" + processStyleValue(_key, value) + ";";
}
} else {
if (_key === 'NO_COMPONENT_SELECTOR' && "production" !== 'production') { }
if (Array.isArray(value) && typeof value[0] === 'string' && (registered == null || registered[value[0]] === undefined)) {
for (var _i = 0; _i < value.length; _i++) {
if (isProcessableValue(value[_i])) {
string += processStyleName(_key) + ":" + processStyleValue(_key, value[_i]) + ";";
}
}
} else {
var interpolated = handleInterpolation(mergedProps, registered, value);
switch (_key) {
case 'animation':
case 'animationName': {
string += processStyleName(_key) + ":" + interpolated + ";";
break;
}
default: {
if (false) { }
string += _key + "{" + interpolated + "}";
}
}
}
}
}
}
return string;
}
function murmur2(str) {
// 'm' and 'r' are mixing constants generated offline.
// They're not really 'magic', they just happen to work well.
// const m = 0x5bd1e995;
// const r = 24;
// Initialize the hash
var h = 0; // Mix 4 bytes at a time into the hash
var k,
i = 0,
len = str.length;
for (; len >= 4; ++i, len -= 4) {
k = str.charCodeAt(i) & 0xff | (str.charCodeAt(++i) & 0xff) << 8 | (str.charCodeAt(++i) & 0xff) << 16 | (str.charCodeAt(++i) & 0xff) << 24;
console.log(`K1: ${k}`);
k =
/* Math.imul(k, m): */
(k & 0xffff) * 0x5bd1e995 + ((k >>> 16) * 0xe995 << 16);
console.log(`K2: ${k}`);
k ^=
/* k >>> r: */
k >>> 24;
console.log(`K3: ${k}`);
h =
/* Math.imul(k, m): */
(k & 0xffff) * 0x5bd1e995 + ((k >>> 16) * 0xe995 << 16) ^
/* Math.imul(h, m): */
(h & 0xffff) * 0x5bd1e995 + ((h >>> 16) * 0xe995 << 16);
console.log(`H: ${h}`);
} // Handle the last few bytes of the input array
switch (len) {
case 3:
h ^= (str.charCodeAt(i + 2) & 0xff) << 16;
case 2:
h ^= (str.charCodeAt(i + 1) & 0xff) << 8;
case 1:
h ^= str.charCodeAt(i) & 0xff;
h =
/* Math.imul(h, m): */
(h & 0xffff) * 0x5bd1e995 + ((h >>> 16) * 0xe995 << 16);
} // Do a few final mixes of the hash to ensure the last few
// bytes are well-incorporated.
h ^= h >>> 13;
h =
/* Math.imul(h, m): */
(h & 0xffff) * 0x5bd1e995 + ((h >>> 16) * 0xe995 << 16);
return ((h ^ h >>> 15) >>> 0).toString(36);
}
function isProcessableValue(value) {
return value != null && typeof value !== 'boolean';
}
var processStyleName = /* #__PURE__ */ emotion_memoize_browser_esm(function (styleName) {
return isCustomProperty(styleName) ? styleName : styleName.replace(hyphenateRegex, '-$&').toLowerCase();
});
var processStyleValue = function processStyleValue(key, value) {
switch (key) {
case 'animation':
case 'animationName': {
if (typeof value === 'string') {
return value.replace(animationRegex, function (match, p1, p2) {
cursor = {
name: p1,
styles: p2,
next: cursor
};
return p1;
});
}
}
}
if (unitless_browser_esm[key] !== 1 && !isCustomProperty(key) && typeof value === 'number' && value !== 0) {
return value + 'px';
}
return value;
};
function memoize(fn) {
var cache = Object.create(null);
return function (arg) {
if (cache[arg] === undefined) cache[arg] = fn(arg);
return cache[arg];
};
}
console.log(serializeStyles(`:root {
--background-color: rebeccapurple;
}`));
console.log(serializeStyles(`:root {
--background-color: rebeccapurple;
}`));
console.log(serializeStyles(`:root {
--background-color: rebeccapurple;
}`));
console.log(serializeStyles(`:root {
--background-color: rebeccapurple;
}`));
console.log(serializeStyles(`:root {
--background-color: rebeccapurple;
}`));
console.log(serializeStyles(`:root {
--background-color: rebeccapurple;
}`));"#;
let config = r#"{
"defaults": true,
"toplevel": true
}"#;
run_exec_test(src, config, false);
}
#[test]
fn simple_1() {
let src = r###"console.log('PASS')"###;
let config = r###"{}"###;
run_exec_test(src, config, false);
}
#[test]
fn terser_issue_1588_unsafe_undefined() {
let src = r###"var a, c;
console.log(
(function (undefined) {
return function () {
if (a) return b;
if (c) return d;
};
})()()
);"###;
let config = r#"{
"conditionals": true,
"if_return": true,
"unsafe_undefined": true
}"#;
run_exec_test(src, config, false);
}
#[test]
fn terser_issue_1588_safe_undefined() {
let src = r###"var a, c;
console.log(
(function (undefined) {
return function () {
if (a) return b;
if (c) return d;
};
})(1)()
);"###;
let config = r#"{
"conditionals": true,
"if_return": true,
"unsafe": false
}"#;
run_exec_test(src, config, false);
}
#[test]
fn terser_drop_unused_drop_toplevel_retain() {
let src = r###"var a,
b = 1,
c = g;
function f(d) {
return function () {
c = 2;