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1058 lines (1021 loc) · 51.1 KB
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package js
import (
"bytes"
"fmt"
"os"
"runtime"
"testing"
"github.com/tdewolff/minify/v2"
"github.com/tdewolff/parse/v2"
"github.com/tdewolff/parse/v2/buffer"
"github.com/tdewolff/test"
)
func TestJS(t *testing.T) {
jsTests := []struct {
js string
expected string
}{
{`#!shebang`, `#!shebang`},
{`/*comment*/a`, `a`},
{`/*!comment*/a`, `/*!comment*/a`},
{"//!comment1\n\n//!comment2\na", "//!comment1\n//!comment2\na"},
{`debugger`, `debugger`},
{`"use strict"`, `"use strict"`},
{`1.0`, `1`},
{`1_2.0_3`, `12.03`},
{`1000`, `1e3`},
{`1e10`, `1e10`},
{`1e-10`, `1e-10`},
{`5_000`, `5e3`},
{`5_000n`, `5000n`},
{`0b1001`, `9`},
{`0b10_01`, `9`},
{`0b10_01n`, `9n`},
{`0o11`, `9`},
{`0o11n`, `9n`},
{`0x0D`, `13`},
{`0x0d`, `13`},
{`0x0dn`, `13n`},
{`0x53DCAA254718n`, `0x53DCAA254718n`},
//{`123456787654321`, `0x704885f926b1`},
//{`4294967295`, `0xFFFFFFFF`}, // better GZIP
{`+ +x`, `+ +x`},
{`- -x`, `- -x`},
{`- +x`, `-+x`},
{`+ ++x`, `+ ++x`},
{`- --x`, `- --x`},
{`- ++x`, `-++x`},
{`a + ++b`, `a+ ++b`},
{`a - --b`, `a- --b`},
{`a++ +b`, `a+++b`},
{`a-- -b`, `a---b`},
{`a - ++b`, `a-++b`},
{`a-- > b`, `a-- >b`},
{`(a--) > b`, `a-- >b`},
{`a-- < b`, `a--<b`},
{`a < !--b`, `a<! --b`},
{`a > !--b`, `a>!--b`},
{`!--b`, `!--b`},
{`/a/ + b`, `/a/+b`},
{`/a/ instanceof b`, `/a/ instanceof b`},
{`[a] instanceof b`, `[a]instanceof b`},
{`let a = 5;a`, `let a=5;a`},
{`let a = 5,b;a,b`, `let a=5,b;a,b`},
{`let a,b = 5;a,b`, `let a,b=5;a,b`},
{`function a(){}`, `function a(){}`},
{`function a(b){b}`, `function a(b){b}`},
{`function a(b, c, ...d){}`, `function a(b,c,...d){}`},
{`function * a(){}`, `function*a(){}`},
{`function a(){}; break`, `function a(){}break`},
{`x = function (){}`, `x=function(){}`},
{`x = function a(){}`, `x=function(){}`},
{`x = function (a){a}`, `x=function(a){a}`},
{`x = function (a, b, ...c){}`, `x=function(a,b,...c){}`},
{`x = function (){};y=z`, `x=function(){},y=z`},
{`function f(){return 5}`, `function f(){return 5}`},
{`function f(){return .5}`, `function f(){return.5}`},
{`function f(){return-5}`, `function f(){return-5}`},
{`break a`, `break a`},
{`continue a`, `continue a`},
{`label: b`, `label:b`},
{`typeof a`, `typeof a`},
{`new RegExp()`, `new RegExp`},
{`switch (a) { case b: 5; default: 6}`, `switch(a){case b:5;default:6}`},
{`switch (a) { case b: {var c;c;break}; default: 6}`, `switch(a){case b:{var c;c;break}default:6}`},
{`switch (a) { case b: 5 }while(b);`, `switch(a){case b:5}for(;b;);`},
{`switch (a) { case "text": 5}`, `switch(a){case"text":5}`},
{`let a=5;switch(b){case 0:let a=5}`, `let a=5;switch(b){case 0:let a=5}`},
{`with (a = b) x`, `with(a=b)x`},
{`with (a = b) {x}`, `with(a=b)x`},
{`import "path"`, `import"path"`},
{`import x from "path"`, `import x from"path"`},
{`import * as b from "path"`, `import*as b from"path"`},
{`import {} from "path"`, ``},
{`import {a as b} from "path"`, `import{a as b}from"path"`},
{`import {a as b, c} from "path"`, `import{a as b,c}from"path"`},
{`import x, * as b from "path"`, `import x,*as b from"path"`},
{`import x, {a as b, c} from "path"`, `import x,{a as b,c}from"path"`},
{`export * from "path"`, `export*from"path"`},
{`export * as ns from "path"`, `export*as ns from"path"`},
{`export {a as b} from "path"`, `export{a as b}from"path"`},
{`export {a as b, c} from "path"`, `export{a as b,c}from"path"`},
{`export {a as b, c}`, `export{a as b,c}`},
{`export var a = b`, `export var a=b`},
{`export function a(){}`, `export function a(){}`},
{`export default a = b`, `export default a=b`},
{`export default a = b;c=d`, `export default a=b;c=d`},
{`export default function a(){};c=d`, `export default function(){}c=d`},
{`!class {}`, `!class{}`},
{`class a {}`, `class a{}`},
{`class a extends b {}`, `class a extends b{}`},
{`class a extends(!b){}`, `class a extends(!b){}`},
{`class a { f(a) {a} }`, `class a{f(a){a}}`},
{`class a { f(a) {a}; static g(b) {b} }`, `class a{f(a){a}static g(b){b}}`},
{`class a { static }`, `class a{static}`},
{`class a { static b }`, `class a{static b}`},
{`class a { f(c){c} }`, `class a{f(c){c}}`},
{`class a { static #d=5 }`, `class a{static#d=5}`},
{`class a { static { b = this.f(5) } }`, `class a{static{b=this.f(5)}}`},
{`class a { #a(){} }`, `class a{#a(){}}`},
{`class a { #b = 1; #c() {} }`, `class a{#b=1;#c(){}}`},
{`for (var a = 5; a < 10; a++){a}`, `for(var a=5;a<10;a++)a`},
{`for (a,b = 5; a < 10; a++){a}`, `for(a,b=5;a<10;a++)a`},
{`async function f(){for await (var a of b){a}}`, `async function f(){for await(var a of b)a}`},
{`for (var a in b){a}`, `for(var a in b)a`},
{`for (a in b){a}`, `for(a in b)a`},
{`for (var a of b){a}`, `for(var a of b)a`},
{`for (a of b){a}`, `for(a of b)a`},
{`for (;;){let a;a}`, `for(;;){let a;a}`},
{`var a;for(var b;;){let a;a++}a,b`, `for(var a,b;;){let a;a++}a,b`},
{`var a;for(var b;;){let c = 10;c++}a,b`, `for(var a,b;;){let c=10;c++}a,b`},
{`while(a < 10){a}`, `for(;a<10;)a`},
{`while(a < 10){a;b}`, `for(;a<10;)a,b`},
{`while(a < 10){while(b);c}`, `for(;a<10;){for(;b;);c}`},
//{`while(a) if (!b) break`, `for(;a&&b;);`},
{`do {a} while(a < 10)`, `do a;while(a<10)`},
{`do [a]=5; while(a < 10)`, `do[a]=5;while(a<10)`},
{`do [a]=5; while(a < 10);break`, `do[a]=5;while(a<10)break`},
{`throw a`, `throw a`},
{`throw [a]`, `throw[a]`},
{`try {a} catch {b}`, `try{a}catch{b}`},
{`try {a} catch(b) {b}`, `try{a}catch(b){b}`},
{`try {a} catch(b) {b} finally {c}`, `try{a}catch(b){b}finally{c}`},
{`try {a} finally {c}`, `try{a}finally{c}`},
{`try {a} catch(b) {c}`, `try{a}catch{c}`},
{`a=b;c=d`, `a=b,c=d`},
// strings
{`""`, `""`},
{`"\x7"`, `"\x7"`},
{`"string\'string"`, `"string'string"`},
{`'string\"string'`, `'string"string'`},
{`"string\t\f\v\bstring"`, "\"string\t\f\v\bstring\""},
{`"string\a\c\'string"`, `"stringac'string"`},
{`"string\∀string"`, `"string∀string"`},
{`"string\0\uFFFFstring"`, "\"string\\0\uffffstring\""},
{`"string\x00\x55\x0A\x0D\x22\x27string"`, "`string\\x00U\n\\r\"'string`"},
{`"string\000\12\015\042\47\411string"`, "`string\\0\n\\r\"'!1string`"},
{`"\x005"`, `"\x005"`},
{"`\\r`", "`\\r`"},
{"'string\\n\\rstring'", "`string\n\\rstring`"},
{"'string\\\r\nstring\\\nstring\\\rstring\\\u2028string\\\u2029string'", `"stringstringstringstringstringstring"`},
{`"\x7H\u877H"`, `"\x7H\u877H"`},
{`"\u01ac\u01de\u0187\u{0001a0}"`, `"ƬǞƇƠ"`},
{`"str1ng" + "str2ng"`, `"str1ngstr2ng"`},
{`"str1ng" + "str2ng" + "str3ng"`, `"str1ngstr2ngstr3ng"`},
{`"padding" + this`, `"padding"+this`},
{`"<\/script>"`, `"<\/script>"`},
{`"</scr"+"ipt>"`, `"<\/script>"`},
{`"\""`, `'"'`},
{`'\'""'`, "`'\"\"`"},
{`"\"\"a'"`, "`\"\"a'`"},
{`"'" + '"'`, "`'\"`"},
{`'"' + "'"`, "`\"'`"},
{"`\\n\\'\\$\\$\\{`", "`\n'$\\${`"},
{`"a"+"b"+5`, `"ab"+5`},
{`5+"a"+"b"`, `5+"ab"`},
{`"a"+"b"+5+"c"+"d"`, `"ab"+5+"cd"`},
{`"a"+"b"+5+6+"d"`, `"ab"+5+6+"d"`},
{"`$${foo}`", "`$${foo}`"},
{"'\\n\\nCheck the render method of `'", "`\n\nCheck the render method of \\``"},
// rename true, false, undefined, Infinity
{`x=true`, `x=!0`},
{`x=false`, `x=!1`},
{`x=false()`, `x=(!1)()`},
{`false`, `!1`},
{`x=void 0`, `x=0[0]`},
{`x=undefined`, `x=0[0]`},
{`x=undefined()`, `x=0[0]()`},
{`x=undefined.a`, `x=0[0].a`},
{`{const undefined=5;x=undefined}`, `{const undefined=5;x=undefined}`},
{`x=Infinity`, `x=1/0`},
{`x=Infinity()`, `x=(1/0)()`},
{`x=2**Infinity`, `x=2**(1/0)`},
{`{const Infinity=5;x=Infinity}`, `{const Infinity=5;x=Infinity}`},
{`!""`, `!0`},
{`!"foobar"`, `!1`},
{`class a extends undefined {}`, `class a extends 0[0]{}`},
{`new true`, `new(!0)`},
{`function*a(){yield undefined}`, `function*a(){yield}`},
{`function*a(){let undefined;yield undefined}`, `function*a(){let undefined;yield undefined}`},
{`function*a(){yield*undefined}`, `function*a(){yield*0[0]}`},
// if/else statements
{`function f(){if(a){return b}}`, `function f(){if(a)return b}`},
{`function f(){if(a){b = 5;return b}}`, `function f(){if(a)return b=5,b}`},
{`if(a)`, `a`},
{`if(a){}`, `a`},
{`if(a) a`, `a&&a`},
{`if(a) b`, `a&&b`},
{`if(a,b) c`, `a,b&&c`},
{`if(a){}else;`, `a`},
{`if(a){}else{}`, `a`},
{`if(a){}else{;}`, `a`},
{`if(a){}else{b}`, `a||b`},
{`if(a)a;else b`, `a||b`},
{`if(a)b;else b`, `a,b`},
{`if(a){b=c}else if(d){e=f}`, `a?b=c:d&&(e=f)`},
{`if(a){b=c;y=z}else if(d){e=f}`, `a?(b=c,y=z):d&&(e=f)`},
{`if(a)while(b){c;d}else e`, `if(a)for(;b;)c,d;else e`},
{`if(a)while(b){c}else e`, `if(a)for(;b;)c;else e`},
{`if(a){ if(b) c }`, `a&&b&&c`},
{`if(a){ if(b) c } else e`, `a?b&&c:e`},
{`if(a){ if(b) c; else d} else e`, `a?b?c:d:e`},
{`if(a){ if(b) c; else for(x;y;z){f=g}} else e`, `if(a)if(b)c;else for(x;y;z)f=g;else e`},
{`if(a){ if(b) c; else {for(x;y;z){f=g}}} else e`, `if(a)if(b)c;else for(x;y;z)f=g;else e`},
{`if(a)a={b};else e`, `a?a={b}:e`},
{`if(a) a; else [e]=4`, `a?a:[e]=4`},
{`if(a){ a = b?c:function(d){d} } else e`, `a?a=b?c:function(d){d}:e`},
{`if(a)while(b){if(c)d; else e}else f`, `if(a)for(;b;)c?d:e;else f`},
{`if(a)b=c`, `a&&(b=c)`},
{`if(!a)b=c`, `a||(b=c)`},
{`if(a||d)b=c`, `(a||d)&&(b=c)`},
{`if(a);else b=c`, `a||(b=c)`},
{`if(!a);else b=c`, `a&&(b=c)`},
{`if(a)b=c;else e`, `a?b=c:e`},
{`if(a)b=c,f;else e`, `a?(b=c,f):e`},
{`if(a){b=c}else{if(d){e=f}else{g=h}}`, `a?b=c:d?e=f:g=h`},
{`if(a){b=c}else if(d){e=f}else if(g){h=i}`, `a?b=c:d?e=f:g&&(h=i)`},
{`if(a){if(b)c;else d}else{e}`, `a?b?c:d:e`},
{`if(a){if(b)c;else d}else{d}`, `a&&b?c:d`},
{`if(a){if(b)c;else false}else{d}`, `a?!!b&&c:d`},
{`if(a){if(b)c;else d}else{false}`, `!!a&&(b?c:d)`},
{`if(a){if(b)c;else false}else{false}`, `!!a&&!!b&&c`},
{`function f(){if(a)return a;else return b}`, `function f(){return a||b}`},
{`function f(){if(a)return a;else a++}`, `function f(){if(a)return a;a++}`},
{`function f(){if(a)return b;else a++}`, `function f(){if(a)return b;a++}`},
{`if(a)throw b;else a++`, `if(a)throw b;a++`},
{`if(a)break;else a++`, `if(a)break;a++`},
{`function f(){if(a)return;else return}`, `function f(){a}`},
{`if(a)throw a;else throw b`, `throw a||b`},
{`function f(){if(a)return a;else a=b}`, `function f(){if(a)return a;a=b}`},
{`function f(){if(a){a++;return a}else a=b}`, `function f(){if(a)return a++,a;a=b}`},
{`function f(){if(a){a++;return a}else if(b)a=b}`, `function f(){if(a)return a++,a;b&&(a=b)}`},
{`function f(){if(a){a++;return}else a=b}`, `function f(){if(a){a++;return}a=b}`},
//{`function f(){if(a){a++;return}else return}`, `function f(){if(a){a++}return}`}, // TODO
//{`function f(){if(a){a++;return}return}`, `function f(){if(a){a++}return}`}, // TODO
{`function f(){if(a){return}else {a=b;while(c){}}}`, `function f(){if(a)return;for(a=b;c;);}`},
{`function f(){if(a){a++;return a}else return}`, `function f(){if(a)return a++,a}`},
{`function f(){if(a){a++;return a}return}`, `function f(){if(a)return a++,a}`},
{`function f(){if(a){return a}return b}`, `function f(){return a||b}`},
{`function f(){if(a);else return a;return b}`, `function f(){return a&&b}`},
{`function f(){if(a){return a}b=c;return b}`, `function f(){return a||(b=c,b)}`},
{`function f(){if(a){return}b=c;return b}`, `function f(){if(a)return;return b=c,b}`},
{`function f(){if(a){return a}b=c;return}`, `function f(){if(a)return a;b=c}`},
{`function f(){if(a){return}return}`, `function f(){a}`},
{`function f(){if(a);else{return}return}`, `function f(){a}`},
{`if(a){throw a}b=c;throw b`, `throw a||(b=c,b)`},
{`if(a);else{throw a}b=c;throw b`, `throw a&&(b=c,b)`},
{`if(a)a++;else b;if(b)b++;else c`, `a?a++:b,b?b++:c`},
{`if(a){while(b);}`, `if(a)for(;b;);`},
{`if(a){while(b);c}`, `if(a){for(;b;);c}`},
{`if(a){if(b){while(c);}}`, `if(a&&b)for(;c;);`},
{`if(a){}else{while(b);}`, `if(a);else for(;b;);`},
{`function f(){if(a){return b}else{while(c);}}`, `function f(){if(a)return b;for(;c;);}`},
{`function f(){if(a){return b}else{while(c);d}}`, `function f(){if(a)return b;for(;c;);d}`},
{`if(!a){while(b);c}`, `if(!a){for(;b;);c}`},
{`while(a){if(b)continue;if(c)continue;else d}`, `for(;a;){if(b)continue;if(c)continue;d}`},
{`while(a)if(b)continue;else c`, `for(;a;){if(b)continue;c}`},
{`function f(){while(a)if(b)return c;else return d}`, `function f(){for(;a;)return b?c:d}`},
{`while(a){if(b)continue;else c}`, `for(;a;){if(b)continue;c}`},
{`if(a){while(b)if(c)5}else{6}`, `if(a)for(;b;)c&&5;else 6`},
{`if(a){for(;;)if(b)break}else c`, `if(a){for(;;)if(b)break}else c`},
{`if(a){for(d in e)if(b)break}else c`, `if(a){for(d in e)if(b)break}else c`},
{`if(a){for(d of e)if(b)break}else c`, `if(a){for(d of e)if(b)break}else c`},
{`if(a){for(d of e)if(f)g()}else c`, `if(a)for(d of e)f&&g();else c`},
{`if(a){d:if(b)break}else c`, `if(a){d:if(b)break}else c`},
{`if(a){with(d)if(b)break}else c`, `if(a){with(d)if(b)break}else c`},
{`function f(){if(a)return b;if(c)return d;return e}`, `function f(){return a?b:c?d:e}`},
{`if(a,b)b`, `a,b&&b`},
{`if(a,b)b;else d`, `a,b||d`},
{`if(a=b)a;else b`, `(a=b)||b`},
{`function f(){if(!a&&!b){return true}else if(!a||!b){return false}return c&&d}`, `function f(){return!a&&!b||!!a&&!!b&&c&&d}`},
{`function f(){if(!a){if(b){throw c}else{return c}}else{return a}}`, `function f(){if(a)return a;if(b)throw c;return c}`},
{`function f(){if(!a){return y}else if(b){if(c){return x}}return z}`, `function f(){return a?b&&c?x:z:y}`},
{`if(a)b:{if(c)break b}else if(d)e()`, `if(a){b:if(c)break b}else d&&e()`},
// var declarations
{`var a;var b;a,b`, `var a,b;a,b`},
{`const a=1;const b=2;a,b`, `const a=1,b=2;a,b`},
{`let a=1;let b=2;a,b`, `let a=1,b=2;a,b`},
{`var a;if(a)var b;else b`, `var a,b;a||b`},
{`var a;if(a)var b=5;b`, `if(a)var a,b=5;b`}, // TODO: or should we try to take var decls out of statements that will be converted to expressions?
{`var [,,a,,]=b`, `var[,,a]=b`},
{`var [,,a,,...c]=b`, `var[,,a,,...c]=b`},
{`const a=3;for(const b=0;b;b++);a`, `const a=3;for(const b=0;b;b++);a`},
{`var a;for(let b=0;b;b++);a`, `var a;for(let b=0;b;b++);a`},
{`var [a,]=[b,]`, `var[a]=[b]`},
{`var [a,b=5,...c]=[d,e,...f]`, `var[a,b=5,...c]=[d,e,...f]`},
{`var [a,,]=[b,,]`, `var[a]=[b,,]`},
{`var {a,}=b`, `var{a}=b`},
{`var {a:a}=b`, `var{a}=b`},
{`var {a,b=5,...c}={d,e=7,...f}`, `var{a,b=5,...c}={d,e=7,...f}`},
{`var {[a+b]: c}=d`, `var{[a+b]:c}=d`},
{`for(var [a] in b);`, `for(var[a]in b);`},
{`for(var {a} of b);`, `for(var{a}of b);`},
{`for(var a in b);var c`, `for(a in b);var a,c`},
{`for(var a in b);var c=6,d=7`, `for(a in b);var a,c=6,d=7`},
{`for(var a=5,c=6;;);`, `for(var a=5,c=6;;);`},
{`while(a);var b;var c`, `for(var b,c;a;);`},
{`while(a){d()}var b;var c`, `for(var b,c;a;)d()`},
{`var [a,b=5,,...c]=[d,e,...f];var z;z`, `var[a,b=5,,...c]=[d,e,...f],z;z`},
{`var {a,b=5,[5+8]:c,...d}={d,e,...f};var z;z`, `var{a,b=5,[5+8]:c,...d}={d,e,...f},z;z`},
{`var a=5;var b=6;a,b`, `var a=5,b=6;a,b`},
{`var a;var b=6;a=7;b`, `var b=6,a=7;b`}, // swap declaration order to maintain definition order
{`var a=5;var b=6;a=7,b`, `var a=5,b=6,a=7;b`},
{`var a;var b=6;a,b,z=7`, `var a,b=6;a,b,z=7`},
{`for(var a=6,b=7;;);var c=8;a,b,c`, `for(var c,a=6,b=7;;);c=8,a,b,c`},
{`for(var c;b;){let a=8;a};var a;a`, `for(var a,c;b;){let a=8;a}a`},
{`for(;b;){let a=8;a};var a;var b;a`, `for(var a,b;b;){let a=8;a}a`},
{`var a=1,b=2;while(c);var d=3,e=4;a,b,d,e`, `for(var d,e,a=1,b=2;c;);d=3,e=4,a,b,d,e`},
{`var z;var [a,b=5,,...c]=[d,e,...f];z`, `var[a,b=5,,...c]=[d,e,...f],z;z`},
{`var z;var {a,b=5,[5+8]:c,...d}={d,e,...f};z`, `var{a,b=5,[5+8]:c,...d}={d,e,...f},z;z`},
{`var z;z;var [a,b=5,,...c]=[d,e,...f];a`, `z;var[a,b=5,,...c]=[d,e,...f],z;a`},
// TODO
//{`var z;z;var {a,b=5,[5+8]:c,...d}={e,f,...g};a`, `var z,a;z,{a}={e,f,...g},a`},
//{`var z;z;var {a,b=5,[5+8]:c,...d}={e,f,...g};d`, `var z,a,b,c,d;z,{a,b,[5+8]:c,...d}={e,f,...g},d`},
//{`var {a,b=5,[5+8]:c,d:e}=z;b`, `var{b=5}=z;b`},
//{`var {a,b=5,[5+8]:c,d:e,...f}=z;b`, `var{b=5}=z;b`},
{`var {a,b=5,[5+8]:c,d:e,...f}=z;f`, `var{a,b=5,[5+8]:c,d:e,...f}=z;f`},
{`var a;var {}=b;`, `var{}=b,a`},
{`"use strict";var a;var b;b=5`, `"use strict";var a,b=5`},
{`"use strict";z+=6;var a;var b;b=5`, `"use strict";z+=6;var a,b=5`},
{`!function(){"use strict";return a}`, `!function(){"use strict";return a}`},
{`var a;var{b}=c;`, `var{b}=c,a`},
{`var a;var[b]=c;`, `var[b]=c,a`},
{`var a;f();var b=c;`, `f();var a,b=c`},
{`var{a}=x;f();var{b}=c;`, `var{a}=x;f();var{b}=c`},
{`var{a}=x;f();var d,{b}=c;`, `var{a}=x;f();var{b}=c,d`},
{`var{a}=x;f();var[b]=c;`, `var{a}=x,b;f(),[b]=c`},
{`var{a}=x;f();var[b,d]=c;`, `var{a}=x;f();var[b,d]=c`},
{`var{a}=x;f();var[bd]=c;`, `var{a}=x,bd;f(),[bd]=c`},
{`var{a}=x;f();var bc=e;`, `var{a}=x,bc;f(),bc=e`},
{`var{a}=x;f();var bcd=e;`, `var{a}=x,bcd;f(),bcd=e`},
{`var{a}=x;f();var b,d;`, `var{a}=x,b,d;f()`},
{`var{a}=x;f();var b,d=e;`, `var{a}=x,b,d;f(),d=e`},
{`var{a}=x;f();var b=c,d=e;`, `var{a}=x,b,d;f(),b=c,d=e`},
{`var{a}=x;f();var[b]=c,d=e;`, `var{a}=x;f();var[b]=c,d=e`},
// {`var{a}=x;f();var{b}=y`, `var{a}=x,b;f(),{b}=y`}, // we can't know that {b} doesn't require parentheses
{`var a=0;a=1`, `var a=0,a=1`},
{`var a,b;a=b`, `var b,a=b`},
{`var a,b=c;a=b`, `var b=c,a=b`},
{`var a,b=c;b=a`, `var a,b=c,b=a`},
{`var{a}=f;var b=c,d=e;`, `var{a}=f,b=c,d=e`},
{`var a,b;a=1,b=2,c=3`, `var a=1,b=2;c=3`},
{`var a=[];var b={};var c=d,e=f`, `var a=[],b={},c=d,e=f`},
{`var a=[];var b={};var c=d,e=f`, `var a=[],b={},c=d,e=f`},
{`var a=[];var b;var c,e=f`, `var b,c,a=[],e=f`},
{`var a=[];f();var b;f();var c;f();var e=f`, `var b,c,e,a=[];f(),f(),f(),e=f`},
{`var {...a}=c;for(var {...b}=d;b;b++);`, `for(var{...a}=c,{...b}=d;b;b++);`},
{`var o=8,p=9,x=0,y=1;x=x+2;y=y+3;var b=1,c=2,d=3`, `var o=8,p=9,x=0,y=1,x=x+2,y=y+3,b=1,c=2,d=3`},
{`var result=[];for(var a=0,array=d;a<array.length;a++){var v=array[a]}`, `for(var v,result=[],a=0,array=d;a<array.length;a++)v=array[a]`},
//{`var name=function name(){name()}`, `var name=function(){name()}`}, // TODO
{`var a=0,b=a;var c=1,d=2,e=3`, `var a=0,b=a,c=1,d=2,e=3`},
// TODO: test for variables renaming (first rename, then merge vars)
// function and method declarations
//{`function f(){}`, `f=()=>{}`},
//{`function f(a){}`, `f=a=>{}`},
//{`function f(a,b){}`, `f=(a,b)=>{}`},
//{`function f(){this}`, `function f(){this}`},
//{`function f(){arguments}`, `function f(){arguments}`},
//{`function f(){}; new f()`, `function f(){}; new f()`},
{`function g(){return}`, `function g(){}`},
{`function g(){return undefined}`, `function g(){}`},
{`function g(){return void 0}`, `function g(){}`},
{`function g(){return a++,void 0}`, `function g(){a++}`},
{`for (var a of b){continue}`, `for(var a of b);`},
{`for (var a of b){continue LABEL}`, `for(var a of b)continue LABEL`},
{`for (var a of b){break}`, `for(var a of b)break`},
{`class a{static g(){}}`, `class a{static g(){}}`},
{`class a{static [1](){}}`, `class a{static[1](){}}`},
{`class a{static*g(){}}`, `class a{static*g(){}}`},
{`class a{static*[1](){}}`, `class a{static*[1](){}}`},
{`class a{get g(){}}`, `class a{get g(){}}`},
{`class a{get [1](){}}`, `class a{get[1](){}}`},
{`class a{set g(){}}`, `class a{set g(){}}`},
{`class a{set [1](){}}`, `class a{set[1](){}}`},
{`class a{static async g(){}}`, `class a{static async g(){}}`},
{`class a{static async [1](){}}`, `class a{static async[1](){}}`},
{`class a{static async*g(){}}`, `class a{static async*g(){}}`},
{`class a{static async*[1](){}}`, `class a{static async*[1](){}}`},
{`class a{"f"(){}}`, `class a{f(){}}`},
{`class a{f(){};g(){}}`, `class a{f(){}g(){}}`},
{`class a{one;#two = 2;f(){}}`, `class a{one;#two=2;f(){}}`},
//{`function g(){a()} function g(){b()}`, `function g(){b()}`},
// dead code
//{`return;a`, `return`},
//{`break;a`, `break`},
//{`if(a){return;a=5;b=6}`, `if(a)return`},
//{`if(a){throw a;a=5}`, `if(a)throw a`},
//{`if(a){break;a=5}`, `if(a)break`},
//{`if(a){continue;a=5}`, `if(a)continue`},
//{`if(a){return a;a=5}return b`, `return a||b`},
//{`if(a){throw a;a=5}throw b`, `throw a||b`},
//{`if(a){return;var b}return`, `a;var b`},
//{`if(a){return;function b(){}}`, `a;var b`},
//{`for (var a of b){continue;var c}`, `for(var a of b){}var c`},
//{`if(false)a++;else b`, `b`},
//{`if(false){var a}`, `var a`},
//{`if(false){var a;a++}else b`, `var a;b`},
//{`if(false){function a(c){return d};a++}else b`, `var a;b`},
//{`if(!1)a++;else b`, `b`},
//{`if(null)a++;else b`, `b`},
//{`var a;if(false)var b`, `var a,b`},
//{`var a;if(false)var b=5`, `var a,b`},
//{`var a;if(false){const b}`, `var a`},
//{`var a;if(false){function b(){}}`, `var a;if(!1)function b(){}`},
//{`function f(){if(a){a=5;return}a=6;return a}`, `function f(){if(!a){a=6;return a}a=5}`},
//{`function g(){return;var a;a=b}`, `function g(){var a;}`},
//{`function g(){return 5;function f(){}}`, `function g(){return 5;function f(){}}`},
//{`function g(){if(a)return a;else return b;var c;c=d}`, `function g(){var c;return a||b}`},
//{`()=>a()`, ``},
{`if(true){let b}`, ``},
{`if(true){let b=5}`, ``},
{`if(true){const b=c}`, `c`},
{`if(true){const b=c.d}`, `c.d`},
// arrow functions
{`() => {}`, `()=>{}`},
{`(a) => {a}`, `a=>{a}`},
{`(...a) => {}`, `(...a)=>{}`},
{`(a=0) => {a}`, `(a=0)=>{a}`},
{`(a,b) => {a,b}`, `(a,b)=>{a,b}`},
{`a => {a++}`, `a=>{a++}`},
{`x=(a) => {a}`, `x=a=>{a}`},
{`x=() => {return}`, `x=()=>{}`},
{`x=(a) => {return a}`, `x=a=>a`},
{`x=(a) => {a++;return a}`, `x=a=>(a++,a)`},
{`x=(a) => {while(b);return}`, `x=a=>{for(;b;);}`},
{`x=(a) => {while(b);return a}`, `x=a=>{for(;b;);return a}`},
{`x=(a) => {a++}`, `x=a=>{a++}`},
{`x=(a) => {a++}`, `x=a=>{a++}`},
{`x=(a,b) => a+b`, `x=(a,b)=>a+b`},
{`async a => await b`, `async a=>await b`},
{`([])=>5`, `([])=>5`},
{`({})=>5`, `({})=>5`},
// remove groups
{`a=(b+c)+d`, `a=b+c+d`},
{`a=b+(c+d)`, `a=b+(c+d)`},
{`a=b*(c+d)`, `a=b*(c+d)`},
{`a=(b*c)+d`, `a=b*c+d`},
{`a=(b.c)++`, `a=b.c++`},
{`a=(b++).c`, `a=(b++).c`},
{`a=!(b++)`, `a=!b++`},
{`a=(b+c)(d)`, `a=(b+c)(d)`},
{`a=b**(c**d)`, `a=b**c**d`},
{`a=(b**c)**d`, `a=(b**c)**d`},
{`a=false**2`, `a=(!1)**2`},
{`a=(++b)**2`, `a=++b**2`},
{`a=(a||b)&&c`, `a=(a||b)&&c`},
//{`a=a||(b&&c)`, `a||=b&&c`},
{`a=(a&&b)||c`, `a=a&&b||c`},
//{`a=a&&(b||c)`, `a&&=b||c`},
//{`a=a&&(b&&c)`, `a&&=b&&c`},
{`a=c&&(a??b)`, `a=c&&(a??b)`},
{`a=(a||b)??(c||d)`, `a=(a||b)??(c||d)`},
{`a=(a&&b)??(c&&d)`, `a=(a&&b)??(c&&d)`},
{`a=(a??b)??(c??d)`, `a=a??b??c??d`},
{`a=(a||b)||(c||d)`, `a=a||b||c||d`},
{`a=!(!b)`, `a=!!b`},
{`a=(b())`, `a=b()`},
{`a=(b)?.(c,d)`, `a=b?.(c,d)`},
{`a=(b,c)?.(d)`, `a=(b,c)?.(d)`},
{`a=(b?c:e)?.(d)`, `a=(b?c:e)?.(d)`},
{`a=b?c:c`, `a=(b,c)`},
{`a=b?b:c=f`, `a=b?b:c=f`}, // don't write as a=b||(c=f)
{`a=b||(c=f)`, `a=b||(c=f)`},
{`a=(-5)**3`, `a=(-5)**3`},
{`a=5**(-3)`, `a=5**-3`},
{`a=(-(+5))**3`, `a=(-+5)**3`}, // could remove +
{`a=(b,c)+3`, `a=(b,c)+3`},
{`(a,b)&&c`, `a,b&&c`},
{`function*x(){a=(yield b)}`, `function*x(){a=yield b}`},
{`function*x(){a=yield (yield b)}`, `function*x(){a=yield yield b}`},
{`if((a))while((b));`, `if(a)for(;b;);`},
{`({a}=5)`, `({a}=5)`},
{`({a:a}=5)`, `({a}=5)`},
{`({a:"a"}=5)`, `({a:"a"}=5)`},
{`(function(){})`, `!function(){}`},
{`(function(){}())`, `(function(){})()`},
{`(function(){})()`, `(function(){})()`},
{`(function(){})();x=5;f=6`, `(function(){})(),x=5,f=6`},
{`(async function(){})`, `!async function(){}`},
{`(class a{})`, `!class a{}`},
{`(let [a])`, `!let[a]`},
{`x=(function(){})`, `x=function(){}`},
{`x=(function(){}())`, `x=function(){}()`},
{`x=(function(){})()`, `x=function(){}()`},
{`x=(function(){}).a`, `x=function(){}.a`},
{`function g(){await(x+y)}`, `function g(){await(x+y)}`},
{`async function g(){await(x+y)}`, `async function g(){await(x+y)}`},
{`function g(){await(fun()())}`, `function g(){await(fun()())}`},
{`async function g(){await(fun()())}`, `async function g(){await fun()()}`},
{`function g(){await((fun())())}`, `function g(){await(fun()())}`},
{`a=1+"2"+(3+4)`, `a=1+"2"+(3+4)`},
{`(-1)()`, `(-1)()`},
{`(-1)(-2)`, `(-1)(-2)`},
{`(+new Date).toString(32)`, `(+new Date).toString(32)`},
{`(2).toFixed(0)`, `2..toFixed(0)`},
{`(0.2).toFixed(0)`, `.2.toFixed(0)`},
{`(2e-8).toFixed(0)`, `2e-8.toFixed(0)`},
{`(-2).toFixed(0)`, `(-2).toFixed(0)`},
{`(a)=>((b)=>c)`, `a=>b=>c`},
{`function f(a=(3+2)){a}`, `function f(a=3+2){a}`},
{`function*a(){yield a.b}`, `function*a(){yield a.b}`},
{`function*a(){(yield a).b}`, `function*a(){(yield a).b}`},
{`function*a(){yield a["-"]}`, `function*a(){yield a["-"]}`},
{`function*a(){(yield a)["-"]}`, `function*a(){(yield a)["-"]}`},
{`new(a(b))`, `new(a(b))`},
{`new(new a)`, `new new a`},
{`new new a()()`, `new new a`},
{`new(new a(b))`, `new new a(b)`},
{`new(a(b))(c)`, `new(a(b))(c)`},
{`new(a(b).c)(d)`, `new(a(b).c)(d)`},
{`new(a(b)[5])(d)`, `new(a(b)[5])(d)`},
{"new(a(b)`tmpl`)(d)", "new(a(b)`tmpl`)(d)"},
{`new(a(b)).c(d)`, `new(a(b)).c(d)`},
{`new(a(b))[5](d)`, `new(a(b))[5](d)`},
{"new(a(b))`tmpl`(d)", "new(a(b))`tmpl`(d)"},
{`new a().b(c)`, `(new a).b(c)`},
{`(new a).b(c)`, `(new a).b(c)`},
{`(new a.b).c(d)`, `(new a.b).c(d)`},
{`(new a(b)).c(d)`, `new a(b).c(d)`},
{`(new a().b).c(d)`, `(new a).b.c(d)`},
{`new a()`, `new a`},
{`new a()()`, `(new a)()`},
{`new a()?.()`, `(new a)?.()`},
{`new(a.b)instanceof c`, `new a.b instanceof c`},
{`new(a[b])instanceof c`, `new a[b]instanceof c`},
{"new(a`tmpl`)instanceof c", "new a`tmpl`instanceof c"},
{`(a()).b(c)`, `a().b(c)`},
{`(a()[5]).b(c)`, `a()[5].b(c)`},
{"(a()`tmpl`).b(c)", "a()`tmpl`.b(c)"},
{`(a?.b).c(d)`, `(a?.b).c(d)`},
{`(a?.(c)).d(e)`, `(a?.(c)).d(e)`},
{`(a?.b.c).d`, `(a?.b.c).d`},
{`class a extends (new b){}`, `class a extends new b{}`},
{`(new.target)`, `new.target`},
{`(import.meta)`, `import.meta`},
{`import.meta.url`, `import.meta.url`},
{`super.name`, `super.name`},
{"(`tmpl`)", "`tmpl`"},
{"(a`tmpl`)", "a`tmpl`"},
{"a=-(b=5)", "a=-(b=5)"},
{"f({},(a=5,b))", "f({},(a=5,b))"},
{"for(var a=(b in c);;);", "for(var a=(b in c);;);"},
{`(1,2,a=3)&&b`, `(1,2,a=3)&&b`},
{`(1,2,a||3)&&b`, `(1,2,a||3)&&b`},
{`(1,2,a??3)&&b`, `(1,2,a??3)&&b`},
{`(1,2,a&&3)&&b`, `1,2,a&&3&&b`},
{`(1,2,a|3)&&b`, `1,2,a|3&&b`},
{`(a,b)?c:b`, `a,b&&c`},
{`(a,b)?c:d`, `a,b?c:d`},
{`f(...a,...b)`, `f(...a,...b)`},
// expressions
{`a?true:false`, `!!a`},
{`a==b?true:false`, `a==b`},
{`!a?true:false`, `!a`},
{`a?false:true`, `!a`},
{`!a?false:true`, `!!a`},
{`a?!0:!1`, `!!a`},
{`a?0:1`, `a?0:1`},
{`!!a?0:1`, `!!a?0:1`},
{`a&&b?!1:!0`, `!a||!b`},
{`a&&b?!0:!1`, `!!(a&&b)`},
{`a?true:5`, `!!a||5`},
{`a?5:false`, `!!a&&5`},
{`!a?true:5`, `!a||5`},
{`!a?5:false`, `!a&&5`},
{`a==b?true:5`, `a==b||5`},
{`a!=b?true:5`, `a!=b||5`},
{`a==b?false:5`, `a!=b&&5`},
{`a!=b?false:5`, `a==b&&5`},
{`a===b?false:5`, `a!==b&&5`},
{`a!==b?false:5`, `a===b&&5`},
{`a==b?5:true`, `a!=b||5`},
{`a==b?5:false`, `a==b&&5`},
{`a<b?5:true`, `!(a<b)||5`},
{`!(a<b)?5:true`, `a<b||5`},
{`!true?5:true`, `!0`},
{`true?a:b`, `a`},
{`false?a:b`, `b`},
{`!false?a:b`, `a`},
{`!!false?a:b`, `b`},
{`!!!false?a:b`, `a`},
{`undefined?a:b`, `b`},
{`NaN?a:b`, `b`},
{`1?a:b`, `a`},
{`0.00e100?a:b`, `b`},
{`0x00?a:b`, `b`},
{`0B00?a:b`, `b`},
{`0o00?a:b`, `b`},
{`0n?a:b`, `b`},
{`(0n?a:b)()`, `b()`},
{`!0`, `!0`},
{`!42`, `!1`},
{`!"str"`, `!1`},
{`!/regexp/`, `!1`},
{`typeof a==="object"`, `typeof a=="object"`},
{`typeof a!=="object"`, `typeof a!="object"`},
{`"object"===typeof a`, `"object"==typeof a`},
{`"object"!==typeof a`, `"object"!=typeof a`},
{`typeof a===b`, `typeof a===b`},
//{`typeof a==="undefined"`, `typeof a<"u"`}, // only for >ES2020 and not IE
{`a!=null?a:b`, `a??b`},
{`a==null?b:a`, `a??b`},
{`a!=undefined?a:b`, `a??b`},
{`a==undefined?b:a`, `a??b`},
{`a==null?true:a`, `a??!0`},
{`null==a?true:a`, `a??!0`},
{`a!=null?a:true`, `a??!0`},
{`a==undefined?true:a`, `a??!0`},
{`a!=undefined?a:true`, `a??!0`},
{`a?a:b`, `a||b`},
{`a?b:a`, `a&&b`},
{`a&&=b`, `a&&=b`},
{`a||=b`, `a||=b`},
{`a??=b`, `a??=b`},
{`a==false`, `a==!1`},
//{`a===false`, `a===false`},
{`!(a||b)`, `!a&&!b`},
{`!(a&&b)`, `!a||!b`},
{`!(a&&b)&&c`, `!(a&&b)&&c`},
{`c&&!(a&&b===5)`, `c&&!(a&&b===5)`},
{`c&&!(!a&&b!==5)`, `c&&!(!a&&b!==5)`},
{`c&&!(a==3&&b!==5)`, `c&&(a!=3||b===5)`},
{`!(a>=0&&a<=1||a>=2&&a<=3)`, `!(a>=0&&a<=1||a>=2&&a<=3)`},
{`!(0<1||1<2)`, `!(0<1||1<2)`},
{`!(0<1&&1<2)`, `!(0<1&&1<2)`},
{`!(a&&b||c&&d)`, `!(a&&b||c&&d)`},
{`!((a||b)&&(c||d))`, `!a&&!b||!c&&!d`},
{`a==false||b==true?false:true`, `a!=!1&&b!=!0`},
//{`!(!(a>=0||a<=1)&&!(a>=2||a<=3))`, `!!(a>=0||a<=1||a>=2||a<=3)`}, // TODO
{`!!(a===null||a===undefined)`, `a==null`},
{`a!==null&&a!==undefined`, `a!=null`},
{`a===null||a===void 0`, `a==null`},
{`!!(a===b||c===d)`, `a===b||c===d`},
{`!(a!==null)`, `a===null`},
{`a==void 0`, `a==null`},
{`a?b(c):b(d)`, `b(a?c:d)`},
//{`if(a!==null&&a!==undefined)a.b()`, `a?.b()`}, // returns undefined instead of false
{`(a===null||a===undefined)?undefined:a()`, `a?.()`},
{`(a===null||a===undefined)?undefined:a[0]`, `a?.[0]`},
{"(a===null||a===undefined)?undefined:a`tpl`", "a?.`tpl`"},
{`(a===null||a===undefined)?undefined:a.b`, `a?.b`},
{`(a===null||a===undefined)?undefined:a.b()`, `a?.b()`},
{`(a===null||a===undefined)?undefined:a.b[0]`, `a?.b[0]`},
{"(a===null||a===undefined)?undefined:a.b`tpl`", "a?.b`tpl`"},
{`(a===null||a===undefined)?undefined:a.#b`, `a?.#b`},
{`(((a===null)||(a===undefined)))?undefined:a()`, `a?.()`},
//{`(a.b===null||a.b===undefined)?undefined:a.b()`, `a.b?.()`},
{`a=1+a`, `++a`},
{`a=a-1`, `--a`},
//{`a=a+5`, `a+=5`},
//{`a=5+a`, `a+=5`},
//{`a=a+b`, `a+=b`},
//{`a=a^b`, `a^=b`},
// other
{`async function g(){await x+y}`, `async function g(){await x+y}`},
{`a={"property": val1, "2": val2, "3name": val3};`, `a={property:val1,2:val2,"3name":val3}`},
{`a={"key'\"": v,};`, `a={"key'\"":v}`},
{`() => { const v=6; x={v} }`, `()=>{const v=6;x={v}}`},
{`a=obj["if"]`, `a=obj.if`},
{`a=obj["2"]`, `a=obj[2]`},
{`a=obj["3name"]`, `a=obj["3name"]`},
{"a=b`tmpl${a?b:b}tmpl`", "a=b`tmpl${a,b}tmpl`"},
{`a=b?.[c]`, `a=b?.[c]`},
{`a=b?.["c"]`, `a=b?.c`}, // #757
{`a=b?.["c d"]`, `a=b?.["c d"]`}, // #757
{`a=b.#c`, `a=b.#c`},
{`a=b().#c`, `a=b().#c`},
{`a=b?.#c`, `a=b?.#c`},
{`a={b(c){c}}`, `a={b(c){c}}`},
{`a(b,...c)`, `a(b,...c)`},
{`let a="string";a`, `let a="string";a`},
{`f((a,b)||d)`, `f((a,b)||d)`},
// math functions, see #790
{`Math.abs(x)`, `x<0?-x:x`},
{`Math.trunc(x)`, `x|0`},
{`Math.pow(a,b)`, `a**b`},
{`Math.pow(-a,b)`, `(-a)**b`},
{`Math.sqrt(a)`, `a**.5`},
{`++Math.sqrt(a*5)`, `++((a*5)**.5)`},
{`isNaN(x)`, `isNaN(x)`},
{`Number(undefined)`, `NaN`},
{`Number(null)`, `0`},
{`Number(true)`, `1`},
{`Number(false)`, `0`},
{`Number(100)`, `100`},
{`Number(100n)`, `100`},
{`module.abs(x)`, `module.abs(x)`},
{`module.isNaN(x)`, `module.isNaN(x)`},
{`function isNaN(){}isNaN(x)`, `function isNaN(){}isNaN(x)`},
// merge expressions
{`function f(){b=5;return a+b}`, `function f(){return b=5,a+b}`},
{`b=5;throw a+b`, `throw b=5,a+b`},
{`function f(){a();b();return c()}`, `function f(){return a(),b(),c()}`},
{`a();b();throw c()`, `throw a(),b(),c()`},
{`function f(){a=b;if(a){return a}else return b}`, `function f(){return a=b,a||b}`},
{`a=5;if(b)while(c);`, `if(a=5,b)for(;c;);`},
{`a=5;while(b)c()`, `for(a=5;b;)c()`},
{`a=5;while(b){c()}`, `for(a=5;b;)c()`},
{`a=5;for(;b;)c()`, `for(a=5;b;)c()`},
{`a=5;for(b=4;b;)c()`, `a=5;for(b=4;b;)c()`},
//{`a in 5;for(;b;)c()`, `a in 5;for(;b;)c()`}, // TODO
{`a in 5;for(b=4;b;)c()`, `a in 5;for(b=4;b;)c()`},
{`var a;for(var b=0;b;b++);a`, `for(var a,b=0;b;b++);a`},
{`var a=1;for(var b=0;b;b++);a`, `for(var a=1,b=0;b;b++);a`},
{`var a=1;for(var a;a;a++);`, `for(var a=1;a;a++);`},
{`var a;for(var a=1;a;a++);`, `for(var a=1;a;a++);`},
{`var a=5;for(;a;)c()`, `for(var a=5;a;)c()`},
{`let a=5;for(;a;)c()`, `let a=5;for(;a;)c()`},
{`var a=b in c;for(;a;)c()`, `for(var a=(b in c);a;)c()`},
{`var a=5;for(var a=6,b;b;)c()`, `for(var b,a=5,a=6;b;)c()`},
{`var a=5;for(var a,b;b;)c()`, `for(var b,a=5;b;)c()`},
{`var a=5;for(var b=6,c=7;;);`, `for(var a=5,b=6,c=7;;);`},
{`var a=5;while(a)c()`, `for(var a=5;a;)c()`},
{`var a=5;while(a){c()}`, `for(var a=5;a;)c()`},
{`let a=5;while(a)c()`, `let a=5;for(;a;)c()`},
//{`var a;for(a=5;b;)c()`, `for(var a=5;b;)c()`}, // TODO
{`a=5;for(var a;b;)c()`, `for(var a=5;b;)c()`},
{`a=5;for(var b=4;b;)c()`, `a=5;for(var b=4;b;)c()`},
{`a=5;switch(b=4){}`, `switch(a=5,b=4){}`},
{`a=5;with(b=4){}`, `with(a=5,b=4);`},
{`(function(){})();(function(){})()`, `(function(){})(),function(){}()`},
//{`for(var a=0;;){var b=5;var d=6;for(var c=0;;);}`, `for(a=0;;)for(var a,b=5,d=6,c=0;;);`}, // TODO
//{`var aaaa=[];for(var b=0;;){}for(var b in aaaa){}var aaaa=[];for(var b=0;;){}`, `for(var aaaa=[],b=0;;);for(b in aaaa);for(aaaa=[],b=0;;);`}, // TODO
// collapse functions
//{`var a=function(){return 5}`, `var a=()=>5`},
//{`var a=async function(b){b=6;return 5}`, `var a=async b=>(b=6,5)`},
//{`(function(){return 5})()`, `(()=>5)()`},
//{`class c{a(){return 5}}`, `class c{a:()=>5}`},
//{`export default{a(){return 5}}`, `export default{a:()=>5}`},
//{`var v={async [[1]](a){return a}}`, `var v={[[1]]:async a=>a}`},
//{`var a={b:()=>c=5}`, `var a={b(){c=5}}`},
//{`var a={b:function(){c=5}}`, `var a={b(){c=5}}`},
//{`var a={b:async function(){c=5}}`, `var a={async b(){c=5}}`},
//{`var a={b:function*(){c=5}}`, `var a={*b(){c=5}}`},
//{`a=function(){return 5}()`, `a=5`}, // TODO
//{`a=function(){if(b){return 3}return 5}()`, `a=b?3:5`}, // TODO
// collapse variables
//{`{let a}`, ``}, // TODO
//{`a=5;b=a;c=b+4`, `c=5+4`}, // TODO
//{`const a=6;f(a)`, `f(6)`}, // TODO: inline single-use variables that are literals
//{`let a="string";f(a)`, `f("string")`}, // TODO: inline single-use variables that are literals
//{`{let a="string"}a`, `a`},
//{`!function(){var a}`, `!function(){}`}, // TODO
//{`'a b c'.split(' ')`, `['a','b','c']`}, // TODO?
// regexps
{`/\\\/\[/`, `/\\\/\[/`},
{`/[\\\]]/`, `/[\\\]]/`},
{`/[\[]/`, `/[[]/`},
{`/\.\cA\x10\u0010\p{x}\P{x}\0\f\v\n\r\t\S\s\W\w\D\d\b\B\k/`, `/\.\cA\x10\u0010\p{x}\P{x}\0\f\v\n\r\t\S\s\W\w\D\d\b\B\k/`},
{`/\^\|\(\)\1\*\+\?\{\$/`, `/\^\|\(\)\1\*\+\?\{\$/`},
{`/[^\-]/`, `/[^-]/`},
{`/[^\-\-]/`, `/[^--]/`},
{`/[\^\-\-]/`, `/[\^\--]/`},
{`/[^\-\-\-]/`, `/[^-\--]/`},
{`/[^a-b\-]/`, `/[^a-b-]/`},
{`/[^a-b\-\-]/`, `/[^a-b--]/`},
{`/[^a-b\-\-\-]/`, `/[^a-b-\--]/`},
{`/[^a\-\--\-\-\-]/`, `/[^a\-\-----]/`},
// edge-cases
{`let o=null;try{o=(o?.a).b||"FAIL"}catch(x){}console.log(o||"PASS")`, `let o=null;try{o=(o?.a).b||"FAIL"}catch{}console.log(o||"PASS")`},
{`1..a`, `1..a`},
{`1.5.a`, `1.5.a`},
{`1e4.a`, `1e4.a`},
{`t0.a`, `t0.a`},
{`for(;a < !--script;);`, `for(;a<! --script;);`},
{`for(;a < /script>/;);`, `for(;a< /script>/;);`},
{`a<<!--script`, `a<<! --script`},
{`a<</script>/`, `a<< /script>/`},
{`function f(a,b){a();for(const c of b){const b=0}}`, `function f(a,b){a();for(const c of b){const b=0}}`},
{`function f(){return a,b,void 0}`, `function f(){return a,b}`},
{`var arr=[];var slice=arr.slice;var concat=arr.concat;var push=arr.push;var indexOf=arr.indexOf;var class2type={};`, `var arr=[],slice=arr.slice,concat=arr.concat,push=arr.push,indexOf=arr.indexOf,class2type={}`},
{`var arr=[];var class2type={};a=5;var rlocalProtocol=0`, `var arr=[],class2type={};a=5;var rlocalProtocol=0`},
{`function f(){a=b;if(!o)return c;return d}`, `function f(){return a=b,o?d:c}`},
// go-fuzz
{`({"":a})`, `({"":a})`},
{`a[""]`, `a[""]`},
{`function f(){;}`, `function f(){}`},
{`0xeb00000000`, `0xeb00000000`},
{`export{a,}`, `export{a,}`},
{`var D;var{U,W,W}=y`, `var{U,W,W}=y,D`},
{`var A;var b=(function(){var e;})=c,d`, `var d,A,b=function(){var e}=c`},
{`0xB_BBBbAbA`, `3149642426`},
{`"\udFEb"`, `"\udFEb"`},
{`' \u{0}\u{0}\u{0\0\ '`, `" \x00\x00\u{0\0 "`},
// bugs
{"var a=/\\s?auto?\\s?/i\nvar b;a,b", "var b,a=/\\s?auto?\\s?/i;a,b"}, // #14
{"false`string`", "(!1)`string`"}, // #181
{"x / /\\d+/.exec(s)[0]", "x/ /\\d+/.exec(s)[0]"}, // #183
{`()=>{return{a}}`, `()=>({a})`}, // #333
{`()=>({a})`, `()=>({a})`}, // #333
{`function f(){if(a){return 1}else if(b){return 2}return 3}`, `function f(){return a?1:b?2:3}`}, // #335
{`new RegExp("\xAA\xB5")`, `new RegExp("\xAA\xB5")`}, // #341
{`for(var a;;)a();var b=5`, `for(;;)a();var a,b=5`}, // #346
{`if(e?0:n=1,o=2){o.a}`, `(e?0:n=1,o=2)&&o.a`}, // #347
{`const a=(a,b)=>({...a,b})`, `const a=(a,b)=>({...a,b})`}, // #369
{`if(!a)debugger;`, `if(!a)debugger`}, // #370
{`export function a(b){b}`, `export function a(b){b}`}, // #375
{`switch(a){case 0:b=c;d=e}`, `switch(a){case 0:b=c,d=e}`}, // #426
{`if(a){const b=0}`, `a`}, // #428
{`()=>({a(){b=!b}})`, `()=>({a(){b=!b}})`}, // #429
{`var a=1;function f(){return 1}var{min,max}=Math;function g(){return 2}`, `a=1;function f(){return 1}var{min,max}=Math,a;function g(){return 2}`}, // #445
{`const f=x=>void console.log(x)`, `const f=x=>void console.log(x)`}, // #463
{`(function(){var a=b;var c=d.x,e=f.y})()`, `(function(){var a=b,c=d.x,e=f.y})()`}, // #472
{`var a=1;g();a=2;let b=3`, `var a=1;g(),a=2;let b=3`}, // #474
{`if(!(0<1&&1<2)){throw new Error()}`, `if(!(0<1&&1<2))throw new Error`}, // #479
{`class A{set x(e){}}`, `class A{set x(e){}}`}, // #481
{`if(a){let b=c(d)}`, `a&&c(d)`}, // #487
{`var a=5;({});var b={c:()=>3}`, `var b,a=5;({},b={c:()=>3})`}, // #494
{`var a=5;({});var b=function(){3}`, `var b,a=5;({},b=function(){3})`}, // #494
{`var a=5;({});var b=class{c(){3}}`, `var b,a=5;({},b=class{c(){3}})`}, // #494
{`({});a={b(){3}}`, `({},a={b(){3}})`}, // #494
{`export default function Foo(){a}Foo.prototype.bar=b`, `export default function Foo(){a}Foo.prototype.bar=b`}, // #525
{`(e=1,e=2)`, `e=1,e=2`}, // #528
{`"\x00\x31 \0\u0000"`, `"\x001 \0\x00"`}, // #577
{`function transform(){{var aaaa=[];for(var b=0;;){}for(var b in aaaa){}var aaaa=[];for(var b=0;;){}}}`, `function transform(){{for(var aaaa=[],b=0;;);for(b in aaaa);for(var aaaa=[],b=0;;);}}`}, // #619
{`for(var a=0;;){var b=5;for(var c=0;;);}`, `for(var b,c,a=0;;)for(b=5,c=0;;);`}, // #634
{"if(a)for(;;)\n;else b", `if(a)for(;;);else b`}, // #636
{`'\u000A\u000D'`, "`\n\\r`"}, // #653
{`for(!a;b;c);`, "for(!a;b;c);"}, // #656
{"var a = /*! comment */ b;", "/*! comment */var a=b"}, // #664
{`var c="";for(let i=0;;);var d="";for(let i=0;;);`, `var d,c="";for(let i=0;;);d="";for(let i=0;;);`}, // #687
{"String.raw`\\b`", "String.raw`\\b`"}, // #701
{"if(true){const a=setInterval(()=>{clearInterval(a)},100)}", "{const a=setInterval(()=>{clearInterval(a)},100)}"}, // #867
{"({a(key){if(x){b.push({key})}}})", "({a(key){x&&b.push({key})}})"}, // #910
{"(a?.b()).c", "(a?.b()).c"}, // #912
{`var a=0;var b=1,c=[...b],[d]=1;`, "var[d]=1,a=0,b=1,c=[...b]"}, // #926
{`class A{get #a(){} set #a(x){}}`, `class A{get#a(){}set#a(x){}}`}, // #932
{`()=>{const a=1,{b}=a}`, `()=>{const a=1,{b}=a}`}, // # 939
{`()=>{const a={b};const{c}={d:a}}`, `()=>{const a={b},{c}={d:a}}`}, // # 939
}
m := minify.New()
o := Minifier{KeepVarNames: true, useAlphabetVarNames: true}
for _, tt := range jsTests {
t.Run(tt.js, func(t *testing.T) {
r := bytes.NewBufferString(tt.js)
w := &bytes.Buffer{}
err := o.Minify(m, w, r, nil)
test.Minify(t, tt.js, err, w.String(), tt.expected)
})
}
}
func TestJSVarRenaming(t *testing.T) {
jsTests := []struct {
js string
expected string
}{
{`x=function(){var name;name}`, `x=function(){var a;a}`},
{`x=function(){var once,twice;once,twice++}`, `x=function(){var a,b;a,b++}`},
{`x=function(){try{var x;x}catch(y){x,y}}`, `x=function(){try{var a;a}catch(b){a,b}}`},
{`x=function(){try{var x;x}catch(x){x}}`, `x=function(){try{var a;a}catch(a){a}}`},
{`x=function(){function name(){}}`, `x=function(){function a(){}}`},
{`x=function name(){}`, `x=function(){}`},
{`x=function(){let a;{let b;b,a}}`, `x=function(){let a;{let b;b,a}}`},
//{`x=function(){let a;{let b;a}}`, `x=function(){let a;a}`}, // TODO: b unused
{`x=function({foo, bar}){}`, `x=function({foo:a,bar:b}){}`},
{`x=function(){class Wheel{}}`, `x=function(){class a{}}`},
{`x=function(){function name(arg1, arg2){return arg1, arg2}}`, `x=function(){function a(a,b){return a,b}}`},
{`x=function(){function name(arg1, arg2){return arg1, arg2} return arg1}`, `x=function(){function a(a,b){return a,b}return arg1}`},
{`x=function(){function name(arg1, arg2){return arg1, arg2} return a}`, `x=function(){function b(a,b){return a,b}return a}`},
{`x=function(){function add(l,r){return add(l,r)}function nadd(l,r){return-add(l,r)}}`, `x=function(){function a(b,c){return a(b,c)}function b(b,c){return-a(b,c)}}`},
{`function a(){var b;b}`, `function a(){var a;a}`},
{`!function(){x=function(){return fun()};var fun=function(){return 0}}`, `!function(){x=function(){return a()};var a=function(){return 0}}`},
{`!function(){var x=function(){return y};const y=5;x,y}`, `!function(){var b=function(){return a};const a=5;b,a}`},
{`!function(){if(1){const x=5;x;5}var y=function(){return x};y}`, `!function(){{const a=5;a,5}var a=function(){return x};a}`},
{`!function(){var x=function(){return y};x;if(1){const y=5;y;5}}`, `!function(){var a=function(){return y};a;{const a=5;a,5}}`},
{`!function(){var x=function(){return y};x;if(z)var y=5}`, `!function(){var a,b=function(){return a};b,z&&(a=5)}`},
{`!function(){var x=function(){return y};x;if(z){var y=5;5}}`, `!function(){var a,b=function(){return a};b,z&&(a=5,5)}`},
{`!function(){var x,y,z=(x,y)=>x+y;x,y,z}`, `!function(){var a,b,c=(a,b)=>a+b;a,b,c}`},
{`!function(){var await;print({await});}`, `!function(){var a;print({await:a})}`},
{`function a(){var name; return {name}}`, `function a(){var a;return{name:a}}`},
{`function a(){try{}catch(arg){arg}}`, `function a(){try{}catch(a){a}}`},
{`function a(){var name,z;z;try{}catch(name){var name}}`, `function a(){var a,b;b;try{}catch{}}`},
{`function a(){var name,z;z;try{}catch(arg){var name}}`, `function a(){var a,b;b;try{}catch{}}`},
{`function a(b){function c(d){b[d]}}`, `function a(a){function b(b){a[b]}}`},
{`function r(o){function l(t){if(!z[t]){if(!o[t]);}}}`, `function r(a){function b(b){z[b]||!a[b]}}`},
{`!function(a){a;for(var b=0;;);};var c;var d;`, `!function(a){a;for(var b=0;;);};var c,d`},
{`!function(){var b;b;{(T=x),T}{var T}}`, `!function(){var a,b;b,a=x,a}`},
{`var T;T;!function(){var b;b;{(T=x),T}{var T}}`, `var T;T,!function(){var a,b;b,a=x,a}`},
{`!function(){let a=b,b=c,c=d,d=e,e=f,f=g,g=h,h=a,j;for(let i=0;;)j=4}`, `!function(){let a=b,b=c,c=d,d=e,e=f,f=g,g=h,h=a,i;for(let a=0;;)i=4}`},
{`function a(){var name;with(z){name}} function b(){var name;name}`, `function a(){var name;with(z)name}function b(){var a;a}`},
{`!function(){var name;{name;!function(){name;var other;other}}}`, `!function(){var a;a,!function(){a;var b;b}}`},
{`name=function(){var a001,a002,a003,a004,a005,a006,a007,a008,a009,a010,a011,a012,a013,a014,a015,a016,a017,a018,a019,a020,a021,a022,a023,a024,a025,a026,a027,a028,a029,a030,a031,a032,a033,a034,a035,a036,a037,a038,a039,a040,a041,a042,a043,a044,a045,a046,a047,a048,a049,a050,a051,a052,a053,a054,a055,a056,a057,a058,a059,a060,a061,a062,a063,a064,a065,a066,a067,a068,a069,a070,a071,a072,a073,a074,a075,a076,a077,a078,a079,a080,a081,a082,a083,a084,a085,a086,a087,a088,a089,a090,a091,a092,a093,a094,a095,a096,a097,a098,a099,a100,a101,a102,a103,a104,a105,a106,a107,a108,a109,a110,a111,a112,a113,a114,a115,a116,a117,a118,a119;a001,a002,a003,a004,a005,a006,a007,a008,a009,a010,a011,a012,a013,a014,a015,a016,a017,a018,a019,a020,a021,a022,a023,a024,a025,a026,a027,a028,a029,a030,a031,a032,a033,a034,a035,a036,a037,a038,a039,a040,a041,a042,a043,a044,a045,a046,a047,a048,a049,a050,a051,a052,a053,a054,a055,a056,a057,a058,a059,a060,a061,a062,a063,a064,a065,a066,a067,a068,a069,a070,a071,a072,a073,a074,a075,a076,a077,a078,a079,a080,a081,a082,a083,a084,a085,a086,a087,a088,a089,a090,a091,a092,a093,a094,a095,a096,a097,a098,a099,a100,a101,a102,a103,a104,a105,a106,a107,a108,a109,a110,a111,a112,a113,a114,a115,a116,a117,a118,a119}`,
`name=function(){var a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z,_,$,aa,ba,ca,da,ea,fa,ga,ha,ia,ja,ka,la,ma,na,oa,pa,qa,ra,sa,ta,ua,va,wa,xa,ya,za,Aa,Ba,Ca,Da,Ea,Fa,Ga,Ha,Ia,Ja,Ka,La,Ma,Na,Oa,Pa,Qa,Ra,Sa,Ta,Ua,Va,Wa,Xa,Ya,Za,_a,$a,ab,bb,cb,db,eb,fb,gb,hb,ib,jb,kb;a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z,_,$,aa,ba,ca,da,ea,fa,ga,ha,ia,ja,ka,la,ma,na,oa,pa,qa,ra,sa,ta,ua,va,wa,xa,ya,za,Aa,Ba,Ca,Da,Ea,Fa,Ga,Ha,Ia,Ja,Ka,La,Ma,Na,Oa,Pa,Qa,Ra,Sa,Ta,Ua,Va,Wa,Xa,Ya,Za,_a,$a,ab,bb,cb,db,eb,fb,gb,hb,ib,jb,kb}`}, // 'as' is a keyword
{`a=>{for(let b of c){b,a;{var d}}}`, `a=>{for(let d of c){d,a;var b}}`}, // #334
//{`({x,y,z})=>x+y+z`, `({x,y,z})=>x+y+z`},
{`function f(a){let b=0;if(a===0){break}else{let b=3;b;break}}`, `function f(a){let c=0;if(a===0)break;let b=3;b;break}`}, // #405
{`!function(a){let b=0;if(a===0){break}else{let b=3;b;break}}`, `!function(a){let c=0;if(a===0)break;let b=3;b;break}`}, // #405
{`a=>{let b=0;if(a===0){break}else{let b=3;b;break}}`, `a=>{let c=0;if(a===0)break;let b=3;b;break}`}, // #405
{`{let b=0;if(a===0){break}else{let b=3;b;break}}`, `{let c=0;if(a===0)break;let b=3;b;break}`}, // #405
{`class x{f(a){let b=0;if(a===0){break}else{let b=3;b;break}}}`, `class x{f(a){let c=0;if(a===0)break;let b=3;b;break}}`}, // #405
{`for(;;){let b=0;if(a===0){break}else{let b=3;b;break}}`, `for(;;){let c=0;if(a===0)break;let b=3;b;break}`}, // #405
{`try{let b=0;if(a===0){break}else{let b=3;b;break}}catch{}`, `try{let c=0;if(a===0)break;let b=3;b;break}catch{}`}, // #405
{`let a=0;switch(a){case 0:let b=1;case 1:let c=2}`, `let a=0;switch(a){case 0:let a=1;case 1:let b=2}`},
{`({a:b=1}={})=>b`, `({a=1}={})=>a`}, // #422
{`()=>{var a;if(x){const b=0;while(true);}}`, `()=>{if(x){const b=0;for(var a;!0;);}}`},
{`(e,s)=>{e=>0,s(e(s))}`, `(a,b)=>{a=>0,b(a(b))}`}, // #469
{`()=>{var c;try {a} catch(b) {c}}`, `()=>{var b;try{a}catch{b}}`},
{`()=>{let foo;Math.abs(foo)}`, `()=>{let a;a<0?-a:a}`},
{`()=>{let foo;isNaN(foo)}`, `()=>{let a;isNaN(a)}`},
{`()=>{let isNaN;isNaN(foo)}`, `()=>{let a;a(foo)}`},
{`class a { #foo = 1; #bar() { this.#foo++ } }`, `class a{#a=1;#b(){this.#a++}}`},
{`export class a{#close(){}closeFirst(){x?.#close()}}`, `export class a{#a(){}closeFirst(){x?.#a()}}`},
// go-fuzz
{`var ÆÆ,ÆÆ=t;var ÆÆ=v,a=ÿ`, `var ÆÆ=t,ÆÆ=v,a=ÿ`},
}
m := minify.New()
o := Minifier{useAlphabetVarNames: true}
for _, tt := range jsTests {
t.Run(tt.js, func(t *testing.T) {
r := bytes.NewBufferString(tt.js)
w := &bytes.Buffer{}
err := o.Minify(m, w, r, nil)
test.Minify(t, tt.js, err, w.String(), tt.expected)
})
}
}
func TestJSVersion(t *testing.T) {
versions := []int{2022, 2020, 2019, 2018, 2014}
jsTests := []struct {
version int
js string
before string
after string
}{
{2020, `a==null?b:a`, `a==null?b:a`, `a??b`},
{2019, `try{}catch(a){}`, `try{}catch(a){}`, `try{}catch{}`},
{2015, `"<div `"<div "`<div >
}
m := minify.New()
for _, tt := range jsTests {
for _, version := range versions {
t.Run(fmt.Sprintf("%d/%v", version, tt.js), func(t *testing.T) {
r := bytes.NewBufferString(tt.js)
w := &bytes.Buffer{}
o := Minifier{KeepVarNames: true, useAlphabetVarNames: true, Version: version}
err := o.Minify(m, w, r, nil)
if version < tt.version {
test.Minify(t, tt.js, err, w.String(), tt.before)
} else {
test.Minify(t, tt.js, err, w.String(), tt.after)
}
})
}
}
}
func TestReaderError(t *testing.T) {
r := test.NewErrorReader(0)
w := &bytes.Buffer{}
m := minify.New()
err := Minify(m, w, r, nil)
test.T(t, err, test.ErrPlain)
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