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js_printer_test.go
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js_printer_test.go
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package js_printer
import (
"strings"
"testing"
"github.com/evanw/esbuild/internal/ast"
"github.com/evanw/esbuild/internal/compat"
"github.com/evanw/esbuild/internal/config"
"github.com/evanw/esbuild/internal/js_parser"
"github.com/evanw/esbuild/internal/logger"
"github.com/evanw/esbuild/internal/renamer"
"github.com/evanw/esbuild/internal/test"
)
func assertEqual(t *testing.T, a interface{}, b interface{}) {
t.Helper()
if a != b {
t.Fatalf("%s != %s", a, b)
}
}
func expectPrintedCommon(t *testing.T, name string, contents string, expected string, options config.Options) {
t.Helper()
t.Run(name, func(t *testing.T) {
t.Helper()
log := logger.NewDeferLog(logger.DeferLogNoVerboseOrDebug, nil)
tree, ok := js_parser.Parse(log, test.SourceForTest(contents), js_parser.OptionsFromConfig(&options))
msgs := log.Done()
text := ""
for _, msg := range msgs {
text += msg.String(logger.OutputOptions{}, logger.TerminalInfo{})
}
test.AssertEqualWithDiff(t, text, "")
if !ok {
t.Fatal("Parse error")
}
symbols := ast.NewSymbolMap(1)
symbols.SymbolsForSource[0] = tree.Symbols
r := renamer.NewNoOpRenamer(symbols)
js := Print(tree, symbols, r, Options{
ASCIIOnly: options.ASCIIOnly,
MinifySyntax: options.MinifySyntax,
MinifyWhitespace: options.MinifyWhitespace,
UnsupportedFeatures: options.UnsupportedJSFeatures,
}).JS
test.AssertEqualWithDiff(t, string(js), expected)
})
}
func expectPrinted(t *testing.T, contents string, expected string) {
t.Helper()
expectPrintedCommon(t, contents, contents, expected, config.Options{})
}
func expectPrintedMinify(t *testing.T, contents string, expected string) {
t.Helper()
expectPrintedCommon(t, contents+" [minified]", contents, expected, config.Options{
MinifyWhitespace: true,
})
}
func expectPrintedMangle(t *testing.T, contents string, expected string) {
t.Helper()
expectPrintedCommon(t, contents+" [mangled]", contents, expected, config.Options{
MinifySyntax: true,
})
}
func expectPrintedMangleMinify(t *testing.T, contents string, expected string) {
t.Helper()
expectPrintedCommon(t, contents+" [mangled, minified]", contents, expected, config.Options{
MinifySyntax: true,
MinifyWhitespace: true,
})
}
func expectPrintedASCII(t *testing.T, contents string, expected string) {
t.Helper()
expectPrintedCommon(t, contents+" [ascii]", contents, expected, config.Options{
ASCIIOnly: true,
})
}
func expectPrintedMinifyASCII(t *testing.T, contents string, expected string) {
t.Helper()
expectPrintedCommon(t, contents+" [ascii]", contents, expected, config.Options{
MinifyWhitespace: true,
ASCIIOnly: true,
})
}
func expectPrintedTarget(t *testing.T, esVersion int, contents string, expected string) {
t.Helper()
expectPrintedCommon(t, contents, contents, expected, config.Options{
UnsupportedJSFeatures: compat.UnsupportedJSFeatures(map[compat.Engine]compat.Semver{
compat.ES: {Parts: []int{esVersion}},
}),
})
}
func expectPrintedTargetMinify(t *testing.T, esVersion int, contents string, expected string) {
t.Helper()
expectPrintedCommon(t, contents+" [minified]", contents, expected, config.Options{
UnsupportedJSFeatures: compat.UnsupportedJSFeatures(map[compat.Engine]compat.Semver{
compat.ES: {Parts: []int{esVersion}},
}),
MinifyWhitespace: true,
})
}
func expectPrintedTargetMangle(t *testing.T, esVersion int, contents string, expected string) {
t.Helper()
expectPrintedCommon(t, contents+" [mangled]", contents, expected, config.Options{
UnsupportedJSFeatures: compat.UnsupportedJSFeatures(map[compat.Engine]compat.Semver{
compat.ES: {Parts: []int{esVersion}},
}),
MinifySyntax: true,
})
}
func expectPrintedTargetASCII(t *testing.T, esVersion int, contents string, expected string) {
t.Helper()
expectPrintedCommon(t, contents+" [ascii]", contents, expected, config.Options{
UnsupportedJSFeatures: compat.UnsupportedJSFeatures(map[compat.Engine]compat.Semver{
compat.ES: {Parts: []int{esVersion}},
}),
ASCIIOnly: true,
})
}
func expectPrintedJSX(t *testing.T, contents string, expected string) {
t.Helper()
expectPrintedCommon(t, contents, contents, expected, config.Options{
JSX: config.JSXOptions{
Parse: true,
Preserve: true,
},
})
}
func expectPrintedJSXASCII(t *testing.T, contents string, expected string) {
t.Helper()
expectPrintedCommon(t, contents, contents, expected, config.Options{
JSX: config.JSXOptions{
Parse: true,
Preserve: true,
},
ASCIIOnly: true,
})
}
func expectPrintedJSXMinify(t *testing.T, contents string, expected string) {
t.Helper()
expectPrintedCommon(t, contents+" [minified]", contents, expected, config.Options{
JSX: config.JSXOptions{
Parse: true,
Preserve: true,
},
MinifyWhitespace: true,
})
}
func TestNumber(t *testing.T) {
// Check "1eN"
expectPrinted(t, "x = 1e-100", "x = 1e-100;\n")
expectPrinted(t, "x = 1e-4", "x = 1e-4;\n")
expectPrinted(t, "x = 1e-3", "x = 1e-3;\n")
expectPrinted(t, "x = 1e-2", "x = 0.01;\n")
expectPrinted(t, "x = 1e-1", "x = 0.1;\n")
expectPrinted(t, "x = 1e0", "x = 1;\n")
expectPrinted(t, "x = 1e1", "x = 10;\n")
expectPrinted(t, "x = 1e2", "x = 100;\n")
expectPrinted(t, "x = 1e3", "x = 1e3;\n")
expectPrinted(t, "x = 1e4", "x = 1e4;\n")
expectPrinted(t, "x = 1e100", "x = 1e100;\n")
expectPrintedMinify(t, "x = 1e-100", "x=1e-100;")
expectPrintedMinify(t, "x = 1e-5", "x=1e-5;")
expectPrintedMinify(t, "x = 1e-4", "x=1e-4;")
expectPrintedMinify(t, "x = 1e-3", "x=.001;")
expectPrintedMinify(t, "x = 1e-2", "x=.01;")
expectPrintedMinify(t, "x = 1e-1", "x=.1;")
expectPrintedMinify(t, "x = 1e0", "x=1;")
expectPrintedMinify(t, "x = 1e1", "x=10;")
expectPrintedMinify(t, "x = 1e2", "x=100;")
expectPrintedMinify(t, "x = 1e3", "x=1e3;")
expectPrintedMinify(t, "x = 1e4", "x=1e4;")
expectPrintedMinify(t, "x = 1e100", "x=1e100;")
// Check "12eN"
expectPrinted(t, "x = 12e-100", "x = 12e-100;\n")
expectPrinted(t, "x = 12e-5", "x = 12e-5;\n")
expectPrinted(t, "x = 12e-4", "x = 12e-4;\n")
expectPrinted(t, "x = 12e-3", "x = 0.012;\n")
expectPrinted(t, "x = 12e-2", "x = 0.12;\n")
expectPrinted(t, "x = 12e-1", "x = 1.2;\n")
expectPrinted(t, "x = 12e0", "x = 12;\n")
expectPrinted(t, "x = 12e1", "x = 120;\n")
expectPrinted(t, "x = 12e2", "x = 1200;\n")
expectPrinted(t, "x = 12e3", "x = 12e3;\n")
expectPrinted(t, "x = 12e4", "x = 12e4;\n")
expectPrinted(t, "x = 12e100", "x = 12e100;\n")
expectPrintedMinify(t, "x = 12e-100", "x=12e-100;")
expectPrintedMinify(t, "x = 12e-6", "x=12e-6;")
expectPrintedMinify(t, "x = 12e-5", "x=12e-5;")
expectPrintedMinify(t, "x = 12e-4", "x=.0012;")
expectPrintedMinify(t, "x = 12e-3", "x=.012;")
expectPrintedMinify(t, "x = 12e-2", "x=.12;")
expectPrintedMinify(t, "x = 12e-1", "x=1.2;")
expectPrintedMinify(t, "x = 12e0", "x=12;")
expectPrintedMinify(t, "x = 12e1", "x=120;")
expectPrintedMinify(t, "x = 12e2", "x=1200;")
expectPrintedMinify(t, "x = 12e3", "x=12e3;")
expectPrintedMinify(t, "x = 12e4", "x=12e4;")
expectPrintedMinify(t, "x = 12e100", "x=12e100;")
// Check cases for "A.BeX" => "ABeY" simplification
expectPrinted(t, "x = 123456789", "x = 123456789;\n")
expectPrinted(t, "x = 1123456789", "x = 1123456789;\n")
expectPrinted(t, "x = 10123456789", "x = 10123456789;\n")
expectPrinted(t, "x = 100123456789", "x = 100123456789;\n")
expectPrinted(t, "x = 1000123456789", "x = 1000123456789;\n")
expectPrinted(t, "x = 10000123456789", "x = 10000123456789;\n")
expectPrinted(t, "x = 100000123456789", "x = 100000123456789;\n")
expectPrinted(t, "x = 1000000123456789", "x = 1000000123456789;\n")
expectPrinted(t, "x = 10000000123456789", "x = 10000000123456788;\n")
expectPrinted(t, "x = 100000000123456789", "x = 100000000123456780;\n")
expectPrinted(t, "x = 1000000000123456789", "x = 1000000000123456800;\n")
expectPrinted(t, "x = 10000000000123456789", "x = 10000000000123458e3;\n")
expectPrinted(t, "x = 100000000000123456789", "x = 10000000000012345e4;\n")
// Check numbers around the ends of various integer ranges. These were
// crashing in the WebAssembly build due to a bug in the Go runtime.
// int32
expectPrinted(t, "x = 0x7fff_ffff", "x = 2147483647;\n")
expectPrinted(t, "x = 0x8000_0000", "x = 2147483648;\n")
expectPrinted(t, "x = 0x8000_0001", "x = 2147483649;\n")
expectPrinted(t, "x = -0x7fff_ffff", "x = -2147483647;\n")
expectPrinted(t, "x = -0x8000_0000", "x = -2147483648;\n")
expectPrinted(t, "x = -0x8000_0001", "x = -2147483649;\n")
// uint32
expectPrinted(t, "x = 0xffff_ffff", "x = 4294967295;\n")
expectPrinted(t, "x = 0x1_0000_0000", "x = 4294967296;\n")
expectPrinted(t, "x = 0x1_0000_0001", "x = 4294967297;\n")
expectPrinted(t, "x = -0xffff_ffff", "x = -4294967295;\n")
expectPrinted(t, "x = -0x1_0000_0000", "x = -4294967296;\n")
expectPrinted(t, "x = -0x1_0000_0001", "x = -4294967297;\n")
// int64
expectPrinted(t, "x = 0x7fff_ffff_ffff_fdff", "x = 9223372036854775e3;\n")
expectPrinted(t, "x = 0x8000_0000_0000_0000", "x = 9223372036854776e3;\n")
expectPrinted(t, "x = 0x8000_0000_0000_3000", "x = 9223372036854788e3;\n")
expectPrinted(t, "x = -0x7fff_ffff_ffff_fdff", "x = -9223372036854775e3;\n")
expectPrinted(t, "x = -0x8000_0000_0000_0000", "x = -9223372036854776e3;\n")
expectPrinted(t, "x = -0x8000_0000_0000_3000", "x = -9223372036854788e3;\n")
// uint64
expectPrinted(t, "x = 0xffff_ffff_ffff_fbff", "x = 1844674407370955e4;\n")
expectPrinted(t, "x = 0x1_0000_0000_0000_0000", "x = 18446744073709552e3;\n")
expectPrinted(t, "x = 0x1_0000_0000_0000_1000", "x = 18446744073709556e3;\n")
expectPrinted(t, "x = -0xffff_ffff_ffff_fbff", "x = -1844674407370955e4;\n")
expectPrinted(t, "x = -0x1_0000_0000_0000_0000", "x = -18446744073709552e3;\n")
expectPrinted(t, "x = -0x1_0000_0000_0000_1000", "x = -18446744073709556e3;\n")
// Check the hex vs. decimal decision boundary when minifying
expectPrinted(t, "x = 999999999999", "x = 999999999999;\n")
expectPrinted(t, "x = 1000000000001", "x = 1000000000001;\n")
expectPrinted(t, "x = 0x0FFF_FFFF_FFFF_FF80", "x = 1152921504606846800;\n")
expectPrinted(t, "x = 0x1000_0000_0000_0000", "x = 1152921504606847e3;\n")
expectPrinted(t, "x = 0xFFFF_FFFF_FFFF_F000", "x = 18446744073709548e3;\n")
expectPrinted(t, "x = 0xFFFF_FFFF_FFFF_F800", "x = 1844674407370955e4;\n")
expectPrinted(t, "x = 0xFFFF_FFFF_FFFF_FFFF", "x = 18446744073709552e3;\n")
expectPrintedMinify(t, "x = 999999999999", "x=999999999999;")
expectPrintedMinify(t, "x = 1000000000001", "x=0xe8d4a51001;")
expectPrintedMinify(t, "x = 0x0FFF_FFFF_FFFF_FF80", "x=0xfffffffffffff80;")
expectPrintedMinify(t, "x = 0x1000_0000_0000_0000", "x=1152921504606847e3;")
expectPrintedMinify(t, "x = 0xFFFF_FFFF_FFFF_F000", "x=0xfffffffffffff000;")
expectPrintedMinify(t, "x = 0xFFFF_FFFF_FFFF_F800", "x=1844674407370955e4;")
expectPrintedMinify(t, "x = 0xFFFF_FFFF_FFFF_FFFF", "x=18446744073709552e3;")
// Check printing a space in between a number and a subsequent "."
expectPrintedMinify(t, "x = 0.0001 .y", "x=1e-4.y;")
expectPrintedMinify(t, "x = 0.001 .y", "x=.001.y;")
expectPrintedMinify(t, "x = 0.01 .y", "x=.01.y;")
expectPrintedMinify(t, "x = 0.1 .y", "x=.1.y;")
expectPrintedMinify(t, "x = 0 .y", "x=0 .y;")
expectPrintedMinify(t, "x = 10 .y", "x=10 .y;")
expectPrintedMinify(t, "x = 100 .y", "x=100 .y;")
expectPrintedMinify(t, "x = 1000 .y", "x=1e3.y;")
expectPrintedMinify(t, "x = 12345 .y", "x=12345 .y;")
expectPrintedMinify(t, "x = 0xFFFF_0000_FFFF_0000 .y", "x=0xffff0000ffff0000.y;")
}
func TestArray(t *testing.T) {
expectPrinted(t, "[]", "[];\n")
expectPrinted(t, "[,]", "[,];\n")
expectPrinted(t, "[,,]", "[, ,];\n")
}
func TestSplat(t *testing.T) {
expectPrinted(t, "[...(a, b)]", "[...(a, b)];\n")
expectPrinted(t, "x(...(a, b))", "x(...(a, b));\n")
expectPrinted(t, "({...(a, b)})", "({ ...(a, b) });\n")
}
func TestNew(t *testing.T) {
expectPrinted(t, "new x", "new x();\n")
expectPrinted(t, "new x()", "new x();\n")
expectPrinted(t, "new (x)", "new x();\n")
expectPrinted(t, "new (x())", "new (x())();\n")
expectPrinted(t, "new (new x())", "new new x()();\n")
expectPrinted(t, "new (x + x)", "new (x + x)();\n")
expectPrinted(t, "(new x)()", "new x()();\n")
expectPrinted(t, "new foo().bar", "new foo().bar;\n")
expectPrinted(t, "new (foo().bar)", "new (foo()).bar();\n")
expectPrinted(t, "new (foo()).bar", "new (foo()).bar();\n")
expectPrinted(t, "new foo()[bar]", "new foo()[bar];\n")
expectPrinted(t, "new (foo()[bar])", "new (foo())[bar]();\n")
expectPrinted(t, "new (foo())[bar]", "new (foo())[bar]();\n")
expectPrinted(t, "new (import('foo').bar)", "new (import(\"foo\")).bar();\n")
expectPrinted(t, "new (import('foo')).bar", "new (import(\"foo\")).bar();\n")
expectPrinted(t, "new (import('foo')[bar])", "new (import(\"foo\"))[bar]();\n")
expectPrinted(t, "new (import('foo'))[bar]", "new (import(\"foo\"))[bar]();\n")
expectPrintedMinify(t, "new x", "new x;")
expectPrintedMinify(t, "new x.y", "new x.y;")
expectPrintedMinify(t, "(new x).y", "new x().y;")
expectPrintedMinify(t, "new x().y", "new x().y;")
expectPrintedMinify(t, "new x() + y", "new x+y;")
expectPrintedMinify(t, "new x() ** 2", "new x**2;")
// Test preservation of Webpack-specific comments
expectPrinted(t, "new Worker(// webpackFoo: 1\n // webpackBar: 2\n 'path');", "new Worker(\n // webpackFoo: 1\n // webpackBar: 2\n \"path\"\n);\n")
expectPrinted(t, "new Worker(/* webpackFoo: 1 */ /* webpackBar: 2 */ 'path');", "new Worker(\n /* webpackFoo: 1 */\n /* webpackBar: 2 */\n \"path\"\n);\n")
expectPrinted(t, "new Worker(\n /* multi\n * line\n * webpackBar: */ 'path');", "new Worker(\n /* multi\n * line\n * webpackBar: */\n \"path\"\n);\n")
expectPrinted(t, "new Worker(/* webpackFoo: 1 */ 'path' /* webpackBar:2 */);", "new Worker(\n /* webpackFoo: 1 */\n \"path\"\n /* webpackBar:2 */\n);\n")
expectPrinted(t, "new Worker(/* webpackFoo: 1 */ 'path' /* webpackBar:2 */ ,);", "new Worker(\n /* webpackFoo: 1 */\n \"path\"\n);\n") // Not currently handled
expectPrinted(t, "new Worker(/* webpackFoo: 1 */ 'path', /* webpackBar:2 */ );", "new Worker(\n /* webpackFoo: 1 */\n \"path\"\n /* webpackBar:2 */\n);\n")
expectPrinted(t, "new Worker(new URL('path', /* webpackFoo: these can go anywhere */ import.meta.url))",
"new Worker(new URL(\n \"path\",\n /* webpackFoo: these can go anywhere */\n import.meta.url\n));\n")
}
func TestCall(t *testing.T) {
expectPrinted(t, "x()()()", "x()()();\n")
expectPrinted(t, "x().y()[z]()", "x().y()[z]();\n")
expectPrinted(t, "(--x)();", "(--x)();\n")
expectPrinted(t, "(x--)();", "(x--)();\n")
expectPrinted(t, "eval(x)", "eval(x);\n")
expectPrinted(t, "eval?.(x)", "eval?.(x);\n")
expectPrinted(t, "(eval)(x)", "eval(x);\n")
expectPrinted(t, "(eval)?.(x)", "eval?.(x);\n")
expectPrinted(t, "eval(x, y)", "eval(x, y);\n")
expectPrinted(t, "eval?.(x, y)", "eval?.(x, y);\n")
expectPrinted(t, "(1, eval)(x)", "(1, eval)(x);\n")
expectPrinted(t, "(1, eval)?.(x)", "(1, eval)?.(x);\n")
expectPrintedMangle(t, "(1 ? eval : 2)(x)", "(0, eval)(x);\n")
expectPrintedMangle(t, "(1 ? eval : 2)?.(x)", "eval?.(x);\n")
expectPrintedMinify(t, "eval?.(x)", "eval?.(x);")
expectPrintedMinify(t, "eval(x,y)", "eval(x,y);")
expectPrintedMinify(t, "eval?.(x,y)", "eval?.(x,y);")
expectPrintedMinify(t, "(1, eval)(x)", "(1,eval)(x);")
expectPrintedMinify(t, "(1, eval)?.(x)", "(1,eval)?.(x);")
expectPrintedMangleMinify(t, "(1 ? eval : 2)(x)", "(0,eval)(x);")
expectPrintedMangleMinify(t, "(1 ? eval : 2)?.(x)", "eval?.(x);")
}
func TestMember(t *testing.T) {
expectPrinted(t, "x.y[z]", "x.y[z];\n")
expectPrinted(t, "((x+1).y+1)[z]", "((x + 1).y + 1)[z];\n")
}
func TestComma(t *testing.T) {
expectPrinted(t, "1, 2, 3", "1, 2, 3;\n")
expectPrinted(t, "(1, 2), 3", "1, 2, 3;\n")
expectPrinted(t, "1, (2, 3)", "1, 2, 3;\n")
expectPrinted(t, "a ? (b, c) : (d, e)", "a ? (b, c) : (d, e);\n")
expectPrinted(t, "let x = (a, b)", "let x = (a, b);\n")
expectPrinted(t, "(x = a), b", "x = a, b;\n")
expectPrinted(t, "x = (a, b)", "x = (a, b);\n")
expectPrinted(t, "x((1, 2))", "x((1, 2));\n")
}
func TestUnary(t *testing.T) {
expectPrinted(t, "+(x--)", "+x--;\n")
expectPrinted(t, "-(x++)", "-x++;\n")
}
func TestNullish(t *testing.T) {
// "??" can't directly contain "||" or "&&"
expectPrinted(t, "(a && b) ?? c", "(a && b) ?? c;\n")
expectPrinted(t, "(a || b) ?? c", "(a || b) ?? c;\n")
expectPrinted(t, "a ?? (b && c)", "a ?? (b && c);\n")
expectPrinted(t, "a ?? (b || c)", "a ?? (b || c);\n")
// "||" and "&&" can't directly contain "??"
expectPrinted(t, "a && (b ?? c)", "a && (b ?? c);\n")
expectPrinted(t, "a || (b ?? c)", "a || (b ?? c);\n")
expectPrinted(t, "(a ?? b) && c", "(a ?? b) && c;\n")
expectPrinted(t, "(a ?? b) || c", "(a ?? b) || c;\n")
}
func TestString(t *testing.T) {
expectPrinted(t, "let x = ''", "let x = \"\";\n")
expectPrinted(t, "let x = '\b'", "let x = \"\\b\";\n")
expectPrinted(t, "let x = '\f'", "let x = \"\\f\";\n")
expectPrinted(t, "let x = '\t'", "let x = \"\t\";\n")
expectPrinted(t, "let x = '\v'", "let x = \"\\v\";\n")
expectPrinted(t, "let x = '\\n'", "let x = \"\\n\";\n")
expectPrinted(t, "let x = '\\''", "let x = \"'\";\n")
expectPrinted(t, "let x = '\\\"'", "let x = '\"';\n")
expectPrinted(t, "let x = '\\'\"'", "let x = `'\"`;\n")
expectPrinted(t, "let x = '\\\\'", "let x = \"\\\\\";\n")
expectPrinted(t, "let x = '\x00'", "let x = \"\\0\";\n")
expectPrinted(t, "let x = '\x00!'", "let x = \"\\0!\";\n")
expectPrinted(t, "let x = '\x001'", "let x = \"\\x001\";\n")
expectPrinted(t, "let x = '\\0'", "let x = \"\\0\";\n")
expectPrinted(t, "let x = '\\0!'", "let x = \"\\0!\";\n")
expectPrinted(t, "let x = '\x07'", "let x = \"\\x07\";\n")
expectPrinted(t, "let x = '\x07!'", "let x = \"\\x07!\";\n")
expectPrinted(t, "let x = '\x071'", "let x = \"\\x071\";\n")
expectPrinted(t, "let x = '\\7'", "let x = \"\\x07\";\n")
expectPrinted(t, "let x = '\\7!'", "let x = \"\\x07!\";\n")
expectPrinted(t, "let x = '\\01'", "let x = \"\x01\";\n")
expectPrinted(t, "let x = '\x10'", "let x = \"\x10\";\n")
expectPrinted(t, "let x = '\\x10'", "let x = \"\x10\";\n")
expectPrinted(t, "let x = '\x1B'", "let x = \"\\x1B\";\n")
expectPrinted(t, "let x = '\\x1B'", "let x = \"\\x1B\";\n")
expectPrinted(t, "let x = '\uABCD'", "let x = \"\uABCD\";\n")
expectPrinted(t, "let x = '\\uABCD'", "let x = \"\uABCD\";\n")
expectPrinted(t, "let x = '\U000123AB'", "let x = \"\U000123AB\";\n")
expectPrinted(t, "let x = '\\u{123AB}'", "let x = \"\U000123AB\";\n")
expectPrinted(t, "let x = '\\uD808\\uDFAB'", "let x = \"\U000123AB\";\n")
expectPrinted(t, "let x = '\\uD808'", "let x = \"\\uD808\";\n")
expectPrinted(t, "let x = '\\uD808X'", "let x = \"\\uD808X\";\n")
expectPrinted(t, "let x = '\\uDFAB'", "let x = \"\\uDFAB\";\n")
expectPrinted(t, "let x = '\\uDFABX'", "let x = \"\\uDFABX\";\n")
expectPrinted(t, "let x = '\\x80'", "let x = \"\U00000080\";\n")
expectPrinted(t, "let x = '\\xFF'", "let x = \"\U000000FF\";\n")
expectPrinted(t, "let x = '\\xF0\\x9F\\x8D\\x95'", "let x = \"\U000000F0\U0000009F\U0000008D\U00000095\";\n")
expectPrinted(t, "let x = '\\uD801\\uDC02\\uDC03\\uD804'", "let x = \"\U00010402\\uDC03\\uD804\";\n")
}
func TestTemplate(t *testing.T) {
expectPrinted(t, "let x = `\\0`", "let x = `\\0`;\n")
expectPrinted(t, "let x = `\\x01`", "let x = `\x01`;\n")
expectPrinted(t, "let x = `\\0${0}`", "let x = `\\0${0}`;\n")
expectPrinted(t, "let x = `\\x01${0}`", "let x = `\x01${0}`;\n")
expectPrinted(t, "let x = `${0}\\0`", "let x = `${0}\\0`;\n")
expectPrinted(t, "let x = `${0}\\x01`", "let x = `${0}\x01`;\n")
expectPrinted(t, "let x = `${0}\\0${1}`", "let x = `${0}\\0${1}`;\n")
expectPrinted(t, "let x = `${0}\\x01${1}`", "let x = `${0}\x01${1}`;\n")
expectPrinted(t, "let x = String.raw`\\1`", "let x = String.raw`\\1`;\n")
expectPrinted(t, "let x = String.raw`\\x01`", "let x = String.raw`\\x01`;\n")
expectPrinted(t, "let x = String.raw`\\1${0}`", "let x = String.raw`\\1${0}`;\n")
expectPrinted(t, "let x = String.raw`\\x01${0}`", "let x = String.raw`\\x01${0}`;\n")
expectPrinted(t, "let x = String.raw`${0}\\1`", "let x = String.raw`${0}\\1`;\n")
expectPrinted(t, "let x = String.raw`${0}\\x01`", "let x = String.raw`${0}\\x01`;\n")
expectPrinted(t, "let x = String.raw`${0}\\1${1}`", "let x = String.raw`${0}\\1${1}`;\n")
expectPrinted(t, "let x = String.raw`${0}\\x01${1}`", "let x = String.raw`${0}\\x01${1}`;\n")
expectPrinted(t, "let x = `${y}`", "let x = `${y}`;\n")
expectPrinted(t, "let x = `$(y)`", "let x = `$(y)`;\n")
expectPrinted(t, "let x = `{y}$`", "let x = `{y}$`;\n")
expectPrinted(t, "let x = `$}y{`", "let x = `$}y{`;\n")
expectPrinted(t, "let x = `\\${y}`", "let x = `\\${y}`;\n")
expectPrinted(t, "let x = `$\\{y}`", "let x = `\\${y}`;\n")
expectPrinted(t, "await tag`x`", "await tag`x`;\n")
expectPrinted(t, "await (tag`x`)", "await tag`x`;\n")
expectPrinted(t, "(await tag)`x`", "(await tag)`x`;\n")
expectPrinted(t, "await tag`${x}`", "await tag`${x}`;\n")
expectPrinted(t, "await (tag`${x}`)", "await tag`${x}`;\n")
expectPrinted(t, "(await tag)`${x}`", "(await tag)`${x}`;\n")
expectPrinted(t, "new tag`x`", "new tag`x`();\n")
expectPrinted(t, "new (tag`x`)", "new tag`x`();\n")
expectPrinted(t, "new tag()`x`", "new tag()`x`;\n")
expectPrinted(t, "(new tag)`x`", "new tag()`x`;\n")
expectPrintedMinify(t, "new tag`x`", "new tag`x`;")
expectPrintedMinify(t, "new (tag`x`)", "new tag`x`;")
expectPrintedMinify(t, "new tag()`x`", "new tag()`x`;")
expectPrintedMinify(t, "(new tag)`x`", "new tag()`x`;")
expectPrinted(t, "new tag`${x}`", "new tag`${x}`();\n")
expectPrinted(t, "new (tag`${x}`)", "new tag`${x}`();\n")
expectPrinted(t, "new tag()`${x}`", "new tag()`${x}`;\n")
expectPrinted(t, "(new tag)`${x}`", "new tag()`${x}`;\n")
expectPrintedMinify(t, "new tag`${x}`", "new tag`${x}`;")
expectPrintedMinify(t, "new (tag`${x}`)", "new tag`${x}`;")
expectPrintedMinify(t, "new tag()`${x}`", "new tag()`${x}`;")
expectPrintedMinify(t, "(new tag)`${x}`", "new tag()`${x}`;")
}
func TestObject(t *testing.T) {
expectPrinted(t, "let x = {'(':')'}", "let x = { \"(\": \")\" };\n")
expectPrinted(t, "({})", "({});\n")
expectPrinted(t, "({}.x)", "({}).x;\n")
expectPrinted(t, "({} = {})", "({} = {});\n")
expectPrinted(t, "(x, {} = {})", "x, {} = {};\n")
expectPrinted(t, "let x = () => ({})", "let x = () => ({});\n")
expectPrinted(t, "let x = () => ({}.x)", "let x = () => ({}).x;\n")
expectPrinted(t, "let x = () => ({} = {})", "let x = () => ({} = {});\n")
expectPrinted(t, "let x = () => (x, {} = {})", "let x = () => (x, {} = {});\n")
}
func TestFor(t *testing.T) {
// Make sure "in" expressions are forbidden in the right places
expectPrinted(t, "for ((a in b);;);", "for ((a in b); ; )\n ;\n")
expectPrinted(t, "for (a ? b : (c in d);;);", "for (a ? b : (c in d); ; )\n ;\n")
expectPrinted(t, "for ((a ? b : c in d).foo;;);", "for ((a ? b : c in d).foo; ; )\n ;\n")
expectPrinted(t, "for (var x = (a in b);;);", "for (var x = (a in b); ; )\n ;\n")
expectPrinted(t, "for (x = (a in b);;);", "for (x = (a in b); ; )\n ;\n")
expectPrinted(t, "for (x == (a in b);;);", "for (x == (a in b); ; )\n ;\n")
expectPrinted(t, "for (1 * (x == a in b);;);", "for (1 * (x == a in b); ; )\n ;\n")
expectPrinted(t, "for (a ? b : x = (c in d);;);", "for (a ? b : x = (c in d); ; )\n ;\n")
expectPrinted(t, "for (var x = y = (a in b);;);", "for (var x = y = (a in b); ; )\n ;\n")
expectPrinted(t, "for ([a in b];;);", "for ([a in b]; ; )\n ;\n")
expectPrinted(t, "for (x(a in b);;);", "for (x(a in b); ; )\n ;\n")
expectPrinted(t, "for (x[a in b];;);", "for (x[a in b]; ; )\n ;\n")
expectPrinted(t, "for (x?.[a in b];;);", "for (x?.[a in b]; ; )\n ;\n")
expectPrinted(t, "for ((x => a in b);;);", "for ((x) => (a in b); ; )\n ;\n")
// Make sure for-of loops with commas are wrapped in parentheses
expectPrinted(t, "for (let a in b, c);", "for (let a in b, c)\n ;\n")
expectPrinted(t, "for (let a of (b, c));", "for (let a of (b, c))\n ;\n")
}
func TestFunction(t *testing.T) {
expectPrinted(t,
"function foo(a = (b, c), ...d) {}",
"function foo(a = (b, c), ...d) {\n}\n")
expectPrinted(t,
"function foo({[1 + 2]: a = 3} = {[1 + 2]: 3}) {}",
"function foo({ [1 + 2]: a = 3 } = { [1 + 2]: 3 }) {\n}\n")
expectPrinted(t,
"function foo([a = (1, 2), ...[b, ...c]] = [1, [2, 3]]) {}",
"function foo([a = (1, 2), ...[b, ...c]] = [1, [2, 3]]) {\n}\n")
expectPrinted(t,
"function foo([] = []) {}",
"function foo([] = []) {\n}\n")
expectPrinted(t,
"function foo([,] = [,]) {}",
"function foo([,] = [,]) {\n}\n")
expectPrinted(t,
"function foo([,,] = [,,]) {}",
"function foo([, ,] = [, ,]) {\n}\n")
}
func TestCommentsAndParentheses(t *testing.T) {
expectPrinted(t, "(/* foo */ { x() { foo() } }.x());", "/* foo */\n({ x() {\n foo();\n} }).x();\n")
expectPrinted(t, "(/* foo */ function f() { foo(f) }());", "/* foo */\n(function f() {\n foo(f);\n})();\n")
expectPrinted(t, "(/* foo */ class x { static y() { foo(x) } }.y());", "/* foo */\n(class x {\n static y() {\n foo(x);\n }\n}).y();\n")
expectPrinted(t, "(/* @__PURE__ */ (() => foo())());", "/* @__PURE__ */ (() => foo())();\n")
expectPrinted(t, "export default (/* foo */ function f() {});", "export default (\n /* foo */\n function f() {\n }\n);\n")
expectPrinted(t, "export default (/* foo */ class x {});", "export default (\n /* foo */\n class x {\n }\n);\n")
expectPrinted(t, "x = () => (/* foo */ {});", "x = () => (\n /* foo */\n {}\n);\n")
expectPrinted(t, "for ((/* foo */ let).x of y) ;", "for (\n /* foo */\n (let).x of y\n)\n ;\n")
expectPrinted(t, "for (/* foo */ (let).x of y) ;", "for (\n /* foo */\n (let).x of y\n)\n ;\n")
expectPrinted(t, "function *x() { yield (/* foo */ y) }", "function* x() {\n yield (\n /* foo */\n y\n );\n}\n")
}
func TestPureComment(t *testing.T) {
expectPrinted(t,
"(function() { foo() })",
"(function() {\n foo();\n});\n")
expectPrinted(t,
"(function() { foo() })()",
"(function() {\n foo();\n})();\n")
expectPrinted(t,
"/*@__PURE__*/(function() { foo() })()",
"/* @__PURE__ */ (function() {\n foo();\n})();\n")
expectPrinted(t,
"new (function() {})",
"new function() {\n}();\n")
expectPrinted(t,
"new (function() {})()",
"new function() {\n}();\n")
expectPrinted(t,
"/*@__PURE__*/new (function() {})()",
"/* @__PURE__ */ new function() {\n}();\n")
expectPrinted(t,
"export default (function() { foo() })",
"export default (function() {\n foo();\n});\n")
expectPrinted(t,
"export default (function() { foo() })()",
"export default (function() {\n foo();\n})();\n")
expectPrinted(t,
"export default /*@__PURE__*/(function() { foo() })()",
"export default /* @__PURE__ */ (function() {\n foo();\n})();\n")
}
func TestGenerator(t *testing.T) {
expectPrinted(t,
"function* foo() {}",
"function* foo() {\n}\n")
expectPrinted(t,
"(function* () {})",
"(function* () {\n});\n")
expectPrinted(t,
"(function* foo() {})",
"(function* foo() {\n});\n")
expectPrinted(t,
"class Foo { *foo() {} }",
"class Foo {\n *foo() {\n }\n}\n")
expectPrinted(t,
"class Foo { static *foo() {} }",
"class Foo {\n static *foo() {\n }\n}\n")
expectPrinted(t,
"class Foo { *[foo]() {} }",
"class Foo {\n *[foo]() {\n }\n}\n")
expectPrinted(t,
"class Foo { static *[foo]() {} }",
"class Foo {\n static *[foo]() {\n }\n}\n")
expectPrinted(t,
"(class { *foo() {} })",
"(class {\n *foo() {\n }\n});\n")
expectPrinted(t,
"(class { static *foo() {} })",
"(class {\n static *foo() {\n }\n});\n")
expectPrinted(t,
"(class { *[foo]() {} })",
"(class {\n *[foo]() {\n }\n});\n")
expectPrinted(t,
"(class { static *[foo]() {} })",
"(class {\n static *[foo]() {\n }\n});\n")
}
func TestArrow(t *testing.T) {
expectPrinted(t, "() => {}", "() => {\n};\n")
expectPrinted(t, "x => (x, 0)", "(x) => (x, 0);\n")
expectPrinted(t, "x => {y}", "(x) => {\n y;\n};\n")
expectPrinted(t,
"(a = (b, c), ...d) => {}",
"(a = (b, c), ...d) => {\n};\n")
expectPrinted(t,
"({[1 + 2]: a = 3} = {[1 + 2]: 3}) => {}",
"({ [1 + 2]: a = 3 } = { [1 + 2]: 3 }) => {\n};\n")
expectPrinted(t,
"([a = (1, 2), ...[b, ...c]] = [1, [2, 3]]) => {}",
"([a = (1, 2), ...[b, ...c]] = [1, [2, 3]]) => {\n};\n")
expectPrinted(t,
"([] = []) => {}",
"([] = []) => {\n};\n")
expectPrinted(t,
"([,] = [,]) => {}",
"([,] = [,]) => {\n};\n")
expectPrinted(t,
"([,,] = [,,]) => {}",
"([, ,] = [, ,]) => {\n};\n")
expectPrinted(t,
"a = () => {}",
"a = () => {\n};\n")
expectPrinted(t,
"a || (() => {})",
"a || (() => {\n});\n")
expectPrinted(t,
"({a = b, c = d}) => {}",
"({ a = b, c = d }) => {\n};\n")
expectPrinted(t,
"([{a = b, c = d} = {}] = []) => {}",
"([{ a = b, c = d } = {}] = []) => {\n};\n")
expectPrinted(t,
"({a: [b = c] = []} = {}) => {}",
"({ a: [b = c] = [] } = {}) => {\n};\n")
// These are not arrow functions but initially look like one
expectPrinted(t, "(a = b, c)", "a = b, c;\n")
expectPrinted(t, "([...a = b])", "[...a = b];\n")
expectPrinted(t, "([...a, ...b])", "[...a, ...b];\n")
expectPrinted(t, "({a: b, c() {}})", "({ a: b, c() {\n} });\n")
expectPrinted(t, "({a: b, get c() {}})", "({ a: b, get c() {\n} });\n")
expectPrinted(t, "({a: b, set c(x) {}})", "({ a: b, set c(x) {\n} });\n")
}
func TestClass(t *testing.T) {
expectPrinted(t, "class Foo extends (a, b) {}", "class Foo extends (a, b) {\n}\n")
expectPrinted(t, "class Foo { get foo() {} }", "class Foo {\n get foo() {\n }\n}\n")
expectPrinted(t, "class Foo { set foo(x) {} }", "class Foo {\n set foo(x) {\n }\n}\n")
expectPrinted(t, "class Foo { static foo() {} }", "class Foo {\n static foo() {\n }\n}\n")
expectPrinted(t, "class Foo { static get foo() {} }", "class Foo {\n static get foo() {\n }\n}\n")
expectPrinted(t, "class Foo { static set foo(x) {} }", "class Foo {\n static set foo(x) {\n }\n}\n")
}
func TestAutoAccessors(t *testing.T) {
expectPrinted(t, "class Foo { accessor x; static accessor y }", "class Foo {\n accessor x;\n static accessor y;\n}\n")
expectPrinted(t, "class Foo { accessor [x]; static accessor [y] }", "class Foo {\n accessor [x];\n static accessor [y];\n}\n")
expectPrintedMinify(t, "class Foo { accessor x; static accessor y }", "class Foo{accessor x;static accessor y}")
expectPrintedMinify(t, "class Foo { accessor [x]; static accessor [y] }", "class Foo{accessor[x];static accessor[y]}")
}
func TestPrivateIdentifiers(t *testing.T) {
expectPrinted(t, "class Foo { #foo; foo() { return #foo in this } }", "class Foo {\n #foo;\n foo() {\n return #foo in this;\n }\n}\n")
expectPrintedMinify(t, "class Foo { #foo; foo() { return #foo in this } }", "class Foo{#foo;foo(){return#foo in this}}")
}
func TestImport(t *testing.T) {
expectPrinted(t, "import('path');", "import(\"path\");\n") // The semicolon must not be a separate statement
// Test preservation of Webpack-specific comments
expectPrinted(t, "import(// webpackFoo: 1\n // webpackBar: 2\n 'path');", "import(\n // webpackFoo: 1\n // webpackBar: 2\n \"path\"\n);\n")
expectPrinted(t, "import(// webpackFoo: 1\n // webpackBar: 2\n 'path', {type: 'module'});", "import(\n // webpackFoo: 1\n // webpackBar: 2\n \"path\",\n { type: \"module\" }\n);\n")
expectPrinted(t, "import(/* webpackFoo: 1 */ /* webpackBar: 2 */ 'path');", "import(\n /* webpackFoo: 1 */\n /* webpackBar: 2 */\n \"path\"\n);\n")
expectPrinted(t, "import(/* webpackFoo: 1 */ /* webpackBar: 2 */ 'path', {type: 'module'});", "import(\n /* webpackFoo: 1 */\n /* webpackBar: 2 */\n \"path\",\n { type: \"module\" }\n);\n")
expectPrinted(t, "import(\n /* multi\n * line\n * webpackBar: */ 'path');", "import(\n /* multi\n * line\n * webpackBar: */\n \"path\"\n);\n")
expectPrinted(t, "import(/* webpackFoo: 1 */ 'path' /* webpackBar:2 */);", "import(\n /* webpackFoo: 1 */\n \"path\"\n /* webpackBar:2 */\n);\n")
expectPrinted(t, "import(/* webpackFoo: 1 */ 'path' /* webpackBar:2 */ ,);", "import(\n /* webpackFoo: 1 */\n \"path\"\n);\n") // Not currently handled
expectPrinted(t, "import(/* webpackFoo: 1 */ 'path', /* webpackBar:2 */ );", "import(\n /* webpackFoo: 1 */\n \"path\"\n /* webpackBar:2 */\n);\n")
expectPrinted(t, "import(/* webpackFoo: 1 */ 'path', { type: 'module' } /* webpackBar:2 */ );", "import(\n /* webpackFoo: 1 */\n \"path\",\n { type: \"module\" }\n /* webpackBar:2 */\n);\n")
expectPrinted(t, "import(new URL('path', /* webpackFoo: these can go anywhere */ import.meta.url))",
"import(new URL(\n \"path\",\n /* webpackFoo: these can go anywhere */\n import.meta.url\n));\n")
}
func TestExportDefault(t *testing.T) {
expectPrinted(t, "export default function() {}", "export default function() {\n}\n")
expectPrinted(t, "export default function foo() {}", "export default function foo() {\n}\n")
expectPrinted(t, "export default async function() {}", "export default async function() {\n}\n")
expectPrinted(t, "export default async function foo() {}", "export default async function foo() {\n}\n")
expectPrinted(t, "export default class {}", "export default class {\n}\n")
expectPrinted(t, "export default class foo {}", "export default class foo {\n}\n")
expectPrinted(t, "export default (function() {})", "export default (function() {\n});\n")
expectPrinted(t, "export default (function foo() {})", "export default (function foo() {\n});\n")
expectPrinted(t, "export default (async function() {})", "export default (async function() {\n});\n")
expectPrinted(t, "export default (async function foo() {})", "export default (async function foo() {\n});\n")
expectPrinted(t, "export default (class {})", "export default (class {\n});\n")
expectPrinted(t, "export default (class foo {})", "export default (class foo {\n});\n")
expectPrinted(t, "export default (function() {}.toString())", "export default (function() {\n}).toString();\n")
expectPrinted(t, "export default (function foo() {}.toString())", "export default (function foo() {\n}).toString();\n")
expectPrinted(t, "export default (async function() {}.toString())", "export default (async function() {\n}).toString();\n")
expectPrinted(t, "export default (async function foo() {}.toString())", "export default (async function foo() {\n}).toString();\n")
expectPrinted(t, "export default (class {}.toString())", "export default (class {\n}).toString();\n")
expectPrinted(t, "export default (class foo {}.toString())", "export default (class foo {\n}).toString();\n")
expectPrintedMinify(t, "export default function() {}", "export default function(){}")
expectPrintedMinify(t, "export default function foo() {}", "export default function foo(){}")
expectPrintedMinify(t, "export default async function() {}", "export default async function(){}")
expectPrintedMinify(t, "export default async function foo() {}", "export default async function foo(){}")
expectPrintedMinify(t, "export default class {}", "export default class{}")
expectPrintedMinify(t, "export default class foo {}", "export default class foo{}")
}
func TestWhitespace(t *testing.T) {
expectPrinted(t, "- -x", "- -x;\n")
expectPrinted(t, "+ -x", "+-x;\n")
expectPrinted(t, "- +x", "-+x;\n")
expectPrinted(t, "+ +x", "+ +x;\n")
expectPrinted(t, "- --x", "- --x;\n")
expectPrinted(t, "+ --x", "+--x;\n")
expectPrinted(t, "- ++x", "-++x;\n")
expectPrinted(t, "+ ++x", "+ ++x;\n")
expectPrintedMinify(t, "- -x", "- -x;")
expectPrintedMinify(t, "+ -x", "+-x;")
expectPrintedMinify(t, "- +x", "-+x;")
expectPrintedMinify(t, "+ +x", "+ +x;")
expectPrintedMinify(t, "- --x", "- --x;")
expectPrintedMinify(t, "+ --x", "+--x;")
expectPrintedMinify(t, "- ++x", "-++x;")
expectPrintedMinify(t, "+ ++x", "+ ++x;")
expectPrintedMinify(t, "x - --y", "x- --y;")
expectPrintedMinify(t, "x + --y", "x+--y;")
expectPrintedMinify(t, "x - ++y", "x-++y;")
expectPrintedMinify(t, "x + ++y", "x+ ++y;")
expectPrintedMinify(t, "x-- > y", "x-- >y;")
expectPrintedMinify(t, "x < !--y", "x<! --y;")
expectPrintedMinify(t, "x > !--y", "x>!--y;")
expectPrintedMinify(t, "!--y", "!--y;")
expectPrintedMinify(t, "1 + -0", "1+-0;")
expectPrintedMinify(t, "1 - -0", "1- -0;")
expectPrintedMinify(t, "1 + -Infinity", "1+-Infinity;")
expectPrintedMinify(t, "1 - -Infinity", "1- -Infinity;")
expectPrintedMinify(t, "/x/ / /y/", "/x// /y/;")
expectPrintedMinify(t, "/x/ + Foo", "/x/+Foo;")
expectPrintedMinify(t, "/x/ instanceof Foo", "/x/ instanceof Foo;")
expectPrintedMinify(t, "[x] instanceof Foo", "[x]instanceof Foo;")
expectPrintedMinify(t, "throw x", "throw x;")
expectPrintedMinify(t, "throw typeof x", "throw typeof x;")
expectPrintedMinify(t, "throw delete x", "throw delete x;")
expectPrintedMinify(t, "throw function(){}", "throw function(){};")
expectPrintedMinify(t, "x in function(){}", "x in function(){};")
expectPrintedMinify(t, "x instanceof function(){}", "x instanceof function(){};")
expectPrintedMinify(t, "π in function(){}", "π in function(){};")
expectPrintedMinify(t, "π instanceof function(){}", "π instanceof function(){};")
expectPrintedMinify(t, "()=>({})", "()=>({});")
expectPrintedMinify(t, "()=>({}[1])", "()=>({})[1];")
expectPrintedMinify(t, "()=>({}+0)", "()=>({}+0);")
expectPrintedMinify(t, "()=>function(){}", "()=>function(){};")
expectPrintedMinify(t, "(function(){})", "(function(){});")
expectPrintedMinify(t, "(class{})", "(class{});")
expectPrintedMinify(t, "({})", "({});")
}
func TestMangle(t *testing.T) {
expectPrintedMangle(t, "let x = '\\n'", "let x = `\n`;\n")
expectPrintedMangle(t, "let x = `\n`", "let x = `\n`;\n")
expectPrintedMangle(t, "let x = '\\n${}'", "let x = \"\\n${}\";\n")
expectPrintedMangle(t, "let x = `\n\\${}`", "let x = \"\\n${}\";\n")
expectPrintedMangle(t, "let x = `\n\\${}${y}\\${}`", "let x = `\n\\${}${y}\\${}`;\n")
}
func TestMinify(t *testing.T) {
expectPrintedMinify(t, "0.1", ".1;")
expectPrintedMinify(t, "1.2", "1.2;")
expectPrintedMinify(t, "() => {}", "()=>{};")
expectPrintedMinify(t, "(a) => {}", "a=>{};")
expectPrintedMinify(t, "(...a) => {}", "(...a)=>{};")
expectPrintedMinify(t, "(a = 0) => {}", "(a=0)=>{};")
expectPrintedMinify(t, "(a, b) => {}", "(a,b)=>{};")
expectPrinted(t, "true ** 2", "true ** 2;\n")
expectPrinted(t, "false ** 2", "false ** 2;\n")
expectPrintedMinify(t, "true ** 2", "true**2;")
expectPrintedMinify(t, "false ** 2", "false**2;")
expectPrintedMangle(t, "true ** 2", "(!0) ** 2;\n")
expectPrintedMangle(t, "false ** 2", "(!1) ** 2;\n")
expectPrintedMinify(t, "import a from 'path'", "import a from\"path\";")
expectPrintedMinify(t, "import * as ns from 'path'", "import*as ns from\"path\";")
expectPrintedMinify(t, "import {a, b as c} from 'path'", "import{a,b as c}from\"path\";")
expectPrintedMinify(t, "import {a, ' ' as c} from 'path'", "import{a,\" \"as c}from\"path\";")
expectPrintedMinify(t, "export * as ns from 'path'", "export*as ns from\"path\";")
expectPrintedMinify(t, "export * as ' ' from 'path'", "export*as\" \"from\"path\";")
expectPrintedMinify(t, "export {a, b as c} from 'path'", "export{a,b as c}from\"path\";")
expectPrintedMinify(t, "export {' ', '-' as ';'} from 'path'", "export{\" \",\"-\"as\";\"}from\"path\";")
expectPrintedMinify(t, "let a, b; export {a, b as c}", "let a,b;export{a,b as c};")
expectPrintedMinify(t, "let a, b; export {a, b as ' '}", "let a,b;export{a,b as\" \"};")
// Print some strings using template literals when minifying
expectPrinted(t, "x = '\\n'", "x = \"\\n\";\n")
expectPrintedMangle(t, "x = '\\n'", "x = `\n`;\n")
expectPrintedMangle(t, "x = {'\\n': 0}", "x = { \"\\n\": 0 };\n")
expectPrintedMangle(t, "x = class{'\\n' = 0}", "x = class {\n \"\\n\" = 0;\n};\n")
expectPrintedMangle(t, "class Foo{'\\n' = 0}", "class Foo {\n \"\\n\" = 0;\n}\n")
// Special identifiers must not be minified
expectPrintedMinify(t, "exports", "exports;")
expectPrintedMinify(t, "require", "require;")
expectPrintedMinify(t, "module", "module;")
// Comment statements must not affect their surroundings when minified
expectPrintedMinify(t, "//!single\nthrow 1 + 2", "//!single\nthrow 1+2;")
expectPrintedMinify(t, "/*!multi-\nline*/\nthrow 1 + 2", "/*!multi-\nline*/throw 1+2;")
}
func TestES5(t *testing.T) {
expectPrintedTargetMangle(t, 5, "foo('a\\n\\n\\nb')", "foo(\"a\\n\\n\\nb\");\n")
expectPrintedTargetMangle(t, 2015, "foo('a\\n\\n\\nb')", "foo(`a\n\n\nb`);\n")
expectPrintedTarget(t, 5, "foo({a, b})", "foo({ a: a, b: b });\n")
expectPrintedTarget(t, 2015, "foo({a, b})", "foo({ a, b });\n")
expectPrintedTarget(t, 5, "x => x", "(function(x) {\n return x;\n});\n")
expectPrintedTarget(t, 2015, "x => x", "(x) => x;\n")
expectPrintedTarget(t, 5, "() => {}", "(function() {\n});\n")
expectPrintedTarget(t, 2015, "() => {}", "() => {\n};\n")
expectPrintedTargetMinify(t, 5, "x => x", "(function(x){return x});")
expectPrintedTargetMinify(t, 2015, "x => x", "x=>x;")
expectPrintedTargetMinify(t, 5, "() => {}", "(function(){});")
expectPrintedTargetMinify(t, 2015, "() => {}", "()=>{};")
}
func TestASCIIOnly(t *testing.T) {
expectPrinted(t, "let π = 'π'", "let π = \"π\";\n")
expectPrinted(t, "let π_ = 'π'", "let π_ = \"π\";\n")
expectPrinted(t, "let _π = 'π'", "let _π = \"π\";\n")
expectPrintedASCII(t, "let π = 'π'", "let \\u03C0 = \"\\u03C0\";\n")
expectPrintedASCII(t, "let π_ = 'π'", "let \\u03C0_ = \"\\u03C0\";\n")
expectPrintedASCII(t, "let _π = 'π'", "let _\\u03C0 = \"\\u03C0\";\n")
expectPrinted(t, "let 貓 = '🐈'", "let 貓 = \"🐈\";\n")
expectPrinted(t, "let 貓abc = '🐈'", "let 貓abc = \"🐈\";\n")
expectPrinted(t, "let abc貓 = '🐈'", "let abc貓 = \"🐈\";\n")
expectPrintedASCII(t, "let 貓 = '🐈'", "let \\u8C93 = \"\\u{1F408}\";\n")
expectPrintedASCII(t, "let 貓abc = '🐈'", "let \\u8C93abc = \"\\u{1F408}\";\n")
expectPrintedASCII(t, "let abc貓 = '🐈'", "let abc\\u8C93 = \"\\u{1F408}\";\n")
// Test a character outside the BMP
expectPrinted(t, "var 𐀀", "var 𐀀;\n")
expectPrinted(t, "var \\u{10000}", "var 𐀀;\n")
expectPrintedASCII(t, "var 𐀀", "var \\u{10000};\n")
expectPrintedASCII(t, "var \\u{10000}", "var \\u{10000};\n")
expectPrintedTargetASCII(t, 2015, "'𐀀'", "\"\\u{10000}\";\n")
expectPrintedTargetASCII(t, 5, "'𐀀'", "\"\\uD800\\uDC00\";\n")
expectPrintedTargetASCII(t, 2015, "x.𐀀", "x[\"\\u{10000}\"];\n")
expectPrintedTargetASCII(t, 5, "x.𐀀", "x[\"\\uD800\\uDC00\"];\n")
// Escapes should use consistent case
expectPrintedASCII(t, "var \\u{100a} = {\\u100A: '\\u100A'}", "var \\u100A = { \\u100A: \"\\u100A\" };\n")
expectPrintedASCII(t, "var \\u{1000a} = {\\u{1000A}: '\\u{1000A}'}", "var \\u{1000A} = { \"\\u{1000A}\": \"\\u{1000A}\" };\n")
// These characters should always be escaped
expectPrinted(t, "let x = '\u2028'", "let x = \"\\u2028\";\n")
expectPrinted(t, "let x = '\u2029'", "let x = \"\\u2029\";\n")
expectPrinted(t, "let x = '\uFEFF'", "let x = \"\\uFEFF\";\n")
// There should still be a space before "extends"
expectPrintedASCII(t, "class 𐀀 extends π {}", "class \\u{10000} extends \\u03C0 {\n}\n")
expectPrintedASCII(t, "(class 𐀀 extends π {})", "(class \\u{10000} extends \\u03C0 {\n});\n")
expectPrintedMinifyASCII(t, "class 𐀀 extends π {}", "class \\u{10000} extends \\u03C0{}")
expectPrintedMinifyASCII(t, "(class 𐀀 extends π {})", "(class \\u{10000} extends \\u03C0{});")
}
func TestJSX(t *testing.T) {
expectPrintedJSX(t, "<a/>", "<a />;\n")
expectPrintedJSX(t, "<A/>", "<A />;\n")
expectPrintedJSX(t, "<a.b/>", "<a.b />;\n")
expectPrintedJSX(t, "<A.B/>", "<A.B />;\n")
expectPrintedJSX(t, "<a-b/>", "<a-b />;\n")
expectPrintedJSX(t, "<a:b/>", "<a:b />;\n")
expectPrintedJSX(t, "<a></a>", "<a />;\n")
expectPrintedJSX(t, "<a b></a>", "<a b />;\n")
expectPrintedJSX(t, "<a b={true}></a>", "<a b={true} />;\n")
expectPrintedJSX(t, "<a b={'x'}></a>", "<a b=\"x\" />;\n")
expectPrintedJSX(t, "<a b={`'`}></a>", "<a b=\"'\" />;\n")
expectPrintedJSX(t, "<a b={`\"`}></a>", "<a b='\"' />;\n")
expectPrintedJSX(t, "<a b={`'\"`}></a>", "<a b={`'\"`} />;\n")
expectPrintedJSX(t, "<a b=\""\"></a>", "<a b='\"' />;\n")
expectPrintedJSX(t, "<a b=\"&\"></a>", "<a b={\"&\"} />;\n")
expectPrintedJSX(t, "<a>x</a>", "<a>x</a>;\n")
expectPrintedJSX(t, "<a>x\ny</a>", "<a>x y</a>;\n")
expectPrintedJSX(t, "<a>{'x'}{'y'}</a>", "<a>\n {\"x\"}\n {\"y\"}\n</a>;\n")
expectPrintedJSX(t, "<a> x</a>", "<a> x</a>;\n")
expectPrintedJSX(t, "<a>x </a>", "<a>x </a>;\n")
expectPrintedJSX(t, "<a> </a>", "<a>{\"\\n\"}</a>;\n")
expectPrintedJSX(t, "<a>&</a>", "<a>{\"&\"}</a>;\n")
expectPrintedJSX(t, "<a><</a>", "<a>{\"<\"}</a>;\n")
expectPrintedJSX(t, "<a>></a>", "<a>{\">\"}</a>;\n")
expectPrintedJSX(t, "<a>{</a>", "<a>{\"{\"}</a>;\n")
expectPrintedJSX(t, "<a>}</a>", "<a>{\"}\"}</a>;\n")
expectPrintedJSX(t, "<a><x/></a>", "<a><x /></a>;\n")
expectPrintedJSX(t, "<a><x/><y/></a>", "<a>\n <x />\n <y />\n</a>;\n")
expectPrintedJSX(t, "<a>b<c/>d</a>", "<a>\n {\"b\"}\n <c />\n {\"d\"}\n</a>;\n")
expectPrintedJSX(t, "<></>", "<></>;\n")
expectPrintedJSX(t, "<>x<y/>z</>", "<>\n {\"x\"}\n <y />\n {\"z\"}\n</>;\n")
// These can't be escaped because JSX lacks a syntax for escapes
expectPrintedJSXASCII(t, "<π/>", "<π />;\n")
expectPrintedJSXASCII(t, "<π.𐀀/>", "<π.𐀀 />;\n")
expectPrintedJSXASCII(t, "<𐀀.π/>", "<𐀀.π />;\n")
expectPrintedJSXASCII(t, "<π>x</π>", "<π>x</π>;\n")
expectPrintedJSXASCII(t, "<𐀀>x</𐀀>", "<𐀀>x</𐀀>;\n")
expectPrintedJSXASCII(t, "<a π/>", "<a π />;\n")
expectPrintedJSXASCII(t, "<a 𐀀/>", "<a 𐀀 />;\n")
// These can be escaped but as JS strings (since XML entities in JSX aren't standard)
expectPrintedJSXASCII(t, "<a b='π'/>", "<a b={\"\\u03C0\"} />;\n")
expectPrintedJSXASCII(t, "<a b='𐀀'/>", "<a b={\"\\u{10000}\"} />;\n")
expectPrintedJSXASCII(t, "<a>π</a>", "<a>{\"\\u03C0\"}</a>;\n")
expectPrintedJSXASCII(t, "<a>𐀀</a>", "<a>{\"\\u{10000}\"}</a>;\n")
expectPrintedJSXMinify(t, "<a b c={x,y} d='true'/>", "<a b c={(x,y)}d=\"true\"/>;")
expectPrintedJSXMinify(t, "<a><b/><c/></a>", "<a><b/><c/></a>;")
expectPrintedJSXMinify(t, "<a> x <b/> y </a>", "<a> x <b/> y </a>;")
expectPrintedJSXMinify(t, "<a>{' x '}{'<b/>'}{' y '}</a>", "<a> x {\"<b/>\"} y </a>;")
}
func TestJSXSingleLine(t *testing.T) {
expectPrintedJSX(t, "<x/>", "<x />;\n")
expectPrintedJSX(t, "<x y/>", "<x y />;\n")
expectPrintedJSX(t, "<x\n/>", "<x />;\n")
expectPrintedJSX(t, "<x\ny/>", "<x\n y\n/>;\n")
expectPrintedJSX(t, "<x y\n/>", "<x\n y\n/>;\n")
expectPrintedJSX(t, "<x\n{...y}/>", "<x\n {...y}\n/>;\n")
expectPrintedJSXMinify(t, "<x/>", "<x/>;")
expectPrintedJSXMinify(t, "<x y/>", "<x y/>;")
expectPrintedJSXMinify(t, "<x\n/>", "<x/>;")
expectPrintedJSXMinify(t, "<x\ny/>", "<x y/>;")