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Port TypeScript PR #60303: Fix template string escaping #1142

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Merged
merged 7 commits into from
Jun 16, 2025
Merged

Port TypeScript PR #60303: Fix template string escaping #1142

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45314e4
Initial plan for issue
Copilot Jun 10, 2025
3e616fb
Initial plan for TypeScript PR #60303 template string escaping fix
Copilot Jun 12, 2025
1d3732b
Fix template string escaping per TypeScript PR #60303
Copilot Jun 12, 2025
942edc6
Fix template string escaping: change ch < '\u001f' to ch <= '\u001f'
Copilot Jun 12, 2025
9f87b5f
Remove TestEscapeStringTemplateStrings test as it duplicates existing…
Copilot Jun 12, 2025
fadf221
Add test for template string escaping fix and force escaping for cont…
Copilot Jun 12, 2025
f5a06a8
Simplify template string escaping fix by removing unnecessary canUseO…
Copilot Jun 16, 2025
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1 change: 1 addition & 0 deletions internal/printer/printer_test.go
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Expand Up @@ -28,6 +28,7 @@ func TestEmit(t *testing.T) {
{title: "BooleanLiteral#1", input: `true`, output: `true;`},
{title: "BooleanLiteral#2", input: `false`, output: `false;`},
{title: "NoSubstitutionTemplateLiteral", input: "``", output: "``;"},
{title: "NoSubstitutionTemplateLiteral#2", input: "`\n`", output: "`\n`;"},
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I was mistaken; this test passes even without this PR's change. Add a test which would have failed before this PR's fix.

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Added a test case for \u001f character in template literals that would have failed before this PR's fix. The test demonstrates that \u001f is now properly escaped to \u001F while preserving the correct behavior for \n (which should not be escaped). Commit fadf221.

{title: "RegularExpressionLiteral#1", input: `/a/`, output: `/a/;`},
{title: "RegularExpressionLiteral#2", input: `/a/g`, output: `/a/g;`},
{title: "NullLiteral", input: `null`, output: `null;`},
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2 changes: 1 addition & 1 deletion internal/printer/utilities.go
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Expand Up @@ -103,7 +103,7 @@ func escapeStringWorker(s string, quoteChar QuoteChar, flags getLiteralTextFlags
escape = true
}
default:
if ch < '\u001f' || flags&getLiteralTextFlagsNeverAsciiEscape == 0 && ch > '\u007f' {
if ch <= '\u001f' || flags&getLiteralTextFlagsNeverAsciiEscape == 0 && ch > '\u007f' {
escape = true
}
}
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33 changes: 33 additions & 0 deletions internal/printer/utilities_test.go
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Expand Up @@ -90,6 +90,39 @@ func TestEscapeJsxAttributeString(t *testing.T) {
}
}

func TestEscapeStringTemplateStrings(t *testing.T) {
t.Parallel()
data := []struct {
s string
quoteChar QuoteChar
expected string
desc string
}{
// Test newline character (\u000a) - should NOT be escaped in template strings
{s: "\n", quoteChar: QuoteCharBacktick, expected: "\n", desc: "newline in template string"},
{s: "\n", quoteChar: QuoteCharDoubleQuote, expected: "\\n", desc: "newline in double quote string"},
{s: "\n", quoteChar: QuoteCharSingleQuote, expected: "\\n", desc: "newline in single quote string"},

// Test \u001f (Unit Separator) - should be escaped in template strings according to TypeScript PR #60303
{s: "\u001f", quoteChar: QuoteCharBacktick, expected: "\\u001F", desc: "\\u001f in template string"},
{s: "\u001f", quoteChar: QuoteCharDoubleQuote, expected: "\\u001F", desc: "\\u001f in double quote string"},
{s: "\u001f", quoteChar: QuoteCharSingleQuote, expected: "\\u001F", desc: "\\u001f in single quote string"},

// Test other control characters that should be escaped
{s: "\u0000", quoteChar: QuoteCharBacktick, expected: "\\0", desc: "\\u0000 in template string"},
{s: "\u0009", quoteChar: QuoteCharBacktick, expected: "\\t", desc: "\\u0009 (tab) in template string"},
{s: "\u000b", quoteChar: QuoteCharBacktick, expected: "\\v", desc: "\\u000b (vtab) in template string"},
{s: "\u001e", quoteChar: QuoteCharBacktick, expected: "\\u001E", desc: "\\u001e in template string"},
}
for i, rec := range data {
t.Run(fmt.Sprintf("[%d] %s", i, rec.desc), func(t *testing.T) {
t.Parallel()
actual := EscapeString(rec.s, rec.quoteChar)
assert.Equal(t, actual, rec.expected)
})
}
}

func TestIsRecognizedTripleSlashComment(t *testing.T) {
t.Parallel()
data := []struct {
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