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Format options + fourslash testing + fix formatting bugs #2370

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ecddfc4
format options implementation
iisaduan Dec 2, 2025
1e5c2ea
Merge branch 'main' of https://github.com/microsoft/typescript-go int…
iisaduan Dec 2, 2025
48bdad2
merge
iisaduan Dec 2, 2025
4f60eeb
Merge branch 'main' of https://github.com/microsoft/typescript-go int…
iisaduan Dec 3, 2025
ca78105
formatting
iisaduan Dec 12, 2025
ea1ac02
Merge branch 'main' of https://github.com/microsoft/typescript-go int…
iisaduan Dec 12, 2025
c105023
updatefailing
iisaduan Dec 12, 2025
ae84521
fix broken error message and nil formatcodesettings pointer
iisaduan Dec 13, 2025
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3 changes: 2 additions & 1 deletion internal/execute/tsc.go
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Original file line number Diff line number Diff line change
Expand Up @@ -16,6 +16,7 @@ import (
"github.com/microsoft/typescript-go/internal/format"
"github.com/microsoft/typescript-go/internal/jsonutil"
"github.com/microsoft/typescript-go/internal/locale"
"github.com/microsoft/typescript-go/internal/ls/lsutil"
"github.com/microsoft/typescript-go/internal/parser"
"github.com/microsoft/typescript-go/internal/pprof"
"github.com/microsoft/typescript-go/internal/tsoptions"
Expand All @@ -36,7 +37,7 @@ func CommandLine(sys tsc.System, commandLineArgs []string, testing tsc.CommandLi
}

func fmtMain(sys tsc.System, input, output string) tsc.ExitStatus {
ctx := format.WithFormatCodeSettings(context.Background(), format.GetDefaultFormatCodeSettings("\n"), "\n")
ctx := format.WithFormatCodeSettings(context.Background(), lsutil.GetDefaultFormatCodeSettings(), "\n")
input = string(tspath.ToPath(input, sys.GetCurrentDirectory(), sys.FS().UseCaseSensitiveFileNames()))
output = string(tspath.ToPath(output, sys.GetCurrentDirectory(), sys.FS().UseCaseSensitiveFileNames()))
fileContent, ok := sys.FS().ReadFile(input)
Expand Down
11 changes: 7 additions & 4 deletions internal/format/api.go
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Original file line number Diff line number Diff line change
Expand Up @@ -6,6 +6,7 @@ import (

"github.com/microsoft/typescript-go/internal/ast"
"github.com/microsoft/typescript-go/internal/core"
"github.com/microsoft/typescript-go/internal/ls/lsutil"
"github.com/microsoft/typescript-go/internal/scanner"
"github.com/microsoft/typescript-go/internal/stringutil"
)
Expand All @@ -28,16 +29,18 @@ const (
formatNewlineKey
)

func WithFormatCodeSettings(ctx context.Context, options *FormatCodeSettings, newLine string) context.Context {
func WithFormatCodeSettings(ctx context.Context, options *lsutil.FormatCodeSettings, newLine string) context.Context {
ctx = context.WithValue(ctx, formatOptionsKey, options)
ctx = context.WithValue(ctx, formatNewlineKey, newLine)
// In strada, the rules map was both globally cached *and* cached into the context, for some reason. We skip that here and just use the global one.
return ctx
}

func GetFormatCodeSettingsFromContext(ctx context.Context) *FormatCodeSettings {
opt := ctx.Value(formatOptionsKey).(*FormatCodeSettings)
return opt
func GetFormatCodeSettingsFromContext(ctx context.Context) *lsutil.FormatCodeSettings {
if opt := ctx.Value(formatOptionsKey); opt != nil {
return opt.(*lsutil.FormatCodeSettings)
}
return nil
}

func GetNewLineOrDefaultFromContext(ctx context.Context) string { // TODO: Move into broader LS - more than just the formatter uses the newline editor setting/host new line
Expand Down
13 changes: 7 additions & 6 deletions internal/format/api_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -9,6 +9,7 @@ import (
"github.com/microsoft/typescript-go/internal/ast"
"github.com/microsoft/typescript-go/internal/core"
"github.com/microsoft/typescript-go/internal/format"
"github.com/microsoft/typescript-go/internal/ls/lsutil"
"github.com/microsoft/typescript-go/internal/parser"
"github.com/microsoft/typescript-go/internal/printer"
"github.com/microsoft/typescript-go/internal/repo"
Expand Down Expand Up @@ -38,14 +39,14 @@ func TestFormat(t *testing.T) {

t.Run("format checker.ts", func(t *testing.T) {
t.Parallel()
ctx := format.WithFormatCodeSettings(t.Context(), &format.FormatCodeSettings{
EditorSettings: format.EditorSettings{
ctx := format.WithFormatCodeSettings(t.Context(), &lsutil.FormatCodeSettings{
EditorSettings: lsutil.EditorSettings{
TabSize: 4,
IndentSize: 4,
BaseIndentSize: 4,
NewLineCharacter: "\n",
ConvertTabsToSpaces: true,
IndentStyle: format.IndentStyleSmart,
IndentStyle: lsutil.IndentStyleSmart,
TrimTrailingWhitespace: true,
},
InsertSpaceBeforeTypeAnnotation: core.TSTrue,
Expand All @@ -67,14 +68,14 @@ func TestFormat(t *testing.T) {
}

func BenchmarkFormat(b *testing.B) {
ctx := format.WithFormatCodeSettings(b.Context(), &format.FormatCodeSettings{
EditorSettings: format.EditorSettings{
ctx := format.WithFormatCodeSettings(b.Context(), &lsutil.FormatCodeSettings{
EditorSettings: lsutil.EditorSettings{
TabSize: 4,
IndentSize: 4,
BaseIndentSize: 4,
NewLineCharacter: "\n",
ConvertTabsToSpaces: true,
IndentStyle: format.IndentStyleSmart,
IndentStyle: lsutil.IndentStyleSmart,
TrimTrailingWhitespace: true,
},
InsertSpaceBeforeTypeAnnotation: core.TSTrue,
Expand Down
37 changes: 19 additions & 18 deletions internal/format/comment_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -7,6 +7,7 @@ import (
"github.com/microsoft/typescript-go/internal/ast"
"github.com/microsoft/typescript-go/internal/core"
"github.com/microsoft/typescript-go/internal/format"
"github.com/microsoft/typescript-go/internal/ls/lsutil"
"github.com/microsoft/typescript-go/internal/parser"
"gotest.tools/v3/assert"
)
Expand All @@ -16,14 +17,14 @@ func TestCommentFormatting(t *testing.T) {

t.Run("format comment issue reproduction", func(t *testing.T) {
t.Parallel()
ctx := format.WithFormatCodeSettings(t.Context(), &format.FormatCodeSettings{
EditorSettings: format.EditorSettings{
ctx := format.WithFormatCodeSettings(t.Context(), &lsutil.FormatCodeSettings{
EditorSettings: lsutil.EditorSettings{
TabSize: 4,
IndentSize: 4,
BaseIndentSize: 4,
NewLineCharacter: "\n",
ConvertTabsToSpaces: true,
IndentStyle: format.IndentStyleSmart,
IndentStyle: lsutil.IndentStyleSmart,
TrimTrailingWhitespace: true,
},
InsertSpaceBeforeTypeAnnotation: core.TSTrue,
Expand Down Expand Up @@ -67,14 +68,14 @@ func TestCommentFormatting(t *testing.T) {

t.Run("format JSDoc with tab indentation", func(t *testing.T) {
t.Parallel()
ctx := format.WithFormatCodeSettings(t.Context(), &format.FormatCodeSettings{
EditorSettings: format.EditorSettings{
ctx := format.WithFormatCodeSettings(t.Context(), &lsutil.FormatCodeSettings{
EditorSettings: lsutil.EditorSettings{
TabSize: 4,
IndentSize: 4,
BaseIndentSize: 0,
NewLineCharacter: "\n",
ConvertTabsToSpaces: false, // Use tabs
IndentStyle: format.IndentStyleSmart,
IndentStyle: lsutil.IndentStyleSmart,
TrimTrailingWhitespace: true,
},
InsertSpaceBeforeTypeAnnotation: core.TSTrue,
Expand Down Expand Up @@ -104,14 +105,14 @@ func TestCommentFormatting(t *testing.T) {

t.Run("format comment inside multi-line argument list", func(t *testing.T) {
t.Parallel()
ctx := format.WithFormatCodeSettings(t.Context(), &format.FormatCodeSettings{
EditorSettings: format.EditorSettings{
ctx := format.WithFormatCodeSettings(t.Context(), &lsutil.FormatCodeSettings{
EditorSettings: lsutil.EditorSettings{
TabSize: 4,
IndentSize: 4,
BaseIndentSize: 0,
NewLineCharacter: "\n",
ConvertTabsToSpaces: false, // Use tabs
IndentStyle: format.IndentStyleSmart,
IndentStyle: lsutil.IndentStyleSmart,
TrimTrailingWhitespace: true,
},
InsertSpaceBeforeTypeAnnotation: core.TSTrue,
Expand All @@ -137,14 +138,14 @@ func TestCommentFormatting(t *testing.T) {

t.Run("format comment in chained method calls", func(t *testing.T) {
t.Parallel()
ctx := format.WithFormatCodeSettings(t.Context(), &format.FormatCodeSettings{
EditorSettings: format.EditorSettings{
ctx := format.WithFormatCodeSettings(t.Context(), &lsutil.FormatCodeSettings{
EditorSettings: lsutil.EditorSettings{
TabSize: 4,
IndentSize: 4,
BaseIndentSize: 0,
NewLineCharacter: "\n",
ConvertTabsToSpaces: false, // Use tabs
IndentStyle: format.IndentStyleSmart,
IndentStyle: lsutil.IndentStyleSmart,
TrimTrailingWhitespace: true,
},
InsertSpaceBeforeTypeAnnotation: core.TSTrue,
Expand All @@ -171,14 +172,14 @@ func TestCommentFormatting(t *testing.T) {
// Regression test for issue #1928 - panic when formatting chained method call with comment
t.Run("format chained method call with comment (issue #1928)", func(t *testing.T) {
t.Parallel()
ctx := format.WithFormatCodeSettings(t.Context(), &format.FormatCodeSettings{
EditorSettings: format.EditorSettings{
ctx := format.WithFormatCodeSettings(t.Context(), &lsutil.FormatCodeSettings{
EditorSettings: lsutil.EditorSettings{
TabSize: 4,
IndentSize: 4,
BaseIndentSize: 0,
NewLineCharacter: "\n",
ConvertTabsToSpaces: false, // Use tabs
IndentStyle: format.IndentStyleSmart,
IndentStyle: lsutil.IndentStyleSmart,
TrimTrailingWhitespace: true,
},
InsertSpaceBeforeTypeAnnotation: core.TSTrue,
Expand Down Expand Up @@ -208,14 +209,14 @@ func TestSliceBoundsPanic(t *testing.T) {

t.Run("format code with trailing semicolon should not panic", func(t *testing.T) {
t.Parallel()
ctx := format.WithFormatCodeSettings(t.Context(), &format.FormatCodeSettings{
EditorSettings: format.EditorSettings{
ctx := format.WithFormatCodeSettings(t.Context(), &lsutil.FormatCodeSettings{
EditorSettings: lsutil.EditorSettings{
TabSize: 4,
IndentSize: 4,
BaseIndentSize: 4,
NewLineCharacter: "\n",
ConvertTabsToSpaces: true,
IndentStyle: format.IndentStyleSmart,
IndentStyle: lsutil.IndentStyleSmart,
TrimTrailingWhitespace: true,
},
InsertSpaceBeforeTypeAnnotation: core.TSTrue,
Expand Down
84 changes: 3 additions & 81 deletions internal/format/context.go
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Expand Up @@ -3,88 +3,10 @@ package format
import (
"github.com/microsoft/typescript-go/internal/ast"
"github.com/microsoft/typescript-go/internal/core"
"github.com/microsoft/typescript-go/internal/ls/lsutil"
"github.com/microsoft/typescript-go/internal/scanner"
)

type IndentStyle int

const (
IndentStyleNone IndentStyle = iota
IndentStyleBlock
IndentStyleSmart
)

type SemicolonPreference string

const (
SemicolonPreferenceIgnore SemicolonPreference = "ignore"
SemicolonPreferenceInsert SemicolonPreference = "insert"
SemicolonPreferenceRemove SemicolonPreference = "remove"
)

type EditorSettings struct {
BaseIndentSize int
IndentSize int
TabSize int
NewLineCharacter string
ConvertTabsToSpaces bool
IndentStyle IndentStyle
TrimTrailingWhitespace bool
}

type FormatCodeSettings struct {
EditorSettings
InsertSpaceAfterCommaDelimiter core.Tristate
InsertSpaceAfterSemicolonInForStatements core.Tristate
InsertSpaceBeforeAndAfterBinaryOperators core.Tristate
InsertSpaceAfterConstructor core.Tristate
InsertSpaceAfterKeywordsInControlFlowStatements core.Tristate
InsertSpaceAfterFunctionKeywordForAnonymousFunctions core.Tristate
InsertSpaceAfterOpeningAndBeforeClosingNonemptyParenthesis core.Tristate
InsertSpaceAfterOpeningAndBeforeClosingNonemptyBrackets core.Tristate
InsertSpaceAfterOpeningAndBeforeClosingNonemptyBraces core.Tristate
InsertSpaceAfterOpeningAndBeforeClosingEmptyBraces core.Tristate
InsertSpaceAfterOpeningAndBeforeClosingTemplateStringBraces core.Tristate
InsertSpaceAfterOpeningAndBeforeClosingJsxExpressionBraces core.Tristate
InsertSpaceAfterTypeAssertion core.Tristate
InsertSpaceBeforeFunctionParenthesis core.Tristate
PlaceOpenBraceOnNewLineForFunctions core.Tristate
PlaceOpenBraceOnNewLineForControlBlocks core.Tristate
InsertSpaceBeforeTypeAnnotation core.Tristate
IndentMultiLineObjectLiteralBeginningOnBlankLine core.Tristate
Semicolons SemicolonPreference
IndentSwitchCase core.Tristate
}

func GetDefaultFormatCodeSettings(newLineCharacter string) *FormatCodeSettings {
return &FormatCodeSettings{
EditorSettings: EditorSettings{
IndentSize: 4,
TabSize: 4,
NewLineCharacter: newLineCharacter,
ConvertTabsToSpaces: true,
IndentStyle: IndentStyleSmart,
TrimTrailingWhitespace: true,
},
InsertSpaceAfterConstructor: core.TSFalse,
InsertSpaceAfterCommaDelimiter: core.TSTrue,
InsertSpaceAfterSemicolonInForStatements: core.TSTrue,
InsertSpaceBeforeAndAfterBinaryOperators: core.TSTrue,
InsertSpaceAfterKeywordsInControlFlowStatements: core.TSTrue,
InsertSpaceAfterFunctionKeywordForAnonymousFunctions: core.TSFalse,
InsertSpaceAfterOpeningAndBeforeClosingNonemptyParenthesis: core.TSFalse,
InsertSpaceAfterOpeningAndBeforeClosingNonemptyBrackets: core.TSFalse,
InsertSpaceAfterOpeningAndBeforeClosingNonemptyBraces: core.TSTrue,
InsertSpaceAfterOpeningAndBeforeClosingTemplateStringBraces: core.TSFalse,
InsertSpaceAfterOpeningAndBeforeClosingJsxExpressionBraces: core.TSFalse,
InsertSpaceBeforeFunctionParenthesis: core.TSFalse,
PlaceOpenBraceOnNewLineForFunctions: core.TSFalse,
PlaceOpenBraceOnNewLineForControlBlocks: core.TSFalse,
Semicolons: SemicolonPreferenceIgnore,
IndentSwitchCase: core.TSTrue,
}
}

type FormattingContext struct {
currentTokenSpan TextRangeWithKind
nextTokenSpan TextRangeWithKind
Expand All @@ -100,12 +22,12 @@ type FormattingContext struct {

SourceFile *ast.SourceFile
FormattingRequestKind FormatRequestKind
Options *FormatCodeSettings
Options *lsutil.FormatCodeSettings

scanner *scanner.Scanner
}

func NewFormattingContext(file *ast.SourceFile, kind FormatRequestKind, options *FormatCodeSettings) *FormattingContext {
func NewFormattingContext(file *ast.SourceFile, kind FormatRequestKind, options *lsutil.FormatCodeSettings) *FormattingContext {
res := &FormattingContext{
SourceFile: file,
FormattingRequestKind: kind,
Expand Down
7 changes: 4 additions & 3 deletions internal/format/format_test.go
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Expand Up @@ -7,6 +7,7 @@ import (
"github.com/microsoft/typescript-go/internal/ast"
"github.com/microsoft/typescript-go/internal/core"
"github.com/microsoft/typescript-go/internal/format"
"github.com/microsoft/typescript-go/internal/ls/lsutil"
"github.com/microsoft/typescript-go/internal/parser"
"gotest.tools/v3/assert"
)
Expand All @@ -30,14 +31,14 @@ func TestFormatNoTrailingNewline(t *testing.T) {
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
t.Parallel()
ctx := format.WithFormatCodeSettings(t.Context(), &format.FormatCodeSettings{
EditorSettings: format.EditorSettings{
ctx := format.WithFormatCodeSettings(t.Context(), &lsutil.FormatCodeSettings{
EditorSettings: lsutil.EditorSettings{
TabSize: 4,
IndentSize: 4,
BaseIndentSize: 4,
NewLineCharacter: "\n",
ConvertTabsToSpaces: true,
IndentStyle: format.IndentStyleSmart,
IndentStyle: lsutil.IndentStyleSmart,
TrimTrailingWhitespace: true,
},
}, "\n")
Expand Down
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