diff --git a/.clang-format b/.clang-format
new file mode 100644
index 0000000..0198953
--- /dev/null
+++ b/.clang-format
@@ -0,0 +1,142 @@
+---
+Language: JavaScript
+
+# ---------------------------
+# general style settings
+# ---------------------------
+BasedOnStyle:  ''                            # (LLVM,Google,Chromium,Mozilla,WebKit,Microsoft,GNU,InheritParentConfig)
+ColumnLimit:   0                             # 0: disable column limit
+LineEnding:    LF                            # use LF line endings
+UseTab:        ForContinuationAndIndentation # (Never,ForIndentation,ForContinuationAndIndentation,Always)
+TabWidth:      4                             # recommended to set this equal to IndentWidth
+IndentWidth:   4                             # how wide each indent is
+ContinuationIndentWidth: 4                   # width for a line continuation
+
+# ---------------------------
+# alignment options
+# ---------------------------
+AlignAfterOpenBracket:        Align            # (Align,DontAlign,AlwaysBreak,BlockIndent)
+AlignArrayOfStructures:       Left             # (Left,Right,None)
+AlignConsecutiveAssignments:  None             # (None,Consecutive,AcrossEmptyLines,AcrossComments,AcrossEmptyLinesAndComments)
+AlignConsecutiveDeclarations: None             # (None,Consecutive,AcrossEmptyLines,AcrossComments,AcrossEmptyLinesAndComments)
+AlignEscapedNewlines:         Left             # (DontAlign,Left,LeftWithLastLine,Right)
+AlignOperands:                Align            # (DontAlign,Align,AlignAfterOperator)
+AlignTrailingComments:        Always           # (Leave,Always,Never)
+
+# ---------------------------
+# short constructs on a single line
+# ---------------------------
+AllowShortBlocksOnASingleLine:       Always        # (Never,Empty,Always)
+AllowShortFunctionsOnASingleLine:    All           # (None,InlineOnly,Empty,All)
+AllowShortLambdasOnASingleLine:      All           # (None,Empty,Inline,All)
+AllowShortIfStatementsOnASingleLine: AllIfsAndElse # (Never,WithoutElse,OnlyFirstIf,AllIfsAndElse)
+AllowShortCaseLabelsOnASingleLine:   true
+AllowShortEnumsOnASingleLine:        true
+AllowShortLoopsOnASingleLine:        true
+
+# ---------------------------
+# break and wrapping options
+# ---------------------------
+AlwaysBreakBeforeMultilineStrings: true      # when defining multi-line strings, linebreak should be inserted
+BreakAfterReturnType:           Automatic    # is decided by PenaltyReturnTypeOnItsOwnLine
+BreakBeforeBinaryOperators:     None         # (None,NonAssignment,All)
+BreakBeforeBraces:              Attach       # (Attach,Linux,Mozilla,Stroustrup,Allman,Whitesmiths,GNU,WebKit,Custom)
+BreakInheritanceList:           BeforeColon  # (BeforeColon,BeforeComma,AfterColon)
+BreakConstructorInitializers:   BeforeColon  # (BeforeColon,BeforeComma,AfterColon)
+BreakBeforeTernaryOperators:    true
+BreakStringLiterals:            true
+
+# ---------------------------
+# brace wrapping configuration
+# ---------------------------
+BraceWrapping:
+  AfterControlStatement: Never # (Never,MultiLine,Always)
+  AfterCaseLabel:        false
+  AfterClass:            false
+  AfterEnum:             false
+  AfterFunction:         false
+  AfterNamespace:        false
+  AfterObjCDeclaration:  false
+  AfterStruct:           false
+  AfterUnion:            false
+  AfterExternBlock:      false
+  BeforeCatch:           false
+  BeforeElse:            false
+  BeforeLambdaBody:      false
+  BeforeWhile:           false
+  IndentBraces:          false
+  SplitEmptyFunction:    false
+  SplitEmptyRecord:      false
+  SplitEmptyNamespace:   false
+
+# ---------------------------
+# constructor initializer and parameter packing options
+# ---------------------------
+ConstructorInitializerIndentWidth: 4
+PackConstructorInitializers: BinPack          # (Never,BinPack,CurrentLine,NextLine,NextLineOnly)
+BinPackParameters: true                       # use bin-packing for paramter lists
+BinPackArguments:  false                      # false: function calls either on one line or one per line
+
+
+# ---------------------------
+# additional formatting and sorting details
+# ---------------------------
+AllowAllArgumentsOnNextLine:      false
+AllowAllParametersOfDeclarationOnNextLine: false
+EmptyLineAfterAccessModifier:     Never                # (Never,Leave,Always)
+EmptyLineBeforeAccessModifier:    LogicalBlock         # (Never,Leave,LogicalBlock,Always)
+ExperimentalAutoDetectBinPacking: false
+FixNamespaceComments:             true                 # adds comments at namespace delimiters
+MaxEmptyLinesToKeep:              4                    # what the maximum amount of empty lines that we're allowed to keep
+ReflowComments:                   true                 # reflow comment text to match column limits
+RemoveBracesLLVM:                 false                # don't automatically remove braces
+SeparateDefinitionBlocks:         Leave                # (Leave,Always.Never)
+ShortNamespaceLines:              1                    # how many lines a namespaces can be to be regarded "short"
+SortIncludes:                     CaseSensitive        # (Never,CaseSensitive,CaseInsensitive)
+SortJavaStaticImport:             Before               # (After,Before)
+SortUsingDeclarations:            LexicographicNumeric # (Never,Lexicographic,LexicographicNumeric)
+
+# ---------------------------
+# spacing options
+# ---------------------------
+SpaceAfterCStyleCast:             false
+SpaceAfterLogicalNot:             false
+SpaceBeforeAssignmentOperators:   true
+SpaceBeforeCaseColon:             false
+SpaceBeforeCtorInitializerColon:  true
+SpaceBeforeInheritanceColon:      true
+SpaceBeforeParens:                ControlStatements # (ControlStatements,ControlStatementsExceptControlMacros,NonEmptyParentheses,Always,Custom)
+SpaceBeforeParensOptions:
+  AfterControlStatements:       true
+  AfterFunctionDefinitionName:  false
+  AfterFunctionDeclarationName: false
+  BeforeNonEmptyParentheses:    false
+SpaceBeforeRangeBasedForLoopColon: true
+SpaceInEmptyBlock:                 true
+SpacesInParens:            Custom
+SpacesInParensOptions:
+  ExceptDoubleParentheses: false
+  InConditionalStatements: false
+  InCStyleCasts:           false
+  Other:                   false
+SpacesBeforeTrailingComments: 1
+SpacesInAngles:               Never # (Never,Always,Leave)
+SpacesInConditionalStatement: false
+SpacesInContainerLiterals:    true
+SpacesInLineCommentPrefix:
+  Minimum: 1
+  Maximum: 1
+SpacesInParentheses:       false
+SpacesInSquareBrackets:    false
+SpaceBeforeSquareBrackets: false
+BitFieldColonSpacing:      Both # (Both,None,Before,After)
+
+# ---------------------------
+# indentation details
+# ---------------------------
+IndentAccessModifiers: false
+IndentCaseLabels:      false
+IndentCaseBlocks:      false
+IndentExternBlock:     AfterExternBlock  # (AfterExternBlock,NoIndent,Indent)
+IndentRequiresClause:  false
+...
diff --git a/.gitignore b/.gitignore
index e109b43..2cf9332 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,6 +4,7 @@
 # unignore specific dotfiles
 !.gitignore
 !.editorconfig
+!.clang-format
 !/.github/
 
 # ignore specific files
diff --git a/makefile b/makefile
index 50bbbc7..6df209d 100644
--- a/makefile
+++ b/makefile
@@ -19,6 +19,6 @@ out/index.html: web/index.html
 	cp -f $< $@
 
 # compiles / links source code
-out/script.js: web/src/*.tsx
+out/script.js: web/src/*.ts
 	@mkdir -p $(@D)
-	npx esbuild web/src/main.tsx $(ESFLAGS) --outfile=$@
+	npx esbuild web/src/main.ts $(ESFLAGS) --outfile=$@
diff --git a/web/src/main.ts b/web/src/main.ts
new file mode 100644
index 0000000..e06c775
--- /dev/null
+++ b/web/src/main.ts
@@ -0,0 +1,6 @@
+function main(): number {
+	return 0;
+}
+
+let c = main();
+if (!!c) console.error(`main returned failure, code: ${c}`);
diff --git a/web/src/main.tsx b/web/src/main.tsx
deleted file mode 100644
index 5a9fa19..0000000
--- a/web/src/main.tsx
+++ /dev/null
@@ -1,5 +0,0 @@
-import React from 'react'
-import { createRoot } from 'react-dom/client'
-
-const Main = () => <h1>Hello, World</h1>
-createRoot(document.getElementById("root")!).render(<Main />)