1 files changed, 125 insertions, 0 deletions
diff --git a/languages/typescript/tests/validate-typescript.bats b/languages/typescript/tests/validate-typescript.bats
new file mode 100644
index 0000000..c5da5d4
--- /dev/null
+++ b/languages/typescript/tests/validate-typescript.bats
@@ -0,0 +1,125 @@
+#!/usr/bin/env bats
+#
+# Tests for languages/typescript/claude/hooks/validate-typescript.sh — the
+# PostToolUse hook that syntax-checks edited TS/JS files and blocks on a
+# violation.
+#
+# The hook reads tool-call JSON on stdin and extracts the file path, so each
+# test pipes a JSON payload naming a real file it wrote into a temp dir.
+#
+# The syntax gate needs node, so those tests skip when node is absent. Full
+# type checking is deliberately out of scope for the hook (it needs the whole
+# project graph), so a type error that is syntactically valid must pass.
+
+HOOK="$(cd "$(dirname "$BATS_TEST_FILENAME")/.." && pwd)/claude/hooks/validate-typescript.sh"
+
+setup() {
+  TEST_DIR="$(mktemp -d -t validate-ts-bats.XXXXXX)"
+}
+
+teardown() {
+  rm -rf "$TEST_DIR"
+}
+
+payload() {
+  printf '{"tool_input": {"file_path": "%s"}}' "$1"
+}
+
+# ---- Normal ----------------------------------------------------------
+
+@test "validate-typescript: a clean .ts file passes silently (exit 0)" {
+  command -v node >/dev/null 2>&1 || skip "node not installed"
+  printf 'export function f(x: number): number {\n  return x + 1;\n}\n' > "$TEST_DIR/clean.ts"
+  run bash "$HOOK" <<< "$(payload "$TEST_DIR/clean.ts")"
+  [ "$status" -eq 0 ]
+  [ -z "$output" ]
+}
+
+@test "validate-typescript: a clean .js file passes silently (exit 0)" {
+  command -v node >/dev/null 2>&1 || skip "node not installed"
+  printf 'export function f(x) {\n  return x + 1;\n}\n' > "$TEST_DIR/clean.js"
+  run bash "$HOOK" <<< "$(payload "$TEST_DIR/clean.js")"
+  [ "$status" -eq 0 ]
+}
+
+@test "validate-typescript: a .tsx file is validated too" {
+  command -v node >/dev/null 2>&1 || skip "node not installed"
+  printf 'export const A = 1;\n' > "$TEST_DIR/clean.tsx"
+  run bash "$HOOK" <<< "$(payload "$TEST_DIR/clean.tsx")"
+  [ "$status" -eq 0 ]
+}
+
+# ---- Error -----------------------------------------------------------
+
+@test "validate-typescript: a syntax error blocks (exit 2, names the failure)" {
+  command -v node >/dev/null 2>&1 || skip "node not installed"
+  printf 'export function f( {\n  return 1;\n}\n' > "$TEST_DIR/bad.ts"
+  run bash "$HOOK" <<< "$(payload "$TEST_DIR/bad.ts")"
+  [ "$status" -eq 2 ]
+  [[ "$output" == *"SYNTAX"* ]]
+}
+
+@test "validate-typescript: the block payload is valid JSON carrying the context" {
+  command -v node >/dev/null 2>&1 || skip "node not installed"
+  printf 'const x = ;\n' > "$TEST_DIR/bad.js"
+  run bash "$HOOK" <<< "$(payload "$TEST_DIR/bad.js")"
+  [ "$status" -eq 2 ]
+  echo "$output" | head -1 | jq -e '.hookSpecificOutput.hookEventName == "PostToolUse"'
+}
+
+# ---- Boundary --------------------------------------------------------
+
+@test "validate-typescript: a type error that parses is NOT blocked (out of scope)" {
+  command -v node >/dev/null 2>&1 || skip "node not installed"
+  # Assigning a string to a number is a type error, not a syntax error. The
+  # hook checks parseability only; tsc over the project graph owns this.
+  printf 'const n: number = "not a number";\nexport { n };\n' > "$TEST_DIR/typeerr.ts"
+  run bash "$HOOK" <<< "$(payload "$TEST_DIR/typeerr.ts")"
+  [ "$status" -eq 0 ]
+}
+
+@test "validate-typescript: TS-only syntax in a .ts file parses (not read as JS)" {
+  command -v node >/dev/null 2>&1 || skip "node not installed"
+  # Interfaces and type annotations are invalid JS. Stripping types must happen
+  # before the parse, or every real .ts file would be reported as broken.
+  printf 'interface P { a: string }\nexport const p: P = { a: "x" };\n' > "$TEST_DIR/types.ts"
+  run bash "$HOOK" <<< "$(payload "$TEST_DIR/types.ts")"
+  [ "$status" -eq 0 ]
+}
+
+@test "validate-typescript: a non-TS/JS file is ignored (exit 0)" {
+  printf 'not javascript at all (((\n' > "$TEST_DIR/notes.txt"
+  run bash "$HOOK" <<< "$(payload "$TEST_DIR/notes.txt")"
+  [ "$status" -eq 0 ]
+}
+
+@test "validate-typescript: a .json file is ignored (exit 0)" {
+  printf '{"a": 1}\n' > "$TEST_DIR/data.json"
+  run bash "$HOOK" <<< "$(payload "$TEST_DIR/data.json")"
+  [ "$status" -eq 0 ]
+}
+
+@test "validate-typescript: empty file_path is a no-op (exit 0)" {
+  run bash "$HOOK" <<< '{"tool_input": {}}'
+  [ "$status" -eq 0 ]
+}
+
+@test "validate-typescript: a missing file is a no-op (exit 0)" {
+  run bash "$HOOK" <<< "$(payload "$TEST_DIR/does-not-exist.ts")"
+  [ "$status" -eq 0 ]
+}
+
+@test "validate-typescript: an empty .ts file passes" {
+  command -v node >/dev/null 2>&1 || skip "node not installed"
+  : > "$TEST_DIR/empty.ts"
+  run bash "$HOOK" <<< "$(payload "$TEST_DIR/empty.ts")"
+  [ "$status" -eq 0 ]
+}
+
+@test "validate-typescript: a file in a dotted parent dir is still matched" {
+  command -v node >/dev/null 2>&1 || skip "node not installed"
+  mkdir -p "$TEST_DIR/my.project"
+  printf 'const x = ;\n' > "$TEST_DIR/my.project/bad.ts"
+  run bash "$HOOK" <<< "$(payload "$TEST_DIR/my.project/bad.ts")"
+  [ "$status" -eq 2 ]
+}