File size: 3,254 Bytes
bf96836 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 | #!/usr/bin/env node
/**
* PostToolUse Hook: TypeScript check after editing .ts/.tsx files
*
* Cross-platform (Windows, macOS, Linux)
*
* Runs after Edit tool use on TypeScript files. Walks up from the file's
* directory to find the nearest tsconfig.json, then runs tsc --noEmit
* and reports only errors related to the edited file.
*/
const { execFileSync } = require("child_process");
const fs = require("fs");
const path = require("path");
const MAX_STDIN = 1024 * 1024; // 1MB limit
let data = "";
process.stdin.setEncoding("utf8");
process.stdin.on("data", (chunk) => {
if (data.length < MAX_STDIN) {
const remaining = MAX_STDIN - data.length;
data += chunk.substring(0, remaining);
}
});
process.stdin.on("end", () => {
try {
const input = JSON.parse(data);
const filePath = input.tool_input?.file_path;
if (filePath && /\.(ts|tsx)$/.test(filePath)) {
const resolvedPath = path.resolve(filePath);
if (!fs.existsSync(resolvedPath)) {
process.stdout.write(data);
process.exit(0);
}
// Find nearest tsconfig.json by walking up (max 20 levels to prevent infinite loop)
let dir = path.dirname(resolvedPath);
const root = path.parse(dir).root;
let depth = 0;
while (dir !== root && depth < 20) {
if (fs.existsSync(path.join(dir, "tsconfig.json"))) {
break;
}
dir = path.dirname(dir);
depth++;
}
if (fs.existsSync(path.join(dir, "tsconfig.json"))) {
try {
// Use npx.cmd on Windows to avoid shell: true which enables command injection
const npxBin = process.platform === "win32" ? "npx.cmd" : "npx";
execFileSync(npxBin, ["tsc", "--noEmit", "--pretty", "false"], {
cwd: dir,
encoding: "utf8",
stdio: ["pipe", "pipe", "pipe"],
timeout: 30000,
});
} catch (err) {
// tsc exits non-zero when there are errors — filter to edited file
const output = (err.stdout || "") + (err.stderr || "");
// Compute paths that uniquely identify the edited file.
// tsc output uses paths relative to its cwd (the tsconfig dir),
// so check for the relative path, absolute path, and original path.
// Avoid bare basename matching — it causes false positives when
// multiple files share the same name (e.g., src/utils.ts vs tests/utils.ts).
const relPath = path.relative(dir, resolvedPath);
const candidates = new Set([filePath, resolvedPath, relPath]);
const relevantLines = output
.split("\n")
.filter((line) => {
for (const candidate of candidates) {
if (line.includes(candidate)) return true;
}
return false;
})
.slice(0, 10);
if (relevantLines.length > 0) {
console.error(
"[Hook] TypeScript errors in " + path.basename(filePath) + ":",
);
relevantLines.forEach((line) => console.error(line));
}
}
}
}
} catch {
// Invalid input — pass through
}
process.stdout.write(data);
process.exit(0);
});
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