diff --git a/lib/binding_web/package.json b/lib/binding_web/package.json
index 68202234..8425a274 100644
--- a/lib/binding_web/package.json
+++ b/lib/binding_web/package.json
@@ -44,6 +44,7 @@
     "esbuild": "^0.24.2",
     "eslint": "^9.18.0",
     "source-map": "^0.7.4",
+    "tsx": "^4.19.2",
     "typescript": "^5.7.3",
     "typescript-eslint": "^8.20.0",
     "vitest": "^3.0.2"
@@ -51,13 +52,16 @@
   "scripts": {
     "build:ts": "esbuild src/index.ts --bundle --platform=neutral --format=cjs --global-name=TreeSitterImpl --outfile=dist/tree-sitter.js --external:fs/* --external:fs/promises --sourcemap --sources-content=true --keep-names",
     "build:wasm": "cd ../../ && cargo xtask build-wasm",
-    "build:sourcemap": "node script/build-sourcemap.js",
+    "build:wasm:debug": "cd ../../ && cargo xtask build-wasm --debug",
+    "build:sourcemap": "tsx script/build-sourcemap.ts",
     "build": "npm run build:ts && npm run build:wasm && npm run build:sourcemap",
-    "build:debug": "npm run build:ts && npm run build:wasm:debug && mkdir -p debug && mv tree-sitter.* debug/",
+    "build:debug": "npm run build:ts && npm run build:wasm:debug && cp debug/* . && npm run build:sourcemap",
+    "lint": "eslint src/*.ts script/*.ts",
+    "lint:fix": "eslint src/*.ts script/*.ts --fix",
     "test": "vitest run",
     "test:watch": "vitest",
     "prepack": "cp ../../LICENSE .",
-    "prepublishOnly": "node script/check-artifacts-fresh.js",
-    "postinstall": "node scripts/postinstall.js"
+    "prepublishOnly": "tsx script/check-artifacts-fresh.ts",
+    "postinstall": "node script/postinstall.js"
   }
 }
diff --git a/lib/binding_web/script/build-sourcemap.js b/lib/binding_web/script/build-sourcemap.ts
similarity index 75%
rename from lib/binding_web/script/build-sourcemap.js
rename to lib/binding_web/script/build-sourcemap.ts
index 08cc1345..e35e0d31 100644
--- a/lib/binding_web/script/build-sourcemap.js
+++ b/lib/binding_web/script/build-sourcemap.ts
@@ -1,20 +1,22 @@
 import { readFileSync, writeFileSync } from 'fs';
-import { SourceMapGenerator, SourceMapConsumer } from 'source-map';
+import { SourceMapGenerator, SourceMapConsumer, RawSourceMap } from 'source-map';
 
 async function fixSourceMap() {
-  const distMap = JSON.parse(readFileSync('dist/tree-sitter.js.map', 'utf8'));
+  const distMap = JSON.parse(readFileSync('dist/tree-sitter.js.map', 'utf8')) as RawSourceMap;
   const distJs = readFileSync('dist/tree-sitter.js', 'utf8').split('\n');
   const finalJs = readFileSync('tree-sitter.js', 'utf8').split('\n');
 
-  const lineMap = new Map();
+  const lineMap = new Map<number, number>();
 
+  let currentFinalLine = 0;
   for (let distLine = 0; distLine < distJs.length; distLine++) {
     const line = distJs[distLine].trim();
     if (!line) continue;
 
-    for (let finalLine = 0; finalLine < finalJs.length; finalLine++) {
+    for (let finalLine = currentFinalLine; finalLine < finalJs.length; finalLine++) {
       if (finalJs[finalLine].trim() === line) {
         lineMap.set(distLine + 1, finalLine + 1);
+        currentFinalLine = finalLine;
         break;
       }
     }
@@ -23,7 +25,7 @@ async function fixSourceMap() {
   const consumer = await new SourceMapConsumer(distMap);
   const generator = new SourceMapGenerator({
     file: 'tree-sitter.js',
-    sourceRoot: ''
+    sourceRoot: '',
   });
 
   consumer.eachMapping(mapping => {
@@ -32,15 +34,15 @@ async function fixSourceMap() {
       generator.addMapping({
         generated: {
           line: finalLine,
-          column: mapping.generatedColumn
+          column: mapping.generatedColumn,
         },
         original: {
           line: mapping.originalLine,
-          column: mapping.originalColumn
+          column: mapping.originalColumn,
         },
         // Fix the source path to be relative to binding_web
         source: `src/${mapping.source.split('/').pop()}`,
-        name: mapping.name
+        name: mapping.name,
       });
     }
   });
@@ -50,7 +52,7 @@ async function fixSourceMap() {
     if (content) {
       generator.setSourceContent(
         `src/${source.split('/').pop()}`,
-        content
+        content,
       );
     }
   }
diff --git a/lib/binding_web/script/check-artifacts-fresh.js b/lib/binding_web/script/check-artifacts-fresh.js
deleted file mode 100755
index 53fb3661..00000000
--- a/lib/binding_web/script/check-artifacts-fresh.js
+++ /dev/null
@@ -1,34 +0,0 @@
-const fs = require('fs');
-const path = require('path');
-
-const inputFiles = [
-  'lib/binding.c',
-  'binding.js',
-  'wasm/exports.txt',
-  'wasm/imports.js',
-  'prefix.js',
-  ...list('../include/tree_sitter'),
-  ...list('../src'),
-];
-
-const outputFiles = ['tree-sitter.js', 'tree-sitter.wasm'];
-
-const outputMtime = Math.min(...outputFiles.map(mtime));
-
-for (const inputFile of inputFiles) {
-  if (mtime(inputFile) > outputMtime) {
-    console.log(`File '${inputFile}' has changed. Re-run 'script/build-wasm'.`);
-    process.exit(1);
-  }
-}
-
-function list(dir) {
-  return fs
-    .readdirSync(path.join(__dirname, dir), 'utf8')
-    .filter((p) => !p.startsWith('.'))
-    .map((p) => path.join(dir, p));
-}
-
-function mtime(p) {
-  return fs.statSync(path.join(__dirname, p)).mtime;
-}
diff --git a/lib/binding_web/script/check-artifacts-fresh.ts b/lib/binding_web/script/check-artifacts-fresh.ts
new file mode 100755
index 00000000..7cf91788
--- /dev/null
+++ b/lib/binding_web/script/check-artifacts-fresh.ts
@@ -0,0 +1,46 @@
+import fs from 'fs';
+import path from 'path';
+import { fileURLToPath } from 'node:url';
+
+const scriptDir = path.dirname(fileURLToPath(import.meta.url));
+
+const inputFiles = [
+  '../lib/tree-sitter.c',
+  '../src/constants.ts',
+  '../src/index.ts',
+  '../src/language.ts',
+  '../src/lookahead_iterator.ts',
+  '../src/marshal.ts',
+  '../src/node.ts',
+  '../src/parser.ts',
+  '../src/query.ts',
+  '../src/tree.ts',
+  '../src/tree_cursor.ts',
+  '../dist/tree-sitter.js',
+  '../wasm/exports.txt',
+  '../wasm/imports.js',
+  '../wasm/prefix.js',
+  ...listFiles('../../include/tree_sitter'),
+  ...listFiles('../../src'),
+];
+
+const outputFiles = ['../tree-sitter.js', '../tree-sitter.wasm'];
+const outputMtime = Math.min(...outputFiles.map(getMtime));
+
+for (const inputFile of inputFiles) {
+  if (getMtime(inputFile) > outputMtime) {
+    console.log(`File '${inputFile}' has changed. Re-run 'npm run build:wasm'.`);
+    process.exit(1);
+  }
+}
+
+function listFiles(dir: string): string[] {
+  return fs
+    .readdirSync(path.resolve(scriptDir, dir))
+    .filter(p => !p.startsWith('.'))
+    .map(p => path.join(dir, p));
+}
+
+function getMtime(p: string): number {
+  return fs.statSync(path.resolve(scriptDir, p)).mtime.getTime();
+}
diff --git a/lib/binding_web/script/postinstall.js b/lib/binding_web/script/postinstall.js
index 4c2478f7..b673d19b 100644
--- a/lib/binding_web/script/postinstall.js
+++ b/lib/binding_web/script/postinstall.js
@@ -1,25 +1,24 @@
 import fs from 'fs';
 import path from 'path';
 
-const isDebug = process.env.npm_config_web_tree_sitter_debug === 'true';
+const isDebug = process.env.npm_config_debug === 'true';
 
 if (isDebug) {
   // Copy debug versions to root
   fs.copyFileSync(
     path.join(__dirname, '../debug/tree-sitter.js'),
-    path.join(__dirname, '../tree-sitter.js')
+    path.join(__dirname, '../tree-sitter.js'),
   );
   fs.copyFileSync(
     path.join(__dirname, '../debug/tree-sitter.wasm'),
-    path.join(__dirname, '../tree-sitter.wasm')
+    path.join(__dirname, '../tree-sitter.wasm'),
   );
-  // Copy sourcemaps too
   fs.copyFileSync(
     path.join(__dirname, '../debug/tree-sitter.js.map'),
-    path.join(__dirname, '../tree-sitter.js.map')
+    path.join(__dirname, '../tree-sitter.js.map'),
   );
   fs.copyFileSync(
     path.join(__dirname, '../debug/tree-sitter.wasm.map'),
-    path.join(__dirname, '../tree-sitter.wasm.map')
+    path.join(__dirname, '../tree-sitter.wasm.map'),
   );
 }