noonat · dependabot · Jan 28, 2020 · Aug 5, 2026 · Aug 5, 2026 · Aug 5, 2026
diff --git a/.github/dependabot.yml b/.github/dependabot.yml
@@ -0,0 +1,16 @@
+version: 2
+updates:
+  - package-ecosystem: npm
+    directory: /
+    schedule:
+      interval: monthly
+    # Nothing here is inherited by anyone using the library, so a pull
+    # request per transitive advisory in the docs toolchain is just
+    # noise. Only direct dependencies are actionable, and one grouped
+    # pull request a month is enough.
+    allow:
+      - dependency-type: direct
+    groups:
+      dependencies:
+        patterns:
+          - "*"
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
@@ -0,0 +1,52 @@
+name: CI
+
+on:
+  push:
+    branches: ["**"]
+  pull_request:
+    branches: [master]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        node-version: [20, 22, 24]
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: ${{ matrix.node-version }}
+          cache: npm
+
+      # `npm ci` runs the `prepare` script, which builds the annotated docs,
+      # the library, and the example bundle. Installing is therefore also a
+      # build check.
+      - run: npm ci
+
+      - run: npm test
+
+  # The tests above check that the library works on several versions of Node.
+  # This job is a different question: whether the build output committed to
+  # the repository is what the build actually produces. It runs on a single
+  # version of Node, because that is the claim being made.
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 22
+          cache: npm
+
+      - run: npm ci
+
+      - name: Check committed build output is current
+        run: |
+          if [ -n "$(git status --porcelain)" ]; then
+            echo "Committed build output is stale."
+            echo "Run 'npm run build' and commit the result."
+            git status --short
+            exit 1
+          fi
diff --git a/.travis.yml b/.travis.yml
diff --git a/README.md b/README.md
@@ -1,4 +1,4 @@
-JavaScript 2D Collision Detection [![Build Status][travis_image]][travis]
+JavaScript 2D Collision Detection [![Build Status][ci_image]][ci]
 =================================
 
 Intersect is a collection of common 2D collision detection tests, written as a
@@ -20,10 +20,14 @@ portable to your language of choice. To get started, take a look at:
 Note that the compiled JavaScript source is also available in the lib folder,
 if you find TypeScript difficult to read.
 
+If you'd rather use it than port it, it's on npm, with type declarations:
+
+    npm install @noonat/intersect
+
 [annotated]: http://noonat.github.io/intersect
 [examples]: https://github.com/noonat/intersect/blob/master/src/examples.ts
 [intersect]: https://github.com/noonat/intersect/blob/master/src/intersect.ts
 [rtcd]: http://realtimecollisiondetection.net/
 [algorithms]: http://www.realtimerendering.com/intersections.html
-[travis]: http://travis-ci.org/noonat/intersect
-[travis_image]: https://secure.travis-ci.org/noonat/intersect.png?branch=master
+[ci]: https://github.com/noonat/intersect/actions/workflows/ci.yml
+[ci_image]: https://github.com/noonat/intersect/actions/workflows/ci.yml/badge.svg
diff --git a/build.js b/build.js
@@ -1,39 +1,33 @@
 const { execFile } = require("child_process");
-const { readFile, rename, unlink, writeFile } = require("fs").promises;
+const { readFile, unlink, writeFile } = require("fs").promises;
+const { promisify } = require("util");
+const esbuild = require("esbuild");
 const md = require("markdown-it")();
 const prettier = require("prettier");
 
-async function compileHTML() {
-  execFile(
-    "docco",
-    [
-      "--css",
-      "template/docco.css",
-      "--template",
-      "template/docco.jst",
-      "src/intersect.ts.md"
-    ],
-    async (err, stdout, stderr) => {
-      if (err) {
-        console.log("ERROR: docco failed");
-        console.log("docco stdout:", stdout);
-        console.log("docco stderr:", stderr);
-        throw err;
-      }
-      const data = await readFile("docs/src/intersect.ts.html", {
-        encoding: "utf-8"
-      });
-      const html = prettier.format(data, { parser: "html" });
-      await writeFile("index.html", html, { encoding: "utf-8" });
-      await unlink("docs/src/intersect.ts.html");
-    }
-  );
+const isProduction = process.env.NODE_ENV === "production";
+
+const execFileAsync = promisify(execFile);
+
+// Each of these tools reports its own errors on stdout or stderr, and none of
+// that is much use if it is thrown away, so print it before giving up.
+async function run(command, args = []) {
+  try {
+    return await execFileAsync(command, args);
+  } catch (err) {
+    console.log(`ERROR: ${command} failed`);
+    console.log(`${command} stdout:`, err.stdout);
+    console.log(`${command} stderr:`, err.stderr);
+    throw err;
+  }
 }
 
-async function compileScript() {
+// The literate source is the real source. Pull the code blocks back out of it
+// to get something the compiler can read.
+async function compileSource() {
   const data = await readFile("src/intersect.ts.md");
 
-  let blocks = ['"use strict";\n\n'];
+  const blocks = ['"use strict";\n\n'];
   md.renderer.rules = {
     code_block(tokens, index) {
       // We can't express empty lines for readability in Markdown, since most
@@ -47,28 +41,64 @@ async function compileScript() {
   };
   md.render(data.toString("UTF-8"));
 
-  const source = prettier.format(blocks.join(""), { parser: "typescript" });
+  const source = await prettier.format(blocks.join(""), {
+    parser: "typescript"
+  });
   await writeFile("src/intersect.ts", source);
+}
 
-  execFile("tsc", (err, stdout, stderr) => {
-    if (err) {
-      console.log("ERROR: tsc failed");
-      console.log("tsc stdout:", stdout);
-      console.log("tsc stderr:", stderr);
-      throw err;
-    }
+async function compileHTML() {
+  await run("docco", [
+    "--css",
+    "template/docco.css",
+    "--template",
+    "template/docco.jst",
+    "src/intersect.ts.md"
+  ]);
+  const data = await readFile("docs/src/intersect.ts.html", {
+    encoding: "utf-8"
   });
+  const html = await prettier.format(data, { parser: "html" });
+  await writeFile("index.html", html, { encoding: "utf-8" });
+  await unlink("docs/src/intersect.ts.html");
+}
 
-  execFile("webpack", (err, stdout, stderr) => {
-    if (err) {
-      console.log("ERROR: webpack failed");
-      console.log("webpack stdout", stdout);
-      console.log("webpack stderr", stderr);
-      throw err;
-    }
+async function compileLibrary() {
+  await run("tsc");
+}
+
+async function compileExamples() {
+  // esbuild only strips the types off, so the examples are type checked
+  // separately. Without this they aren't checked by anything at all.
+  await run("tsc", ["--project", "tsconfig.examples.json"]);
+
+  // Importing the stylesheet writes docs/bundle.css, which the docs template
+  // links. Fonts larger than the inline limit are written next to it.
+  await esbuild.build({
+    assetNames: "[hash]",
+    bundle: true,
+    entryPoints: ["src/examples.ts"],
+    loader: {
+      ".eot": "file",
+      ".svg": "file",
+      ".ttf": "file",
+      ".woff": "file",
+      ".woff2": "file"
+    },
+    minify: isProduction,
+    outfile: "docs/bundle.js",
+    sourcemap: !isProduction,
+    target: "es2015"
   });
 }
 
-Promise.all([compileHTML(), compileScript()]).catch(err => {
-  throw err;
+async function main() {
+  // Everything below reads src/intersect.ts, so it has to exist first.
+  await compileSource();
+  await Promise.all([compileHTML(), compileLibrary(), compileExamples()]);
+}
+
+main().catch(err => {
+  console.log(err.message);
+  process.exitCode = 1;
 });
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