Added a badge to display the monthly ramp

scripts/build.mjs

@@ -1,7 +1,8 @@
-import { mkdir, readFile, rm, writeFile } from "node:fs/promises";
+import { mkdir, readFile } from "node:fs/promises";
 import path from "node:path";
 import { fileURLToPath } from "node:url";
 import composition from "./compose.cjs";
+import output from "./write-output.cjs";
 
 const rootDir = path.resolve(path.dirname(fileURLToPath(import.meta.url)), "..");
 const distDir = path.join(rootDir, "dist");
@@ -61,10 +62,6 @@ const targets = [
   }
 ];
 
-if (!checkOnly) {
-  await rm(distDir, { recursive: true, force: true });
-}
-
 for (const target of targets) {
   const manifestJson = `${JSON.stringify(target.manifest, null, 2)}\n`;
   JSON.parse(manifestJson);
@@ -80,9 +77,9 @@ for (const target of targets) {
 
   const outputDir = path.join(distDir, target.name);
   await mkdir(outputDir, { recursive: true });
-  await writeFile(path.join(outputDir, "manifest.json"), manifestJson);
-  await writeFile(path.join(outputDir, "content.js"), contentScript);
-  await writeFile(path.join(outputDir, "background.js"), backgroundScript);
+  await output.writeOutput(path.join(outputDir, "content.js"), contentScript);
+  await output.writeOutput(path.join(outputDir, "background.js"), backgroundScript);
+  await output.writeOutput(path.join(outputDir, "manifest.json"), manifestJson);
 }
 
 if (!checkOnly) {

scripts/write-output.cjs

@@ -0,0 +1,20 @@
+const fs = require("node:fs/promises");
+const { randomUUID } = require("node:crypto");
+
+async function writeOutput(file, contents, io = fs) {
+  try {
+    if (await io.readFile(file, "utf8") === contents) return;
+  } catch (error) {
+    if (error.code !== "ENOENT") throw error;
+  }
+  // Replace a complete file; never remove or truncate a script the browser may load.
+  const temporary = `${file}.${randomUUID()}.tmp`;
+  try {
+    await io.writeFile(temporary, contents, { encoding: "utf8", flag: "wx" });
+    await io.rename(temporary, file);
+  } finally {
+    await io.rm(temporary, { force: true });
+  }
+}
+
+module.exports = { writeOutput };