Force nextjs cache tu be updated when icons have changed

Author: garronej

package.json

@@ -12,7 +12,7 @@
         "build": "rimraf dist/ && tsc -p src/bin && yarn copy_dsfr_dist_to_root && yarn css_to_ts && tsc -p src && yarn grant_exec_perms",
         "test": "vitest",
         "start_cra": "yarn yarn_link && cd test/integration/cra && yarn start",
-        "start_next": "yarn yarn_link && cd test/integration/next && rm -rf .next && yarn dev",
+        "start_next": "yarn yarn_link && cd test/integration/next && yarn dev",
         "start_vite": "yarn yarn_link && cd test/integration/vite && yarn dev",
         "lint:check": "eslint . --ext .ts,.tsx",
         "lint": "yarn lint:check --fix",

src/bin/only_include_used_icons.ts

@@ -8,7 +8,7 @@ import * as fs from "fs";
 import { join as pathJoin } from "path";
 import { assert } from "tsafe/assert";
 import { exclude } from "tsafe/exclude";
-import { writeFile, readFile } from "fs/promises";
+import { writeFile, readFile, rm } from "fs/promises";
 import { crawl } from "./tools/crawl";
 import { basename as pathBasename } from "path";
 import type { Equals } from "tsafe";
@@ -149,6 +149,16 @@ import type { Equals } from "tsafe";
         "utf8"
     );
 
+    const onConfirmedChange = async () => {
+        const nextCacheDir = pathJoin(cwd, ".next", "cache");
+
+        if (!fs.existsSync(nextCacheDir)) {
+            return;
+        }
+
+        rm(nextCacheDir, { "recursive": true, "force": true });
+    };
+
     [
         dsfrDistDirPath,
         ...(() => {
@@ -173,11 +183,18 @@ import type { Equals } from "tsafe";
                 )
             );
 
-        ["icons.css", "icons.min.css"].forEach(cssFileBasename =>
-            writeFile(
-                pathJoin(dsfrDistDirPath, "utility", "icons", cssFileBasename),
-                rawIconCssCodeBuffer
-            )
-        );
+        ["icons.css", "icons.min.css"].forEach(async cssFileBasename => {
+            const filePath = pathJoin(dsfrDistDirPath, "utility", "icons", cssFileBasename);
+
+            const currentCode = await readFile(filePath);
+
+            if (Buffer.compare(rawIconCssCodeBuffer, currentCode) === 0) {
+                return;
+            }
+
+            onConfirmedChange();
+
+            writeFile(filePath, rawIconCssCodeBuffer);
+        });
     });
 })();