build(srcts): Convert Flow to TypeScript and build with esbuild

.Rbuildignore

@@ -6,19 +6,14 @@
 ^.*\.Rproj$
 ^\.Rproj\.user$
 ^LICENSE\.md$
-^srcjs
-^\.babelrc$
-^\.eslintrc\.js$
-^\.flowconfig$
-^Gruntfile\.js$
+^srcts
 ^package\.json$
 ^prettier\.config\.js$
 ^package-lock\.json$
+^tsconfig\.json$
 ^CODE_OF_CONDUCT\.md$
 ^node_modules
 ^bin
-^inst/reactlog/reactlogAsset/report\.html$
-^flow-typed
 ^_ignore
 ^\.lintr$
 .*\.js\.map$
@@ -37,3 +32,4 @@
 ^\.context$
 ^\.git$
 ^\.conductor$
+^\.playwright-mcp$

.github/workflows/shiny-target.yaml

@@ -0,0 +1,24 @@
+# Keep the JS build target in step with rstudio/shiny.
+# Runs weekly too, because shiny can change without a reactlog PR.
+on:
+  pull_request:
+    paths:
+      - "tsconfig.json"
+      - "package.json"
+      - "bin/check_shiny_target.js"
+      - ".github/workflows/shiny-target.yaml"
+  schedule:
+    - cron: "0 9 * * 1"
+  workflow_dispatch:
+
+name: Shiny build target
+
+jobs:
+  check:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v5
+      - uses: actions/setup-node@v5
+        with:
+          node-version: 22
+      - run: npm run check-shiny-target

.gitignore

@@ -43,7 +43,6 @@ vignettes/*.pdf
 rsconnect/
 
 .Rproj.user
-inst/reactlog/reactlogAsset/report.html
 node_modules
 npm-debug.log*
 src_old
@@ -58,3 +57,4 @@ _ignore
 !/.agents/skills/
 /.agents/skills/*
 !/.agents/skills/memory-bank/
+.playwright-mcp/

bin/check_shiny_target.js

@@ -0,0 +1,71 @@
+#!/usr/bin/env node
+// Fail if reactlog's tsc / esbuild targets differ from rstudio/shiny's.
+// The viewer only runs inside Shiny apps, so it should need no newer browser
+// than Shiny does, and gains nothing from an older target.
+// Usage: node bin/check_shiny_target.js [shiny-ref]   (default: main)
+
+const fs = require("fs");
+const path = require("path");
+
+const ref = process.argv[2] || "main";
+const root = path.join(__dirname, "..");
+const shinyUrl = file =>
+  `https://raw.githubusercontent.com/rstudio/shiny/${ref}/${file}`;
+
+async function fetchText(file) {
+  const res = await fetch(shinyUrl(file));
+  if (!res.ok) throw new Error(`${res.status} fetching ${shinyUrl(file)}`);
+  return res.text();
+}
+
+function match(text, regex, what) {
+  const m = text.match(regex);
+  if (!m) throw new Error(`Could not find ${what}`);
+  return m[1].toLowerCase();
+}
+
+async function main() {
+  const shinyTsconfig = await fetchText("tsconfig.json");
+  const shinyBuild = await fetchText("srcts/build/_build.ts");
+
+  // tsconfig.json files may have comments, so read them with a regex
+  const tsconfig = fs.readFileSync(path.join(root, "tsconfig.json"), "utf8");
+  const buildOnly = JSON.parse(
+    fs.readFileSync(path.join(root, "package.json"), "utf8")
+  ).scripts["build-only"];
+
+  const targets = [
+    [
+      "shiny tsconfig.json target",
+      match(shinyTsconfig, /"target":\s*"([^"]+)"/, "target in shiny tsconfig.json"),
+    ],
+    [
+      "shiny srcts/build/_build.ts esbuild target",
+      match(shinyBuild, /target:\s*"([^"]+)"/, "target in shiny _build.ts"),
+    ],
+    [
+      "reactlog tsconfig.json target",
+      match(tsconfig, /"target":\s*"([^"]+)"/, "target in tsconfig.json"),
+    ],
+    [
+      "reactlog package.json build-only --target",
+      match(buildOnly, /--target=(\S+)/, "--target in build-only"),
+    ],
+  ];
+
+  for (const [name, value] of targets) console.log(`${value}\t${name}`);
+
+  if (new Set(targets.map(([, value]) => value)).size !== 1) {
+    console.error(
+      `\nTargets differ from rstudio/shiny@${ref}. Update tsconfig.json ` +
+        "(target and lib) and the build-only script in package.json to match, " +
+        "then rebuild."
+    );
+    process.exit(1);
+  }
+}
+
+main().catch(err => {
+  console.error(err.message);
+  process.exit(1);
+});

bin/clean_rlog_file.sh

@@ -2,6 +2,6 @@
 
 # should be used with `npm run fix FILE`
 
-npm run lint -- "$@"
+npm run typecheck
 
 npm run build-only