chore: add deno task gen to generate mod.ts files

Author: lambdalisue

.scripts/gen-mod.ts

@@ -0,0 +1,115 @@
+import { fromFileUrl, globToRegExp, join, relative } from "@std/path";
+import { flatMap } from "@core/iterutil/async/flat-map";
+
+const decoder = new TextDecoder();
+
+const excludes = [
+  "mod.ts",
+  "*_test.ts",
+  "*_bench.ts",
+  "_*.ts",
+];
+
+type DenoDocEntry = {
+  name: string;
+  location: {
+    filename: string;
+  };
+  declarationKind: string;
+  jsDoc: {
+    doc: string;
+  };
+  kind: string;
+};
+
+function isDenoDocEntry(x: unknown): x is DenoDocEntry {
+  if (x == null || typeof x !== "object") return false;
+  if (typeof (x as DenoDocEntry).name !== "string") return false;
+  if (typeof (x as DenoDocEntry).location !== "object") return false;
+  if (typeof (x as DenoDocEntry).location.filename !== "string") return false;
+  if (typeof (x as DenoDocEntry).declarationKind !== "string") return false;
+  if (typeof (x as DenoDocEntry).jsDoc !== "object") return false;
+  if (typeof (x as DenoDocEntry).jsDoc.doc !== "string") return false;
+  if (typeof (x as DenoDocEntry).kind !== "string") return false;
+  return true;
+}
+
+async function listDenoDocEntries(path: string): Promise<DenoDocEntry[]> {
+  const cmd = new Deno.Command(Deno.execPath(), {
+    args: ["doc", "--json", path],
+    stdout: "piped",
+    stderr: "piped",
+  });
+  const { success, stdout, stderr } = await cmd.output();
+  if (!success) {
+    throw new Error(decoder.decode(stderr));
+  }
+  const json = JSON.parse(decoder.decode(stdout));
+  if (!Array.isArray(json)) {
+    throw new Error(`Expected array but got ${JSON.stringify(json)}`);
+  }
+  return json.filter(isDenoDocEntry);
+}
+
+async function* iterModules(path: string): AsyncIterable<string> {
+  const patterns = excludes.map((p) => globToRegExp(p));
+  for await (const entry of Deno.readDir(path)) {
+    if (!entry.isFile || !entry.name.endsWith(".ts")) continue;
+    if (patterns.some((p) => p.test(entry.name))) continue;
+    yield join(path, entry.name);
+  }
+}
+
+async function generateModTs(
+  namespace: string,
+): Promise<void> {
+  const path = fromFileUrl(import.meta.resolve(`../${namespace}/`));
+  const exports = (await Array.fromAsync(
+    flatMap(iterModules(path), (x) => listDenoDocEntries(x)),
+  ))
+    .filter((x) => x.kind === "function")
+    .filter((x) => x.declarationKind === "export")
+    .filter((x) => x.name.startsWith(namespace))
+    .map((x) => ({
+      path: relative(path, fromFileUrl(x.location.filename)),
+      name: x.name,
+      doc: x.jsDoc.doc,
+    }))
+    .toSorted((a, b) => a.name.localeCompare(b.name));
+  const lines = [
+    "// NOTE: This file is generated by gen-mod.ts",
+    ...exports.map((x) => {
+      return `import { ${x.name} } from "./${x.path}";`;
+    }),
+    "",
+    `export const ${namespace}: {`,
+    ...exports.flatMap((x) => {
+      return [
+        "  /**",
+        ...x.doc.split("\n").map((line) => `   * ${line}`.trimEnd()),
+        "   */",
+        `  ${x.name.replace(namespace, "")}: typeof ${x.name};`.trimEnd(),
+      ];
+    }),
+    "} = {",
+    ...exports.flatMap((x) => {
+      return [
+        `  ${x.name.replace(namespace, "")}: ${x.name},`.trimEnd(),
+      ];
+    }),
+    "};",
+  ];
+  await Deno.writeTextFile(join(path, "mod.ts"), lines.join("\n") + "\n");
+}
+
+async function main(): Promise<void> {
+  await generateModTs("is");
+  await generateModTs("as");
+}
+
+if (import.meta.main) {
+  main().catch((err) => {
+    console.error(err);
+    Deno.exit(1);
+  });
+}

deno.jsonc

@@ -66,6 +66,7 @@
     ]
   },
   "imports": {
+    "@core/iterutil": "jsr:@core/iterutil@^0.3.0",
     "@core/unknownutil": "./mod.ts",
     "@deno/dnt": "jsr:@deno/dnt@^0.41.1",
     "@std/assert": "jsr:@std/assert@^0.221.0",
@@ -78,6 +79,7 @@
     "test": "deno test -A --doc --parallel --shuffle",
     "test:coverage": "deno task test --coverage=.coverage",
     "coverage": "deno coverage .coverage",
+    "gen": "deno run --allow-run=deno --allow-read --allow-write=. .scripts/gen-mod.ts",
     "update": "deno run --allow-env --allow-read --allow-write=. --allow-run=git,deno --allow-net=jsr.io,registry.npmjs.org jsr:@molt/cli ./*.ts",
     "update:commit": "deno task -q update --commit --prefix deps: --pre-commit=fmt,lint"
   }