chore: migrate code to ESM

.github/workflows/test.yml

@@ -11,9 +11,17 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-latest, windows-latest, macos-latest]
+        os:
+          - ubuntu-latest
+          - windows-latest
+          - macos-latest
         deno:
-          [1.x, "1.33.1", canary, ~1.32, b290fd01f3f5d32f9d010fc719ced0240759c049, rc]
+          - "1.x"
+          - "1.33.1"
+          - "canary"
+          - "~1.32"
+          - "b290fd01f3f5d32f9d010fc719ced0240759c049"
+          - "rc"
 
     steps:
       - uses: actions/checkout@v3
@@ -38,14 +46,6 @@ jobs:
           deno install --allow-net -n deno_curl https://deno.land/std@0.198.0/examples/curl.ts
           deno_curl https://deno.land/std@0.198.0/examples/curl.ts
 
-      - name: Format
-        if: runner.os == 'Linux' && matrix.deno == 'canary'
-        run: npm run fmt:check
-
-      - name: Lint
-        if: runner.os == 'Linux' && matrix.deno == 'canary'
-        run: npm run lint
-
   test-version-file:
     runs-on: ubuntu-latest
     strategy:
@@ -66,7 +66,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ ubuntu-latest, windows-latest, macos-latest ]
+        os: [ubuntu-latest, windows-latest, macos-latest]
     steps:
       - uses: actions/checkout@v3
 
@@ -77,3 +77,22 @@ jobs:
 
       - name: Check binary exists
         run: deno_foo -V
+
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Setup Deno
+        uses: ./
+        with:
+          deno-version: "rc"
+
+      - name: Lint
+        run: deno lint
+
+      - name: Format
+        run: deno fmt --check
+
+      - name: Check types
+        run: deno check main.mjs

action.yml

@@ -22,4 +22,4 @@ outputs:
     description: "The release channel of the installed version."
 runs:
   using: "node20"
-  main: "main.js"
+  main: "main.mjs"

deno.json

@@ -0,0 +1,6 @@
+{
+  "compilerOptions": {
+    "checkJs": true,
+    "allowJs": true
+  }
+}

main.js → main.mjs

@@ -1,12 +1,11 @@
-const process = require("process");
-const core = require("@actions/core");
-
-const {
-  parseVersionRange,
+import process from "node:process";
+import core from "@actions/core";
+import {
   getDenoVersionFromFile,
+  parseVersionRange,
   resolveVersion,
-} = require("./src/version.js");
-const { install } = require("./src/install.js");
+} from "./src/version.mjs";
+import { install } from "./src/install.mjs";
 
 /**
  * @param {string} message
@@ -46,7 +45,7 @@ async function main() {
 
     core.info("Installation complete.");
   } catch (err) {
-    core.setFailed(err);
+    core.setFailed((err instanceof Error) ? err : String(err));
     process.exit();
   }
 }