feat: add built-in caching via inputs (#89)

2025-12-10 10:26:45 +00:00 · 2025-05-12 18:53:44 +02:00
parent a1496dd8d9
commit fd6b0ad149
14 changed files with 63237 additions and 19455 deletions
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -80,6 +80,41 @@ jobs:
      - name: Check binary exists
        run: deno_foo -V

+  test-setup-cache:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest]
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup Deno
+        uses: ./
+        with:
+          cache: true
+          cache-hash: ${{ hashFiles('**/deno.lock') }}
+
+      - name: Download dependencies for cache
+        run: deno install --global --no-config npm:cowsay@1.6.0
+
+  test-cache:
+    needs: test-setup-cache
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest]
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup Deno
+        uses: ./
+        with:
+          cache: true
+          cache-hash: ${{ hashFiles('**/deno.lock') }}
+
+      - name: Run with cached dependencies
+        run: deno run --cached-only --no-config -RE npm:cowsay@1.6.0 "It works!"
+
  lint:
    runs-on: ubuntu-latest
    steps:
--- a/README.md
+++ b/README.md
@@ -141,3 +141,23 @@ number.

 - run: echo "Deno version is ${{ steps.deno.outputs.deno-version }}"
 ```
+
+### Caching dependencies downloaded by Deno automatically
+
+Dependencies installed by Deno can be cached automatically, which is similar to
+the [`cache` option in `setup-node`](https://github.com/actions/setup-node).
+
+To enable the cache, use `cache: true`. It's recommended to also add the
+`cache-hash` property, to scope caches based on lockfile changes.
+
+```yaml
+- uses: denoland/setup-deno@v2
+  with:
+    cache: true
+    cache-hash: ${{ hashFiles('**/deno.lock') }}
+```
+
+> [!WARNING]
+> If an environment variable `DENO_DIR` is set for steps that run/download
+> dependencies, then `DENO_DIR` must also be set for the `denoland/setup-deno`
+> action, for the caching to work as intended.
--- a/action.yml
+++ b/action.yml
@@ -13,7 +13,14 @@ inputs:
  deno-binary-name:
    description: The name to use for the binary.
    default: "deno"
+  cache:
+    description: Cache downloaded modules & packages automatically in GitHub Actions cache.
+    default: "false"
+  cache-hash:
+    description: A hash used as part of the cache key. Use e.g. `$\{{ hashFiles('**/deno.lock') }}` to cache based on the lockfile contents.
 outputs:
+  cache-hit:
+    description: A boolean indicating whether the cache was hit.
  deno-version:
    description: "The Deno version that was installed."
  release-channel:
@@ -21,3 +28,5 @@ outputs:
 runs:
  using: "node20"
  main: "dist/main.mjs"
+  post: "dist/post.mjs"
+  post-if: always()
--- a/deno.json
+++ b/deno.json
@@ -14,6 +14,7 @@
    "build": "deno run -A scripts/build.ts"
  },
  "imports": {
+    "@actions/cache": "npm:@actions/cache@^4.0.3",
    "@actions/core": "npm:@actions/core@^1.11.1",
    "@actions/tool-cache": "npm:@actions/tool-cache@^2.0.2",
    "@types/node": "npm:@types/node@^22.15.0",
--- a/deno.lock
+++ b/deno.lock
@@ -1,6 +1,7 @@
 {
  "version": "5",
  "specifiers": {
+    "npm:@actions/cache@^4.0.3": "4.0.3",
    "npm:@actions/core@^1.11.1": "1.11.1",
    "npm:@actions/tool-cache@^2.0.2": "2.0.2",
    "npm:@types/node@*": "22.15.15",
@@ -11,6 +12,21 @@
    "npm:undici@^7.8.0": "7.9.0"
  },
  "npm": {
+    "@actions/cache@4.0.3": {
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+      "dependencies": [
+        "@actions/core",
+        "@actions/exec",
+        "@actions/glob",
+        "@actions/http-client",
+        "@actions/io",
+        "@azure/abort-controller@1.1.0",
+        "@azure/ms-rest-js",
+        "@azure/storage-blob",
+        "@protobuf-ts/plugin",
+        "semver@6.3.1"
+      ]
+    },
    "@actions/core@1.11.1": {
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      "dependencies": [
@@ -24,6 +40,13 @@
        "@actions/io"
      ]
    },
+    "@actions/glob@0.1.2": {
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+      "dependencies": [
+        "@actions/core",
+        "minimatch"
+      ]
+    },
    "@actions/http-client@2.2.3": {
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      "dependencies": [
@@ -44,6 +67,132 @@
        "semver@6.3.1"
      ]
    },
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+      "dependencies": [
+        "tslib@2.8.1"
+      ]
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+        "tslib@2.8.1"
+      ]
+    },
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+        "@azure/core-auth",
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+        "@azure/core-auth",
+        "abort-controller",
+        "form-data",
+        "node-fetch",
+        "tslib@1.14.1",
+        "tunnel",
+        "uuid",
+        "xml2js"
+      ]
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+        "@azure/core-auth",
+        "@azure/core-client",
+        "@azure/core-http-compat",
+        "@azure/core-lro",
+        "@azure/core-paging",
+        "@azure/core-rest-pipeline",
+        "@azure/core-tracing",
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+        "@azure/core-xml",
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@@ -250,6 +399,37 @@
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+        "@protobuf-ts/plugin-framework",
+        "@protobuf-ts/protoc",
+        "@protobuf-ts/runtime",
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+      ]
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@@ -321,7 +501,7 @@
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-        "tslib"
+        "tslib@2.8.1"
      ]
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@@ -339,16 +519,33 @@
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    },
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+      "dependencies": [
+        "http-proxy-agent",
+        "https-proxy-agent",
+        "tslib@2.8.1"
+      ]
+    },
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      "dependencies": [
        "valibot"
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+        "event-target-shim"
+      ]
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@@ -359,15 +556,44 @@
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+        "balanced-match",
+        "concat-map"
+      ]
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@@ -393,9 +622,51 @@
        "pathe"
      ]
    },
+    "dunder-proto@1.0.1": {
+      "integrity": "sha512-KIN/nDJBQRcXw0MLVhZE9iQHmG68qAVIBg9CqmUYjmQIhgij9U5MFvrqkUL5FbtyyzZuOeOt0zdeRe4UY7ct+A==",
+      "dependencies": [
+        "call-bind-apply-helpers",
+        "es-errors",
+        "gopd"
+      ]
+    },
    "empathic@1.1.0": {
      "integrity": "sha512-rsPft6CK3eHtrlp9Y5ALBb+hfK+DWnA4WFebbazxjWyx8vSm3rZeoM3z9irsjcqO3PYRzlfv27XIB4tz2DV7RA=="
    },
+    "es-define-property@1.0.1": {
+      "integrity": "sha512-e3nRfgfUZ4rNGL232gUgX06QNyyez04KdjFrF+LTRoOXmrOgFKDg4BCdsjW8EnT69eqdYGmRpJwiPVYNrCaW3g=="
+    },
+    "es-errors@1.3.0": {
+      "integrity": "sha512-Zf5H2Kxt2xjTvbJvP2ZWLEICxA6j+hAmMzIlypy4xcBg1vKVnx89Wy0GbS+kf5cwCVFFzdCFh2XSCFNULS6csw=="
+    },
+    "es-object-atoms@1.1.1": {
+      "integrity": "sha512-FGgH2h8zKNim9ljj7dankFPcICIK9Cp5bm+c2gQSYePhpaG5+esrLODihIorn+Pe6FGJzWhXQotPv73jTaldXA==",
+      "dependencies": [
+        "es-errors"
+      ]
+    },
+    "es-set-tostringtag@2.1.0": {
+      "integrity": "sha512-j6vWzfrGVfyXxge+O0x5sh6cvxAog0a/4Rdd2K36zCMV5eJ+/+tOAngRO8cODMNWbVRdVlmGZQL2YS3yR8bIUA==",
+      "dependencies": [
+        "es-errors",
+        "get-intrinsic",
+        "has-tostringtag",
+        "hasown"
+      ]
+    },
+    "event-target-shim@5.0.1": {
+      "integrity": "sha512-i/2XbnSz/uxRCU6+NdVJgKWDTM427+MqYbkQzD321DuCQJUqOuJKIA0IM2+W2xtYHdKOmZ4dR6fExsd4SXL+WQ=="
+    },
+    "events@3.3.0": {
+      "integrity": "sha512-mQw+2fkQbALzQ7V0MY0IqdnXNOeTtP4r0lN9z7AAawCXgqea7bDii20AYrIBrFd/Hx0M2Ocz6S111CaFkUcb0Q=="
+    },
+    "fast-xml-parser@5.2.3": {
+      "integrity": "sha512-OdCYfRqfpuLUFonTNjvd30rCBZUneHpSQkCqfaeWQ9qrKcl6XlWeDBNVwGb+INAIxRshuN2jF+BE0L6gbBO2mw==",
+      "dependencies": [
+        "strnum"
+      ],
+      "bin": true
+    },
    "fdir@6.4.4_picomatch@4.0.2": {
      "integrity": "sha512-1NZP+GK4GfuAv3PqKvxQRDMjdSRZjnkq7KfhlNrCNNlZ0ygQFpebfrnfnq/W7fpUnAv9aGWmY1zKx7FYL3gwhg==",
      "dependencies": [
@@ -405,15 +676,82 @@
        "picomatch"
      ]
    },
+    "form-data@2.5.3": {
+      "integrity": "sha512-XHIrMD0NpDrNM/Ckf7XJiBbLl57KEhT3+i3yY+eWm+cqYZJQTZrKo8Y8AWKnuV5GT4scfuUGt9LzNoIx3dU1nQ==",
+      "dependencies": [
+        "asynckit",
+        "combined-stream",
+        "es-set-tostringtag",
+        "mime-types",
+        "safe-buffer"
+      ]
+    },
+    "function-bind@1.1.2": {
+      "integrity": "sha512-7XHNxH7qX9xG5mIwxkhumTox/MIRNcOgDrxWsMt2pAr23WHp6MrRlN7FBSFpCpr+oVO0F744iUgR82nJMfG2SA=="
+    },
+    "get-intrinsic@1.3.0": {
+      "integrity": "sha512-9fSjSaos/fRIVIp+xSJlE6lfwhES7LNtKaCBIamHsjr2na1BiABJPo0mOjjz8GJDURarmCPGqaiVg5mfjb98CQ==",
+      "dependencies": [
+        "call-bind-apply-helpers",
+        "es-define-property",
+        "es-errors",
+        "es-object-atoms",
+        "function-bind",
+        "get-proto",
+        "gopd",
+        "has-symbols",
+        "hasown",
+        "math-intrinsics"
+      ]
+    },
+    "get-proto@1.0.1": {
+      "integrity": "sha512-sTSfBjoXBp89JvIKIefqw7U2CCebsc74kiY6awiGogKtoSGbgjYE/G/+l9sF3MWFPNc9IcoOC4ODfKHfxFmp0g==",
+      "dependencies": [
+        "dunder-proto",
+        "es-object-atoms"
+      ]
+    },
    "get-tsconfig@4.10.0": {
      "integrity": "sha512-kGzZ3LWWQcGIAmg6iWvXn0ei6WDtV26wzHRMwDSzmAbcXrTEXxHy6IehI6/4eT6VRKyMP1eF1VqwrVUmE/LR7A==",
      "dependencies": [
        "resolve-pkg-maps"
      ]
    },
+    "gopd@1.2.0": {
+      "integrity": "sha512-ZUKRh6/kUFoAiTAtTYPZJ3hw9wNxx+BIBOijnlG9PnrJsCcSjs1wyyD6vJpaYtgnzDrKYRSqf3OO6Rfa93xsRg=="
+    },
+    "has-symbols@1.1.0": {
+      "integrity": "sha512-1cDNdwJ2Jaohmb3sg4OmKaMBwuC48sYni5HUw2DvsC8LjGTLK9h+eb1X6RyuOHe4hT0ULCW68iomhjUoKUqlPQ=="
+    },
+    "has-tostringtag@1.0.2": {
+      "integrity": "sha512-NqADB8VjPFLM2V0VvHUewwwsw0ZWBaIdgo+ieHtK3hasLz4qeCRjYcqfB6AQrBggRKppKF8L52/VqdVsO47Dlw==",
+      "dependencies": [
+        "has-symbols"
+      ]
+    },
+    "hasown@2.0.2": {
+      "integrity": "sha512-0hJU9SCPvmMzIBdZFqNPXWa6dqh7WdH0cII9y+CyS8rG3nL48Bclra9HmKhVVUHyPWNH5Y7xDwAB7bfgSjkUMQ==",
+      "dependencies": [
+        "function-bind"
+      ]
+    },
    "hookable@5.5.3": {
      "integrity": "sha512-Yc+BQe8SvoXH1643Qez1zqLRmbA5rCL+sSmk6TVos0LWVfNIB7PGncdlId77WzLGSIB5KaWgTaNTs2lNVEI6VQ=="
    },
+    "http-proxy-agent@7.0.2": {
+      "integrity": "sha512-T1gkAiYYDWYx3V5Bmyu7HcfcvL7mUrTWiM6yOfa3PIphViJ/gFPbvidQ+veqSOHci/PxBcDabeUNCzpOODJZig==",
+      "dependencies": [
+        "agent-base",
+        "debug"
+      ]
+    },
+    "https-proxy-agent@7.0.6": {
+      "integrity": "sha512-vK9P5/iUfdl95AI+JVyUuIcVtd4ofvtrOr3HNtM2yxC9bnMbEdp3x01OhQNnjb8IJYi38VlTE3mBXwcfvywuSw==",
+      "dependencies": [
+        "agent-base",
+        "debug"
+      ]
+    },
    "jiti@2.4.2": {
      "integrity": "sha512-rg9zJN+G4n2nfJl5MW3BMygZX56zKPNVEYYqq7adpmMh4Jn2QNEwhvQlFy6jPVdcod7txZtKHWnyZiA3a0zP7A==",
      "bin": true
@@ -496,9 +834,33 @@
        "@jridgewell/sourcemap-codec"
      ]
    },
+    "math-intrinsics@1.1.0": {
+      "integrity": "sha512-/IXtbwEk5HTPyEwyKX6hGkYXxM9nbj64B+ilVJnC/R6B0pH5G4V3b0pVbL7DBj4tkhBAppbQUlf6F6Xl9LHu1g=="
+    },
+    "mime-db@1.52.0": {
+      "integrity": "sha512-sPU4uV7dYlvtWJxwwxHD0PuihVNiE7TyAbQ5SWxDCB9mUYvOgroQOwYQQOKPJ8CIbE+1ETVlOoK1UC2nU3gYvg=="
+    },
+    "mime-types@2.1.35": {
+      "integrity": "sha512-ZDY+bPm5zTTF+YpCrAU9nK0UgICYPT0QtT1NZWFv4s++TNkcgVaT0g6+4R2uI4MjQjzysHB1zxuWL50hzaeXiw==",
+      "dependencies": [
+        "mime-db"
+      ]
+    },
+    "minimatch@3.1.2": {
+      "integrity": "sha512-J7p63hRiAjw1NDEww1W7i37+ByIrOWO5XQQAzZ3VOcL0PNybwpfmV/N05zFAzwQ9USyEcX6t3UO+K5aqBQOIHw==",
+      "dependencies": [
+        "brace-expansion"
+      ]
+    },
    "ms@2.1.3": {
      "integrity": "sha512-6FlzubTLZG3J2a/NVCAleEhjzq5oxgHyaCU9yYXvcLsvoVaHJq/s5xXI6/XXP6tz7R9xAOtHnSO/tXtF3WRTlA=="
    },
+    "node-fetch@2.7.0": {
+      "integrity": "sha512-c4FRfUm/dbcWZ7U+1Wq0AwCyFL+3nt2bEw05wfxSz+DWpWsitgmSgYmy2dQdWyKC1694ELPqMs/YzUSNozLt8A==",
+      "dependencies": [
+        "whatwg-url"
+      ]
+    },
    "oxc-resolver@9.0.2": {
      "integrity": "sha512-w838ygc1p7rF+7+h5vR9A+Y9Fc4imy6C3xPthCMkdFUgFvUWkmABeNB8RBDQ6+afk44Q60/UMMQ+gfDUW99fBA==",
      "optionalDependencies": [
@@ -585,6 +947,12 @@
      ],
      "bin": true
    },
+    "safe-buffer@5.2.1": {
+      "integrity": "sha512-rp3So07KcdmmKbGvgaNxQSJr7bGVSVk5S9Eq1F+ppbRo70+YeaDxkw5Dd8NPN+GD6bjnYm2VuPuCXmpuYvmCXQ=="
+    },
+    "sax@1.4.1": {
+      "integrity": "sha512-+aWOz7yVScEGoKNd4PA10LZ8sk0A/z5+nXQG5giUO5rprX9jgYsTdov9qCchZiPIZezbZH+jRut8nPodFAX4Jg=="
+    },
    "semver@6.3.1": {
      "integrity": "sha512-BR7VvDCVHO+q2xBEWskxS6DJE1qRnb7DxzUrogb71CWoSficBxYsiAGd+Kl0mmq/MprG9yArRkyrQxTO6XjMzA==",
      "bin": true
@@ -593,6 +961,9 @@
      "integrity": "sha512-hlq8tAfn0m/61p4BVRcPzIGr6LKiMwo4VM6dGi6pt4qcRkmNzTcWq6eCEjEh+qXjkMDvPlOFFSGwQjoEa6gyMA==",
      "bin": true
    },
+    "strnum@2.1.0": {
+      "integrity": "sha512-w0S//9BqZZGw0L0Y8uLSelFGnDJgTyyNQLmSlPnVz43zPAiqu3w4t8J8sDqqANOGeZIZ/9jWuPguYcEnsoHv4A=="
+    },
    "tinyexec@1.0.1": {
      "integrity": "sha512-5uC6DDlmeqiOwCPmK9jMSdOuZTh8bU39Ys6yidB+UTt5hfZUPGAypSgFRiEp+jbi9qH40BLDvy85jIU88wKSqw=="
    },
@@ -603,6 +974,9 @@
        "picomatch"
      ]
    },
+    "tr46@0.0.3": {
+      "integrity": "sha512-N3WMsuqV66lT30CrXNbEjx4GEwlow3v6rr4mCcv6prnfwhS01rkgyFdjPNBYd9br7LpXV1+Emh01fHnq2Gdgrw=="
+    },
    "tsdown@0.10.1_rolldown@1.0.0-beta.8-commit.852c603__valibot@1.0.0": {
      "integrity": "sha512-NT1XSUDweBpgpiZb3Upfy3DBwAbn8W0aXo3Ecp4kHozTLewWa0UkWUP6nRTvSj2c0NcD/BLLuf0HthqMpbEdkA==",
      "dependencies": [
@@ -624,12 +998,19 @@
      ],
      "bin": true
    },
+    "tslib@1.14.1": {
+      "integrity": "sha512-Xni35NKzjgMrwevysHTCArtLDpPvye8zV/0E4EyYn43P7/7qvQwPh9BGkHewbMulVntbigmcT7rdX3BNo9wRJg=="
+    },
    "tslib@2.8.1": {
      "integrity": "sha512-oJFu94HQb+KVduSUQL7wnpmqnfmLsOA/nAh6b6EH0wCEoK0/mPeXU6c3wKDV83MkOuHPRHtSXKKU99IBazS/2w=="
    },
    "tunnel@0.0.6": {
      "integrity": "sha512-1h/Lnq9yajKY2PEbBadPXj3VxsDDu844OnaAo52UVmIzIvwwtBPIuNvkjuzBlTWpfJyUbG3ez0KSBibQkj4ojg=="
    },
+    "typescript@3.9.10": {
+      "integrity": "sha512-w6fIxVE/H1PkLKcCPsFqKE7Kv7QUwhU8qQY2MueZXWx5cPZdwFupLgKK3vntcK98BtNHZtAF4LA/yl2a7k8R6Q==",
+      "bin": true
+    },
    "unconfig@7.3.2": {
      "integrity": "sha512-nqG5NNL2wFVGZ0NA/aCFw0oJ2pxSf1lwg4Z5ill8wd7K4KX/rQbHlwbh+bjctXL5Ly1xtzHenHGOK0b+lG6JVg==",
      "dependencies": [
@@ -667,15 +1048,40 @@
        "webpack-virtual-modules"
      ]
    },
+    "uuid@8.3.2": {
+      "integrity": "sha512-+NYs2QeMWy+GWFOEm9xnn6HCDp0l7QBD7ml8zLUmJ+93Q5NF0NocErnwkTkXVFNiX3/fpC6afS8Dhb/gz7R7eg==",
+      "bin": true
+    },
    "valibot@1.0.0": {
      "integrity": "sha512-1Hc0ihzWxBar6NGeZv7fPLY0QuxFMyxwYR2sF1Blu7Wq7EnremwY2W02tit2ij2VJT8HcSkHAQqmFfl77f73Yw=="
    },
+    "webidl-conversions@3.0.1": {
+      "integrity": "sha512-2JAn3z8AR6rjK8Sm8orRC0h/bcl/DqL7tRPdGZ4I1CjdF+EaMLmYxBHyXuKL849eucPFhvBoxMsflfOb8kxaeQ=="
+    },
    "webpack-virtual-modules@0.6.2": {
      "integrity": "sha512-66/V2i5hQanC51vBQKPH4aI8NMAcBW59FVBs+rC7eGHupMyfn34q7rZIE+ETlJ+XTevqfUhVVBgSUNSW2flEUQ=="
+    },
+    "whatwg-url@5.0.0": {
+      "integrity": "sha512-saE57nupxk6v3HY35+jzBwYa0rKSy0XR8JSxZPwgLr7ys0IBzhGviA1/TUGJLmSVqs8pb9AnvICXEuOHLprYTw==",
+      "dependencies": [
+        "tr46",
+        "webidl-conversions"
+      ]
+    },
+    "xml2js@0.5.0": {
+      "integrity": "sha512-drPFnkQJik/O+uPKpqSgr22mpuFHqKdbS835iAQrUC73L2F5WkboIRd63ai/2Yg6I1jzifPFKH2NTK+cfglkIA==",
+      "dependencies": [
+        "sax",
+        "xmlbuilder"
+      ]
+    },
+    "xmlbuilder@11.0.1": {
+      "integrity": "sha512-fDlsI/kFEx7gLvbecc0/ohLG50fugQp8ryHzMTuW9vSa1GJ0XYWKnhsUx7oie3G98+r56aTQIUB4kht42R3JvA=="
    }
  },
  "workspace": {
    "dependencies": [
+      "npm:@actions/cache@^4.0.3",
      "npm:@actions/core@^1.11.1",
      "npm:@actions/tool-cache@^2.0.2",
      "npm:@types/node@^22.15.0",
--- a/dist/cache-ByPW8-iO.mjs
+++ b/dist/cache-ByPW8-iO.mjs
@@ -0,0 +1,4 @@
+import "./semver-DmxAwBYV.mjs";
+import { restoreCache, saveCache } from "./cache-DzONlZ-I.mjs";
+
+export { restoreCache };
--- a/dist/cache-DzONlZ-I.mjs
+++ b/dist/cache-DzONlZ-I.mjs
--- a/dist/main.mjs
+++ b/dist/main.mjs
--- a/dist/post.mjs
+++ b/dist/post.mjs
@@ -0,0 +1,16 @@
+import { import_core } from "./semver-DmxAwBYV.mjs";
+import { saveCache } from "./cache-DzONlZ-I.mjs";
+import process from "node:process";
+
+//#region src/post.ts
+async function main() {
+	try {
+		await saveCache();
+	} catch (err) {
+		import_core.setFailed(err instanceof Error ? err : String(err));
+		process.exit();
+	}
+}
+main();
+
+//#endregion
--- a/dist/semver-DmxAwBYV.mjs
+++ b/dist/semver-DmxAwBYV.mjs
--- a/scripts/build.ts
+++ b/scripts/build.ts
@@ -9,9 +9,16 @@ await new Deno.Command(Deno.execPath(), {
  stderr: "inherit",
 }).output();

+try {
+  Deno.removeSync(join(import.meta.dirname!, "../dist"), { recursive: true });
+} catch {
+  // ignore
+}
+
 await build({
  entry: {
    main: "src/main.ts",
+    post: "src/post.ts",
  },
  target: "node20.19",
  platform: "node",
--- a/src/cache.ts
+++ b/src/cache.ts
@@ -0,0 +1,81 @@
+import process from "node:process";
+import cache from "@actions/cache";
+import core from "@actions/core";
+
+const state = {
+  DENO_DIR: "DENO_DIR",
+  CACHE_HIT: "CACHE_HIT",
+  CACHE_SAVE: "CACHE_SAVE",
+} as const;
+
+export async function saveCache() {
+  if (!cache.isFeatureAvailable()) {
+    core.warning("Caching is not available. Caching is skipped.");
+    return;
+  }
+
+  const denoDir = core.getState(state.DENO_DIR);
+  const saveKey = core.getState(state.CACHE_SAVE);
+  if (!denoDir || !saveKey) {
+    core.info("Caching is not enabled. Caching is skipped.");
+    return;
+  } else if (core.getState(state.CACHE_HIT) === "true") {
+    core.info(
+      `Cache hit occurred on the primary key "${saveKey}", not saving cache.`,
+    );
+    return;
+  }
+
+  await cache.saveCache([denoDir], saveKey);
+  core.info(`Cache saved with key: "${saveKey}".`);
+}
+
+export async function restoreCache(cacheHash: string) {
+  try {
+    const denoDir = await resolveDenoDir();
+    core.saveState(state.DENO_DIR, denoDir);
+
+    const { GITHUB_JOB, RUNNER_OS, RUNNER_ARCH } = process.env;
+    const restoreKey = `deno-cache-${RUNNER_OS}-${RUNNER_ARCH}`;
+    // CI jobs often download different dependencies, so include Job ID in the cache key.
+    const primaryKey = `${restoreKey}-${GITHUB_JOB}-${cacheHash}`;
+    core.saveState(state.CACHE_SAVE, primaryKey);
+
+    const loadedCacheKey = await cache.restoreCache([denoDir], primaryKey, [
+      restoreKey,
+    ]);
+    const cacheHit = primaryKey === loadedCacheKey;
+    core.setOutput("cache-hit", cacheHit);
+    core.saveState(state.CACHE_HIT, cacheHit);
+
+    const message = loadedCacheKey
+      ? `Cache key used: "${loadedCacheKey}".`
+      : `No cache found for restore key: "${restoreKey}".`;
+    core.info(message);
+  } catch (err) {
+    core.warning(
+      new Error("Failed to restore cache. Continuing without cache.", {
+        cause: err,
+      }),
+    );
+  }
+}
+
+async function resolveDenoDir(): Promise<string> {
+  const { DENO_DIR } = process.env;
+  if (DENO_DIR) return DENO_DIR;
+
+  // Retrieve the DENO_DIR from `deno info --json`
+  const { exec } = await import("node:child_process");
+  const output = await new Promise<string>((res, rej) => {
+    exec("deno info --json", (err, stdout) => err ? rej(err) : res(stdout));
+  });
+  const info = JSON.parse(output);
+  if (typeof info.denoDir !== "string") {
+    throw new Error(
+      "`deno info --json` output did not contain a denoDir property. " +
+        "Maybe try updating this action or your Deno version if either are old.",
+    );
+  }
+  return info.denoDir;
+}
--- a/src/main.ts
+++ b/src/main.ts
@@ -56,6 +56,11 @@ async function main() {
    core.setOutput("release-channel", version.kind);

    core.info("Installation complete.");
+
+    if (core.getInput("cache") === "true") {
+      const { restoreCache } = await import("./cache.ts");
+      await restoreCache(core.getInput("cache-hash"));
+    }
  } catch (err) {
    core.setFailed((err instanceof Error) ? err : String(err));
    process.exit();
--- a/src/post.ts
+++ b/src/post.ts
@@ -0,0 +1,14 @@
+import process from "node:process";
+import core from "@actions/core";
+import { saveCache } from "./cache.ts";
+
+async function main() {
+  try {
+    await saveCache();
+  } catch (err) {
+    core.setFailed((err instanceof Error) ? err : String(err));
+    process.exit();
+  }
+}
+
+main();