diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index c605dfe..85a4e78 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -10,7 +10,7 @@ jobs:
     name: Build
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Install Nix
         uses: DeterminateSystems/nix-installer-action@main
       - uses: DeterminateSystems/magic-nix-cache-action@main
@@ -31,6 +31,19 @@ jobs:
       - run: git status --porcelain=v1
       - run: test $(git status --porcelain=v1 2>/dev/null | wc -l) -eq 0
 
+  test-no-nix:
+    name: "Test: Nix not installed"
+    runs-on: ubuntu-22.04
+    permissions:
+      id-token: "write"
+      contents: "read"
+    env:
+      ACTIONS_STEP_DEBUG: true
+    steps:
+      - uses: actions/checkout@v4
+      - name: Cache the store
+        uses: ./
+
   run-x86_64-linux:
     name: Run x86_64 Linux
     runs-on: ubuntu-22.04
@@ -40,7 +53,7 @@ jobs:
     env:
       ACTIONS_STEP_DEBUG: true
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Install Nix
         uses: DeterminateSystems/nix-installer-action@main
         with:
@@ -62,7 +75,7 @@ jobs:
     env:
       ACTIONS_STEP_DEBUG: true
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Install Nix
         uses: DeterminateSystems/nix-installer-action@main
         with:
@@ -85,7 +98,7 @@ jobs:
     env:
       ACTIONS_STEP_DEBUG: true
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Install Nix
         uses: DeterminateSystems/nix-installer-action@main
         with:
diff --git a/.github/workflows/flakehub-cache.yml b/.github/workflows/flakehub-cache.yml
index c7969de..e88ad9c 100644
--- a/.github/workflows/flakehub-cache.yml
+++ b/.github/workflows/flakehub-cache.yml
@@ -22,7 +22,7 @@ jobs:
           - nix-system: "x86_64-linux"
             runner: "ubuntu-22.04"
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: DeterminateSystems/nix-installer-action@main
       - uses: DeterminateSystems/magic-nix-cache-action@main
         with:
diff --git a/README.md b/README.md
index ac09c34..d3c5404 100644
--- a/README.md
+++ b/README.md
@@ -45,7 +45,7 @@ jobs:
       id-token: "write"
       contents: "read"
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: DeterminateSystems/nix-installer-action@main
       - uses: DeterminateSystems/magic-nix-cache-action@main
       - uses: DeterminateSystems/flake-checker-action@main
diff --git a/dist/index.js b/dist/index.js
index 606ac87..202dd0b 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -94412,9 +94412,10 @@ const got = source_create(defaults);
 
 
 
-;// CONCATENATED MODULE: ./node_modules/.pnpm/github.com+DeterminateSystems+detsys-ts@3a315cdffd83d4b229d4fb16548d22a3756baf28_lprtsns3vmnabnzqpk64lag6gi/node_modules/detsys-ts/dist/correlation.js
+;// CONCATENATED MODULE: ./node_modules/.pnpm/github.com+DeterminateSystems+detsys-ts@1b12595783709c71515245d26437934a9f336598_b6j756lg3cqeptkcpq5wzeu4sa/node_modules/detsys-ts/dist/correlation.js
 
 
+const OPTIONAL_VARIABLES = ["INVOCATION_ID"];
 function identify(projectName) {
     const ident = {
         correlation_source: "github-actions",
@@ -94463,6 +94464,7 @@ function identify(projectName) {
             "GITHUB_RUN_ID",
             "GITHUB_RUN_NUMBER",
             "GITHUB_RUN_ATTEMPT",
+            "INVOCATION_ID",
         ]),
         groups: {
             ci: "github-actions",
@@ -94481,23 +94483,34 @@ function identify(projectName) {
 function hashEnvironmentVariables(prefix, variables) {
     const hash = (0,external_node_crypto_namespaceObject.createHash)("sha256");
     for (const varName of variables) {
-        const value = process.env[varName];
+        let value = process.env[varName];
         if (value === undefined) {
-            core.debug(`Environment variable not set: ${varName} -- can't generate the requested identity`);
-            return undefined;
-        }
-        else {
-            hash.update(value);
-            hash.update("\0");
+            if (OPTIONAL_VARIABLES.includes(varName)) {
+                core.debug(`Optional environment variable not set: ${varName} -- substituting with the variable name`);
+                value = varName;
+            }
+            else {
+                core.debug(`Environment variable not set: ${varName} -- can't generate the requested identity`);
+                return undefined;
+            }
         }
+        hash.update(value);
+        hash.update("\0");
     }
     return `${prefix}-${hash.digest("hex")}`;
 }
 
-;// CONCATENATED MODULE: ./node_modules/.pnpm/github.com+DeterminateSystems+detsys-ts@3a315cdffd83d4b229d4fb16548d22a3756baf28_lprtsns3vmnabnzqpk64lag6gi/node_modules/detsys-ts/dist/package.json
+;// CONCATENATED MODULE: ./node_modules/.pnpm/github.com+DeterminateSystems+detsys-ts@1b12595783709c71515245d26437934a9f336598_b6j756lg3cqeptkcpq5wzeu4sa/node_modules/detsys-ts/dist/package.json
 const package_namespaceObject = {"i8":"1.0.0"};
-;// CONCATENATED MODULE: ./node_modules/.pnpm/github.com+DeterminateSystems+detsys-ts@3a315cdffd83d4b229d4fb16548d22a3756baf28_lprtsns3vmnabnzqpk64lag6gi/node_modules/detsys-ts/dist/platform.js
+;// CONCATENATED MODULE: ./node_modules/.pnpm/github.com+DeterminateSystems+detsys-ts@1b12595783709c71515245d26437934a9f336598_b6j756lg3cqeptkcpq5wzeu4sa/node_modules/detsys-ts/dist/platform.js
+/**
+ * @packageDocumentation
+ * Helpers for determining system attributes of the current runner.
+ */
 
+/**
+ * Get the current architecture plus OS. Examples include `X64-Linux` and `ARM64-macOS`.
+ */
 function getArchOs() {
     const envArch = process.env.RUNNER_ARCH;
     const envOs = process.env.RUNNER_OS;
@@ -94509,6 +94522,9 @@ function getArchOs() {
         throw new Error("RUNNER_ARCH and/or RUNNER_OS is not defined");
     }
 }
+/**
+ * Get the current Nix system. Examples include `x86_64-linux` and `aarch64-darwin`.
+ */
 function getNixPlatform(archOs) {
     const archOsMap = new Map([
         ["X64-macOS", "x86_64-darwin"],
@@ -94526,17 +94542,86 @@ function getNixPlatform(archOs) {
     }
 }
 
-;// CONCATENATED MODULE: ./node_modules/.pnpm/github.com+DeterminateSystems+detsys-ts@3a315cdffd83d4b229d4fb16548d22a3756baf28_lprtsns3vmnabnzqpk64lag6gi/node_modules/detsys-ts/dist/sourcedef.js
+;// CONCATENATED MODULE: ./node_modules/.pnpm/github.com+DeterminateSystems+detsys-ts@1b12595783709c71515245d26437934a9f336598_b6j756lg3cqeptkcpq5wzeu4sa/node_modules/detsys-ts/dist/inputs.js
+/**
+ * @packageDocumentation
+ * Helpers for getting values from an Action's configuration.
+ */
+
+/**
+ * Get a Boolean input from the Action's configuration by name.
+ */
+const getBool = (name) => {
+    return actionsCore.getBooleanInput(name);
+};
+/**
+ * Get a multi-line string input from the Action's configuration by name or return `null` if not set.
+ */
+const getMultilineStringOrNull = (name) => {
+    const value = actionsCore.getMultilineInput(name);
+    if (value.length === 0) {
+        return null;
+    }
+    else {
+        return value;
+    }
+};
+/**
+ * Get a number input from the Action's configuration by name or return `null` if not set.
+ */
+const getNumberOrNull = (name) => {
+    const value = actionsCore.getInput(name);
+    if (value === "") {
+        return null;
+    }
+    else {
+        return Number(value);
+    }
+};
+/**
+ * Get a string input from the Action's configuration.
+ */
+const getString = (name) => {
+    return actionsCore.getInput(name);
+};
+/**
+ * Get a string input from the Action's configuration by name or return `null` if not set.
+ */
+const getStringOrNull = (name) => {
+    const value = actionsCore.getInput(name);
+    if (value === "") {
+        return null;
+    }
+    else {
+        return value;
+    }
+};
+/**
+ * Get a string input from the Action's configuration by name or return `undefined` if not set.
+ */
+const getStringOrUndefined = (name) => {
+    const value = core.getInput(name);
+    if (value === "") {
+        return undefined;
+    }
+    else {
+        return value;
+    }
+};
+
+
+;// CONCATENATED MODULE: ./node_modules/.pnpm/github.com+DeterminateSystems+detsys-ts@1b12595783709c71515245d26437934a9f336598_b6j756lg3cqeptkcpq5wzeu4sa/node_modules/detsys-ts/dist/sourcedef.js
+
 
 function constructSourceParameters(legacyPrefix) {
     const noisilyGetInput = (suffix) => {
-        const preferredInput = inputStringOrUndef(`source-${suffix}`);
+        const preferredInput = getStringOrUndefined(`source-${suffix}`);
         if (!legacyPrefix) {
             return preferredInput;
         }
         // Remaining is for handling cases where the legacy prefix
         // should be examined.
-        const legacyInput = inputStringOrUndef(`${legacyPrefix}-${suffix}`);
+        const legacyInput = getStringOrUndefined(`${legacyPrefix}-${suffix}`);
         if (preferredInput && legacyInput) {
             core.warning(`The supported option source-${suffix} and the legacy option ${legacyPrefix}-${suffix} are both set. Preferring source-${suffix}. Please stop setting ${legacyPrefix}-${suffix}.`);
             return preferredInput;
@@ -94558,15 +94643,6 @@ function constructSourceParameters(legacyPrefix) {
         revision: noisilyGetInput("revision"),
     };
 }
-function inputStringOrUndef(name) {
-    const value = core.getInput(name);
-    if (value === "") {
-        return undefined;
-    }
-    else {
-        return value;
-    }
-}
 
 // EXTERNAL MODULE: ./node_modules/.pnpm/@actions+cache@3.2.4/node_modules/@actions/cache/lib/cache.js
 var cache = __nccwpck_require__(6878);
@@ -94586,7 +94662,11 @@ const validate = uuid_dist/* validate */.Gu;
 const stringify = uuid_dist/* stringify */.Pz;
 const parse = uuid_dist/* parse */.Qc;
 
-;// CONCATENATED MODULE: ./node_modules/.pnpm/github.com+DeterminateSystems+detsys-ts@3a315cdffd83d4b229d4fb16548d22a3756baf28_lprtsns3vmnabnzqpk64lag6gi/node_modules/detsys-ts/dist/main.js
+;// CONCATENATED MODULE: ./node_modules/.pnpm/github.com+DeterminateSystems+detsys-ts@1b12595783709c71515245d26437934a9f336598_b6j756lg3cqeptkcpq5wzeu4sa/node_modules/detsys-ts/dist/main.js
+/**
+ * @packageDocumentation
+ * Determinate Systems' TypeScript library for creating GitHub Actions logic.
+ */
 
 // eslint-disable-next-line import/extensions
 
@@ -94695,6 +94775,10 @@ class IdsToolbox {
     async executeAsync() {
         try {
             process.env.DETSYS_CORRELATION = JSON.stringify(this.getCorrelationHashes());
+            if (!(await this.preflightRequireNix())) {
+                this.recordEvent("preflight-require-nix-denied");
+                return;
+            }
             if (this.executionPhase === "main" && this.hookMain) {
                 await this.hookMain();
             }
@@ -94858,6 +94942,45 @@ class IdsToolbox {
             process.chdir(startCwd);
         }
     }
+    async preflightRequireNix() {
+        let nixLocation;
+        const pathParts = (process.env["PATH"] || "").split(":");
+        for (const location of pathParts) {
+            const candidateNix = external_node_path_namespaceObject.join(location, "nix");
+            try {
+                await promises_namespaceObject.access(candidateNix, promises_namespaceObject.constants.X_OK);
+                core.debug(`Found Nix at ${candidateNix}`);
+                nixLocation = candidateNix;
+            }
+            catch {
+                core.debug(`Nix not at ${candidateNix}`);
+            }
+        }
+        this.addFact("nix_location", nixLocation || "");
+        if (this.actionOptions.requireNix === "ignore") {
+            return true;
+        }
+        const currentNotFoundState = core.getState("idstoolbox_nix_not_found");
+        if (currentNotFoundState === "not-found") {
+            // It was previously not found, so don't run subsequent actions
+            return false;
+        }
+        if (nixLocation !== undefined) {
+            return true;
+        }
+        core.saveState("idstoolbox_nix_not_found", "not-found");
+        switch (this.actionOptions.requireNix) {
+            case "fail":
+                core.setFailed("This action can only be used when Nix is installed." +
+                    " Add `- uses: DeterminateSystems/nix-installer-action@main` earlier in your workflow.");
+                break;
+            case "warn":
+                core.warning("This action is in no-op mode because Nix is not installed." +
+                    " Add `- uses: DeterminateSystems/nix-installer-action@main` earlier in your workflow.");
+                break;
+        }
+        return false;
+    }
     async submitEvents() {
         if (!this.actionOptions.diagnosticsUrl) {
             core.debug("Diagnostics are disabled. Not sending the following events:");
@@ -94892,6 +95015,7 @@ function makeOptionsConfident(actionOptions) {
         eventPrefix: actionOptions.eventPrefix || "action:",
         fetchStyle: actionOptions.fetchStyle,
         legacySourcePrefix: actionOptions.legacySourcePrefix,
+        requireNix: actionOptions.requireNix,
         diagnosticsUrl: determineDiagnosticsUrl(idsProjectName, actionOptions.diagnosticsUrl),
     };
     core.debug("idslib options:");
@@ -94957,6 +95081,9 @@ function mungeDiagnosticEndpoint(inputUrl) {
     }
     return inputUrl;
 }
+// Public exports from other files
+
+
 
 ;// CONCATENATED MODULE: ./dist/index.js
 
@@ -95220,6 +95347,7 @@ const idslib = new IdsToolbox({
     name: "magic-nix-cache",
     fetchStyle: "gh-env-style",
     idsProjectName: "magic-nix-cache-closure",
+    requireNix: "warn",
 });
 idslib.onMain(async () => {
     await setUpAutoCache(idslib);
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index de94bcd..89a9ef1 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -19,7 +19,7 @@ dependencies:
     version: 2.0.1
   detsys-ts:
     specifier: github:DeterminateSystems/detsys-ts
-    version: github.com/DeterminateSystems/detsys-ts/3a315cdffd83d4b229d4fb16548d22a3756baf28
+    version: github.com/DeterminateSystems/detsys-ts/1b12595783709c71515245d26437934a9f336598
   fetch-retry:
     specifier: ^5.0.6
     version: 5.0.6
@@ -48,7 +48,7 @@ devDependencies:
     version: 9.0.8
   "@typescript-eslint/eslint-plugin":
     specifier: ^7.6.0
-    version: 7.6.0(@typescript-eslint/parser@7.6.0)(eslint@8.57.0)(typescript@5.4.5)
+    version: 7.6.0(@typescript-eslint/parser@7.7.0)(eslint@8.57.0)(typescript@5.4.5)
   "@vercel/ncc":
     specifier: ^0.38.1
     version: 0.38.1
@@ -57,13 +57,13 @@ devDependencies:
     version: 8.57.0
   eslint-import-resolver-typescript:
     specifier: ^3.6.1
-    version: 3.6.1(@typescript-eslint/parser@7.6.0)(eslint-plugin-import@2.29.1)(eslint@8.57.0)
+    version: 3.6.1(@typescript-eslint/parser@7.7.0)(eslint-plugin-import@2.29.1)(eslint@8.57.0)
   eslint-plugin-github:
     specifier: ^4.10.2
     version: 4.10.2(eslint-import-resolver-typescript@3.6.1)(eslint@8.57.0)(typescript@5.4.5)
   eslint-plugin-import:
     specifier: ^2.29.1
-    version: 2.29.1(@typescript-eslint/parser@7.6.0)(eslint-import-resolver-typescript@3.6.1)(eslint@8.57.0)
+    version: 2.29.1(@typescript-eslint/parser@7.7.0)(eslint-import-resolver-typescript@3.6.1)(eslint@8.57.0)
   eslint-plugin-prettier:
     specifier: ^5.1.3
     version: 5.1.3(eslint-config-prettier@9.1.0)(eslint@8.57.0)(prettier@3.2.5)
@@ -951,6 +951,38 @@ packages:
       - supports-color
     dev: true
 
+  /@typescript-eslint/eslint-plugin@7.6.0(@typescript-eslint/parser@7.7.0)(eslint@8.57.0)(typescript@5.4.5):
+    resolution:
+      {
+        integrity: sha512-gKmTNwZnblUdnTIJu3e9kmeRRzV2j1a/LUO27KNNAnIC5zjy1aSvXSRp4rVNlmAoHlQ7HzX42NbKpcSr4jF80A==,
+      }
+    engines: { node: ^18.18.0 || >=20.0.0 }
+    peerDependencies:
+      "@typescript-eslint/parser": ^7.0.0
+      eslint: ^8.56.0
+      typescript: "*"
+    peerDependenciesMeta:
+      typescript:
+        optional: true
+    dependencies:
+      "@eslint-community/regexpp": 4.10.0
+      "@typescript-eslint/parser": 7.7.0(eslint@8.57.0)(typescript@5.4.5)
+      "@typescript-eslint/scope-manager": 7.6.0
+      "@typescript-eslint/type-utils": 7.6.0(eslint@8.57.0)(typescript@5.4.5)
+      "@typescript-eslint/utils": 7.6.0(eslint@8.57.0)(typescript@5.4.5)
+      "@typescript-eslint/visitor-keys": 7.6.0
+      debug: 4.3.4
+      eslint: 8.57.0
+      graphemer: 1.4.0
+      ignore: 5.3.1
+      natural-compare: 1.4.0
+      semver: 7.6.0
+      ts-api-utils: 1.3.0(typescript@5.4.5)
+      typescript: 5.4.5
+    transitivePeerDependencies:
+      - supports-color
+    dev: true
+
   /@typescript-eslint/parser@7.6.0(eslint@8.57.0)(typescript@5.4.5):
     resolution:
       {
@@ -975,6 +1007,30 @@ packages:
       - supports-color
     dev: true
 
+  /@typescript-eslint/parser@7.7.0(eslint@8.57.0)(typescript@5.4.5):
+    resolution:
+      {
+        integrity: sha512-fNcDm3wSwVM8QYL4HKVBggdIPAy9Q41vcvC/GtDobw3c4ndVT3K6cqudUmjHPw8EAp4ufax0o58/xvWaP2FmTg==,
+      }
+    engines: { node: ^18.18.0 || >=20.0.0 }
+    peerDependencies:
+      eslint: ^8.56.0
+      typescript: "*"
+    peerDependenciesMeta:
+      typescript:
+        optional: true
+    dependencies:
+      "@typescript-eslint/scope-manager": 7.7.0
+      "@typescript-eslint/types": 7.7.0
+      "@typescript-eslint/typescript-estree": 7.7.0(typescript@5.4.5)
+      "@typescript-eslint/visitor-keys": 7.7.0
+      debug: 4.3.4
+      eslint: 8.57.0
+      typescript: 5.4.5
+    transitivePeerDependencies:
+      - supports-color
+    dev: true
+
   /@typescript-eslint/scope-manager@7.6.0:
     resolution:
       {
@@ -986,6 +1042,17 @@ packages:
       "@typescript-eslint/visitor-keys": 7.6.0
     dev: true
 
+  /@typescript-eslint/scope-manager@7.7.0:
+    resolution:
+      {
+        integrity: sha512-/8INDn0YLInbe9Wt7dK4cXLDYp0fNHP5xKLHvZl3mOT5X17rK/YShXaiNmorl+/U4VKCVIjJnx4Ri5b0y+HClw==,
+      }
+    engines: { node: ^18.18.0 || >=20.0.0 }
+    dependencies:
+      "@typescript-eslint/types": 7.7.0
+      "@typescript-eslint/visitor-keys": 7.7.0
+    dev: true
+
   /@typescript-eslint/type-utils@7.6.0(eslint@8.57.0)(typescript@5.4.5):
     resolution:
       {
@@ -1017,6 +1084,14 @@ packages:
     engines: { node: ^18.18.0 || >=20.0.0 }
     dev: true
 
+  /@typescript-eslint/types@7.7.0:
+    resolution:
+      {
+        integrity: sha512-G01YPZ1Bd2hn+KPpIbrAhEWOn5lQBrjxkzHkWvP6NucMXFtfXoevK82hzQdpfuQYuhkvFDeQYbzXCjR1z9Z03w==,
+      }
+    engines: { node: ^18.18.0 || >=20.0.0 }
+    dev: true
+
   /@typescript-eslint/typescript-estree@7.6.0(typescript@5.4.5):
     resolution:
       {
@@ -1042,6 +1117,31 @@ packages:
       - supports-color
     dev: true
 
+  /@typescript-eslint/typescript-estree@7.7.0(typescript@5.4.5):
+    resolution:
+      {
+        integrity: sha512-8p71HQPE6CbxIBy2kWHqM1KGrC07pk6RJn40n0DSc6bMOBBREZxSDJ+BmRzc8B5OdaMh1ty3mkuWRg4sCFiDQQ==,
+      }
+    engines: { node: ^18.18.0 || >=20.0.0 }
+    peerDependencies:
+      typescript: "*"
+    peerDependenciesMeta:
+      typescript:
+        optional: true
+    dependencies:
+      "@typescript-eslint/types": 7.7.0
+      "@typescript-eslint/visitor-keys": 7.7.0
+      debug: 4.3.4
+      globby: 11.1.0
+      is-glob: 4.0.3
+      minimatch: 9.0.4
+      semver: 7.6.0
+      ts-api-utils: 1.3.0(typescript@5.4.5)
+      typescript: 5.4.5
+    transitivePeerDependencies:
+      - supports-color
+    dev: true
+
   /@typescript-eslint/utils@7.6.0(eslint@8.57.0)(typescript@5.4.5):
     resolution:
       {
@@ -1075,6 +1175,17 @@ packages:
       eslint-visitor-keys: 3.4.3
     dev: true
 
+  /@typescript-eslint/visitor-keys@7.7.0:
+    resolution:
+      {
+        integrity: sha512-h0WHOj8MhdhY8YWkzIF30R379y0NqyOHExI9N9KCzvmu05EgG4FumeYa3ccfKUSphyWkWQE1ybVrgz/Pbam6YA==,
+      }
+    engines: { node: ^18.18.0 || >=20.0.0 }
+    dependencies:
+      "@typescript-eslint/types": 7.7.0
+      eslint-visitor-keys: 3.4.3
+    dev: true
+
   /@ungap/structured-clone@1.2.0:
     resolution:
       {
@@ -1888,7 +1999,7 @@ packages:
       - supports-color
     dev: true
 
-  /eslint-import-resolver-typescript@3.6.1(@typescript-eslint/parser@7.6.0)(eslint-plugin-import@2.29.1)(eslint@8.57.0):
+  /eslint-import-resolver-typescript@3.6.1(@typescript-eslint/parser@7.7.0)(eslint-plugin-import@2.29.1)(eslint@8.57.0):
     resolution:
       {
         integrity: sha512-xgdptdoi5W3niYeuQxKmzVDTATvLYqhpwmykwsh7f6HIOStGWEIL9iqZgQDF9u9OEzrRwR8no5q2VT+bjAujTg==,
@@ -1901,8 +2012,8 @@ packages:
       debug: 4.3.4
       enhanced-resolve: 5.16.0
       eslint: 8.57.0
-      eslint-module-utils: 2.8.1(@typescript-eslint/parser@7.6.0)(eslint-import-resolver-node@0.3.9)(eslint-import-resolver-typescript@3.6.1)(eslint@8.57.0)
-      eslint-plugin-import: 2.29.1(@typescript-eslint/parser@7.6.0)(eslint-import-resolver-typescript@3.6.1)(eslint@8.57.0)
+      eslint-module-utils: 2.8.1(@typescript-eslint/parser@7.7.0)(eslint-import-resolver-node@0.3.9)(eslint-import-resolver-typescript@3.6.1)(eslint@8.57.0)
+      eslint-plugin-import: 2.29.1(@typescript-eslint/parser@7.7.0)(eslint-import-resolver-typescript@3.6.1)(eslint@8.57.0)
       fast-glob: 3.3.2
       get-tsconfig: 4.7.3
       is-core-module: 2.13.1
@@ -1942,7 +2053,40 @@ packages:
       debug: 3.2.7
       eslint: 8.57.0
       eslint-import-resolver-node: 0.3.9
-      eslint-import-resolver-typescript: 3.6.1(@typescript-eslint/parser@7.6.0)(eslint-plugin-import@2.29.1)(eslint@8.57.0)
+      eslint-import-resolver-typescript: 3.6.1(@typescript-eslint/parser@7.7.0)(eslint-plugin-import@2.29.1)(eslint@8.57.0)
+    transitivePeerDependencies:
+      - supports-color
+    dev: true
+
+  /eslint-module-utils@2.8.1(@typescript-eslint/parser@7.7.0)(eslint-import-resolver-node@0.3.9)(eslint-import-resolver-typescript@3.6.1)(eslint@8.57.0):
+    resolution:
+      {
+        integrity: sha512-rXDXR3h7cs7dy9RNpUlQf80nX31XWJEyGq1tRMo+6GsO5VmTe4UTwtmonAD4ZkAsrfMVDA2wlGJ3790Ys+D49Q==,
+      }
+    engines: { node: ">=4" }
+    peerDependencies:
+      "@typescript-eslint/parser": "*"
+      eslint: "*"
+      eslint-import-resolver-node: "*"
+      eslint-import-resolver-typescript: "*"
+      eslint-import-resolver-webpack: "*"
+    peerDependenciesMeta:
+      "@typescript-eslint/parser":
+        optional: true
+      eslint:
+        optional: true
+      eslint-import-resolver-node:
+        optional: true
+      eslint-import-resolver-typescript:
+        optional: true
+      eslint-import-resolver-webpack:
+        optional: true
+    dependencies:
+      "@typescript-eslint/parser": 7.7.0(eslint@8.57.0)(typescript@5.4.5)
+      debug: 3.2.7
+      eslint: 8.57.0
+      eslint-import-resolver-node: 0.3.9
+      eslint-import-resolver-typescript: 3.6.1(@typescript-eslint/parser@7.7.0)(eslint-plugin-import@2.29.1)(eslint@8.57.0)
     transitivePeerDependencies:
       - supports-color
     dev: true
@@ -2072,6 +2216,44 @@ packages:
       - supports-color
     dev: true
 
+  /eslint-plugin-import@2.29.1(@typescript-eslint/parser@7.7.0)(eslint-import-resolver-typescript@3.6.1)(eslint@8.57.0):
+    resolution:
+      {
+        integrity: sha512-BbPC0cuExzhiMo4Ff1BTVwHpjjv28C5R+btTOGaCRC7UEz801up0JadwkeSk5Ued6TG34uaczuVuH6qyy5YUxw==,
+      }
+    engines: { node: ">=4" }
+    peerDependencies:
+      "@typescript-eslint/parser": "*"
+      eslint: ^2 || ^3 || ^4 || ^5 || ^6 || ^7.2.0 || ^8
+    peerDependenciesMeta:
+      "@typescript-eslint/parser":
+        optional: true
+    dependencies:
+      "@typescript-eslint/parser": 7.7.0(eslint@8.57.0)(typescript@5.4.5)
+      array-includes: 3.1.8
+      array.prototype.findlastindex: 1.2.5
+      array.prototype.flat: 1.3.2
+      array.prototype.flatmap: 1.3.2
+      debug: 3.2.7
+      doctrine: 2.1.0
+      eslint: 8.57.0
+      eslint-import-resolver-node: 0.3.9
+      eslint-module-utils: 2.8.1(@typescript-eslint/parser@7.7.0)(eslint-import-resolver-node@0.3.9)(eslint-import-resolver-typescript@3.6.1)(eslint@8.57.0)
+      hasown: 2.0.2
+      is-core-module: 2.13.1
+      is-glob: 4.0.3
+      minimatch: 3.1.2
+      object.fromentries: 2.0.8
+      object.groupby: 1.0.3
+      object.values: 1.2.0
+      semver: 6.3.1
+      tsconfig-paths: 3.15.0
+    transitivePeerDependencies:
+      - eslint-import-resolver-typescript
+      - eslint-import-resolver-webpack
+      - supports-color
+    dev: true
+
   /eslint-plugin-jsx-a11y@6.8.0(eslint@8.57.0):
     resolution:
       {
@@ -4353,10 +4535,10 @@ packages:
     engines: { node: ">=10" }
     dev: true
 
-  github.com/DeterminateSystems/detsys-ts/3a315cdffd83d4b229d4fb16548d22a3756baf28:
+  github.com/DeterminateSystems/detsys-ts/1b12595783709c71515245d26437934a9f336598:
     resolution:
       {
-        tarball: https://codeload.github.com/DeterminateSystems/detsys-ts/tar.gz/3a315cdffd83d4b229d4fb16548d22a3756baf28,
+        tarball: https://codeload.github.com/DeterminateSystems/detsys-ts/tar.gz/1b12595783709c71515245d26437934a9f336598,
       }
     name: detsys-ts
     version: 1.0.0
diff --git a/src/index.ts b/src/index.ts
index ac76998..169b441 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -305,6 +305,7 @@ const idslib = new IdsToolbox({
   name: "magic-nix-cache",
   fetchStyle: "gh-env-style",
   idsProjectName: "magic-nix-cache-closure",
+  requireNix: "warn",
 });
 
 idslib.onMain(async () => {