11 files changed, 663 insertions, 1073 deletions

diff --git a/package-lock.json b/package-lock.json
index 7bdb21d..29e12b3 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -8,9 +8,11 @@
       "name": "flatmatter",
       "version": "1.1.2",
       "license": "MIT",
+      "dependencies": {
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+      },
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         "@types/node": "^22.10.10",
-        "@vitest/coverage-istanbul": "^2.1.8",
         "@vitest/coverage-v8": "^2.1.8",
         "@vitest/ui": "^2.1.8",
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@@ -36,148 +38,6 @@
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-      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.26.2.tgz",
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-      "dev": true,
-      "license": "MIT",
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-        "js-tokens": "^4.0.0",
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-      "resolved": "https://registry.npmjs.org/@babel/compat-data/-/compat-data-7.26.5.tgz",
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-      "dev": true,
-      "license": "MIT",
-      "engines": {
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-    "node_modules/@babel/core": {
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-      "resolved": "https://registry.npmjs.org/@babel/core/-/core-7.26.7.tgz",
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-        "@babel/helper-module-transforms": "^7.26.0",
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-        "@babel/parser": "^7.26.7",
-        "@babel/template": "^7.25.9",
-        "@babel/traverse": "^7.26.7",
-        "@babel/types": "^7.26.7",
-        "convert-source-map": "^2.0.0",
-        "debug": "^4.1.0",
-        "gensync": "^1.0.0-beta.2",
-        "json5": "^2.2.3",
-        "semver": "^6.3.1"
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-      "engines": {
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-        "type": "opencollective",
-        "url": "https://opencollective.com/babel"
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-    "node_modules/@babel/core/node_modules/semver": {
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-      "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.1.tgz",
-      "integrity": "sha512-BR7VvDCVHO+q2xBEWskxS6DJE1qRnb7DxzUrogb71CWoSficBxYsiAGd+Kl0mmq/MprG9yArRkyrQxTO6XjMzA==",
-      "dev": true,
-      "license": "ISC",
-      "bin": {
-        "semver": "bin/semver.js"
-      }
-    },
-    "node_modules/@babel/generator": {
-      "version": "7.26.5",
-      "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.26.5.tgz",
-      "integrity": "sha512-2caSP6fN9I7HOe6nqhtft7V4g7/V/gfDsC3Ag4W7kEzzvRGKqiv0pu0HogPiZ3KaVSoNDhUws6IJjDjpfmYIXw==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
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-        "@babel/types": "^7.26.5",
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-        "@jridgewell/trace-mapping": "^0.3.25",
-        "jsesc": "^3.0.2"
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-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
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-        "@babel/helper-validator-option": "^7.25.9",
-        "browserslist": "^4.24.0",
-        "lru-cache": "^5.1.1",
-        "semver": "^6.3.1"
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-    "node_modules/@babel/helper-compilation-targets/node_modules/semver": {
-      "version": "6.3.1",
-      "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.1.tgz",
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-      "dev": true,
-      "license": "ISC",
-      "bin": {
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-    "node_modules/@babel/helper-module-imports": {
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-      "resolved": "https://registry.npmjs.org/@babel/helper-module-imports/-/helper-module-imports-7.25.9.tgz",
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-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
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-        "@babel/types": "^7.25.9"
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-      "engines": {
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-    "node_modules/@babel/helper-module-transforms": {
-      "version": "7.26.0",
-      "resolved": "https://registry.npmjs.org/@babel/helper-module-transforms/-/helper-module-transforms-7.26.0.tgz",
-      "integrity": "sha512-xO+xu6B5K2czEnQye6BHA7DolFFmS3LB7stHZFaOLb1pAwO1HWLS8fXA+eh0A2yIvltPVmx3eNNDBJA2SLHXFw==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "@babel/helper-module-imports": "^7.25.9",
-        "@babel/helper-validator-identifier": "^7.25.9",
-        "@babel/traverse": "^7.25.9"
-      },
-      "engines": {
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-      },
-      "peerDependencies": {
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     "node_modules/@babel/helper-string-parser": {
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@@ -198,38 +58,14 @@
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-    "node_modules/@babel/helper-validator-option": {
-      "version": "7.25.9",
-      "resolved": "https://registry.npmjs.org/@babel/helper-validator-option/-/helper-validator-option-7.25.9.tgz",
-      "integrity": "sha512-e/zv1co8pp55dNdEcCynfj9X7nyUKUXoUEwfXqaZt0omVOmDe9oOTdKStH4GmAw6zxMFs50ZayuMfHDKlO7Tfw==",
-      "dev": true,
-      "license": "MIT",
-      "engines": {
-        "node": ">=6.9.0"
-      }
-    },
-    "node_modules/@babel/helpers": {
-      "version": "7.26.7",
-      "resolved": "https://registry.npmjs.org/@babel/helpers/-/helpers-7.26.7.tgz",
-      "integrity": "sha512-8NHiL98vsi0mbPQmYAGWwfcFaOy4j2HY49fXJCfuDcdE7fMIsH9a7GdaeXpIBsbT7307WU8KCMp5pUVDNL4f9A==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "@babel/template": "^7.25.9",
-        "@babel/types": "^7.26.7"
-      },
-      "engines": {
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     "node_modules/@babel/parser": {
-      "version": "7.26.7",
-      "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.26.7.tgz",
-      "integrity": "sha512-kEvgGGgEjRUutvdVvZhbn/BxVt+5VSpwXz1j3WYXQbXDo8KzFOPNG2GQbdAiNq8g6wn1yKk7C/qrke03a84V+w==",
+      "version": "7.26.8",
+      "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.26.8.tgz",
+      "integrity": "sha512-TZIQ25pkSoaKEYYaHbbxkfL36GNsQ6iFiBbeuzAkLnXayKR1yP1zFe+NxuZWWsUyvt8icPU9CCq0sgWGXR1GEw==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
-        "@babel/types": "^7.26.7"
+        "@babel/types": "^7.26.8"
       },
       "bin": {
         "parser": "bin/babel-parser.js"
@@ -238,44 +74,10 @@
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-    "node_modules/@babel/template": {
-      "version": "7.25.9",
-      "resolved": "https://registry.npmjs.org/@babel/template/-/template-7.25.9.tgz",
-      "integrity": "sha512-9DGttpmPvIxBb/2uwpVo3dqJ+O6RooAFOS+lB+xDqoE2PVCE8nfoHMdZLpfCQRLwvohzXISPZcgxt80xLfsuwg==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
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-        "@babel/parser": "^7.25.9",
-        "@babel/types": "^7.25.9"
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-      "engines": {
-        "node": ">=6.9.0"
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-    "node_modules/@babel/traverse": {
-      "version": "7.26.7",
-      "resolved": "https://registry.npmjs.org/@babel/traverse/-/traverse-7.26.7.tgz",
-      "integrity": "sha512-1x1sgeyRLC3r5fQOM0/xtQKsYjyxmFjaOrLJNtZ81inNjyJHGIolTULPiSc/2qe1/qfpFLisLQYFnnZl7QoedA==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "@babel/code-frame": "^7.26.2",
-        "@babel/generator": "^7.26.5",
-        "@babel/parser": "^7.26.7",
-        "@babel/template": "^7.25.9",
-        "@babel/types": "^7.26.7",
-        "debug": "^4.3.1",
-        "globals": "^11.1.0"
-      },
-      "engines": {
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-      "version": "7.26.7",
-      "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.26.7.tgz",
-      "integrity": "sha512-t8kDRGrKXyp6+tjUh7hw2RLyclsW4TRoRvRHtSyAX9Bb5ldlFh+90YAYY6awRXrlB4G5G2izNeGySpATlFzmOg==",
+      "version": "7.26.8",
+      "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.26.8.tgz",
+      "integrity": "sha512-eUuWapzEGWFEpHFxgEaBG8e3n6S8L3MSu0oda755rOfabWPnh0Our1AozNFVUxGFIhbKgd1ksprsoDGMinTOTA==",
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@@ -818,9 +620,9 @@
       "license": "MIT"
     },
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-      "version": "4.32.1",
-      "resolved": "https://registry.npmjs.org/@rollup/rollup-android-arm-eabi/-/rollup-android-arm-eabi-4.32.1.tgz",
-      "integrity": "sha512-/pqA4DmqyCm8u5YIDzIdlLcEmuvxb0v8fZdFhVMszSpDTgbQKdw3/mB3eMUHIbubtJ6F9j+LtmyCnHTEqIHyzA==",
+      "version": "4.34.6",
+      "resolved": "https://registry.npmjs.org/@rollup/rollup-android-arm-eabi/-/rollup-android-arm-eabi-4.34.6.tgz",
+      "integrity": "sha512-+GcCXtOQoWuC7hhX1P00LqjjIiS/iOouHXhMdiDSnq/1DGTox4SpUvO52Xm+div6+106r+TcvOeo/cxvyEyTgg==",
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         "arm"
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@@ -832,9 +634,9 @@
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     "node_modules/@rollup/rollup-android-arm64": {
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+      "resolved": "https://registry.npmjs.org/@rollup/rollup-android-arm64/-/rollup-android-arm64-4.34.6.tgz",
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@@ -846,9 +648,9 @@
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-      "integrity": "sha512-zCpKHioQ9KgZToFp5Wvz6zaWbMzYQ2LJHQ+QixDKq52KKrF65ueu6Af4hLlLWHjX1Wf/0G5kSJM9PySW9IrvHA==",
+      "version": "4.34.6",
+      "resolved": "https://registry.npmjs.org/@rollup/rollup-darwin-arm64/-/rollup-darwin-arm64-4.34.6.tgz",
+      "integrity": "sha512-z9Ib+OzqN3DZEjX7PDQMHEhtF+t6Mi2z/ueChQPLS/qUMKY7Ybn5A2ggFoKRNRh1q1T03YTQfBTQCJZiepESAg==",
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@@ -860,9 +662,9 @@
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+      "version": "4.34.6",
+      "resolved": "https://registry.npmjs.org/@rollup/rollup-darwin-x64/-/rollup-darwin-x64-4.34.6.tgz",
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@@ -874,9 +676,9 @@
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+      "version": "4.34.6",
+      "resolved": "https://registry.npmjs.org/@rollup/rollup-freebsd-arm64/-/rollup-freebsd-arm64-4.34.6.tgz",
+      "integrity": "sha512-YSwyOqlDAdKqs0iKuqvRHLN4SrD2TiswfoLfvYXseKbL47ht1grQpq46MSiQAx6rQEN8o8URtpXARCpqabqxGQ==",
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@@ -888,9 +690,9 @@
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+      "resolved": "https://registry.npmjs.org/@rollup/rollup-freebsd-x64/-/rollup-freebsd-x64-4.34.6.tgz",
+      "integrity": "sha512-HEP4CgPAY1RxXwwL5sPFv6BBM3tVeLnshF03HMhJYCNc6kvSqBgTMmsEjb72RkZBAWIqiPUyF1JpEBv5XT9wKQ==",
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@@ -902,9 +704,9 @@
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     "node_modules/@rollup/rollup-linux-arm-gnueabihf": {
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@@ -916,9 +718,9 @@
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@@ -930,9 +732,9 @@
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@@ -944,9 +746,9 @@
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+      "version": "4.34.6",
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@@ -958,9 +760,9 @@
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     }
   }
 }
diff --git a/package.json b/package.json
index 426fe10..8baa70a 100644
--- a/package.json
+++ b/package.json
@@ -22,7 +22,7 @@
     "url": "git+https://github.com/askonomm/flatmatter.git"
   },
   "scripts": {
-    "bundle": "tsup src/index.ts",
+    "bundle": "tsup src/flatmatter.ts",
     "test": "vitest",
     "coverage": "vitest run --coverage"
   },
@@ -30,13 +30,15 @@
     "node": ">=18"
   },
   "devDependencies": {
-    "@vitest/coverage-istanbul": "^2.1.8",
+    "@types/node": "^22.10.10",
     "@vitest/coverage-v8": "^2.1.8",
     "@vitest/ui": "^2.1.8",
     "tsup": "^8.3.5",
     "typescript": "^5.7.3",
-    "@types/node": "^22.10.10",
     "vite": "^5.4.11",
     "vitest": "^2.1.8"
+  },
+  "dependencies": {
+    "effect": "^3.12.10"
   }
 }
diff --git a/src/flatmatter.test.ts b/src/flatmatter.test.ts
index 9f00ef9..8e480fc 100644
--- a/src/flatmatter.test.ts
+++ b/src/flatmatter.test.ts
@@ -1,32 +1,185 @@
 import FlatMatter from "./flatmatter.ts";
 import { assert } from "vitest";
-import ToObject from "./serializers/to_object.ts";
+
+test("Single-level configuration", () => {
+  const config = FlatMatter.config(
+    'a: true\nb: false\nc: 1\nd: 12.5\nf: "some string"',
+  );
+
+  expect(config).toStrictEqual({
+    a: true,
+    b: false,
+    c: 1,
+    d: 12.5,
+    f: "some string",
+  });
+});
+
+test("Two-level configuration", () => {
+  const config = FlatMatter.config(
+    'a.a: true\nb.b: false\nc.c: 1\nd.d: 12.5\nf.f: "some string"',
+  );
+
+  expect(config).toStrictEqual({
+    a: {
+      a: true,
+    },
+    b: {
+      b: false,
+    },
+    c: {
+      c: 1,
+    },
+    d: {
+      d: 12.5,
+    },
+    f: {
+      f: "some string",
+    },
+  });
+});
+
+test("Simple function usage", () => {
+  const toUpper = {
+    name: "to-upper",
+    compute: (input: string): unknown => {
+      return input.toUpperCase();
+    },
+  };
+
+  const config = FlatMatter.config('a: (to-upper "value")', [toUpper]);
+
+  expect(config).toStrictEqual({
+    a: "VALUE",
+  });
+});
+
+test("Piped function by reference usage", () => {
+  const toUpper = {
+    name: "to-upper",
+    compute: (input: string): unknown => {
+      return input.toUpperCase();
+    },
+  };
+
+  const config = FlatMatter.config('a: "value" / to-upper', [toUpper]);
+
+  expect(config).toStrictEqual({
+    a: "VALUE",
+  });
+});
+
+test("Piped function by call usage", () => {
+  const toUpper = {
+    name: "to-upper",
+    compute: (input: string, additional: number): unknown => {
+      return `${input.toUpperCase()}-${additional}`;
+    },
+  };
+
+  const config = FlatMatter.config('a: "value" / (to-upper 123)', [toUpper]);
+
+  expect(config).toStrictEqual({
+    a: "VALUE-123",
+  });
+});
+
+test("Invalid value in pipe", () => {
+  const config = FlatMatter.config('a: "value" / / asd');
+
+  expect(config).toStrictEqual({});
+});
+
+test("Invalid value in pipe, 2", () => {
+  const config = FlatMatter.config('a: "value" / asd');
+
+  expect(config).toStrictEqual({
+    a: "value",
+  });
+});
+
+test("Only piped functions", () => {
+  const firstFn = {
+    name: "first-fn",
+    compute: (input: string): unknown => {
+      return input.toUpperCase();
+    },
+  };
+
+  const secondFn = {
+    name: "second-fn",
+    compute: (input: string): unknown => {
+      return `${input}-passed-by-second`;
+    },
+  };
+
+  const config = FlatMatter.config('a: (first-fn "value / here") / second-fn', [
+    firstFn,
+    secondFn,
+  ]);
+
+  expect(config).toStrictEqual({
+    a: "VALUE / HERE-passed-by-second",
+  });
+});
+
+test("Function call without any args", () => {
+  const toUpper = {
+    name: "to-upper",
+    compute: (input: string): unknown => {
+      return input.toUpperCase();
+    },
+  };
+
+  const config = FlatMatter.config('a: "value" / (to-upper)', [toUpper]);
+
+  expect(config).toStrictEqual({
+    a: "VALUE",
+  });
+});
+
+test("Function call using multiple strings with spaces as arg", () => {
+  const toUpper = {
+    name: "to-upper",
+    compute: (input: string): unknown => {
+      return input.toUpperCase();
+    },
+  };
+
+  const config = FlatMatter.config(
+    'a: (to-upper "value goes here" "and here")',
+    [toUpper],
+  );
+
+  expect(config).toStrictEqual({
+    a: "VALUE GOES HERE",
+  });
+});
 
 test("Line has no value separator", () => {
   assert.throws(
-    () => new FlatMatter("test"),
-    "Line on index 0 doesn't have a value separator."
+    () => FlatMatter.config("test"),
+    "Line on index 0 doesn't have a value separator.",
   );
 });
 
 test("Line can only have one value separator", () => {
   assert.throws(
-    () => new FlatMatter("test: this: that"),
-    "Line on index 0 has multiple value separators."
+    () => FlatMatter.config("test: this: that"),
+    "Line on index 0 has multiple value separators.",
   );
 });
 
 test("String values can have colon characters", () => {
-  assert.doesNotThrow(() => new FlatMatter('test: "this : that"'), Error);
+  assert.doesNotThrow(() => FlatMatter.config('test: "this : that"'), Error);
 });
 
 test("FrontMatter creates a new content entry", () => {
-  const fm = new FlatMatter(
-    `---\nthis: true\n---\n\nMarkdown goes here.\n\nAnd here.`
+  const config = FlatMatter.config(
+    `---\nthis: true\n---\n\nMarkdown goes here.\n\nAnd here.`,
   );
-  const result = fm.serialize(new ToObject());
 
-  assert.deepEqual(result, {
+  assert.deepEqual(config, {
     this: true,
     content: "Markdown goes here.\n\nAnd here.",
   });
diff --git a/src/flatmatter.ts b/src/flatmatter.ts
index e81df1f..1185020 100644
--- a/src/flatmatter.ts
+++ b/src/flatmatter.ts
@@ -1,106 +1,63 @@
 import { EOL } from "node:os";
+import * as Effect from "effect/Effect";
+import * as Context from "effect/Context";
+import * as Ref from "effect/Ref";
+import * as Cause from "effect/Cause";
+import * as Option from "effect/Option";
+import * as Schema from "effect/Schema";
 import { trimChar } from "./utils.ts";
+import ToJson from "./serializers/to_json.ts";
 
-export type ParsedValue = {
-  value: unknown;
-  computeActions: ComputeAction[];
-};
-
-export type ComputeAction = {
-  identifier: string;
-  args: Array<unknown>;
-};
+const ComputeAction = Schema.Struct({
+  identifier: Schema.NonEmptyString,
+  args: Schema.Array(Schema.Unknown),
+});
 
-export interface Serializer<T> {
-  serialize(config: Record<string, unknown>): T;
-}
+const ParsedValue = Schema.Struct({
+  value: Schema.Unknown,
+  computeActions: Schema.Array(ComputeAction),
+});
 
-export interface FlatMatterFn {
+type Function = {
   name: string;
-
   compute(...args: unknown[]): unknown;
-}
-
-export default class FlatMatter {
-  private content: string;
-  private parsedConfig: Record<string, unknown> = {};
-  private functions: FlatMatterFn[];
-
-  constructor(content: string, functions: FlatMatterFn[] = []) {
-    this.content = content;
-    this.functions = functions;
-    this.parse();
-  }
-
-  private parse(): void {
-    const lines = this.content.split(EOL);
-    let frontMatterBreakCount = 0;
-
-    for (let i = 0; i < lines.length; i++) {
-      if (lines[i].trim() === "---" && frontMatterBreakCount < 2) {
-        frontMatterBreakCount++;
-        continue;
-      }
-
-      // FlatMatter ends, Markdown begins
-      if (frontMatterBreakCount < 2) {
-        this.parseLine(i, lines[i]);
-        continue;
-      }
-
-      this.parsedConfig.content = lines.slice(i).join(EOL).trim();
-      break;
-    }
-  }
-
-  /**
-   * Parses a given line of FlatMatter.
-   */
-  private parseLine(idx: number, line: string): void {
-    this.validateLineConformance(idx, line);
-
-    const keys = line.split(":")[0].trim().split(".");
-    const value = line.split(":").slice(1).join(":").trim();
-    const parsedValue = this.parseValue(value);
-
-    if (!parsedValue) return;
-
-    const config = keys.reduceRight((acc, key) => {
-      return { [key]: acc };
-    }, this.computeValue(parsedValue)) as Record<string, unknown>;
-
-    this.parsedConfig = { ...this.parsedConfig, ...config };
-  }
-
-  /**
-   * For better developer experience, this validates each line
-   * against some common mistakes you can make, and throws an Error
-   * if you did.
-   */
-  private validateLineConformance(idx: number, line: string): void {
-    const validators = [
-      this.validateLineHasKeyVal,
-      this.validateLineHasOnlyOneColonChar,
-    ];
-
-    for (const validator of validators) {
-      validator(idx, line);
-    }
-  }
+};
 
-  /**
-   * Validates that the given line has a value separator.
-   */
-  private validateLineHasKeyVal(idx: number, line: string): void {
+class FunctionsState extends Context.Tag("FunctionsState")<
+  FunctionsState,
+  Ref.Ref<Function[]>
+>() {}
+
+/**
+ * State for holding the content string.
+ */
+class ContentState extends Context.Tag("ContentState")<
+  ContentState,
+  Ref.Ref<string>
+>() {}
+
+/**
+ * State for holding the parsed configuration.
+ */
+class ConfigState extends Context.Tag("ConfigState")<
+  ConfigState,
+  Ref.Ref<Record<string, unknown>>
+>() {}
+
+const validateLineHasKeyValEffect = (idx: number, line: string) =>
+  Effect.gen(function* () {
     if (!line.includes(":")) {
-      throw new Error(`Line on index ${idx} doesn't have a value separator.`);
+      yield* Effect.fail(
+        Cause.fail(`Line on index ${idx} doesn't have a value separator.`),
+      );
     }
-  }
+  });
 
-  /**
-   * Validates that the given line has only one value separator.
-   */
-  private validateLineHasOnlyOneColonChar(idx: number, line: string): void {
+/**
+ * Validates that the given line has only one value separator.
+ */
+const validateLineHasOnlyOneColonCharEffect = (idx: number, line: string) =>
+  Effect.gen(function* () {
     let separatorCount = 0;
     let parts = line.split(":").slice(1);
 
@@ -114,242 +71,283 @@ export default class FlatMatter {
     }
 
     if (separatorCount > 1) {
-      throw new Error(`Line on index ${idx} has multiple value separators.`);
+      yield* Effect.fail(
+        Cause.fail(`Line on index ${idx} has multiple value separators.`),
+      );
     }
-  }
+  });
+
+const validateLineConformanceEffect = (idx: number, line: string) =>
+  Effect.gen(function* () {
+    const validatorEffects = [
+      validateLineHasKeyValEffect,
+      validateLineHasOnlyOneColonCharEffect,
+    ];
+
+    for (const validatorEffect of validatorEffects) {
+      yield* validatorEffect(idx, line);
+    }
+  });
 
-  /**
-   * Detects if the value is a simple value. A simple value is any
-   * of the following: `"a string"`, boolean `true` or `false`, or
-   * anything numeric like `12345` or `123.45`.
-   */
-  private isSimpleValue(value: string): boolean {
-    const isString = value.startsWith('"') && value.endsWith('"');
-    const isBoolean = value === "true" || value === "false";
-    const isNumber = !isNaN(parseFloat(value));
-
-    return isString || isBoolean || isNumber;
+const isSimpleValue = (value: string): boolean => {
+  const isString = value.startsWith('"') && value.endsWith('"');
+  const isBoolean = value === "true" || value === "false";
+  const isNumber = !isNaN(parseFloat(value));
+
+  return isString || isBoolean || isNumber;
+};
+
+const parseSimpleValue = (value: string): string | number | boolean => {
+  if (value === "true" || value === "false") {
+    return value === "true";
   }
 
-  /**
-   * Detects if the value is a function value. A function value is any
-   * of the following:
-   *
-   * - A function call with arguments: `(function-name *args)`
-   * - A function call by reference: `function-name`
-   */
-  private isFunctionValue(value: string): boolean {
-    const isFnCall = value.startsWith("(") && value.endsWith(")");
-    const isFnReference = !!value.match(/^([a-zA-Z0-9_-]+)$/);
-
-    return isFnCall || isFnReference;
+  if (!Number.isNaN(parseInt(value)) && value.indexOf(".") === -1) {
+    return parseInt(value);
   }
 
-  /**
-   * Detects if the value is a piped value. A piped value is a mix of
-   * simple and function value parts, piped together with the forward
-   * slash `/` character. For example:
-   *
-   * ```yaml
-   * posts: (get-content "posts") / (limit 10) / only-published
-   * ```
-   *
-   * or:
-   *
-   *  ```yaml
-   * posts: "posts" / get-content / (limit 10) / only-published
-   * ```
-   *
-   * The result of the previous pipe gets passed to the next as a first
-   * argument.
-   */
-  private isPipedValue(value: string): boolean {
-    return this.composePipedValueParts(value).every((part) => {
-      return this.isSimpleValue(part) || this.isFunctionValue(part);
-    });
+  if (!Number.isNaN(parseFloat(value)) && value.indexOf(".") !== -1) {
+    return parseFloat(value);
   }
 
-  /**
-   * Parses a value to a `ParsedValue` object, or `null`
-   * in case it could not for whatever reason.
-   */
-  private parseValue(value: string): ParsedValue | null {
-    if (this.isSimpleValue(value)) {
-      return {
-        value: this.parseSimpleValue(value),
-        computeActions: [],
-      };
-    }
+  return trimChar(value, '"');
+};
 
-    if (this.isFunctionValue(value)) {
-      return {
-        value: null,
-        computeActions: [this.parseFunctionValue(value)],
-      };
-    }
+const isFunctionValue = (value: string): boolean => {
+  const isFnCall = value.startsWith("(") && value.endsWith(")");
+  const isFnReference = !!value.match(/^([a-zA-Z0-9_-]+)$/);
 
-    if (this.isPipedValue(value)) {
-      return this.parsePipedValue(value);
-    }
+  return isFnCall || isFnReference;
+};
 
-    return null;
+const parseFunctionValueArgs = (value: string): unknown[] => {
+  const parts = value
+    .substring(1, value.length - 1)
+    .split(" ")
+    .slice(1);
+
+  if (!parts.length) {
+    return [];
   }
 
-  /**
-   * Parses the value part of a line into a simple value, like for example
-   * a `string`, `number` or `boolean`.
-   */
-  private parseSimpleValue(value: string): string | number | boolean {
-    if (value === "true" || value === "false") {
-      return value === "true";
-    }
+  const normalizedParts = [parts[0]];
 
-    if (!Number.isNaN(parseInt(value)) && value.indexOf(".") === -1) {
-      return parseInt(value);
-    }
+  for (let i = 1; i < parts.length; i++) {
+    const untilCurrent = normalizedParts.join(" ");
+    const quoteCount = untilCurrent.split('"').length - 1;
 
-    if (!Number.isNaN(parseFloat(value)) && value.indexOf(".") !== -1) {
-      return parseFloat(value);
+    if (quoteCount % 2 === 0) {
+      normalizedParts.push(parts[i]);
+      continue;
     }
 
-    return trimChar(value, '"');
+    const lastIndex = normalizedParts.length - 1;
+    const lastPart = normalizedParts[lastIndex];
+
+    normalizedParts[lastIndex] = `${lastPart} ${parts[i]}`;
   }
 
-  /**
-   * Parses the value part of a line into a Compute Action, which is
-   * later executed to run the function described in FlatMatter.
-   */
-  private parseFunctionValue(value: string): ComputeAction {
-    const isFn = value.startsWith("(") && value.endsWith(")");
-
-    if (!isFn) {
-      return {
-        identifier: value,
-        args: [],
-      };
-    }
+  return normalizedParts.map((part) => parseSimpleValue(part));
+};
 
-    const fnName = trimChar(value, ["(", ")"]).split(" ")[0].trim();
-    const fnArgs = this.parseFunctionValueArgs(value);
+const parseFunctionValue = (
+  value: string,
+): Schema.Schema.Type<typeof ComputeAction> => {
+  const isFn = value.startsWith("(") && value.endsWith(")");
 
-    return {
-      identifier: fnName,
-      args: fnArgs,
-    };
+  if (!isFn) {
+    return ComputeAction.make({
+      identifier: value,
+      args: [],
+    });
   }
 
-  /**
-   * Parses the value part of a line into a ParsedValue, which is
-   * composed out of piped parts separated by the forward slash `/` character.
-   *
-   * The ParsedValue will include the default value, if any, and a list of compute
-   * actions which will later be executed.
-   */
-  private parsePipedValue(value: string): ParsedValue {
-    const parts = this.composePipedValueParts(value);
-
-    if (this.isSimpleValue(parts[0])) {
-      return {
-        value: this.parseSimpleValue(parts[0]),
-        computeActions: parts.slice(1).map((p) => this.parseFunctionValue(p)),
-      };
-    }
+  const fnName = trimChar(value, ["(", ")"]).split(" ")[0].trim();
+  const fnArgs = parseFunctionValueArgs(value);
 
-    return {
-      value: null,
-      computeActions: parts.map((p) => this.parseFunctionValue(p)),
-    };
-  }
+  return ComputeAction.make({
+    identifier: fnName,
+    args: fnArgs,
+  });
+};
+
+const composePipedValueParts = (value: string): string[] => {
+  const parts = value.split(" / ");
+  const normalizedParts = [parts[0]];
+
+  for (let i = 1; i < parts.length; i++) {
+    const untilCurrent = normalizedParts.join(" / ");
+    const quoteCount = untilCurrent.split('"').length - 1;
 
-  /**
-   * Takes the entire value part of a line and, assuming it is a function value,
-   * parses it into a list of arguments to be passed down to the function.
-   */
-  private parseFunctionValueArgs(value: string): unknown[] {
-    const parts = value
-      .substring(1, value.length - 1)
-      .split(" ")
-      .slice(1);
-
-    if (!parts.length) {
-      return [];
+    if (quoteCount % 2 === 0) {
+      normalizedParts.push(parts[i]);
+      continue;
     }
 
-    const normalizedParts = [parts[0]];
+    const lastIndex = normalizedParts.length - 1;
+    const lastPart = normalizedParts[lastIndex];
 
-    for (let i = 1; i < parts.length; i++) {
-      const untilCurrent = normalizedParts.join(" ");
-      const quoteCount = untilCurrent.split('"').length - 1;
+    normalizedParts[lastIndex] = `${lastPart} / ${parts[i]}`;
+  }
 
-      if (quoteCount % 2 === 0) {
-        normalizedParts.push(parts[i]);
-        continue;
-      }
+  return normalizedParts;
+};
 
-      const lastIndex = normalizedParts.length - 1;
-      const lastPart = normalizedParts[lastIndex];
+const isPipedValue = (value: string): boolean => {
+  return composePipedValueParts(value).every((part) => {
+    return isSimpleValue(part) || isFunctionValue(part);
+  });
+};
 
-      normalizedParts[lastIndex] = `${lastPart} ${parts[i]}`;
-    }
+const parsePipedValue = (value: string): typeof ParsedValue.Type => {
+  const parts = composePipedValueParts(value);
 
-    return normalizedParts.map((part) => this.parseSimpleValue(part));
+  if (isSimpleValue(parts[0])) {
+    return ParsedValue.make({
+      value: parseSimpleValue(parts[0]),
+      computeActions: parts.slice(1).map((p) => parseFunctionValue(p)),
+    });
   }
 
-  /**
-   * Takes an entire value of a line and composes it into a list
-   * of piped parts.
-   */
-  private composePipedValueParts(value: string): string[] {
-    const parts = value.split(" / ");
-    const normalizedParts = [parts[0]];
-
-    for (let i = 1; i < parts.length; i++) {
-      const untilCurrent = normalizedParts.join(" / ");
-      const quoteCount = untilCurrent.split('"').length - 1;
+  return ParsedValue.make({
+    value: null,
+    computeActions: parts.map((p) => parseFunctionValue(p)),
+  });
+};
 
-      if (quoteCount % 2 === 0) {
-        normalizedParts.push(parts[i]);
-        continue;
-      }
+const parseValueEffect = (value: string) =>
+  Effect.gen(function* () {
+    if (isSimpleValue(value)) {
+      return Option.some(
+        ParsedValue.make({
+          value: parseSimpleValue(value),
+          computeActions: [],
+        }),
+      );
+    }
 
-      const lastIndex = normalizedParts.length - 1;
-      const lastPart = normalizedParts[lastIndex];
+    if (isFunctionValue(value)) {
+      return Option.some(
+        ParsedValue.make({
+          value: null,
+          computeActions: [parseFunctionValue(value)],
+        }),
+      );
+    }
 
-      normalizedParts[lastIndex] = `${lastPart} / ${parts[i]}`;
+    if (isPipedValue(value)) {
+      return Option.some(parsePipedValue(value));
     }
 
-    return normalizedParts;
-  }
+    return Option.none();
+  });
 
-  /**
-   * Takes ParsedValue and, optionally an initial value, and runs
-   * compute actions over it to return the final computed value.
-   */
-  private computeValue(parsedValue: ParsedValue): unknown {
+const computeValueEffect = (parsedValue: typeof ParsedValue.Type) =>
+  Effect.gen(function* () {
     let value = parsedValue.value;
+    const functions = yield* Ref.get(yield* FunctionsState);
 
-    for (const ca of parsedValue.computeActions) {
-      const fnInstance = this.functions.find((f) => f.name === ca.identifier);
+    for (const computeAction of parsedValue.computeActions) {
+      const fn = functions.find((f) => f.name === computeAction.identifier);
 
-      if (!fnInstance) {
+      if (!fn) {
         continue;
       }
 
       if (value !== null) {
-        ca.args = [value, ...ca.args];
+        value = fn.compute(value, ...computeAction.args);
+        continue;
       }
 
-      value = fnInstance.compute(...ca.args);
+      value = fn.compute(...computeAction.args);
     }
 
     return value;
-  }
+  });
+
+const parseLineEffect = (idx: number, line: string) =>
+  Effect.gen(function* () {
+    yield* validateLineConformanceEffect(idx, line);
+
+    const keys = line.split(":")[0].trim().split(".");
+    const value = line.split(":").slice(1).join(":").trim();
+    const parsedValue = yield* parseValueEffect(value);
+
+    if (Option.isNone(parsedValue)) return;
+
+    const updatedConfig = keys.reduceRight(
+      (acc, key) => {
+        return { [key]: acc };
+      },
+      yield* computeValueEffect(parsedValue.value),
+    ) as Record<string, unknown>;
+
+    yield* Ref.update(yield* ConfigState, (config) => {
+      return { ...config, ...updatedConfig };
+    });
+  });
+
+const parseContentEffect = Effect.gen(function* () {
+  const content = yield* Ref.get(yield* ContentState);
+  const lines = content.split(EOL);
+  let frontMatterBreakCount = 0;
 
-  /**
-   * Takes a Serializer and uses it to transform internal data
-   * object to a desired output.
-   */
-  public serialize<T>(serializer: Serializer<T>): T {
-    return serializer.serialize(this.parsedConfig);
+  for (let i = 0; i < lines.length; i++) {
+    if (lines[i].trim() === "---" && frontMatterBreakCount < 2) {
+      frontMatterBreakCount++;
+      continue;
+    }
+
+    if (frontMatterBreakCount < 2) {
+      yield* parseLineEffect(i, lines[i]);
+      continue;
+    }
+
+    // FlatMatter ends, Markdown begins
+    yield* Ref.update(yield* ConfigState, (config) => {
+      config.content = lines.slice(i).join(EOL).trim();
+      return config;
+    });
+
+    break;
   }
-}
+});
+
+/**
+ *
+ */
+const composeConfigEffect = Effect.gen(function* () {
+  yield* parseContentEffect;
+
+  return yield* Ref.get(yield* ConfigState);
+});
+
+const config = (
+  content: string,
+  functions: Function[] = [],
+): Record<string, unknown> => {
+  return Effect.runSync(
+    composeConfigEffect.pipe(
+      Effect.provideServiceEffect(ContentState, Ref.make(content)),
+      Effect.provideServiceEffect(ConfigState, Ref.make({})),
+      Effect.provideServiceEffect(FunctionsState, Ref.make(functions)),
+    ),
+  );
+};
+
+export type Serializer<T> = (config: Record<string, unknown>) => T;
+
+const serialize = <T,>(
+  config: Record<string, unknown>,
+  serializer: Serializer<T>,
+): T => {
+  return serializer(config);
+};
+
+export default {
+  config,
+  serialize,
+  Serializers: {
+    ToJson,
+  },
+};
diff --git a/src/index.ts b/src/index.ts
deleted file mode 100644
index 7ac5415..0000000
--- a/src/index.ts
+++ /dev/null
@@ -1,11 +0,0 @@
-import FlatMatter, {FlatMatterFn, Serializer} from "./flatmatter.ts";
-import ToObject from "./serializers/to_object.ts";
-import ToJson from "./serializers/to_json.ts";
-
-export {
-    FlatMatter,
-    FlatMatterFn,
-    Serializer,
-    ToObject,
-    ToJson,
-}
\ No newline at end of file
diff --git a/src/serializers/to_json.test.ts b/src/serializers/to_json.test.ts
index 4184ab1..78f704a 100644
--- a/src/serializers/to_json.test.ts
+++ b/src/serializers/to_json.test.ts
@@ -2,11 +2,11 @@ import FlatMatter from "../flatmatter.ts";
 import ToJson from "./to_json.ts";
 
 test("Single-level configuration", () => {
-  const fm = new FlatMatter(
-    'a: true\nb: false\nc: 1\nd: 12.5\nf: "some string"'
+  const config = FlatMatter.config(
+    'a: true\nb: false\nc: 1\nd: 12.5\nf: "some string"',
   );
 
   const equal = '{"a":true,"b":false,"c":1,"d":12.5,"f":"some string"}';
 
-  expect(fm.serialize(new ToJson())).toStrictEqual(equal);
+  expect(FlatMatter.serialize(config, ToJson)).toStrictEqual(equal);
 });
diff --git a/src/serializers/to_json.ts b/src/serializers/to_json.ts
index 30cf417..c61a98f 100644
--- a/src/serializers/to_json.ts
+++ b/src/serializers/to_json.ts
@@ -1,7 +1,9 @@
 import type { Serializer } from "../flatmatter.ts";
 
-export default class ToJson implements Serializer<string> {
-  serialize(config: Record<string, unknown>): string {
-    return JSON.stringify(config);
-  }
-}
+const ToJson: Serializer<string> = (
+  config: Record<string, unknown>,
+): string => {
+  return JSON.stringify(config);
+};
+
+export default ToJson;
diff --git a/src/serializers/to_object.test.ts b/src/serializers/to_object.test.ts
deleted file mode 100644
index 28cb78e..0000000
--- a/src/serializers/to_object.test.ts
+++ /dev/null
@@ -1,171 +0,0 @@
-import FlatMatter, { type FlatMatterFn } from "../flatmatter.ts";
-import ToObject from "./to_object.ts";
-
-test("Single-level configuration", () => {
-  const fm = new FlatMatter(
-    'a: true\nb: false\nc: 1\nd: 12.5\nf: "some string"'
-  );
-
-  expect(fm.serialize(new ToObject())).toStrictEqual({
-    a: true,
-    b: false,
-    c: 1,
-    d: 12.5,
-    f: "some string",
-  });
-});
-
-test("Two-level configuration", () => {
-  const fm = new FlatMatter(
-    'a.a: true\nb.b: false\nc.c: 1\nd.d: 12.5\nf.f: "some string"'
-  );
-
-  expect(fm.serialize(new ToObject())).toStrictEqual({
-    a: {
-      a: true,
-    },
-    b: {
-      b: false,
-    },
-    c: {
-      c: 1,
-    },
-    d: {
-      d: 12.5,
-    },
-    f: {
-      f: "some string",
-    },
-  });
-});
-
-test("Simple function usage", () => {
-  class ToUpper implements FlatMatterFn {
-    name = "to-upper";
-
-    compute(input: string): unknown {
-      return input.toUpperCase();
-    }
-  }
-
-  const fm = new FlatMatter('a: (to-upper "value")', [new ToUpper()]);
-  const config = fm.serialize(new ToObject());
-
-  expect(config).toStrictEqual({
-    a: "VALUE",
-  });
-});
-
-test("Piped function by reference usage", () => {
-  class ToUpper implements FlatMatterFn {
-    name = "to-upper";
-
-    compute(input: string): unknown {
-      return input.toUpperCase();
-    }
-  }
-
-  const fm = new FlatMatter('a: "value" / to-upper', [new ToUpper()]);
-  const config = fm.serialize(new ToObject());
-
-  expect(config).toStrictEqual({
-    a: "VALUE",
-  });
-});
-
-test("Piped function by call usage", () => {
-  class ToUpper implements FlatMatterFn {
-    name = "to-upper";
-
-    compute(input: string, additional: number): unknown {
-      return `${input.toUpperCase()}-${additional}`;
-    }
-  }
-
-  const fm = new FlatMatter('a: "value" / (to-upper 123)', [new ToUpper()]);
-  const config = fm.serialize(new ToObject());
-
-  expect(config).toStrictEqual({
-    a: "VALUE-123",
-  });
-});
-
-test("Invalid value in pipe", () => {
-  const fm = new FlatMatter('a: "value" / / asd');
-  const config = fm.serialize(new ToObject());
-
-  expect(config).toStrictEqual({});
-});
-
-test("Invalid value in pipe, 2", () => {
-  const fm = new FlatMatter('a: "value" / asd');
-  const config = fm.serialize(new ToObject());
-
-  expect(config).toStrictEqual({
-    a: "value",
-  });
-});
-
-test("Only piped functions", () => {
-  class FirstFn implements FlatMatterFn {
-    name = "first-fn";
-
-    compute(input: string): unknown {
-      return input.toUpperCase();
-    }
-  }
-
-  class SecondFn implements FlatMatterFn {
-    name = "second-fn";
-
-    compute(input: string): unknown {
-      return `${input}-passed-by-second`;
-    }
-  }
-
-  const fm = new FlatMatter('a: (first-fn "value / here") / second-fn', [
-    new FirstFn(),
-    new SecondFn(),
-  ]);
-  const config = fm.serialize(new ToObject());
-
-  expect(config).toStrictEqual({
-    a: "VALUE / HERE-passed-by-second",
-  });
-});
-
-test("Function call without any args", () => {
-  class ToUpper implements FlatMatterFn {
-    name = "to-upper";
-
-    compute(input: string): unknown {
-      return input.toUpperCase();
-    }
-  }
-
-  const fm = new FlatMatter('a: "value" / (to-upper)', [new ToUpper()]);
-  const config = fm.serialize(new ToObject());
-
-  expect(config).toStrictEqual({
-    a: "VALUE",
-  });
-});
-
-test("Function call using multiple strings with spaces as arg", () => {
-  class ToUpper implements FlatMatterFn {
-    name = "to-upper";
-
-    compute(input: string): unknown {
-      return input.toUpperCase();
-    }
-  }
-
-  const fm = new FlatMatter('a: (to-upper "value goes here" "and here")', [
-    new ToUpper(),
-  ]);
-  const config = fm.serialize(new ToObject());
-
-  expect(config).toStrictEqual({
-    a: "VALUE GOES HERE",
-  });
-});
diff --git a/src/serializers/to_object.ts b/src/serializers/to_object.ts
deleted file mode 100644
index 79b2886..0000000
--- a/src/serializers/to_object.ts
+++ /dev/null
@@ -1,7 +0,0 @@
-import type { Serializer } from "../flatmatter.ts";
-
-export default class ToObject implements Serializer<Record<string, unknown>> {
-  serialize(config: Record<string, unknown>): Record<string, unknown> {
-    return config;
-  }
-}
diff --git a/tsconfig.json b/tsconfig.json
index 21eeee6..60e3198 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -13,6 +13,7 @@
     "outDir": "dist",
     "strict": true,
     "esModuleInterop": true,
+    "exactOptionalPropertyTypes": true,
     "lib": ["esnext"],
     "types": ["vitest/globals"]
   }
diff --git a/tsup.config.ts b/tsup.config.ts
index 76a9a74..ca2b9c0 100644
--- a/tsup.config.ts
+++ b/tsup.config.ts
@@ -1,8 +1,10 @@
-import {defineConfig} from "tsup";
+import { defineConfig } from "tsup";
 
 export default defineConfig({
-    entry: ["src/index.ts"],
-    clean: true,
-    format: ["cjs", "esm"],
-    dts: true
-})
\ No newline at end of file
+  entry: ["src/flatmatter.ts"],
+  clean: true,
+  format: ["cjs", "esm"],
+  dts: true,
+  treeshake: "smallest",
+  sourcemap: true,
+});