diff --git a/packages/fta/@types/fta-cli.d.ts b/packages/fta/@types/fta-cli.d.ts
new file mode 100644
index 0000000..a3cfaf9
--- /dev/null
+++ b/packages/fta/@types/fta-cli.d.ts
@@ -0,0 +1,154 @@
+declare module "fta-cli" {
+  /**
+   * Represents an analyzed file with all its metrics.
+   *
+   * @property {string} file_name - The name of the file.
+   * @property {number} cyclo - The cyclomatic complexity of the file.
+   * @property {Object} halstead - The Halstead metrics of the file, a complexity measure.
+   * @property {number} halstead.uniq_operators - The number of unique operators.
+   * @property {number} halstead.uniq_operands - The number of unique operands.
+   * @property {number} halstead.total_operators - The total number of operators.
+   * @property {number} halstead.total_operands - The total number of operands.
+   * @property {number} halstead.program_length - The total count of operators and operands. (N)
+   * @property {number} halstead.vocabulary_size - The total count of unique operators and operands. (n)
+   * @property {number} halstead.volume - A measure of the size of the program. V = N * log2(n). (V)
+   * @property {number} halstead.difficulty - Quantifies how difficult a program is to write or understand. D = (n1/2) * (N2/n2). (D)
+   * @property {number} halstead.effort - An estimation of the amount of work required to write a program. E = D * V.
+   * @property {number} halstead.time - An estimation of the time required to write the program. T = E / 18 (seconds).
+   * @property {number} halstead.bugs - An estimation of the number of bugs in the program. B = V / 3000.
+   * @property {number} line_count - The number of lines in the file.
+   * @property {number} fta_score - The FTA score of the file.
+   * @property {string} assessment - The assessment of the file.
+   */
+  export type AnalyzedFile = {
+    /**
+     * The name of the file.
+     *
+     * @type {string}
+     */
+    file_name: string;
+    /**
+     * The cyclomatic complexity of the file.
+     *
+     * @type {number}
+     */
+    cyclo: number;
+    /**
+     * The Halstead metrics of the file, a complexity measure.
+     * For further information see the [docs](https://ftaproject.dev/docs/scoring)
+     *
+     * @type {Object}
+     */
+    halstead: {
+      /**
+       * The number of unique operators.
+       *
+       * @type {number}
+       */
+      uniq_operators: number;
+      /**
+       * The number of unique operands.
+       *
+       * @type {number}
+       */
+      uniq_operands: number;
+      /**
+       * The total number of operators.
+       *
+       * @type {number}
+       */
+      total_operators: number;
+      /**
+       * The total number of operands.
+       *
+       * @type {number}
+       */
+      total_operands: number;
+      /**
+       * The total count of operators and operands.
+       *
+       * @type {number}
+       */
+      program_length: number;
+      /**
+       * The total count of unique operators and operands.
+       *
+       * @type {number}
+       */
+      vocabulary_size: number;
+      /**
+       * A measure of the size of the program. V = N * log2(n).
+       *
+       * @type {number}
+       */
+      volume: number;
+      /**
+       * Quantifies how difficult a program is to write or understand. D = (n1/2) * (N2/n2).
+       *
+       * @type {number}
+       */
+      difficulty: number;
+      /**
+       * An estimation of the amount of work required to write a program. E = D * V.
+       *
+       * @type {number}
+       */
+      effort: number;
+      /**
+       * An estimation of the time required to write the program. T = E / 18 (seconds).
+       *
+       * @type {number}
+       */
+      time: number;
+      /**
+       * An estimation of the number of bugs in the program. B = V / 3000.
+       *
+       * @type {number}
+       */
+      bugs: number;
+    };
+    /**
+     * The number of lines in the file.
+     *
+     * @type {number}
+     */
+    line_count: number;
+    /**
+     * The FTA score of the file.
+     *
+     * @type {number}
+     */
+    fta_score: number;
+    /**
+     * The assessment of the file.
+     *
+     * @type {string}
+     */
+    assessment: string;
+  };
+
+  /**
+   * Represents the possible options for the FTA-Analysis.
+   *
+   * @property {boolean} json
+   */
+  export type FtaAnalysisOptions = {
+    /**
+     * Wether the result should be returned in a json or a pretty printed table.
+     *
+     * @type {boolean}
+     */
+    json: boolean;
+  };
+
+  /**
+   * Runs the FTA-Analysis for the given project.
+   *
+   * @param projectPath - The path to the root of the project to analyze
+   * @param options - The options for the analysis
+   */
+  export function runFta(
+    projectPath: string,
+    options: FtaAnalysisOptions
+  ): string;
+}
diff --git a/packages/fta/package.json b/packages/fta/package.json
index 1b77911..b983cf1 100644
--- a/packages/fta/package.json
+++ b/packages/fta/package.json
@@ -9,6 +9,7 @@
   "bin": {
     "fta": "index.js"
   },
+  "types": "@types/fta-cli.d.ts",
   "scripts": {
     "prepublishOnly": "node check.js"
   }