neaps · bkeepers · Jan 9, 2026 · Jan 9, 2026 · Jan 9, 2026
diff --git a/.github/dependabot.yml b/.github/dependabot.yml
@@ -1,12 +1,12 @@
 version: 2
 updates:
-  - package-ecosystem: 'npm'
-    directory: '/'
+  - package-ecosystem: "npm"
+    directory: "/"
     schedule:
-      interval: 'weekly'
+      interval: "weekly"
     open-pull-requests-limit: 100
-  - package-ecosystem: 'github-actions'
-    directory: '/'
+  - package-ecosystem: "github-actions"
+    directory: "/"
     schedule:
-      interval: 'weekly'
+      interval: "weekly"
     open-pull-requests-limit: 100
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
@@ -29,3 +29,20 @@ jobs:
 
       - name: Run tests
         run: npm run test
+
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v6
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v6
+        with:
+          node-version: "24"
+
+      - name: Install dependencies
+        run: npm install
+
+      - name: Run tests
+        run: npm run lint
diff --git a/.prettierignore b/.prettierignore
@@ -0,0 +1,2 @@
+data
+tmp
diff --git a/.prettierrc b/.prettierrc
diff --git a/README.md b/README.md
@@ -29,14 +29,14 @@ $ npm install @neaps/tide-database
 The package exports an array of all tide stations in the database:
 
 ```typescript
-import { constituents, stations } from '@neaps/tide-database';
+import { constituents, stations } from "@neaps/tide-database";
 
 // Constituents is an array of all harmonic constituents used in the database with a description and speed.
-console.log('Total constituents:', constituents.length);
+console.log("Total constituents:", constituents.length);
 console.log(constituents[0]);
 
 // Stations is an array of all the files in `data/`
-console.log('Total stations:', stations.length);
+console.log("Total stations:", stations.length);
 console.log(stations[0]);
 ```
 
@@ -61,6 +61,7 @@ Subordinate stations have four kinds of offsets, two to correct for water level,
 ## Maintenance
 
 A GitHub Action runs monthly on the 1st of each month to automatically update NOAA tide station data. The workflow:
+
 - Fetches the latest station list and harmonic constituents from NOAA's API
 - Updates existing station files with new data
 - Adds any newly discovered reference stations
@@ -80,19 +81,19 @@ This will scan all existing NOAA station files, fetch any new stations from NOAA
 
 Releases of this database use [Semantic Versioning](https://semver.org/), with these added semantics:
 
-* Major version changes indicate breaking changes to the data structure or APIs. However, as long as the version is "0.x", breaking changes may occur without a major version bump.
-* Minor version changes indicate backward-compatible additions to the data structure or APIs, such as new fields.
-* Patch version changes indicate updates to station data, and will always be the current date. For example, "0.1.20260101".
+- Major version changes indicate breaking changes to the data structure or APIs. However, as long as the version is "0.x", breaking changes may occur without a major version bump.
+- Minor version changes indicate backward-compatible additions to the data structure or APIs, such as new fields.
+- Patch version changes indicate updates to station data, and will always be the current date. For example, "0.1.20260101".
 
 ## Releasing
 
 Releases are created by [running the Publish action](https://github.com/neaps/tide-database/actions/workflows/publish.yml) on GitHub Actions. This action will use the major and minor `version` defined in `package.json`, and set the patch version to the current date.
 
 ## License
 
-* All code in this repository is licensed under the [MIT License](./LICENSE).
-* The `license` field of each station's JSON file specifies the license for that station.
-* Unless otherwise noted, All other data is licensed under the [Creative Commons Attribution 4.0 International (CC BY 4.0)](https://creativecommons.org/licenses/by/4.0/) license.
+- All code in this repository is licensed under the [MIT License](./LICENSE).
+- The `license` field of each station's JSON file specifies the license for that station.
+- Unless otherwise noted, All other data is licensed under the [Creative Commons Attribution 4.0 International (CC BY 4.0)](https://creativecommons.org/licenses/by/4.0/) license.
 
 If using this project, please attribute it as:
 

diff --git a/package.json b/package.json
@@ -31,7 +31,9 @@
   "scripts": {
     "build": "tsc -b && tsc -p tsconfig.node.json && tsdown",
     "prepare": "npm run build",
-    "test": "vitest"
+    "test": "vitest",
+    "lint": "prettier --check .",
+    "format": "prettier --write ."
   },
   "devDependencies": {
     "@neaps/tide-predictor": "^0.2.1",
@@ -43,6 +45,7 @@
     "geo-tz": "^8.1.4",
     "make-fetch-happen": "^15.0.3",
     "moment": "^2.30.1",
+    "prettier": "^3.7.4",
     "sort-object-keys": "^2.0.1",
     "tsdown": "^0.19.0-beta.3",
     "typescript": "^5.9.3",

diff --git a/schemas/station.schema.json b/schemas/station.schema.json
@@ -20,11 +20,7 @@
     "offsets": {
       "type": "object",
       "description": "Offsets for subordinate stations relative to a reference station",
-      "required": [
-        "reference",
-        "height",
-        "time"
-      ],
+      "required": ["reference", "height", "time"],
       "additionalProperties": false,
       "properties": {
         "reference": {
@@ -34,11 +30,7 @@
         "height": {
           "type": "object",
           "description": "Defines the values to add or multiply with water levels (depending on type)",
-          "required": [
-            "high",
-            "low",
-            "type"
-          ],
+          "required": ["high", "low", "type"],
           "additionalProperties": false,
           "properties": {
             "high": {
@@ -50,20 +42,14 @@
               "description": "Height offset/multiplier for low tide - if type is 'ratio', this is a multiplier; if 'fixed', this is an offset to add (can be negative)"
             },
             "type": {
-              "enum": [
-                "ratio",
-                "fixed"
-              ]
+              "enum": ["ratio", "fixed"]
             }
           }
         },
         "time": {
           "type": "object",
           "description": "Defines the time to add to when a high or low tide will occur",
-          "required": [
-            "high",
-            "low"
-          ],
+          "required": ["high", "low"],
           "additionalProperties": false,
           "properties": {
             "high": {
@@ -83,10 +69,7 @@
     "id": {
       "type": "string",
       "description": "Unique station ID for this database only, in the format of `country/region/station-name`.",
-      "examples": [
-        "us-ma-boston",
-        "ar-u-puerto-madryn"
-      ],
+      "examples": ["us-ma-boston", "ar-u-puerto-madryn"],
       "minLength": 4
     },
     "name": {
@@ -117,10 +100,7 @@
     },
     "type": {
       "type": "string",
-      "enum": [
-        "reference",
-        "subordinate"
-      ]
+      "enum": ["reference", "subordinate"]
     },
     "latitude": {
       "type": "number",
@@ -133,23 +113,15 @@
     "source": {
       "type": "object",
       "description": "",
-      "required": [
-        "name",
-        "id",
-        "published_harmonics",
-        "url"
-      ],
+      "required": ["name", "id", "published_harmonics", "url"],
       "additionalProperties": true,
       "properties": {
         "name": {
           "type": "string",
           "name": "Name of the source, i.e. `NOAA`"
         },
         "id": {
-          "type": [
-            "string",
-            "number"
-          ],
+          "type": ["string", "number"],
           "description": "The identifier used by the source for this station."
         },
         "published_harmonics": {
@@ -166,11 +138,7 @@
     "license": {
       "type": "object",
       "description": "Defines the license and whatever restrictions are placed on use of the data.",
-      "required": [
-        "type",
-        "commercial_use",
-        "url"
-      ],
+      "required": ["type", "commercial_use", "url"],
       "additionalProperties": true,
       "properties": {
         "type": {
@@ -196,23 +164,15 @@
       "type": "array",
       "items": {
         "type": "object",
-        "required": [
-          "name",
-          "amplitude",
-          "phase"
-        ],
+        "required": ["name", "amplitude", "phase"],
         "additionalProperties": false,
         "properties": {
           "name": {
             "type": "string",
             "description": "Harmonic Constituent code (i.e. M2) - should be upper-case"
           },
           "description": {
-            "type": [
-              "string",
-              "number",
-              "null"
-            ],
+            "type": ["string", "number", "null"],
             "description": "Human-friendly description of the constituent"
           },
           "amplitude": {

diff --git a/src/index.ts b/src/index.ts
@@ -1,63 +1,63 @@
-import _constituents from './constituents.json' with { type: 'json' }
+import _constituents from "./constituents.json" with { type: "json" };
 
 export interface HarmonicConstituent {
-  name: string
-  description?: string
-  amplitude: number
-  phase: number
-  speed?: number
+  name: string;
+  description?: string;
+  amplitude: number;
+  phase: number;
+  speed?: number;
 }
 
 export interface Constituent {
-  name: string
-  description: string | null
-  speed: number
+  name: string;
+  description: string | null;
+  speed: number;
 }
 
 export interface Station {
   // Basic station information
-  id: string
-  name: string
-  continent: string
-  country: string
-  region?: string
-  timezone: string
-  disclaimers: string
-  type: 'reference' | 'subordinate'
-  latitude: number
-  longitude: number
+  id: string;
+  name: string;
+  continent: string;
+  country: string;
+  region?: string;
+  timezone: string;
+  disclaimers: string;
+  type: "reference" | "subordinate";
+  latitude: number;
+  longitude: number;
 
   // Data source information
   source: {
-    name: string
-    id: string
-    published_harmonics: boolean
-    url: string
-  }
+    name: string;
+    id: string;
+    published_harmonics: boolean;
+    url: string;
+  };
 
   // License information
   license: {
-    type: string
-    commercial_use: boolean
-    url: string
-    notes?: string
-  }
+    type: string;
+    commercial_use: boolean;
+    url: string;
+    notes?: string;
+  };
 
   // Harmonic constituents (empty array for subordinate stations)
-  harmonic_constituents: HarmonicConstituent[]
+  harmonic_constituents: HarmonicConstituent[];
 
   // Subordinate station offsets (empty object for reference stations)
   offsets?: {
-    reference: string
-    height: { high: number; low: number; type: 'ratio' | 'fixed' }
-    time: { high: number; low: number }
-  }
+    reference: string;
+    height: { high: number; low: number; type: "ratio" | "fixed" };
+    time: { high: number; low: number };
+  };
 
-  datums: Record<string, number>
+  datums: Record<string, number>;
 }
 
-export const constituents: Constituent[] = _constituents
+export const constituents: Constituent[] = _constituents;
 
 export const stations: Station[] = Object.values(
-  import.meta.glob('../data/**/*.json', { eager: true, import: 'default' })
-)
+  import.meta.glob("../data/**/*.json", { eager: true, import: "default" }),
+);