feat: add duplicate keys rule (#179)

* feat: add duplicate keys rule

* test names

* update README.md

* fix main

* test

* chore: comitting generated dist

* fix

* chore: comitting generated dist

---------

Co-authored-by: danadajian <danadajian@users.noreply.github.com>

Author: danadajian

.github/workflows/test.yaml

@@ -58,3 +58,5 @@ jobs:
           rules: |
             ranges
             tags
+            resolutions
+            keys

README.md

@@ -4,7 +4,7 @@
 
 A Github Action for validating package.json conventions.
 
-## Usage
+## Rules
 
 Use the `rules` input to specify one or more rules you would like to check for your `package.json`.
 
@@ -16,7 +16,7 @@ The following usage would allow `"my-package": "1.2.3"` but prevent `"my-package
 ```yaml
 steps:
   - name: Checkout
-    uses: actions/checkout@v2
+    uses: actions/checkout@v3
 
   - uses: ExpediaGroup/package-json-validator@v1
     with:
@@ -27,7 +27,7 @@ You can also specify `allowed-ranges`. The following would allow `"my-package":
 ```yaml
 steps:
   - name: Checkout
-    uses: actions/checkout@v2
+    uses: actions/checkout@v3
 
   - uses: ExpediaGroup/package-json-validator@v1
     with:
@@ -43,7 +43,7 @@ The following usage would allow `"my-package": "1.2.3"` but prevent `"my-package
 ```yaml
 steps:
   - name: Checkout
-    uses: actions/checkout@v2
+    uses: actions/checkout@v3
 
   - uses: ExpediaGroup/package-json-validator@v1
     with:
@@ -55,19 +55,57 @@ The following usage would allow `"my-package": "1.2.3-canary.456.0"` but prevent
 ```yaml
 steps:
   - name: Checkout
-    uses: actions/checkout@v2
+    uses: actions/checkout@v3
 
   - uses: ExpediaGroup/package-json-validator@v1
     with:
       rules: tags
       allowed-tags: canary
 ```
 
+### Resolutions
+The "resolutions" rule validates that your package.json does not contain the `resolutions` option.
+
+```yaml
+steps:
+- name: Checkout
+  uses: actions/checkout@v3
+
+- uses: ExpediaGroup/package-json-validator@v1
+  with:
+  rules: resolutions
+```
+
+### Keys
+The "keys" rule validates that your package.json does not contain duplicate dependency keys.
+
+```yaml
+steps:
+- name: Checkout
+  uses: actions/checkout@v3
+
+- uses: ExpediaGroup/package-json-validator@v1
+  with:
+  rules: keys
+```
+
+Example invalid package.json this will prevent:
+```json
+{
+  "dependencies": {
+    "some-dependency": "1.0.0",
+    "some-dependency": "2.0.0"
+  }
+}
+```
+
+## Other Inputs
+
 Specify `dependency-types` to denote which type of package.json dependencies you wish to validate. Valid options include `dependencies`, `devDependencies`, `peerDependencies`, and `optionalDependencies`. Defaults to `dependencies`.
 ```yaml
 steps:
   - name: Checkout
-    uses: actions/checkout@v2
+    uses: actions/checkout@v3
 
   - uses: ExpediaGroup/package-json-validator@v1
     with:
@@ -79,7 +117,7 @@ Specify `ignore-packages` to skip validation entirely for certain packages. Opti
 ```yaml
 steps:
   - name: Checkout
-    uses: actions/checkout@v2
+    uses: actions/checkout@v3
 
   - uses: ExpediaGroup/package-json-validator@v1
     with:
@@ -92,7 +130,7 @@ You may also enforce multiple rules (and pass additional inputs) like this:
 ```yaml
 steps:
   - name: Checkout
-    uses: actions/checkout@v2
+    uses: actions/checkout@v3
 
   - uses: ExpediaGroup/package-json-validator@v1
     with:

dist/index.js

@@ -17,39 +17,46 @@ import { readFileSync } from 'fs';
 import { validateVersionRanges } from './rules/ranges';
 import { validateVersionTags } from './rules/tags';
 import { validateResolutions } from './rules/resolutions';
+import { validateKeys } from './rules/keys';
 
 type GithubError = {
   status: number;
   message: string;
 };
 
+const pathToPackageJson = './package.json';
+
 export const RULES_MAP: {
   [key: string]: {
     method: Function;
-    extraInputName?: string;
+    extraInput?: string;
   };
 } = {
   ranges: {
     method: validateVersionRanges,
-    extraInputName: 'allowed-ranges'
+    extraInput: 'allowed-ranges'
   },
   tags: {
     method: validateVersionTags,
-    extraInputName: 'allowed-tags'
+    extraInput: 'allowed-tags'
   },
   resolutions: {
     method: validateResolutions
+  },
+  keys: {
+    method: validateKeys,
+    extraInput: pathToPackageJson
   }
 };
 
 export const run = () => {
   try {
-    const packageJson: PackageJson = JSON.parse(readFileSync('./package.json').toString());
+    const packageJson: PackageJson = JSON.parse(readFileSync(pathToPackageJson).toString());
 
     const rules = core.getMultilineInput('rules', { required: true });
     rules.forEach(rule => {
-      const { method, extraInputName } = RULES_MAP[rule];
-      method(packageJson, extraInputName);
+      const { method, extraInput } = RULES_MAP[rule];
+      method(packageJson, extraInput);
     });
   } catch (error) {
     core.setFailed((error as GithubError).message);

dist/index.js.map

@@ -0,0 +1,28 @@
+/*
+Copyright 2021 Expedia, Inc.
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+    https://www.apache.org/licenses/LICENSE-2.0
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import * as core from '@actions/core';
+import { readFileSync } from 'fs';
+import { PackageJson } from 'type-fest';
+import { getDependencies } from '../utils/get-dependencies';
+
+export const validateKeys = (packageJson: PackageJson, packageJsonPath: string) => {
+  const dependencies = getDependencies(packageJson);
+  Object.keys(dependencies).forEach(dependency => {
+    const stringifiedPackageJson = readFileSync(packageJsonPath).toString();
+    const regexMatches = stringifiedPackageJson.match(new RegExp(dependency, 'g'));
+    if (regexMatches && regexMatches.length > 1) {
+      core.setFailed(`Duplicate keys found in package.json: ${regexMatches}`);
+    }
+  });
+};

src/main.ts

@@ -17,7 +17,7 @@ import { PackageJson } from 'type-fest';
 export const validateResolutions = (packageJson: PackageJson) => {
   if (packageJson.resolutions) {
     core.setFailed(
-      'Resolutions may not be set. Please investigate the root cause your dependency issues!'
+      'Resolutions may not be set. Please investigate the root cause of your dependency issues!'
     );
   }
 };

src/rules/keys.ts

@@ -0,0 +1,9 @@
+{
+  "dependencies": {
+    "some-dependency": "1.0.0",
+    "some-other-dependency": "2.0.0"
+  },
+  "devDependencies": {
+    "some-dev-dependency": "2.0.0"
+  }
+}

src/rules/resolutions.ts

@@ -0,0 +1,6 @@
+{
+  "dependencies": {
+    "some-dependency": "1.0.0",
+    "some-dependency": "2.0.0"
+  }
+}

test/fixtures/deduped-package.json

@@ -0,0 +1,9 @@
+{
+  "dependencies": {
+    "some-dependency": "1.0.0",
+    "some-other-dependency": "2.0.0"
+  },
+  "devDependencies": {
+    "some-dependency": "2.0.0"
+  }
+}