fix(linter): update the @nx/dependency-checks rule to read the package.json content from the rule context (#27476)

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## Current Behavior
<!-- This is the behavior we have today -->

The `@nx/dependency-checks` rule sometimes doesn't apply all identified
fixes and wrongly succeeds. ESLint performs multiple passes to try to
apply fixes, and in each pass the rule receives the updated source code
with the previously applied fixes. This allows merging different fixes,
but the `@nx/dependency-checks` rule always reads the `package.json`
file from the filesystem, caches it globally, and mutates it. It never
uses the updated source code provided in the rule context.

## Expected Behavior
<!-- This is the behavior we should expect with the changes in this PR
-->

The `@nx/dependency-checks` rule should apply all identified fixes [as
long as they don't
conflict](https://eslint.org/docs/latest/extend/custom-rules#conflicting-fixes).

## Related Issue(s)
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merged. -->

Fixes #27412

e2e/eslint/src/linter.test.ts

@@ -478,13 +478,21 @@ describe('Linter', () => {
             `import { names } from '@nx/devkit';\n\n` +
             content.replace(/=> .*;/, `=> names('${mylib}').className;`)
         );
+        // intentionally set an obsolete dependency
+        updateJson(`libs/${mylib}/package.json`, (json) => {
+          json.dependencies['@nx/js'] = nxVersion;
+          return json;
+        });
 
-        // output should now report missing dependency
+        // output should now report missing dependency and obsolete dependency
         out = runCLI(`lint ${mylib}`, { silenceError: true });
         expect(out).toContain('they are missing');
         expect(out).toContain('@nx/devkit');
+        expect(out).toContain(
+          `The "@nx/js" package is not used by "${mylib}" project`
+        );
 
-        // should fix the missing dependency issue
+        // should fix the missing and obsolete dependency issues
         out = runCLI(`lint ${mylib} --fix`, { silenceError: true });
         expect(out).toContain(
           `Successfully ran target lint for project ${mylib}`

packages/eslint-plugin/src/rules/dependency-checks.ts

@@ -152,14 +152,9 @@ export default ESLintUtils.RuleCreator(
     );
     const expectedDependencyNames = Object.keys(npmDependencies);
 
-    const projPackageJsonPath = join(
-      workspaceRoot,
-      sourceProject.data.root,
-      'package.json'
-    );
+    const packageJson = JSON.parse(context.sourceCode.getText());
+    const projPackageJsonDeps = getProductionDependencies(packageJson);
 
-    const projPackageJsonDeps: Record<string, string> =
-      getProductionDependencies(projPackageJsonPath);
     const rootPackageJsonDeps = getAllDependencies(rootPackageJson);
 
     function validateMissingDependencies(node: AST.JSONProperty) {

packages/eslint-plugin/src/utils/package-json-utils.ts

@@ -1,7 +1,6 @@
 import { readJsonFile } from '@nx/devkit';
 import { existsSync } from 'fs';
-import { PackageJson } from 'nx/src/utils/package-json';
-import { isTerminalRun } from './runtime-lint-utils';
+import type { PackageJson } from 'nx/src/utils/package-json';
 
 export function getAllDependencies(
   packageJson: PackageJson
@@ -15,23 +14,13 @@ export function getAllDependencies(
 }
 
 export function getProductionDependencies(
-  packageJsonPath: string
+  packageJson: PackageJson
 ): Record<string, string> {
-  if (
-    !globalThis.projPackageJsonDeps ||
-    !globalThis.projPackageJsonDeps[packageJsonPath] ||
-    !isTerminalRun()
-  ) {
-    const packageJson = getPackageJson(packageJsonPath);
-    globalThis.projPackageJsonDeps = globalThis.projPackageJsonDeps || {};
-    globalThis.projPackageJsonDeps[packageJsonPath] = {
-      ...packageJson.dependencies,
-      ...packageJson.peerDependencies,
-      ...packageJson.optionalDependencies,
-    };
-  }
-
-  return globalThis.projPackageJsonDeps[packageJsonPath];
+  return {
+    ...packageJson.dependencies,
+    ...packageJson.peerDependencies,
+    ...packageJson.optionalDependencies,
+  };
 }
 
 export function getPackageJson(path: string): PackageJson {