chore: enable rewriteRelativeImportExtensions in local rigs and enforce import/extensions ESLint rule

Author: iclanton

rigs/decoupled-local-node-rig/profiles/default/includes/eslint/flat/profile/_common.js

@@ -63,6 +63,11 @@ module.exports = {
         // module that is not available once the package is published.
         'import/no-extraneous-dependencies': ['error', { devDependencies: true, peerDependencies: true }],
 
+        // Rationale: Relative imports must include the .ts/.tsx file extension so that
+        // TypeScript's rewriteRelativeImportExtensions can produce correct .js extensions
+        // in the compiled output. This is required for proper ESM resolution in Node.js.
+        'import/extensions': ['error', 'ignorePackages'],
+
         // Rationale: Use of `== null` comparisons is common-place
         eqeqeq: ['error', 'always', { null: 'ignore' }],
 

rigs/decoupled-local-node-rig/profiles/default/tsconfig-base.json

@@ -7,6 +7,7 @@
     "resolveJsonModule": true,
     "isolatedModules": true,
     "target": "es2018",
+    "rewriteRelativeImportExtensions": true,
 
     "outDir": "${configDir}/lib-commonjs",
     "declarationDir": "${configDir}/lib-dts",

rigs/local-node-rig/profiles/default/tsconfig-base.json

@@ -7,6 +7,7 @@
     "resolveJsonModule": true,
     "isolatedModules": true,
     "target": "es2018",
+    "rewriteRelativeImportExtensions": true,
 
     "outDir": "${configDir}/lib-commonjs",
     "declarationDir": "${configDir}/lib-dts",