fix(migrations): correctly strip away parameters surrounded by comments in inject migration (#58959)

Fixes that the inject migration was sometimes producing invalid code if there are comments around the parameters.

PR Close #58959

Author: crisbeto

packages/core/schematics/ng-generate/inject-migration/migration.ts

@@ -586,37 +586,25 @@ function stripConstructorParameters(node: ts.ConstructorDeclaration, tracker: Ch
   const constructorText = node.getText();
   const lastParamText = node.parameters[node.parameters.length - 1].getText();
   const lastParamStart = constructorText.indexOf(lastParamText);
-  const whitespacePattern = /\s/;
-  let trailingCharacters = 0;
 
-  if (lastParamStart > -1) {
-    let lastParamEnd = lastParamStart + lastParamText.length;
-    let closeParenIndex = -1;
+  // This shouldn't happen, but bail out just in case so we don't mangle the code.
+  if (lastParamStart === -1) {
+    return;
+  }
 
-    for (let i = lastParamEnd; i < constructorText.length; i++) {
-      const char = constructorText[i];
+  for (let i = lastParamStart + lastParamText.length; i < constructorText.length; i++) {
+    const char = constructorText[i];
 
-      if (char === ')') {
-        closeParenIndex = i;
-        break;
-      } else if (!whitespacePattern.test(char)) {
-        // The end of the last parameter won't include
-        // any trailing commas which we need to account for.
-        lastParamEnd = i + 1;
-      }
-    }
-
-    if (closeParenIndex > -1) {
-      trailingCharacters = closeParenIndex - lastParamEnd;
+    if (char === ')') {
+      tracker.replaceText(
+        node.getSourceFile(),
+        node.parameters.pos,
+        node.getStart() + i - node.parameters.pos,
+        '',
+      );
+      break;
     }
   }
-
-  tracker.replaceText(
-    node.getSourceFile(),
-    node.parameters.pos,
-    node.parameters.end - node.parameters.pos + trailingCharacters,
-    '',
-  );
 }
 
 /**

packages/core/schematics/test/inject_migration_spec.ts

@@ -1644,6 +1644,46 @@ describe('inject migration', () => {
     ]);
   });
 
+  it('should handle removing parameters surrounded by comments', async () => {
+    writeFile(
+      '/dir.ts',
+      [
+        `import { Directive } from '@angular/core';`,
+        `import { Foo } from 'foo';`,
+        `import { Bar } from 'bar';`,
+        ``,
+        `@Directive()`,
+        `class MyClass {`,
+        `  constructor(`,
+        `     // start`,
+        `     private foo: Foo,`,
+        `     readonly bar: Bar, // end`,
+        `  ) {`,
+        `    console.log(this.bar);`,
+        `  }`,
+        `}`,
+      ].join('\n'),
+    );
+
+    await runMigration();
+
+    expect(tree.readContent('/dir.ts').split('\n')).toEqual([
+      `import { Directive, inject } from '@angular/core';`,
+      `import { Foo } from 'foo';`,
+      `import { Bar } from 'bar';`,
+      ``,
+      `@Directive()`,
+      `class MyClass {`,
+      `  private foo = inject(Foo);`,
+      `  readonly bar = inject(Bar);`,
+      ``,
+      `  constructor() {`,
+      `    console.log(this.bar);`,
+      `  }`,
+      `}`,
+    ]);
+  });
+
   describe('internal-only behavior', () => {
     function runInternalMigration() {
       return runMigration({_internalCombineMemberInitializers: true});