fix(compiler): get to handle .cts files

src/compiler/bundle/bundle-output.ts

@@ -62,7 +62,7 @@ export const getRollupOptions = (
     browser: true,
     rootDir: config.rootDir,
     ...(config.nodeResolve as any),
-    extensions: ['.tsx', '.ts', '.js', '.mjs', '.json', '.d.ts', '.d.mts'],
+    extensions: ['.tsx', '.ts', '.mts', '.cts', '.js', '.mjs', '.cjs', '.json', '.d.ts', '.d.mts', '.d.cts'],
   });
 
   // @ts-expect-error - this is required now.

src/compiler/bundle/file-load-plugin.ts

@@ -1,4 +1,4 @@
-import { normalizeFsPath } from '@utils';
+import { isDtsFile, normalizeFsPath } from '@utils';
 import type { Plugin } from 'rollup';
 
 import { InMemoryFileSystem } from '../sys/in-memory-fs';
@@ -9,7 +9,7 @@ export const fileLoadPlugin = (fs: InMemoryFileSystem): Plugin => {
 
     load(id) {
       const fsFilePath = normalizeFsPath(id);
-      if (id.endsWith('.d.ts') || id.endsWith('.d.mts')) {
+      if (isDtsFile(fsFilePath)) {
         return '';
       }
       return fs.readFile(fsFilePath);

src/compiler/bundle/typescript-plugin.ts

@@ -1,4 +1,4 @@
-import { isString, normalizeFsPath } from '@utils';
+import { isDtsFile, isString, normalizeFsPath } from '@utils';
 import { basename, isAbsolute } from 'path';
 import type { LoadResult, Plugin, TransformResult } from 'rollup';
 import ts from 'typescript';
@@ -88,7 +88,7 @@ export const resolveIdWithTypeScript = (config: d.ValidatedConfig, compilerCtx:
         // this is probably a .d.ts file for whatever reason in how TS resolves this
         // use this resolved file as the "importer"
         const tsResolvedPath = tsResolved.resolvedModule.resolvedFileName;
-        if (isString(tsResolvedPath) && !(tsResolvedPath.endsWith('.d.ts') || tsResolvedPath.endsWith('.d.mts'))) {
+        if (isString(tsResolvedPath) && !isDtsFile(tsResolvedPath)) {
           return tsResolvedPath;
         }
       }

src/compiler/sys/fetch/fetch-utils.ts

@@ -1,7 +1,7 @@
-import { isFunction, normalizePath } from '@utils';
+import { isFunction, isTsFile, isTsxFile, normalizePath } from '@utils';
 
 import type * as d from '../../../declarations';
-import { isCommonDirModuleFile, isTsFile, isTsxFile } from '../resolve/resolve-utils';
+import { isCommonDirModuleFile } from '../resolve/resolve-utils';
 
 /**
  * A fetch wrapper which dispatches to `sys.fetch` if present, and otherwise

src/compiler/sys/resolve/resolve-utils.ts

@@ -2,43 +2,7 @@ import { normalizePath } from '@utils';
 
 import type * as d from '../../../declarations';
 
-const COMMON_DIR_MODULE_EXTS = ['.tsx', '.ts', '.mjs', '.js', '.jsx', '.json', '.md'];
-
-/**
- * Determine if a stringified file path is a TypeScript declaration file based on the extension at the end of the path.
- * @param p the path to evaluate
- * @returns `true` if the path ends in `.d.ts` (case-sensitive), `false` otherwise.
- */
-export const isDtsFile = (p: string) => p.endsWith('.d.ts') || p.endsWith('.d.mts');
-
-/**
- * Determine if a stringified file path is a TypeScript file based on the extension at the end of the path. This
- * function does _not_ consider type declaration files (`.d.ts` files) to be TypeScript files.
- * @param p the path to evaluate
- * @returns `true` if the path ends in `.ts` (case-sensitive) but does _not_ end in `.d.ts`, `false` otherwise.
- */
-export const isTsFile = (p: string) => !isDtsFile(p) && p.endsWith('.ts');
-
-/**
- * Determine if a stringified file path is a TSX file based on the extension at the end of the path
- * @param p the path to evaluate
- * @returns `true` if the path ends in `.tsx` (case-sensitive), `false` otherwise.
- */
-export const isTsxFile = (p: string) => p.endsWith('.tsx');
-
-/**
- * Determine if a stringified file path is a JSX file based on the extension at the end of the path
- * @param p the path to evaluate
- * @returns `true` if the path ends in `.jsx` (case-sensitive), `false` otherwise.
- */
-export const isJsxFile = (p: string) => p.endsWith('.jsx');
-
-/**
- * Determine if a stringified file path is a JavaScript file based on the extension at the end of the path
- * @param p the path to evaluate
- * @returns `true` if the path ends in `.js` (case-sensitive), `false` otherwise.
- */
-export const isJsFile = (p: string) => p.endsWith('.js');
+const COMMON_DIR_MODULE_EXTS = ['.tsx', '.ts', '.mts', '.cts', '.mjs', '.js', '.cjs', '.jsx', '.json', '.md'];
 
 export const isCommonDirModuleFile = (p: string) => COMMON_DIR_MODULE_EXTS.some((ext) => p.endsWith(ext));
 

src/compiler/sys/typescript/typescript-resolve-module.ts

@@ -1,9 +1,8 @@
-import { isString, join, normalizePath, resolve } from '@utils';
+import { isDtsFile, isJsFile, isJsxFile, isString, isTsFile, isTsxFile, join, normalizePath, resolve } from '@utils';
 import { basename, dirname } from 'path';
 import ts from 'typescript';
 
 import type * as d from '../../../declarations';
-import { isDtsFile, isJsFile, isJsxFile, isTsFile, isTsxFile } from '../resolve/resolve-utils';
 import { patchTsSystemFileSystem } from './typescript-sys';
 
 export const tsResolveModuleName = (

src/utils/test/util.spec.ts

@@ -234,4 +234,68 @@ interface Foo extends Components.Foo, HTMLStencilElement {`);
       },
     );
   });
+
+  describe('isTsFile', () => {
+    it.each(['.ts', 'foo.ts', 'foo.bar.ts', 'foo/bar.ts'])(
+      'returns true for a file ending with .ts (%s)',
+      (fileName) => {
+        expect(util.isTsFile(fileName)).toEqual(true);
+      },
+    );
+
+    it.each(['.tsx', 'foo.tsx', 'foo.bar.tsx', 'foo/bar.tsx'])(
+      'returns false for a file ending with .tsx (%s)',
+      (fileName) => {
+        expect(util.isTsFile(fileName)).toEqual(false);
+      },
+    );
+
+    it.each(['foo.js', 'foo.doc', 'foo.css', 'foo.html'])(
+      'returns false for other a file with another extension (%s)',
+      (fileName) => {
+        expect(util.isTsFile(fileName)).toEqual(false);
+      },
+    );
+
+    it('returns false for .d.ts and .d.tsx files', () => {
+      expect(util.isTsFile('foo/bar.d.ts')).toEqual(false);
+      expect(util.isTsFile('foo/bar.d.tsx')).toEqual(false);
+    });
+
+    it('returns true for a file named "spec.ts"', () => {
+      expect(util.isTsFile('spec.ts')).toEqual(true);
+    });
+
+    it('returns true for a file named "d.ts"', () => {
+      expect(util.isTsFile('d.ts')).toEqual(true);
+    });
+
+    it.each(['foo.tS', 'foo.Ts', 'foo.TS'])('returns true for non-lowercase extensions (%s)', (fileName) => {
+      expect(util.isTsFile(fileName)).toEqual(true);
+    });
+  });
+
+  describe('isJsFile', () => {
+    it.each(['.js', 'foo.js', 'foo.bar.js', 'foo/bar.js'])(
+      'returns true for a file ending with .js (%s)',
+      (fileName) => {
+        expect(util.isJsFile(fileName)).toEqual(true);
+      },
+    );
+
+    it.each(['.jsx', 'foo.txt', 'foo/bar.css', 'foo.bar.html'])(
+      'returns false for other a file with another extension (%s)',
+      (fileName) => {
+        expect(util.isJsFile(fileName)).toEqual(false);
+      },
+    );
+
+    it('returns true for a file named "spec.js"', () => {
+      expect(util.isJsFile('spec.js')).toEqual(true);
+    });
+
+    it.each(['foo.jS', 'foo.Js', 'foo.JS'])('returns true for non-lowercase extensions (%s)', (fileName) => {
+      expect(util.isJsFile(fileName)).toEqual(true);
+    });
+  });
 });

src/utils/util.ts

@@ -42,18 +42,53 @@ export const createJsVarName = (fileName: string): string => {
 };
 
 /**
- * Determines if a given file path points to a type declaration file (ending in .d.ts) or not. This function is
- * case-insensitive in its heuristics.
- * @param filePath the path to check
- * @returns `true` if the given `filePath` points to a type declaration file, `false` otherwise
- */
-export const isDtsFile = (filePath: string): boolean => {
-  const parts = filePath.toLowerCase().split('.');
-  if (parts.length > 2) {
-    return parts[parts.length - 2] === 'd' && parts[parts.length - 1] === 'ts';
-  }
-  return false;
-};
+ * Create a function that lowercases the first string parameter before passing it to the provided function
+ * @param fn the function to pass the lowercased path to
+ * @returns the result of the provided function
+ */
+const lowerPathParam = (fn: (p: string) => boolean) => (p: string) => fn(p.toLowerCase());
+
+/**
+ * Determine if a stringified file path is a TypeScript declaration file based on the extension at the end of the path.
+ * @param p the path to evaluate
+ * @returns `true` if the path ends in `.d.ts` (case-sensitive), `false` otherwise.
+ */
+export const isDtsFile = lowerPathParam((p) => p.endsWith('.d.ts') || p.endsWith('.d.mts') || p.endsWith('.d.cts'));
+
+/**
+ * Determine if a stringified file path is a TypeScript file based on the extension at the end of the path. This
+ * function does _not_ consider type declaration files (`.d.ts` files) to be TypeScript files.
+ * @param p the path to evaluate
+ * @returns `true` if the path ends in `.ts` (case-sensitive) but does _not_ end in `.d.ts`, `false` otherwise.
+ */
+export const isTsFile = lowerPathParam(
+  (p: string) => !isDtsFile(p) && (p.endsWith('.ts') || p.endsWith('.mts') || p.endsWith('.cts')),
+);
+
+/**
+ * Determine if a stringified file path is a TSX file based on the extension at the end of the path
+ * @param p the path to evaluate
+ * @returns `true` if the path ends in `.tsx` (case-sensitive), `false` otherwise.
+ */
+export const isTsxFile = lowerPathParam(
+  (p: string) => p.endsWith('.tsx') || p.endsWith('.mtsx') || p.endsWith('.ctsx'),
+);
+
+/**
+ * Determine if a stringified file path is a JSX file based on the extension at the end of the path
+ * @param p the path to evaluate
+ * @returns `true` if the path ends in `.jsx` (case-sensitive), `false` otherwise.
+ */
+export const isJsxFile = lowerPathParam(
+  (p: string) => p.endsWith('.jsx') || p.endsWith('.mjsx') || p.endsWith('.cjsx'),
+);
+
+/**
+ * Determine if a stringified file path is a JavaScript file based on the extension at the end of the path
+ * @param p the path to evaluate
+ * @returns `true` if the path ends in `.js` (case-sensitive), `false` otherwise.
+ */
+export const isJsFile = lowerPathParam((p: string) => p.endsWith('.js') || p.endsWith('.mjs') || p.endsWith('.cjs'));
 
 /**
  * Generate the preamble to be placed atop the main file of the build