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packages/pyright-internal/jest.config.js

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+/*
+ * jest.config.js
+ *
+ * Configuration for jest tests.
+ */
+
+// When PYLANCE_JEST_TRANSPILE_ONLY=1 (set by pyrx CI), switch ts-jest into transpile-only
+// mode via `isolatedModules: true` (uses `tsc.transpileModule`, no type checking — much
+// faster). Tests are still type-checked by the dedicated `Typecheck` CI job. When unset
+// (default / local dev), ts-jest runs with full type-checking so type errors still surface.
+//
+// We intentionally stay on ts-jest in both modes so the emitted JS is byte-identical to the
+// local-dev configuration. Alternative transformers like @swc/jest can break edge cases the
+// rest of the test suite relies on (e.g. `jest.spyOn` on namespace exports — SWC emits
+// non-configurable getters — or `override readonly field!:` subclass fields, which SWC
+// re-defines after `super()` returns and so wipes the parent's assignment).
+const useTranspileOnly = process.env.PYLANCE_JEST_TRANSPILE_ONLY === '1';
+
+// In transpile-only mode we pass an inline compilerOptions object so we can force
+// `module: 'commonjs'`. The parent tsconfig chain sets `module: 'node16'`, which would
+// otherwise leave dynamic `import()` calls untransformed — those then require
+// `--experimental-vm-modules` under Jest. The set of options below mirrors the bits of
+// `tsconfig.jest.json` that matter for `tsc.transpileModule`.
+const transpileOnlyTsconfig = {
+    target: 'es2019',
+    module: 'commonjs',
+    moduleResolution: 'node',
+    esModuleInterop: true,
+    allowSyntheticDefaultImports: true,
+    experimentalDecorators: true,
+    resolveJsonModule: true,
+    isolatedModules: true,
+    preserveConstEnums: false,
+    baseUrl: '.',
+    paths: {
+        'vscode-languageserver': ['./node_modules/vscode-languageserver/lib/common/api'],
+        'vscode-languageserver/node': ['./node_modules/vscode-languageserver/lib/node/main'],
+        'vscode-languageserver-protocol': ['./node_modules/vscode-languageserver-protocol/lib/common/api'],
+        'vscode-languageserver-textdocument': ['./node_modules/vscode-languageserver-textdocument/lib/umd/main'],
+        'vscode-languageserver-types': ['./node_modules/vscode-languageserver-types/lib/umd/main'],
+        'vscode-jsonrpc': ['./node_modules/vscode-jsonrpc/lib/common/api'],
+        'vscode-jsonrpc/node': ['./node_modules/vscode-jsonrpc/lib/node/main'],
+    },
+};
+
+const transform = {
+    '^.+\\.tsx?$': [
+        'ts-jest',
+        useTranspileOnly
+            ? {
+                  tsconfig: transpileOnlyTsconfig,
+                  isolatedModules: true,
+                  diagnostics: false,
+              }
+            : {
+                  tsconfig: 'tsconfig.jest.json',
+                  diagnostics: {
+                      ignoreCodes: [151002],
+                  },
+              },
+    ],
+};
+
+module.exports = {
+    testEnvironment: 'node',
+    roots: ['<rootDir>/src/tests'],
+    transform,
+    // Place jest's transform cache inside node_modules so the existing node_modules CI cache
+    // preserves it across runs.
+    cacheDirectory: '<rootDir>/node_modules/.cache/jest',
+    testRegex: '(/__tests__/.*|(\\.|/)(test|spec))\\.tsx?$',
+    moduleFileExtensions: ['ts', 'tsx', 'js', 'jsx'],
+};