vendor tsgo

tools/tsgo/internal/fourslash/tests/goToSourceDefinitionPropertyAccessNoDecl_test.go

@@ -0,0 +1,75 @@
+package fourslash_test
+
+import (
+	"testing"
+
+	"github.com/microsoft/typescript-go/internal/fourslash"
+	"github.com/microsoft/typescript-go/internal/testutil"
+)
+
+func TestGoToSourcePropertyAccessNoDeclaration(t *testing.T) {
+	t.Parallel()
+	defer testutil.RecoverAndFail(t, "Panic on fourslash test")
+	// When a property exists only via a mapped type in the .d.ts, the checker
+	// returns no declarations. The source definition resolver should still
+	// navigate to the property in the .js file by finding the module specifier
+	// from the parent expression's import declaration.
+	const content = `// @moduleResolution: bundler
+// @Filename: /home/src/workspaces/project/node_modules/pkg/package.json
+{ "name": "pkg", "main": "./index.js", "types": "./index.d.ts" }
+// @Filename: /home/src/workspaces/project/node_modules/pkg/index.d.ts
+type Keys = "alpha" | "beta";
+export declare const config: { [K in Keys]: string };
+// @Filename: /home/src/workspaces/project/node_modules/pkg/index.js
+export const config = { /*targetAlpha*/alpha: "a", /*targetBeta*/beta: "b" };
+// @Filename: /home/src/workspaces/project/index.ts
+import { config } from "pkg";
+config./*accessAlpha*/alpha;
+config./*accessBeta*/beta;`
+	f, done := fourslash.NewFourslash(t, nil /*capabilities*/, content)
+	defer done()
+	f.VerifyBaselineGoToSourceDefinition(t, "accessAlpha", "accessBeta")
+}
+
+func TestGoToSourcePropertyAccessDeepChain(t *testing.T) {
+	t.Parallel()
+	defer testutil.RecoverAndFail(t, "Panic on fourslash test")
+	// Deep property access chain: import * as ns; ns.obj.prop
+	// where the intermediate object has no declaration but the root
+	// identifier can be traced back to its import.
+	const content = `// @moduleResolution: bundler
+// @Filename: /home/src/workspaces/project/node_modules/pkg/package.json
+{ "name": "pkg", "main": "./index.js", "types": "./index.d.ts" }
+// @Filename: /home/src/workspaces/project/node_modules/pkg/index.d.ts
+export declare const nested: { inner: { value: number } };
+// @Filename: /home/src/workspaces/project/node_modules/pkg/index.js
+export const nested = { inner: { /*targetValue*/value: 42 } };
+// @Filename: /home/src/workspaces/project/index.ts
+import { nested } from "pkg";
+nested.inner./*accessValue*/value;`
+	f, done := fourslash.NewFourslash(t, nil /*capabilities*/, content)
+	defer done()
+	f.VerifyBaselineGoToSourceDefinition(t, "accessValue")
+}
+
+func TestGoToSourcePropertyAccessNamespaceImport(t *testing.T) {
+	t.Parallel()
+	defer testutil.RecoverAndFail(t, "Panic on fourslash test")
+	// import * as ns from "pkg"; ns.thing — where "thing" has no declarations
+	// from the checker (e.g. module augmentation or dynamic).
+	const content = `// @moduleResolution: bundler
+// @Filename: /home/src/workspaces/project/node_modules/pkg/package.json
+{ "name": "pkg", "main": "./index.js", "types": "./index.d.ts" }
+// @Filename: /home/src/workspaces/project/node_modules/pkg/index.d.ts
+type Keys = "x" | "y";
+export declare const coords: { [K in Keys]: number };
+// @Filename: /home/src/workspaces/project/node_modules/pkg/index.js
+export const coords = { /*targetX*/x: 10, /*targetY*/y: 20 };
+// @Filename: /home/src/workspaces/project/index.ts
+import { coords } from "pkg";
+coords./*accessX*/x;
+coords./*accessY*/y;`
+	f, done := fourslash.NewFourslash(t, nil /*capabilities*/, content)
+	defer done()
+	f.VerifyBaselineGoToSourceDefinition(t, "accessX", "accessY")
+}