vendor tsgo

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

@@ -0,0 +1,109 @@
+package fourslash_test
+
+import (
+	"testing"
+
+	"github.com/microsoft/typescript-go/internal/fourslash"
+	"github.com/microsoft/typescript-go/internal/testutil"
+)
+
+func TestGoToSourceAtTypesPackage(t *testing.T) {
+	t.Parallel()
+	defer testutil.RecoverAndFail(t, "Panic on fourslash test")
+	// NoDts resolver can't resolve "foo" to any .js (only @types/foo has .d.ts),
+	// so findImplementationFileFromDtsFileName maps @types/foo → foo and finds the .js.
+	const content = `// @moduleResolution: bundler
+// @Filename: /home/src/workspaces/project/node_modules/@types/foo/package.json
+{ "name": "@types/foo", "version": "1.0.0" }
+// @Filename: /home/src/workspaces/project/node_modules/@types/foo/index.d.ts
+export declare function bar(): string;
+// @Filename: /home/src/workspaces/project/node_modules/foo/package.json
+{ "name": "foo", "version": "1.0.0", "main": "./index.js" }
+// @Filename: /home/src/workspaces/project/node_modules/foo/index.js
+export function /*target*/bar() { return "hello"; }
+// @Filename: /home/src/workspaces/project/index.ts
+import { bar } from "foo";
+bar/*usage*/();`
+	f, done := fourslash.NewFourslash(t, nil /*capabilities*/, content)
+	defer done()
+	f.VerifyBaselineGoToSourceDefinition(t, "usage")
+}
+
+func TestGoToSourcePackageIndexDts(t *testing.T) {
+	t.Parallel()
+	defer testutil.RecoverAndFail(t, "Panic on fourslash test")
+	// When the .d.ts is index.d.ts, tryPackageRootFirst is true,
+	// so package root resolution is tried before subpath.
+	const content = `// @moduleResolution: bundler
+// @Filename: /home/src/workspaces/project/node_modules/pkg/package.json
+{ "name": "pkg", "main": "./lib/index.js", "types": "./lib/index.d.ts" }
+// @Filename: /home/src/workspaces/project/node_modules/pkg/lib/index.d.ts
+export declare function greet(): string;
+// @Filename: /home/src/workspaces/project/node_modules/pkg/lib/index.js
+export function /*target*/greet() { return "hi"; }
+// @Filename: /home/src/workspaces/project/index.ts
+import { greet } from "pkg";
+greet/*usage*/();`
+	f, done := fourslash.NewFourslash(t, nil /*capabilities*/, content)
+	defer done()
+	f.VerifyBaselineGoToSourceDefinition(t, "usage")
+}
+
+func TestGoToSourcePackageRootThenSubpath(t *testing.T) {
+	t.Parallel()
+	defer testutil.RecoverAndFail(t, "Panic on fourslash test")
+	// tryPackageRootFirst is true (index.d.ts), root resolution fails because
+	// there's no main entry, but subpath resolution ("pkg/index") succeeds.
+	const content = `// @moduleResolution: bundler
+// @Filename: /home/src/workspaces/project/node_modules/pkg/package.json
+{ "name": "pkg", "types": "./index.d.ts" }
+// @Filename: /home/src/workspaces/project/node_modules/pkg/index.d.ts
+export declare function work(): void;
+// @Filename: /home/src/workspaces/project/node_modules/pkg/index.js
+export function /*target*/work() {}
+// @Filename: /home/src/workspaces/project/index.ts
+import { work } from "pkg";
+work/*usage*/();`
+	f, done := fourslash.NewFourslash(t, nil /*capabilities*/, content)
+	defer done()
+	f.VerifyBaselineGoToSourceDefinition(t, "usage")
+}
+
+func TestGoToSourcePackageRootFallsBackToSubpath(t *testing.T) {
+	t.Parallel()
+	defer testutil.RecoverAndFail(t, "Panic on fourslash test")
+	// tryPackageRootFirst is true (index.d.ts), root resolution fails,
+	// falls back to subpath.
+	const content = `// @moduleResolution: bundler
+// @Filename: /home/src/workspaces/project/node_modules/pkg/package.json
+{ "name": "pkg", "types": "./index.d.ts" }
+// @Filename: /home/src/workspaces/project/node_modules/pkg/index.d.ts
+export declare function work(): void;
+// @Filename: /home/src/workspaces/project/node_modules/pkg/index.js
+export function /*target*/work() {}
+// @Filename: /home/src/workspaces/project/index.ts
+import { work } from "pkg";
+work/*usage*/();`
+	f, done := fourslash.NewFourslash(t, nil /*capabilities*/, content)
+	defer done()
+	f.VerifyBaselineGoToSourceDefinition(t, "usage")
+}
+
+func TestGoToSourceSubpathNotIndex(t *testing.T) {
+	t.Parallel()
+	defer testutil.RecoverAndFail(t, "Panic on fourslash test")
+	// Subpath resolution succeeds when the d.ts is NOT index.d.ts.
+	const content = `// @moduleResolution: bundler
+// @Filename: /home/src/workspaces/project/node_modules/pkg/package.json
+{ "name": "pkg", "types": "./lib/utils.d.ts" }
+// @Filename: /home/src/workspaces/project/node_modules/pkg/lib/utils.d.ts
+export declare function util(): void;
+// @Filename: /home/src/workspaces/project/node_modules/pkg/lib/utils.js
+export function /*target*/util() {}
+// @Filename: /home/src/workspaces/project/index.ts
+import { util } from "pkg";
+util/*usage*/();`
+	f, done := fourslash.NewFourslash(t, nil /*capabilities*/, content)
+	defer done()
+	f.VerifyBaselineGoToSourceDefinition(t, "usage")
+}