fix(coverage): do not report transpiled files with no lines (#14699)

This commit omits files from the coverage report that have no
lines of code to report coverage for.

Fixes: https://github.com/denoland/deno/issues/14683

5 files changed, 28 insertions, 0 deletions

diff --git a/cli/tests/testdata/coverage/no_transpiled_lines/expected.lcov b/cli/tests/testdata/coverage/no_transpiled_lines/expected.lcov
new file mode 100644
index 000000000..fae96ed35
--- /dev/null
+++ b/cli/tests/testdata/coverage/no_transpiled_lines/expected.lcov
@@ -0,0 +1,12 @@
+SF:[WILDCARD]index.ts
+FNF:0
+FNH:0
+BRF:0
+BRH:0
+DA:1,1
+DA:2,1
+DA:3,1
+DA:5,1
+LH:4
+LF:4
+end_of_record
diff --git a/cli/tests/testdata/coverage/no_transpiled_lines/expected.out b/cli/tests/testdata/coverage/no_transpiled_lines/expected.out
new file mode 100644
index 000000000..792bd654f
--- /dev/null
+++ b/cli/tests/testdata/coverage/no_transpiled_lines/expected.out
@@ -0,0 +1 @@
+cover [WILDCARD]index.ts ... 100.000% (4/4)
diff --git a/cli/tests/testdata/coverage/no_transpiled_lines/index.ts b/cli/tests/testdata/coverage/no_transpiled_lines/index.ts
new file mode 100644
index 000000000..d22b1673d
--- /dev/null
+++ b/cli/tests/testdata/coverage/no_transpiled_lines/index.ts
@@ -0,0 +1,5 @@
+export {
+  assertStrictEquals,
+} from "https://deno.land/std@0.139.0/testing/asserts.ts";
+
+export * from "./interface.ts";
diff --git a/cli/tests/testdata/coverage/no_transpiled_lines/interface.ts b/cli/tests/testdata/coverage/no_transpiled_lines/interface.ts
new file mode 100644
index 000000000..6e58a7b2f
--- /dev/null
+++ b/cli/tests/testdata/coverage/no_transpiled_lines/interface.ts
@@ -0,0 +1,3 @@
+export interface TestInterface {
+  id: string;
+}
diff --git a/cli/tests/testdata/coverage/no_transpiled_lines/repro_test.ts b/cli/tests/testdata/coverage/no_transpiled_lines/repro_test.ts
new file mode 100644
index 000000000..ca4a0d17f
--- /dev/null
+++ b/cli/tests/testdata/coverage/no_transpiled_lines/repro_test.ts
@@ -0,0 +1,7 @@
+import { assertStrictEquals, TestInterface } from "./index.ts";
+
+Deno.test(function noTranspiledLines() {
+  const foo: TestInterface = { id: "id" };
+
+  assertStrictEquals(foo.id, "id");
+});