fix(coverage): ignore files from npm registry (#18457)

Fixes https://github.com/denoland/deno/issues/17664 and part of
https://github.com/denoland/deno/issues/18454 by excluding files
belonging to npm modules by default in the coverage output.

3 files changed, 9 insertions, 0 deletions

diff --git a/cli/tests/testdata/coverage/no_npm_coverage/expected.out b/cli/tests/testdata/coverage/no_npm_coverage/expected.out
new file mode 100644
index 000000000..ca4511277
--- /dev/null
+++ b/cli/tests/testdata/coverage/no_npm_coverage/expected.out
@@ -0,0 +1 @@
+cover [WILDCARD]/no_npm_coverage/no_npm_coverage.ts ... 100.000% (4/4)
diff --git a/cli/tests/testdata/coverage/no_npm_coverage/no_npm_coverage.ts b/cli/tests/testdata/coverage/no_npm_coverage/no_npm_coverage.ts
new file mode 100644
index 000000000..4233b2e5d
--- /dev/null
+++ b/cli/tests/testdata/coverage/no_npm_coverage/no_npm_coverage.ts
@@ -0,0 +1,4 @@
+import chalk from "npm:chalk";
+export function main() {
+  console.log(chalk.red("RED"));
+}
diff --git a/cli/tests/testdata/coverage/no_npm_coverage/no_npm_coverage_test.ts b/cli/tests/testdata/coverage/no_npm_coverage/no_npm_coverage_test.ts
new file mode 100644
index 000000000..8305f9597
--- /dev/null
+++ b/cli/tests/testdata/coverage/no_npm_coverage/no_npm_coverage_test.ts
@@ -0,0 +1,4 @@
+import { main } from "./no_npm_coverage.ts";
+Deno.test("main", () => {
+  main();
+});