Function TestInjectSideEffectImport

imports_test.go:142–170

TestInjectSideEffectImport exercises the bare-import form, deduplication, and per-module placement against a clausal import for the same module.

(t *testing.T)

// TestInjectSideEffectImport exercises the bare-import form, deduplication,
// and per-module placement against a clausal import for the same module.
func TestInjectSideEffectImport(t *testing.T) {
	t.Parallel()

	ts := loadTypescript(t)
	ts.ApplyMutations(
		config.InjectImport("zod", "z"),
		config.InjectSideEffectImport("./polyfill"),
		// Second call must dedupe.
		config.InjectSideEffectImport("./polyfill"),
		// Side-effect for a module that also has a clausal import. Side-effect
		// goes before the clausal import for the same module.
		config.InjectSideEffectImport("zod"),
	)
	output, err := ts.Serialize()
	require.NoError(t, err, "serialize")

	block := importBlock(t, output)
	require.Contains(t, block, `import "./polyfill";`,
		"side-effect import must emit with no clause")
	require.Equal(t, 1, strings.Count(block, `import "./polyfill";`),
		"side-effect imports must dedupe per module")

	sideZodIdx := strings.Index(block, `import "zod";`)
	clausalZodIdx := strings.Index(block, `import { z } from "zod";`)
	require.GreaterOrEqual(t, sideZodIdx, 0, "side-effect zod import must appear")
	require.GreaterOrEqual(t, clausalZodIdx, 0, "clausal zod import must appear")
	require.Less(t, sideZodIdx, clausalZodIdx,
		"side-effect import must precede clausal import for the same module")
}