Add deps command to return dependancies of a given script/archive

This does include dependancies that might be needed for building a new
binary with auto extension resolution, but also all imports.

Similar to auto extension resolution, this does take into account only
imports not `require` calls.

Closes #5166

Author: mstoykov

internal/cmd/deps.go

@@ -0,0 +1,71 @@
+package cmd
+
+import (
+	"bytes"
+	"encoding/json"
+	"errors"
+	"slices"
+
+	"github.com/spf13/cobra"
+
+	"go.k6.io/k6/cmd/state"
+	"go.k6.io/k6/ext"
+	"go.k6.io/k6/internal/build"
+)
+
+func getCmdDeps(gs *state.GlobalState) *cobra.Command {
+	depsCmd := &cobra.Command{
+		Use:   "deps",
+		Short: "Resolve dependencies of a test",
+		Long: `Resolve dependencies of a test including automatic extenstion resolution.` +
+			`And outputs all dependencies for the test and whether custom build is required.`,
+		Args: cobra.ExactArgs(1),
+		RunE: func(cmd *cobra.Command, args []string) error {
+			test, err := loadLocalTestWithoutRunner(gs, cmd, args)
+			if err != nil {
+				var unsatisfiedErr binaryIsNotSatisfyingDependenciesError
+				if !errors.As(err, &unsatisfiedErr) {
+					return err
+				}
+			}
+
+			deps := test.Dependencies()
+			depsMap := map[string]string{}
+			for name, constraint := range deps {
+				if constraint == nil {
+					depsMap[name] = "*"
+					continue
+				}
+				depsMap[name] = constraint.String()
+			}
+			imports := test.Imports()
+			slices.Sort(imports)
+
+			result := struct {
+				Dependencies        map[string]string `json:"dependencies"`
+				Imports             []string          `json:"imports"`
+				CustomBuildRequired bool              `json:"customBuildRequired"`
+			}{
+				Dependencies:        depsMap,
+				Imports:             imports,
+				CustomBuildRequired: isCustomBuildRequired(deps, build.Version, ext.GetAll()),
+			}
+
+			buf := &bytes.Buffer{}
+			enc := json.NewEncoder(buf)
+			enc.SetEscapeHTML(false)
+			enc.SetIndent("", "  ")
+			if err := enc.Encode(result); err != nil {
+				return err
+			}
+
+			printToStdout(gs, buf.String())
+			return nil
+		},
+	}
+
+	depsCmd.Flags().SortFlags = false
+	depsCmd.Flags().AddFlagSet(runtimeOptionFlagSet(false))
+
+	return depsCmd
+}

internal/cmd/deps_test.go

@@ -0,0 +1,140 @@
+package cmd
+
+import (
+	"encoding/json"
+	"slices"
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	"go.k6.io/k6/internal/cmd/tests"
+	"go.k6.io/k6/internal/lib/testutils"
+)
+
+func TestGetCmdDeps(t *testing.T) {
+	t.Parallel()
+	testCases := []struct {
+		name              string
+		files             map[string][]byte
+		expectedDeps      map[string]string
+		expectCustomBuild bool
+		expectedImports   []string
+	}{
+		{
+			name: "single external dependency",
+			files: map[string][]byte{
+				"/main.js": []byte(`import http from "k6/http";
+import foo from "k6/x/foo";
+
+export default function () {
+  http.get("https://example.com");
+  foo();
+}
+`),
+			},
+			expectedDeps:      map[string]string{"k6/x/foo": "*"},
+			expectCustomBuild: true,
+			expectedImports:   []string{"/main.js", "k6/http", "k6/x/foo"},
+		},
+		{
+			name: "no external dependency",
+			files: map[string][]byte{
+				"/main.js": []byte(`import http from "k6/http";
+
+export default function () {
+  http.get("https://example.com");
+}
+`),
+			},
+			expectedDeps:      map[string]string{},
+			expectCustomBuild: false,
+			expectedImports:   []string{"/main.js", "k6/http"},
+		},
+		{
+			name: "nested local imports",
+			files: map[string][]byte{
+				"/main.js": []byte(`import helper from "./lib/helper.js";
+
+export default function () {
+  helper();
+}
+`),
+				"/lib/helper.js": []byte(`import nested from "../shared/nested.js";
+import ext from "k6/x/bar";
+
+export default function () {
+  nested();
+  ext();
+}
+`),
+				"/shared/nested.js": []byte(`export default function () {
+  return "nested";
+}
+`),
+			},
+			expectedDeps:      map[string]string{"k6/x/bar": "*"},
+			expectCustomBuild: true,
+			expectedImports:   []string{"/lib/helper.js", "/main.js", "/shared/nested.js", "k6/x/bar"},
+		},
+		{
+			name: "use directive across files",
+			files: map[string][]byte{
+				"/main.js": []byte(`import directive from "./modules/with-directive.js";
+
+export default function () {
+  directive();
+}
+`),
+				"/modules/with-directive.js": []byte(`"use k6 with k6/x/alpha >= 1.2.3";
+import beta from "k6/x/beta";
+import util from "./util.js";
+
+export default function () {
+  util();
+  beta();
+}
+`),
+				"/modules/util.js": []byte(`export default function () {
+  return "util";
+}
+`),
+			},
+			expectedDeps:      map[string]string{"k6/x/alpha": ">=1.2.3", "k6/x/beta": "*"},
+			expectCustomBuild: true,
+			expectedImports:   []string{"/main.js", "/modules/util.js", "/modules/with-directive.js", "k6/x/beta"},
+		},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			t.Parallel()
+			ts := tests.NewGlobalTestState(t)
+			ts.FS = testutils.MakeMemMapFs(t, tc.files)
+
+			cmd := getCmdDeps(ts.GlobalState)
+			cmd.SetArgs([]string{"/main.js"})
+			require.NoError(t, cmd.Execute())
+
+			var output struct {
+				Dependencies        map[string]string `json:"dependencies"`
+				Imports             []string          `json:"imports"`
+				CustomBuildRequired bool              `json:"customBuildRequired"`
+			}
+			require.NoError(t, json.Unmarshal(ts.Stdout.Bytes(), &output))
+
+			require.Equal(t, tc.expectedDeps, output.Dependencies)
+
+			require.Equal(t, tc.expectCustomBuild, output.CustomBuildRequired)
+
+			expectedImports := slices.Clone(tc.expectedImports)
+			for i, expectedImport := range tc.expectedImports {
+				if !strings.HasPrefix(expectedImport, "k6") {
+					expectedImports[i] = "file://" + expectedImport
+				}
+			}
+
+			require.EqualValues(t, expectedImports, output.Imports)
+		})
+	}
+}

internal/cmd/root.go

@@ -78,7 +78,7 @@ func newRootCommand(gs *state.GlobalState) *rootCommand {
 	rootCmd.SetIn(gs.Stdin)
 
 	subCommands := []func(*state.GlobalState) *cobra.Command{
-		getCmdArchive, getCmdCloud, getCmdNewScript, getCmdInspect,
+		getCmdArchive, getCmdCloud, getCmdNewScript, getCmdInspect, getCmdDeps,
 		getCmdLogin, getCmdPause, getCmdResume, getCmdScale, getCmdRun,
 		getCmdStats, getCmdStatus, getCmdVersion,
 	}

internal/cmd/runtime_options_test.go

@@ -75,7 +75,8 @@ func testRuntimeOptionsCase(t *testing.T, tc runtimeOptionsTestCase) {
 		},
 	}
 
-	require.NoError(t, test.initializeFirstRunner(ts.GlobalState))
+	require.NoError(t, test.prepareFirstRunner(ts.GlobalState))
+	require.NoError(t, test.continueInitialization(ts.GlobalState))
 
 	archive := test.initRunner.MakeArchive()
 	archiveBuf := &bytes.Buffer{}
@@ -97,11 +98,13 @@ func testRuntimeOptionsCase(t *testing.T, tc runtimeOptionsTestCase) {
 	}
 
 	archTest := getRunnerErr(lib.RuntimeOptions{})
-	require.NoError(t, archTest.initializeFirstRunner(ts.GlobalState))
+	require.NoError(t, archTest.prepareFirstRunner(ts.GlobalState))
+	require.NoError(t, archTest.continueInitialization(ts.GlobalState))
 
 	for key, val := range tc.expRTOpts.Env {
 		archTest = getRunnerErr(lib.RuntimeOptions{Env: map[string]string{key: "almost " + val}})
-		require.NoError(t, archTest.initializeFirstRunner(ts.GlobalState))
+		require.NoError(t, archTest.prepareFirstRunner(ts.GlobalState))
+		require.NoError(t, archTest.continueInitialization(ts.GlobalState))
 		assert.Equal(t, "almost "+val, archTest.initRunner.MakeArchive().Env[key])
 	}
 }