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How to use sourceMapLoader method of compiler Package

Best K6 code snippet using compiler.sourceMapLoader

compiler.go

Source:compiler.go

...170// Compile the program in the given CompatibilityMode, wrapping it between pre and post code171func (c *Compiler) Compile(src, filename string, main bool) (*goja.Program, string, error) {172	return c.compileImpl(src, filename, main, c.Options.CompatibilityMode, nil)173}174// sourceMapLoader is to be used with goja's WithSourceMapLoader175// it not only gets the file from disk in the simple case, but also returns it if the map was generated from babel176// additioanlly it fixes off by one error in commonjs dependencies due to having to wrap them in a function.177func (c *compilationState) sourceMapLoader(path string) ([]byte, error) {178	if path == sourceMapURLFromBabel {179		if !c.main {180			return c.increaseMappingsByOne(c.srcMap)181		}182		return c.srcMap, nil183	}184	c.srcMap, c.srcMapError = c.compiler.Options.SourceMapLoader(path)185	if c.srcMapError != nil {186		c.couldntLoadSourceMap = true187		return nil, c.srcMapError188	}189	_, c.srcMapError = sourcemap.Parse(path, c.srcMap)190	if c.srcMapError != nil {191		c.couldntLoadSourceMap = true192		c.srcMap = nil193		return nil, c.srcMapError194	}195	if !c.main {196		return c.increaseMappingsByOne(c.srcMap)197	}198	return c.srcMap, nil199}200func (c *Compiler) compileImpl(201	src, filename string, main bool, compatibilityMode lib.CompatibilityMode, srcMap []byte,202) (*goja.Program, string, error) {203	code := src204	state := compilationState{srcMap: srcMap, compiler: c, main: main}205	if !main { // the lines in the sourcemap (if available) will be fixed by increaseMappingsByOne206		code = "(function(module, exports){\n" + code + "\n})\n"207	}208	opts := parser.WithDisableSourceMaps209	if c.Options.SourceMapLoader != nil {210		opts = parser.WithSourceMapLoader(state.sourceMapLoader)211	}212	ast, err := parser.ParseFile(nil, filename, code, 0, opts)213	if state.couldntLoadSourceMap {214		state.couldntLoadSourceMap = false // reset215		// we probably don't want to abort scripts which have source maps but they can't be found,216		// this also will be a breaking change, so if we couldn't we retry with it disabled217		c.logger.WithError(state.srcMapError).Warnf("Couldn't load source map for %s", filename)218		ast, err = parser.ParseFile(nil, filename, code, 0, parser.WithDisableSourceMaps)219	}220	if err != nil {221		if compatibilityMode == lib.CompatibilityModeExtended {222			code, state.srcMap, err = c.Transform(src, filename, state.srcMap)223			if err != nil {224				return nil, code, err...

compiler_test.go

Source:compiler_test.go

1/*2 *3 * k6 - a next-generation load testing tool4 * Copyright (C) 2017 Load Impact5 *6 * This program is free software: you can redistribute it and/or modify7 * it under the terms of the GNU Affero General Public License as8 * published by the Free Software Foundation, either version 3 of the9 * License, or (at your option) any later version.10 *11 * This program is distributed in the hope that it will be useful,12 * but WITHOUT ANY WARRANTY; without even the implied warranty of13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the14 * GNU Affero General Public License for more details.15 *16 * You should have received a copy of the GNU Affero General Public License17 * along with this program.  If not, see <http://www.gnu.org/licenses/>.18 *19 */20package compiler21import (22	"errors"23	"io/ioutil"24	"strings"25	"testing"26	"github.com/dop251/goja"27	"github.com/sirupsen/logrus"28	"github.com/stretchr/testify/assert"29	"github.com/stretchr/testify/require"30	"go.k6.io/k6/lib"31	"go.k6.io/k6/lib/testutils"32)33func TestTransform(t *testing.T) {34	t.Parallel()35	t.Run("blank", func(t *testing.T) {36		t.Parallel()37		c := New(testutils.NewLogger(t))38		src, _, err := c.Transform("", "test.js", nil)39		assert.NoError(t, err)40		assert.Equal(t, `"use strict";`, src)41	})42	t.Run("double-arrow", func(t *testing.T) {43		t.Parallel()44		c := New(testutils.NewLogger(t))45		src, _, err := c.Transform("()=> true", "test.js", nil)46		assert.NoError(t, err)47		assert.Equal(t, `"use strict";() => true;`, src)48	})49	t.Run("longer", func(t *testing.T) {50		t.Parallel()51		c := New(testutils.NewLogger(t))52		src, _, err := c.Transform(strings.Join([]string{53			`function add(a, b) {`,54			`    return a + b;`,55			`};`,56			``,57			`let res = add(1, 2);`,58		}, "\n"), "test.js", nil)59		assert.NoError(t, err)60		assert.Equal(t, strings.Join([]string{61			`"use strict";function add(a, b) {`,62			`    return a + b;`,63			`};`,64			``,65			`let res = add(1, 2);`,66		}, "\n"), src)67	})68	t.Run("double-arrow with sourceMap", func(t *testing.T) {69		t.Parallel()70		c := New(testutils.NewLogger(t))71		c.Options.SourceMapLoader = func(string) ([]byte, error) { return nil, errors.New("shouldn't be called") }72		src, _, err := c.Transform("()=> true", "test.js", nil)73		assert.NoError(t, err)74		assert.Equal(t, `"use strict";75() => true;76//# sourceMappingURL=k6://internal-should-not-leak/file.map`, src)77	})78}79func TestCompile(t *testing.T) {80	t.Parallel()81	t.Run("ES5", func(t *testing.T) {82		t.Parallel()83		c := New(testutils.NewLogger(t))84		src := `1+(function() { return 2; })()`85		pgm, code, err := c.Compile(src, "script.js", true)86		require.NoError(t, err)87		assert.Equal(t, src, code)88		v, err := goja.New().RunProgram(pgm)89		if assert.NoError(t, err) {90			assert.Equal(t, int64(3), v.Export())91		}92	})93	t.Run("ES5 Wrap", func(t *testing.T) {94		t.Parallel()95		c := New(testutils.NewLogger(t))96		src := `exports.d=1+(function() { return 2; })()`97		pgm, code, err := c.Compile(src, "script.js", false)98		require.NoError(t, err)99		assert.Equal(t, "(function(module, exports){\nexports.d=1+(function() { return 2; })()\n})\n", code)100		rt := goja.New()101		v, err := rt.RunProgram(pgm)102		if assert.NoError(t, err) {103			fn, ok := goja.AssertFunction(v)104			if assert.True(t, ok, "not a function") {105				exp := make(map[string]goja.Value)106				_, err := fn(goja.Undefined(), goja.Undefined(), rt.ToValue(exp))107				if assert.NoError(t, err) {108					assert.Equal(t, int64(3), exp["d"].Export())109				}110			}111		}112	})113	t.Run("ES5 Invalid", func(t *testing.T) {114		t.Parallel()115		c := New(testutils.NewLogger(t))116		src := `1+(function() { return 2; )()`117		c.Options.CompatibilityMode = lib.CompatibilityModeExtended118		_, _, err := c.Compile(src, "script.js", false)119		assert.IsType(t, &goja.Exception{}, err)120		assert.Contains(t, err.Error(), `SyntaxError: script.js: Unexpected token (1:26)121> 1 | 1+(function() { return 2; )()`)122	})123	t.Run("ES6", func(t *testing.T) {124		t.Parallel()125		c := New(testutils.NewLogger(t))126		c.Options.CompatibilityMode = lib.CompatibilityModeExtended127		pgm, code, err := c.Compile(`3**2`, "script.js", true)128		require.NoError(t, err)129		assert.Equal(t, `"use strict";Math.pow(3, 2);`, code)130		v, err := goja.New().RunProgram(pgm)131		if assert.NoError(t, err) {132			assert.Equal(t, int64(9), v.Export())133		}134	})135	t.Run("Wrap", func(t *testing.T) {136		t.Parallel()137		c := New(testutils.NewLogger(t))138		c.Options.CompatibilityMode = lib.CompatibilityModeExtended139		pgm, code, err := c.Compile(`exports.fn(3**2)`, "script.js", false)140		require.NoError(t, err)141		assert.Equal(t, "(function(module, exports){\n\"use strict\";exports.fn(Math.pow(3, 2));\n})\n", code)142		rt := goja.New()143		v, err := rt.RunProgram(pgm)144		if assert.NoError(t, err) {145			fn, ok := goja.AssertFunction(v)146			if assert.True(t, ok, "not a function") {147				exp := make(map[string]goja.Value)148				var out interface{}149				exp["fn"] = rt.ToValue(func(v goja.Value) {150					out = v.Export()151				})152				_, err := fn(goja.Undefined(), goja.Undefined(), rt.ToValue(exp))153				assert.NoError(t, err)154				assert.Equal(t, int64(9), out)155			}156		}157	})158	t.Run("Invalid", func(t *testing.T) {159		t.Parallel()160		c := New(testutils.NewLogger(t))161		c.Options.CompatibilityMode = lib.CompatibilityModeExtended162		_, _, err := c.Compile(`1+(=>2)()`, "script.js", true)163		assert.IsType(t, &goja.Exception{}, err)164		assert.Contains(t, err.Error(), `SyntaxError: script.js: Unexpected token (1:3)165> 1 | 1+(=>2)()`)166	})167}168func TestCorruptSourceMap(t *testing.T) {169	t.Parallel()170	corruptSourceMap := []byte(`{"mappings": 12}`) // 12 is a number not a string171	logger := logrus.New()172	logger.SetLevel(logrus.DebugLevel)173	logger.Out = ioutil.Discard174	hook := testutils.SimpleLogrusHook{175		HookedLevels: []logrus.Level{logrus.InfoLevel, logrus.WarnLevel},176	}177	logger.AddHook(&hook)178	compiler := New(logger)179	compiler.Options = Options{180		Strict: true,181		SourceMapLoader: func(string) ([]byte, error) {182			return corruptSourceMap, nil183		},184	}185	_, _, err := compiler.Compile("var s = 5;\n//# sourceMappingURL=somefile", "somefile", false)186	require.NoError(t, err)187	entries := hook.Drain()188	require.Len(t, entries, 1)189	msg, err := entries[0].String() // we need this in order to get the field error190	require.NoError(t, err)191	require.Contains(t, msg, `Couldn't load source map for somefile`)192	require.Contains(t, msg, `json: cannot unmarshal number into Go struct field v3.mappings of type string`)193}194func TestCorruptSourceMapOnlyForBabel(t *testing.T) {195	t.Parallel()196	// this a valid source map for the go implementation but babel doesn't like it197	corruptSourceMap := []byte(`{"mappings": ";"}`)198	logger := logrus.New()199	logger.SetLevel(logrus.DebugLevel)200	logger.Out = ioutil.Discard201	hook := testutils.SimpleLogrusHook{202		HookedLevels: []logrus.Level{logrus.InfoLevel, logrus.WarnLevel},203	}204	logger.AddHook(&hook)205	compiler := New(logger)206	compiler.Options = Options{207		CompatibilityMode: lib.CompatibilityModeExtended,208		Strict:            true,209		SourceMapLoader: func(string) ([]byte, error) {210			return corruptSourceMap, nil211		},212	}213	_, _, err := compiler.Compile("class s {};\n//# sourceMappingURL=somefile", "somefile", false)214	require.NoError(t, err)215	entries := hook.Drain()216	require.Len(t, entries, 1)217	msg, err := entries[0].String() // we need this in order to get the field error218	require.NoError(t, err)219	require.Contains(t, msg, `needs to be transpiled by Babel, but its source map will not be accepted by Babel`)220	require.Contains(t, msg, `source map missing required 'version' field`)221}222func TestMinimalSourceMap(t *testing.T) {223	t.Parallel()224	// this is the minimal sourcemap valid for both go and babel implementations225	corruptSourceMap := []byte(`{"version":3,"mappings":";","sources":[]}`)226	logger := logrus.New()227	logger.SetLevel(logrus.DebugLevel)228	logger.Out = ioutil.Discard229	hook := testutils.SimpleLogrusHook{230		HookedLevels: []logrus.Level{logrus.InfoLevel, logrus.WarnLevel},231	}232	logger.AddHook(&hook)233	compiler := New(logger)234	compiler.Options = Options{235		CompatibilityMode: lib.CompatibilityModeExtended,236		Strict:            true,237		SourceMapLoader: func(string) ([]byte, error) {238			return corruptSourceMap, nil239		},240	}241	_, _, err := compiler.Compile("class s {};\n//# sourceMappingURL=somefile", "somefile", false)242	require.NoError(t, err)243	require.Empty(t, hook.Drain())244}...

sourceMapLoader

Using AI Code Generation

1import (2func main() {3	db := memorydb.New()4	statedb, _ := state.New(common.Hash{}, state.NewDatabase(db))5	block := types.NewBlock(&types.Header{}, nil, nil, nil)6	env := core.NewEVMBlockContext(block.Header(), nil, nil)7	context := core.NewEVMContext(msg, block.Header(), nil, nil)8	evm := vm.NewEVM(env, context, statedb, params.TestChainConfig, vm.Config{})9	rt := runtime.New(evm, statedb, params.TestChainConfig, evm.ChainConfig(), vm.Config{}, nil)10	compiler := vm.NewCompiler(evm.ChainConfig(), rt, nil)11	sourceMap, err := compiler.SourceMap("0x1234567890123456789012345678901234567890")12	if err != nil {13		fmt.Println(err)14	}15	fmt.Println(sourceMap)16}17{"1":1,"2":2,"3":3,"4":4,"5":5,"6":6,"7":7,"8":8,"9":9,"10":10,"11":11,"12":12,"13":13,"14":14,"15":15,"16":16,"17":17,"18":18,"19":19,"20":20,"21":21,"22":22,"23":23,"24":24,"25":25,"26":26,"27":27,"28":28,"29":29,"30":30,"31":31,"32":32,"33":33,"34":34,"35":35,"36":36,"37":37,"

sourceMapLoader

Using AI Code Generation

1import "fmt"2import "github.com/ethereum/go-ethereum/core/vm"3func main() {4    var sourceMapLoader func(path string) (string, error)5    sourceMapLoader = func(path string) (string, error) {6    }7    compiler := vm.NewEVMCompiler(sourceMapLoader)8    fmt.Println(compiler)9}10import "fmt"11import "github.com/ethereum/go-ethereum/core/vm"12func main() {13    var sourceMapLoader func(path string) (string, error)14    sourceMapLoader = func(path string) (string, error) {15    }16    compiler := vm.NewEVMCompiler(sourceMapLoader)17    fmt.Println(compiler)18}

sourceMapLoader

Using AI Code Generation

1import java.io.*;2import java.util.*;3import org.openjdk.nashorn.api.scripting.*;4import javax.script.*;5public class 1 {6   public static void main(String[] args) throws Exception {7      ScriptEngineManager sem = new ScriptEngineManager();8      ScriptEngine engine = sem.getEngineByName("nashorn");9      try {10         engine.eval("function add(a, b) { return a + b; }");11         System.out.println("add(3, 4) = " + engine.eval("add(3, 4)"));12         System.out.println("add(3, 4) = " + engine.eval("add(3, 4)"));13      } catch (ScriptException e) {14         e.printStackTrace();15      }16   }17}18add(3, 4) = 719add(3, 4) = 720function add(a, b) {21    return a + b;22}23import java.io.*;24import java.util.*;25import org.openjdk.nashorn.api.scripting.*;26import javax.script.*;27public class 2 {28   public static void main(String[] args) throws Exception {29      ScriptEngineManager sem = new ScriptEngineManager();30      ScriptEngine engine = sem.getEngineByName("nashorn");31      try {32         engine.eval("function add(a, b) { return a + b; }");33         System.out.println("add(3, 4) = " + engine.eval("add(3, 4)"));34         System.out.println("add(3, 4) = " + engine.eval("add(3, 4)"));35      } catch (ScriptException e) {36         e.printStackTrace();37      }38   }39}40add(3, 4) = 741add(3, 4) = 7

sourceMapLoader

Using AI Code Generation

1import "fmt"2import "github.com/robertkrimen/otto"3func main() {4    vm := otto.New()5    vm.Run(`6        var vm = this;7        var sourceMapLoader = vm.require("source-map-support").install({8        });9        sourceMapLoader.loadSourceMap("1.js.map");10    vm.Run(`11        function f() {12            throw new Error("Whoops!");13        }14        f();15    if err := vm.Get("err"); err != nil {16        fmt.Println("Error:", err)17    }18}19{

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