jspacker - examples_test.go

     1  package jspacker_test
     2  
     3  import (
     4  	"fmt"
     5  	"io/fs"
     6  
     7  	"vimagination.zapto.org/javascript"
     8  	"vimagination.zapto.org/jspacker"
     9  	"vimagination.zapto.org/parser"
    10  )
    11  
    12  func Example() {
    13  	files := map[string]string{
    14  		"/main.js":      `import fn from './lib/utils.js'; const v = 2; console.log(v + fn())`,
    15  		"/lib/utils.js": "export default () => 1;",
    16  	}
    17  	loader := func(file string) (*javascript.Module, error) {
    18  		src, ok := files[file]
    19  		if !ok {
    20  			return nil, fs.ErrNotExist
    21  		}
    22  
    23  		tk := parser.NewStringTokeniser(src)
    24  
    25  		return javascript.ParseModule(&tk)
    26  	}
    27  
    28  	script, err := jspacker.Package(jspacker.File("/main.js"), jspacker.NoExports, jspacker.Loader(loader))
    29  	if err != nil {
    30  		fmt.Println(err)
    31  	} else {
    32  		fmt.Printf("%s", script)
    33  	}
    34  
    35  	// Output:
    36  	// const b_default = () => 1;
    37  	//
    38  	// const a_v = 2;
    39  	//
    40  	// console.log(a_v + b_default());
    41  }
    42