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package main
import (
"flag"
"fmt"
"log"
"os"
"path/filepath"
"slices"
"sort"
"strings"
"github.com/vektah/gqlparser/v2"
"github.com/vektah/gqlparser/v2/ast"
)
func main() {
out := flag.String("out", "", "Output file.")
flag.Parse()
log.SetFlags(log.Lshortfile)
var src []*ast.Source
for _, pattern := range flag.Args() {
files, err := filepath.Glob(pattern)
if err != nil {
log.Fatal("ERROR:", err)
}
for _, file := range files {
data, err := os.ReadFile(file)
if err != nil {
log.Fatal("ERROR:", err)
}
src = append(src, &ast.Source{
Name: file,
Input: string(data),
})
}
}
sch, err := gqlparser.LoadSchema(src...)
if err != nil {
log.Fatal("ERROR:", err)
}
w := os.Stdout
if *out != "" {
fd, err := os.Create(*out)
if err != nil {
log.Fatal("ERROR:", err)
}
defer fd.Close()
w = fd
}
typeName := func(n *ast.Type) string {
result := ""
switch n.Name() {
case "String", "ID":
result = "string"
case "Int":
result = "number"
case "Boolean":
result = "boolean"
default:
result = n.Name()
}
isArrayType := (n.String())[:1] == "["
if isArrayType {
result += "[]"
}
return result
}
fmt.Fprintf(w, "// Code generated by devtools/gqltsgen DO NOT EDIT.\n\n")
var types []*ast.Definition
for _, typ := range sch.Types {
types = append(types, typ)
}
// sort by name to ensure consistent output
slices.SortFunc(types, func(a, b *ast.Definition) int {
if a.Name == b.Name {
return 0
}
if a.Name < b.Name {
return -1
}
return 1
})
for _, def := range types {
switch def.Kind {
case ast.Enum:
fmt.Fprintf(w, "export type %s = ", def.Name)
slices.SortFunc(def.EnumValues, func(a, b *ast.EnumValueDefinition) int {
if a.Name == b.Name {
return 0
}
if a.Name < b.Name {
return -1
}
return 1
})
for _, e := range def.EnumValues {
fmt.Fprintf(w, " | '%s'", e.Name)
}
fmt.Fprintf(w, "\n\n")
case ast.InputObject, ast.Object:
fmt.Fprintf(w, "export interface %s {\n", def.Name)
slices.SortFunc(def.Fields, func(a, b *ast.FieldDefinition) int {
if a.Name == b.Name {
return 0
}
if a.Name < b.Name {
return -1
}
return 1
})
for _, e := range def.Fields {
mod := "?"
modTypeName := "null | "
if e.Type.NonNull {
mod = ""
modTypeName = ""
}
fmt.Fprintf(w, " %s: %s\n", e.Name+mod, modTypeName+typeName(e.Type))
}
fmt.Fprintf(w, "}\n\n")
case ast.Scalar:
typeName := "string"
if def.Name == "WeekdayFilter" {
typeName = "[boolean, boolean, boolean, boolean, boolean, boolean, boolean]"
}
if strings.HasSuffix(def.Name, "Map") {
typeName = "Record<string, string>"
}
fmt.Fprintf(w, "export type %s = %s\n\n", def.Name, typeName)
case ast.Union:
sort.Strings(def.Types)
fmt.Fprintf(w, "export type %s = %s\n\n", def.Name, strings.Join(def.Types, " | "))
default:
log.Fatalln("Unsupported kind:", def.Name, def.Kind)
}
}
}
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