mirror of https://github.com/coder/coder.git
471 lines
14 KiB
Go
471 lines
14 KiB
Go
package main
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import (
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"context"
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"fmt"
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"go/types"
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"os"
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"path/filepath"
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"reflect"
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"regexp"
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"sort"
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"strings"
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"golang.org/x/tools/go/packages"
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"golang.org/x/xerrors"
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"cdr.dev/slog"
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"cdr.dev/slog/sloggers/sloghuman"
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)
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const (
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baseDir = "./codersdk"
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indent = " "
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)
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func main() {
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ctx := context.Background()
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log := slog.Make(sloghuman.Sink(os.Stderr))
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codeBlocks, err := GenerateFromDirectory(ctx, log, baseDir)
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if err != nil {
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log.Fatal(ctx, err.Error())
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}
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// Just cat the output to a file to capture it
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_, _ = fmt.Println(codeBlocks.String())
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}
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// TypescriptTypes holds all the code blocks created.
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type TypescriptTypes struct {
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// Each entry is the type name, and it's typescript code block.
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Types map[string]string
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Enums map[string]string
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}
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// String just combines all the codeblocks.
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func (t TypescriptTypes) String() string {
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var s strings.Builder
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_, _ = s.WriteString("// Code generated by 'make coder/scripts/apitypings/main.go'. DO NOT EDIT.\n\n")
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sortedTypes := make([]string, 0, len(t.Types))
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sortedEnums := make([]string, 0, len(t.Enums))
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for k := range t.Types {
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sortedTypes = append(sortedTypes, k)
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}
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for k := range t.Enums {
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sortedEnums = append(sortedEnums, k)
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}
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sort.Strings(sortedTypes)
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sort.Strings(sortedEnums)
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for _, k := range sortedTypes {
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v := t.Types[k]
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_, _ = s.WriteString(v)
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_, _ = s.WriteRune('\n')
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}
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for _, k := range sortedEnums {
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v := t.Enums[k]
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_, _ = s.WriteString(v)
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_, _ = s.WriteRune('\n')
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}
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return strings.TrimRight(s.String(), "\n")
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}
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// GenerateFromDirectory will return all the typescript code blocks for a directory
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func GenerateFromDirectory(ctx context.Context, log slog.Logger, directory string) (*TypescriptTypes, error) {
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g := Generator{
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log: log,
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}
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err := g.parsePackage(ctx, directory)
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if err != nil {
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return nil, xerrors.Errorf("parse package %q: %w", directory, err)
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}
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codeBlocks, err := g.generateAll()
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if err != nil {
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return nil, xerrors.Errorf("parse package %q: %w", directory, err)
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}
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return codeBlocks, nil
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}
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type Generator struct {
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// Package we are scanning.
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pkg *packages.Package
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log slog.Logger
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}
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// parsePackage takes a list of patterns such as a directory, and parses them.
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func (g *Generator) parsePackage(ctx context.Context, patterns ...string) error {
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cfg := &packages.Config{
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// Just accept the fact we need these flags for what we want. Feel free to add
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// more, it'll just increase the time it takes to parse.
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Mode: packages.NeedTypes | packages.NeedName | packages.NeedTypesInfo |
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packages.NeedTypesSizes | packages.NeedSyntax,
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Tests: false,
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Context: ctx,
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}
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pkgs, err := packages.Load(cfg, patterns...)
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if err != nil {
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return xerrors.Errorf("load package: %w", err)
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}
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// Only support 1 package for now. We can expand it if we need later, we
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// just need to hook up multiple packages in the generator.
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if len(pkgs) != 1 {
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return xerrors.Errorf("expected 1 package, found %d", len(pkgs))
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}
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g.pkg = pkgs[0]
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return nil
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}
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// generateAll will generate for all types found in the pkg
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func (g *Generator) generateAll() (*TypescriptTypes, error) {
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structs := make(map[string]string)
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enums := make(map[string]types.Object)
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enumConsts := make(map[string][]*types.Const)
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// Look for comments that indicate to ignore a type for typescript generation.
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ignoredTypes := make(map[string]struct{})
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ignoreRegex := regexp.MustCompile("@typescript-ignore[:]?(?P<ignored_types>.*)")
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for _, file := range g.pkg.Syntax {
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for _, comment := range file.Comments {
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for _, line := range comment.List {
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text := line.Text
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matches := ignoreRegex.FindStringSubmatch(text)
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ignored := ignoreRegex.SubexpIndex("ignored_types")
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if len(matches) >= ignored && matches[ignored] != "" {
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arr := strings.Split(matches[ignored], ",")
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for _, s := range arr {
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ignoredTypes[strings.TrimSpace(s)] = struct{}{}
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}
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}
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}
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}
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}
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for _, n := range g.pkg.Types.Scope().Names() {
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obj := g.pkg.Types.Scope().Lookup(n)
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if obj == nil || obj.Type() == nil {
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// This would be weird, but it is if the package does not have the type def.
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continue
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}
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// Exclude ignored types
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if _, ok := ignoredTypes[obj.Name()]; ok {
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continue
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}
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switch obj := obj.(type) {
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// All named types are type declarations
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case *types.TypeName:
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named, ok := obj.Type().(*types.Named)
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if !ok {
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panic("all typename should be named types")
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}
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switch named.Underlying().(type) {
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case *types.Struct:
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// type <Name> struct
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// Structs are obvious.
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st, _ := obj.Type().Underlying().(*types.Struct)
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codeBlock, err := g.buildStruct(obj, st)
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if err != nil {
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return nil, xerrors.Errorf("generate %q: %w", obj.Name(), err)
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}
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structs[obj.Name()] = codeBlock
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case *types.Basic:
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// type <Name> string
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// These are enums. Store to expand later.
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enums[obj.Name()] = obj
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case *types.Map:
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// Declared maps that are not structs are still valid codersdk objects.
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// Handle them custom by calling 'typescriptType' directly instead of
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// iterating through each struct field.
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// These types support no json/typescript tags.
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// These are **NOT** enums, as a map in Go would never be used for an enum.
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ts, err := g.typescriptType(obj.Type().Underlying())
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if err != nil {
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return nil, xerrors.Errorf("(map) generate %q: %w", obj.Name(), err)
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}
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var str strings.Builder
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_, _ = str.WriteString(g.posLine(obj))
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if ts.AboveTypeLine != "" {
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str.WriteString(ts.AboveTypeLine)
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str.WriteRune('\n')
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}
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// Use similar output syntax to enums.
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str.WriteString(fmt.Sprintf("export type %s = %s\n", obj.Name(), ts.ValueType))
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structs[obj.Name()] = str.String()
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case *types.Array, *types.Slice:
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// TODO: @emyrk if you need this, follow the same design as "*types.Map" case.
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}
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case *types.Var:
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// TODO: Are any enums var declarations? This is also codersdk.Me.
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case *types.Const:
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// We only care about named constant types, since they are enums
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if named, ok := obj.Type().(*types.Named); ok {
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name := named.Obj().Name()
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enumConsts[name] = append(enumConsts[name], obj)
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}
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case *types.Func:
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// Noop
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default:
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fmt.Println(obj.Name())
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}
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}
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// Write all enums
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enumCodeBlocks := make(map[string]string)
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for name, v := range enums {
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var values []string
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for _, elem := range enumConsts[name] {
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// TODO: If we have non string constants, we need to handle that
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// here.
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values = append(values, elem.Val().String())
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}
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sort.Strings(values)
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var s strings.Builder
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_, _ = s.WriteString(g.posLine(v))
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_, _ = s.WriteString(fmt.Sprintf("export type %s = %s\n",
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name, strings.Join(values, " | "),
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))
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enumCodeBlocks[name] = s.String()
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}
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return &TypescriptTypes{
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Types: structs,
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Enums: enumCodeBlocks,
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}, nil
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}
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func (g *Generator) posLine(obj types.Object) string {
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file := g.pkg.Fset.File(obj.Pos())
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return fmt.Sprintf("// From %s\n", filepath.Join("codersdk", filepath.Base(file.Name())))
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}
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// buildStruct just prints the typescript def for a type.
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func (g *Generator) buildStruct(obj types.Object, st *types.Struct) (string, error) {
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var s strings.Builder
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_, _ = s.WriteString(g.posLine(obj))
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_, _ = s.WriteString(fmt.Sprintf("export interface %s ", obj.Name()))
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// Handle named embedded structs in the codersdk package via extension.
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var extends []string
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extendedFields := make(map[int]bool)
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for i := 0; i < st.NumFields(); i++ {
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field := st.Field(i)
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tag := reflect.StructTag(st.Tag(i))
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// Adding a json struct tag causes the json package to consider
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// the field unembedded.
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if field.Embedded() && tag.Get("json") == "" && field.Pkg().Name() == "codersdk" {
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extendedFields[i] = true
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extends = append(extends, field.Name())
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}
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}
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if len(extends) > 0 {
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_, _ = s.WriteString(fmt.Sprintf("extends %s ", strings.Join(extends, ", ")))
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}
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_, _ = s.WriteString("{\n")
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// For each field in the struct, we print 1 line of the typescript interface
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for i := 0; i < st.NumFields(); i++ {
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if extendedFields[i] {
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continue
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}
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field := st.Field(i)
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tag := reflect.StructTag(st.Tag(i))
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// Use the json name if present
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jsonName := tag.Get("json")
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arr := strings.Split(jsonName, ",")
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jsonName = arr[0]
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if jsonName == "" {
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jsonName = field.Name()
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}
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jsonOptional := false
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if len(arr) > 1 && arr[1] == "omitempty" {
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jsonOptional = true
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}
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var tsType TypescriptType
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// If a `typescript:"string"` exists, we take this, and do not try to infer.
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typescriptTag := tag.Get("typescript")
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if typescriptTag == "-" {
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// Ignore this field
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continue
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} else if typescriptTag != "" {
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tsType.ValueType = typescriptTag
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} else {
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var err error
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tsType, err = g.typescriptType(field.Type())
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if err != nil {
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return "", xerrors.Errorf("typescript type: %w", err)
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}
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}
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if tsType.AboveTypeLine != "" {
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_, _ = s.WriteString(tsType.AboveTypeLine)
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_, _ = s.WriteRune('\n')
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}
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optional := ""
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if jsonOptional || tsType.Optional {
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optional = "?"
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}
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_, _ = s.WriteString(fmt.Sprintf("%sreadonly %s%s: %s\n", indent, jsonName, optional, tsType.ValueType))
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}
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_, _ = s.WriteString("}\n")
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return s.String(), nil
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}
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type TypescriptType struct {
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ValueType string
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// AboveTypeLine lets you put whatever text you want above the typescript
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// type line.
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AboveTypeLine string
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// Optional indicates the value is an optional field in typescript.
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Optional bool
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}
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// typescriptType this function returns a typescript type for a given
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// golang type.
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// Eg:
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//
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// []byte returns "string"
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func (g *Generator) typescriptType(ty types.Type) (TypescriptType, error) {
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switch ty := ty.(type) {
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case *types.Basic:
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bs := ty
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// All basic literals (string, bool, int, etc).
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switch {
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case bs.Info()&types.IsNumeric > 0:
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return TypescriptType{ValueType: "number"}, nil
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case bs.Info()&types.IsBoolean > 0:
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return TypescriptType{ValueType: "boolean"}, nil
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case bs.Kind() == types.Byte:
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// TODO: @emyrk What is a byte for typescript? A string? A uint8?
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return TypescriptType{ValueType: "number", AboveTypeLine: indentedComment("This is a byte in golang")}, nil
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default:
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return TypescriptType{ValueType: bs.Name()}, nil
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}
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case *types.Struct:
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// This handles anonymous structs. This should never happen really.
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// Such as:
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// type Name struct {
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// Embedded struct {
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// Field string `json:"field"`
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// }
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// }
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return TypescriptType{
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ValueType: "any",
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AboveTypeLine: fmt.Sprintf("%s\n%s",
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indentedComment("Embedded anonymous struct, please fix by naming it"),
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indentedComment("eslint-disable-next-line @typescript-eslint/no-explicit-any"),
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),
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}, nil
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case *types.Map:
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// map[string][string] -> Record<string, string>
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m := ty
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keyType, err := g.typescriptType(m.Key())
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if err != nil {
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return TypescriptType{}, xerrors.Errorf("map key: %w", err)
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}
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valueType, err := g.typescriptType(m.Elem())
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if err != nil {
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return TypescriptType{}, xerrors.Errorf("map key: %w", err)
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}
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return TypescriptType{
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ValueType: fmt.Sprintf("Record<%s, %s>", keyType.ValueType, valueType.ValueType),
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}, nil
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case *types.Slice, *types.Array:
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// Slice/Arrays are pretty much the same.
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type hasElem interface {
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Elem() types.Type
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}
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arr, _ := ty.(hasElem)
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switch {
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// When type checking here, just use the string. You can cast it
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// to a types.Basic and get the kind if you want too :shrug:
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case arr.Elem().String() == "byte":
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// All byte arrays are strings on the typescript.
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// Is this ok?
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return TypescriptType{ValueType: "string"}, nil
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default:
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// By default, just do an array of the underlying type.
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underlying, err := g.typescriptType(arr.Elem())
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if err != nil {
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return TypescriptType{}, xerrors.Errorf("array: %w", err)
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}
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return TypescriptType{ValueType: underlying.ValueType + "[]", AboveTypeLine: underlying.AboveTypeLine}, nil
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}
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case *types.Named:
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n := ty
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// First see if the type is defined elsewhere. If it is, we can just
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// put the name as it will be defined in the typescript codeblock
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// we generate.
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name := n.Obj().Name()
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if obj := g.pkg.Types.Scope().Lookup(name); obj != nil {
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// Sweet! Using other typescript types as fields. This could be an
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// enum or another struct
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return TypescriptType{ValueType: name}, nil
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}
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// These are external named types that we handle uniquely.
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switch n.String() {
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case "net/url.URL":
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return TypescriptType{ValueType: "string"}, nil
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case "time.Time":
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// We really should come up with a standard for time.
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return TypescriptType{ValueType: "string"}, nil
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case "database/sql.NullTime":
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return TypescriptType{ValueType: "string", Optional: true}, nil
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case "github.com/google/uuid.NullUUID":
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return TypescriptType{ValueType: "string", Optional: true}, nil
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case "github.com/google/uuid.UUID":
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return TypescriptType{ValueType: "string"}, nil
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}
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// If it's a struct, just use the name of the struct type
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if _, ok := n.Underlying().(*types.Struct); ok {
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return TypescriptType{ValueType: "any", AboveTypeLine: fmt.Sprintf("%s\n%s",
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indentedComment(fmt.Sprintf("Named type %q unknown, using \"any\"", n.String())),
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indentedComment("eslint-disable-next-line @typescript-eslint/no-explicit-any"),
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)}, nil
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}
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// Defer to the underlying type.
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ts, err := g.typescriptType(ty.Underlying())
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if err != nil {
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return TypescriptType{}, xerrors.Errorf("named underlying: %w", err)
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}
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ts.AboveTypeLine = indentedComment(fmt.Sprintf("This is likely an enum in an external package (%q)", n.String()))
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return ts, nil
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case *types.Pointer:
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// Dereference pointers.
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pt := ty
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resp, err := g.typescriptType(pt.Elem())
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if err != nil {
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return TypescriptType{}, xerrors.Errorf("pointer: %w", err)
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}
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resp.Optional = true
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return resp, nil
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}
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// These are all the other types we need to support.
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// time.Time, uuid, etc.
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return TypescriptType{}, xerrors.Errorf("unknown type: %s", ty.String())
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}
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func indentedComment(comment string) string {
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return fmt.Sprintf("%s// %s", indent, comment)
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}
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