Remove module resolution caching for now, make resolved modules available from program (#796)

Author: andrewbranch

cmd/tsgo/main.go

@@ -169,7 +169,7 @@ func runMain() int {
 
 	currentDirectory = tspath.GetDirectoryPath(configFileName)
 	// !!! is the working directory actually the config path?
-	host := ts.NewCompilerHost(compilerOptions, currentDirectory, fs, defaultLibraryPath)
+	host := ts.NewCachedFSCompilerHost(compilerOptions, currentDirectory, fs, defaultLibraryPath)
 
 	parseStart := time.Now()
 	program := ts.NewProgram(ts.ProgramOptions{

internal/compiler/host.go

@@ -7,6 +7,7 @@ import (
 	"github.com/microsoft/typescript-go/internal/scanner"
 	"github.com/microsoft/typescript-go/internal/tspath"
 	"github.com/microsoft/typescript-go/internal/vfs"
+	"github.com/microsoft/typescript-go/internal/vfs/cachedvfs"
 )
 
 type CompilerHost interface {
@@ -32,6 +33,10 @@ type compilerHost struct {
 	defaultLibraryPath string
 }
 
+func NewCachedFSCompilerHost(options *core.CompilerOptions, currentDirectory string, fs vfs.FS, defaultLibraryPath string) CompilerHost {
+	return NewCompilerHost(options, currentDirectory, cachedvfs.From(fs), defaultLibraryPath)
+}
+
 func NewCompilerHost(options *core.CompilerOptions, currentDirectory string, fs vfs.FS, defaultLibraryPath string) CompilerHost {
 	h := &compilerHost{}
 	h.options = options