Method refreshTypesFile

plugins/jsvm/jsvm.go:487–516

refreshTypesFile saves the embedded TS declarations as a file on the disk.

()

// refreshTypesFile saves the embedded TS declarations as a file on the disk.
func (p *plugin) refreshTypesFile() error {
	fullPath := p.fullTypesPath()

	// ensure that the types directory exists
	dir := filepath.Dir(fullPath)
	if err := os.MkdirAll(dir, os.ModePerm); err != nil {
		return err
	}

	// retrieve the types data to write
	data, err := generated.Types.ReadFile(typesFileName)
	if err != nil {
		return err
	}

	// read the first timestamp line of the old file (if exists) and compare it to the embedded one
	// (note: ignore errors to allow always overwriting the file if it is invalid)
	existingFile, err := os.Open(fullPath)
	if err == nil {
		timestamp := make([]byte, 13)
		io.ReadFull(existingFile, timestamp)
		existingFile.Close()

		if len(data) >= len(timestamp) && bytes.Equal(data[:13], timestamp) {
			return nil // nothing new to save
		}
	}

	return os.WriteFile(fullPath, data, 0644)
}

// prependToEmptyFile prepends the specified text to an empty file.
//