Create an Emscripten filesystem image — file

Uses Emscripten's file_packager tool to build an Emscripten filesystem image that can be mounted by webR. The filesystem image may contain arbitrary data that will be made available for use by the WebAssembly R process once mounted.

Usage

file_packager(in_dir, out_dir = "./vfs", out_name = NULL, compress = FALSE)

Arguments

in_dir: Directory to be packaged into the filesystem image.
out_dir: Directory in which to write the output image files. Defaults to "./vfs".
out_name: A character string for the output image base filename. If NULL, defaults to the final component of the input directory path.
compress: Logical. If TRUE, a compressed version of the filesystem data is included in the output. Defaults to FALSE.

Details

Outputs at least two files (named by out_name) in the out_dir directory: a data file with extension ".data", and a metadata file with extension ".js.metadata". Both files should be hosted online so that their URL can be provided to webR for mounting on the Emscripten virtual filesystem.

When compress is TRUE, an additional file with extension ".data.gz" is also output containing a compressed version of the filesystem data. The metadata file is also changed to reflect the availability of a compressed version of the data.