Sunbelt Computer Software

What Does Prepack Do?

You can learn the basics of what Prepack does and how it works from this overview.

It's not complete, but it can serve as a high-level overview while avoiding the computer science jargon.

Prepack CLI

Installation

npm install -g prepack

Compiling a File

Compile a file and print it to the console:

prepack script.js

Compile a file and output to another file:

prepack script.js --out script-processed.js

If you want to output a source map file add the --srcmapOut. If your bundle was generated from some other compiler, Prepack will automatically look for a .map file but you can also specify it using the --srcmapIn option:

prepack script.js --out script-processed.js --srcmapIn script.map --srcmapOut script-processed.map

For advanced uses see the API options or prepack --help.

prepack [ --out output.js ] [ --compatibility jsc ] [ --mathRandomSeed seedvalue ] [ --srcmapIn inputMap ] [ --srcmapOut outputMap ] [ -- | input.js ]

REPL

You can also run Prepack in REPL mode. This probably isn't very useful but it lets you test bugs in Prepack's interpreter.

prepack-repl

Prepack API

You can also use the programmatic API as a Node.js module.

Installation

npm install --save-dev prepack

var Prepack = require("prepack");
import { prepack, prepackFileSync } from 'prepack';
import * as Prepack from 'prepack';

String

Prepack.prepackSources([{filePath, fileContents, sourceMapContents}], options) // returns { code: string, map: SourceMap }

File Async

Prepack.prepackFile(filename, options, callback) // callback(error, { code: string, map: SourceMap })

File Sync

Prepack.prepackFileSync(filenames, options) // returns { code: string, map: SourceMap }

Options